Fittings, adapters, piping structures

Abstract

To provide a joint capable of causing drain water to satisfactorily flow from a vertical pipe to a horizontal pipe, an adapter, and a piping structure.SOLUTION: The present invention relates to a leg joint comprising: a first socket to which a lower connection pipe is coupled; a second socket to which a horizontal pipe is coupled; and a bent pipe part connecting the first socket and the second socket. The leg joint comprises a water screen cutting part 56 formed on a side where the second socket is disposed in a circumferential direction of the first socket, extending along a first pipe axis O1 of the first socket and protruding from an inner peripheral surface. The water screen cutting part 56 includes a pair of ribs 62. The pair of ribs 62 are disposed while being spaced from each other in a circumferential direction, and formed so as to enlarge or reduce an interval in the circumferential direction at an outer side of the pair of ribs toward a lower side and so as to protrude with respect to an inner peripheral surface of the lower connection pipe.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a joint, an adapter, and a piping structure capable of smoothly draining water from a vertical pipe to a horizontal pipe.

Background Art

[0002] Conventionally, when draining water falling from a vertical pipe to a horizontal pipe, a joint having a first connection portion to which the vertical pipe is connected, a second connection portion to which the horizontal pipe is connected, and a curved pipe portion connecting the first connection portion and the second connection portion has been widely used (for example, see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the joint of Patent Document 1, there is a problem that the drained water falling from the vertical pipe is likely to form a water film, and the drained water directly hitting the bottom of the joint is likely to bounce up and hinder good drainage.

[0005] The present invention has been made in view of such problems, and an object thereof is to provide a joint, an adapter, and a piping structure capable of smoothly draining water from a vertical pipe to a horizontal pipe.

Means for Solving the Problems

[0006] In order to solve the above problems, the present invention proposes the following means. (1) A first aspect of the present invention is a joint having a first connecting portion to which a vertical pipe is connected, a second connecting portion to which a horizontal pipe is connected, and a curved pipe portion connecting the first connecting portion and the second connecting portion, the joint comprising a water film cutting means, the water film cutting means comprising a pair of ribs formed on the side of the first connecting portion where the second connecting portion is located in the circumferential direction of the first connecting portion, extending along the first pipe axis of the first connecting portion and projecting inward from the inner circumferential surface, the pair of ribs being spaced apart from each other in the circumferential direction, the spacing between the outer circumferential sides of the pair of ribs expanding or contracting downwards, and being formed to project outward from the inner circumferential surface of the vertical pipe. (2) In the joint described in (1) above, the pair of ribs may be formed such that the projection height of the pair of ribs relative to the inner circumferential surface of the vertical pipe is 5 mm or more, and the circumferential width dimension when viewed along the first pipe axis is 5 mm or more.

[0007] The joint according to the present invention is equipped with a water film cutting means, which is formed on the side (downward) where the second connection portion is located in the circumferential direction of the first connection portion, is arranged with a circumferential gap around the first connection portion, the gap widens inward as it extends downward, the circumferential gap on the outer side of the pair of ribs widens or narrows as it extends downward, and is formed to protrude toward the inner circumferential surface of the vertical pipe. Therefore, the wastewater flowing down from the vertical pipe can be efficiently cut, and the water film formed in the flow path toward the second connection portion of the joint can be efficiently cut to create gaps. As a result, wastewater can flow smoothly from the vertical pipe to the horizontal pipe.

[0008] Here, the statement that the circumferential spacing between the outer sides of the pair of ribs increases as one moves downward means that when the first connection portion of the joint is unfolded around the first pipe axis, the spacing between the surfaces located on the outer sides of the pair of ribs gradually increases from top to bottom. In other words, the pair of ribs may be formed not only in the shape of the Japanese katakana character "ハ" (ha), but also by two mountain shapes arranged on the left and right, and can be arbitrarily set. Furthermore, the projection height relative to the inner surface of the vertical pipe refers to the maximum dimension of the projection extending inward from the inner surface of the vertical pipe. Furthermore, the circumferential width dimension when viewed along the pipe axis of the first connection refers, for example, to the circumferential width at the base end of the rib.

[0009] (3) In addition, the joint described in (1) or (2) above may be formed such that the pair of ribs are spaced apart on their opposing circumferentially inward sides, with the spacing increasing as it goes downward.

[0010] According to the joint of this invention, the pair of ribs are formed such that the distance between them on their circumferentially inward sides increases as they move downward. This allows the wastewater flowing down from the vertical pipe to be guided in a direction that separates the pair of ribs from each other in the circumferential direction, thereby more efficiently cutting the water film.

[0011] Here, the statement that the spacing between opposing circumferentially inward sides expands downward means that when unfolded around the first pipe axis, it forms a roughly inverted "ha" shape (like the Japanese katakana character "ハ"). For example, the vertical length, projection height, width dimension, left and right inclination angles, left and right rib thickness, and thickness distribution (change in rib thickness in the vertical direction) do not need to be symmetrical and may be set arbitrarily within a range that yields an effective result.

[0012] (4) In addition, the joint described in any one of the above items (1) to (3) may be formed such that the pair of ribs are offset to the side away from the first pipe axis when viewed from the base end side located on the inner circumferential surface side to the tip end side.

[0013] According to the joint of this invention, the pair of ribs are formed offset to the side away from the first pipe axis when viewed from the base end side located on the inner circumferential surface side to the tip side. This pushes the wastewater flowing down from the vertical pipe in a direction away from the first pipe axis (a direction away from the flow path toward the second connection part of the joint), thereby more efficiently cutting the water film.

[0014] (5) In addition, the joint described in any one of the above items (1) to (4) may have the pair of ribs formed in a flat plate shape.

[0015] According to the joint of this invention, since the pair of ribs are formed in a flat plate shape, the direction of the wastewater does not easily change as it flows along the surface of the pair of ribs, and the wastewater can be stably flowed in a predetermined direction.

[0016] (6) In addition, in the joint described in any one of the above items (1) to (5), the pair of ribs may have a main wall portion formed to a uniform thickness.

[0017] According to the joint of this invention, since the main wall portion of the pair of ribs is formed to a uniform thickness, the pair of ribs can be formed efficiently. Here, the main wall portion of a pair of ribs refers to the thickness of the main part of the rib excluding the outer peripheral edge of the pair of ribs, and specifically means that it does not include chamfers or corner radius shapes formed from any face of the rib toward the end face at the outer peripheral edge of the rib.

[0018] (7) A second aspect of the present invention is an adapter having a first connecting portion to which a vertical pipe is connected, a second connecting portion to which a horizontal pipe is connected, and a curved pipe portion connecting the first connecting portion and the second connecting portion, wherein the first connecting portion is a first socket of a joint body and is disposed between the first socket and the vertical pipe, and is disposed on the joint body to constitute the joint described in any one of the above items (1) to (6).

[0019] According to the adapter of this invention, the adapter is configured to constitute a joint as described in any one of the above items (1) to (6) by positioning the adapter between the first socket of the joint body, which has a first connection portion as the first socket, and the vertical pipe. Therefore, the joint can be easily constructed. Furthermore, since the adapter is manufactured separately from the joint body, the joint can be manufactured efficiently.

[0020] (8) A third aspect of the present invention is a piping structure comprising a joint described in any one of the above paragraphs (1) to (6), a vertical pipe connected to the first connection, and a horizontal pipe connected to the second connection.

[0021] According to the piping structure of the present invention, even if the diameter-expanded portion and the flow rectifying vanes are not formed in the lowermost joint (including the main pipe and the vertical pipe), the drainage can flow well through the horizontal pipe.

Effects of the Invention

[0022] According to the joint, adapter, and piping structure of the present invention, the drainage can flow well from the vertical pipe to the horizontal pipe.

Brief Description of the Drawings

[0023] [Figure 1] It is a longitudinal sectional view including a first pipe axis and a second pipe axis for explaining the schematic configuration of the piping structure according to the first embodiment of the present invention. [Figure 2] It is a front view seen along the second pipe axis for explaining the schematic configuration of the leg joint according to the first embodiment. [Figure 3] It is a longitudinal sectional view including a first pipe axis and a second pipe axis for explaining the schematic configuration of the leg joint according to the first embodiment. [Figure 4] It is a schematic configuration diagram obtained by enlarging the main part in FIG. 3 for explaining the schematic configuration of the leg joint according to the first embodiment. [Figure 5] It is a longitudinal sectional view including a pipe axis for explaining the schematic configuration of the adapter according to the first embodiment. <​​​​​​​​​​​​​​​This is a longitudinal cross-sectional view including a first pipe axis and a second pipe axis illustrating the schematic configuration of a leg joint according to a third embodiment of the present invention. [Figure 12] This is a longitudinal cross-sectional view including a first pipe axis and a second pipe axis illustrating the schematic configuration of a leg joint according to a fourth embodiment of the present invention. [Figure 13] This is a front view along the second pipe axis illustrating the schematic configuration of the leg joint according to the fifth embodiment of the present invention. [Figure 14] This is a longitudinal cross-sectional view including a first pipe axis and a second pipe axis illustrating the schematic configuration of a leg joint according to a fifth embodiment of the present invention. [Figure 15] This is a front view along the second pipe axis illustrating the schematic configuration of the leg joint according to the sixth embodiment of the present invention. [Figure 16] This is a longitudinal cross-sectional view including a first pipe axis and a second pipe axis illustrating the schematic configuration of a leg joint according to the sixth embodiment of the present invention. [Figure 17] This is a table illustrating examples of the present invention. [Modes for carrying out the invention]

[0024] <First Embodiment> The leg joint (connector) and drainage system (piping structure) according to the first embodiment of the present invention will be described below with reference to Figures 1 to 7. Figure 1 is a longitudinal cross-sectional view including the pipe axis illustrating the schematic configuration of the piping structure according to the first embodiment; Figure 2 is a front view along the second pipe axis illustrating the schematic configuration of the leg joint; Figure 3 is a longitudinal cross-sectional view including the first and second pipe axes; and Figure 4 is an enlarged schematic configuration diagram of the main parts in Figure 3 illustrating the schematic configuration of the leg joint. Furthermore, Figure 5 is a longitudinal cross-sectional view including the pipe axis illustrating the schematic configuration of the adapter according to the first embodiment; Figure 6 is a plan view along the first pipe axis; and Figure 7 is a perspective view illustrating the schematic configuration.

[0025] In Figures 1 to 7, reference numeral 1 indicates the drainage system (piping structure), reference numeral 100 indicates the leg joint (joint), reference numeral 20 indicates the leg joint body (joint body), reference numeral 50 indicates the adapter, reference numeral 110 indicates the central joint, reference numeral 114 indicates the lower connecting pipe (vertical pipe), reference numeral 120 indicates the horizontal pipe, reference numeral O1 indicates the first pipe axis, and reference numeral O2 indicates the second pipe axis.

[0026] First, with reference to Figure 1, the drainage system (piping structure) 1 according to the first embodiment will be described. Drainage system (piping structure) 1 is applicable, for example, to multi-story buildings such as high-rise apartments and commercial buildings. In drainage system (piping structure) 1, wastewater discharged from sanitary equipment (drainage facilities) such as toilets, vanity units, and sinks on each floor flows into a vertical main pipe (not shown) that constitutes the drainage channel via horizontal branch pipes (not shown).

[0027] As shown in Figure 1, the drainage system (piping structure) 1 comprises a manifold joint 110, a lower connecting pipe (vertical pipe: straight pipe) 114 connected to the lower vertical pipe connection part 111C of the manifold joint 110, a leg joint (connector) 100 having a leg joint body 20 that is roughly L-shaped in side view and connected to the lower end of the lower connecting pipe 114, and a horizontal main pipe (horizontal pipe) 120 that extends horizontally and is connected to the leg joint 100. In addition, a vertical main pipe (not shown) extending downward from the upper floor is connected to the upper vertical pipe connection part 111A of the manifold joint 110.

[0028] The vertical main pipe (first vertical pipe, not shown) is installed to pass through each floor (floor slab, not shown). Drainage from each drainage facility flows down along the vertical main pipe to the lowest floor of the multi-story building, and flows into the horizontal main pipe 120 via a manifold joint (pipe joint) 110 connected to the lower end of the vertical main pipe, a lower connecting pipe (vertical pipe: straight pipe) 114, and a leg joint 100, and is finally sent to the main sewer line or septic tank, etc. In this way, the drainage system 1 discharges the drainage from the drainage facilities on each floor to the outside of the building.

[0029] The vertical main pipe (first vertical pipe, not shown) collects drainage from the drainage facilities on each floor and guides it downwards. The vertical main pipe is equipped with multiple manifold fittings corresponding to each floor and a first pipe (not shown) that connects manifold fittings located on adjacent floors in the vertical direction.

[0030] As shown in Figure 1, among the multiple manifold joints, the lowest manifold joint 110, which is installed on the lowest floor of the building, has the lower connecting pipe (vertical pipe: straight pipe) 114, the leg joint 100, and the horizontal pipe 120 connected in this order according to the first embodiment.

[0031] The manifold joint 110 comprises a cylindrical joint pipe body 111, an upper vertical pipe connection portion 111A formed at the upper end of the joint pipe body 111, a plurality of branch pipe connection portions 111B (for example, three around the circumference) formed on the outer surface of the joint pipe body 111, and a lower vertical pipe connection portion 111C formed at the lower end.

[0032] Furthermore, in the first embodiment, as shown in Figure 1, the manifold 110 is an example in which, for example, the manifold pipe body 111 has well-known backflow prevention ribs 112 and swirling vanes 113 formed thereon. Furthermore, by applying the leg joint 100 according to the first embodiment, it is possible to ensure good drainage performance even if the backflow prevention rib 112, swirl vane 113, enlarged diameter section, etc. are not formed, and it is preferable not to form the backflow prevention rib 112, swirl vane 113, enlarged diameter section, etc. In other words, the drainage system (piping structure) 1 may be configured such that there are no protrusions (backflow prevention ribs, swivel vanes, etc.) inside the lowest floor joint, nor is there an enlarged diameter section.

[0033] The lower end of the vertical main pipe (first vertical pipe, not shown) is connected to the upper vertical pipe connection section 111A, for example, via an adapter 115, and the lower connecting pipe (vertical pipe) 114 is connected to the lower vertical pipe connection section 111C.

[0034] Furthermore, horizontal branch pipes (not shown) are connected to each branch pipe connection section 111B, and the wastewater discharged from the drainage facility is guided into the interior of the joint pipe body 111 via the branch pipe connection section 111B.

[0035] The lower connecting pipe (vertical pipe: straight pipe) 114 is connected, for example, to a first socket (first connection part) 201 formed at the upper end of the leg joint 100. Furthermore, the horizontal main pipe (horizontal pipe) 120 is connected to the second socket (second connection part) 202 of the leg joint 100, so that the wastewater flowing in from the lower connecting pipe (vertical pipe) 114 is discharged to the outside via the horizontal main pipe (horizontal pipe) 120.

[0036] The lower connecting pipe (vertical pipe) 114 is formed from a resin composition containing, for example, a polyvinyl chloride resin and thermally expandable graphite, which is a thermally expandable refractory material. Specifically, the lower connecting pipe 114 is formed by extruding a resin composition containing a thermally expandable refractory material. By providing these heat-expandable fire-resistant materials, fire resistance can be achieved when the lower connecting pipe 114 is inserted through the through-hole provided in the floor slab.

[0037] 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 (vertical pipe) 114 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 (vertical pipe) 114.

[0038] The horizontal main pipe 120 guides the wastewater that flows down from the lower connecting pipe (vertical pipe) 114 horizontally and discharges it to a septic tank or the main sewer pipe outside the premises. A support leg 23 is formed on the bottom side of the leg joint 100, and this support leg 23 is supported by a support fitting (not shown) or the like.

[0039] The lateral branch pipe connection portion 111B extends radially outward from the circumferential wall of the joint pipe body 111, for example. In this embodiment, three lateral branch pipe connection portions 111B are formed. Of the three lateral branch pipe connections 111B, two are positioned separately on either side of the pipe axis O of the joint pipe body 111. The remaining lateral branch pipe connection 111B extends in a direction that forms a 90° angle in the circumferential direction with the direction in which each of the other lateral branch pipe connections 111B extends when viewed along the pipe axis O.

[0040] The number and direction of extension of the lateral branch pipe connections 111B are not limited to the above example and can be set arbitrarily. In the example shown, lateral branch pipes (not shown) are individually connected to the lateral branch pipe connections 111B, but some of the lateral branch pipe connections 111B may be closed off with closing members such as bushings as needed.

[0041] The joint pipe body 111 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. Specifically, the joint pipe body 111 is formed, for example, by injection filling of the polyvinyl chloride resin composition into the cavity of a molding machine.

[0042] The manifold joint 110 has a cylindrical adapter 115 attached to the vertical pipe connection portion 111A at the upper end of the joint pipe body 111 to which the lower end of the vertical main pipe (not shown) is connected. A vertical packing 116 is fitted around the inner circumference of the adapter 115, and an end treatment member 117 is fitted to the upper end of the adapter 115.

[0043] The end treatment member 117 has a ring shape that fits onto the upper end of the adapter 115, and has a through hole 117A through which the lower end of the vertical main pipe (not shown) can be inserted. An engaging projection 115a is formed on the upper end of the outer circumferential surface of the adapter 115, extending along its circumferential direction with a predetermined thickness. The end treatment member 117 is fitted onto the upper end of the adapter 115 by fitting the ring-shaped end treatment member 117 so as to surround the outer circumference of this engaging projection 115a.

[0044] The vertical packing 116 has a cylindrical body 116a fitted inside the adapter 115, and a lip portion 116b that protrudes from the inner circumferential surface of the cylindrical body 116a. The vertical packing 116 is made of a rubber material commonly used in drainage equipment, such as ethylene-propylene-diene rubber (EPDM), and is a packing in which a lip portion 116b 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 (not shown).

[0045] Furthermore, an inner circumferential step portion 116c is formed at the lower end of the cylindrical body 116a, which narrows the inner diameter of the lower end of the cylindrical body 116a. This inner circumferential step portion 116c functions as a stopper for the vertical main pipe (not shown) when the lower end of the vertical main pipe (not shown) is inserted into the vertical packing 116.

[0046] The adapter 115 has a fitting portion 115b at the lower part of its outer periphery wall. This fitting portion 115b has a smaller diameter than the upper part 115c of the outer periphery wall of the adapter 115, and the adapter 115 can be fitted into the vertical pipe connection portion 111A of the joint pipe body 111 by inserting the fitting portion 115b into the vertical pipe connection portion 111A on the upper side of the joint pipe body 111. An inward-facing ring-shaped inner flange 115d is formed on the lower end side of the fitting portion 115b in the inner circumference of the adapter 115.

[0047] In this embodiment, the overhang length of the inner flange 115d (the length of the protrusion of the inner flange 115d along the radial direction toward the axis of the cylindrical fitting portion 115b from the inner surface of the fitting portion 115b) is set to an overhang length that can support the inner stepped portion 116c provided on the vertical packing 116. Therefore, the inner diameter of the inner flange 115d is approximately the same as the inner diameter of the inner stepped portion 116c in the vertical packing 116, and is approximately the same as the inner diameter of the lower end of the vertical main pipe (not shown) inserted into the vertical packing 116.

[0048] The inner flange 115d introduces the drainage flow that flows from the vertical main pipe (not shown) through the adapter 115 and the vertical pipe connection part 111A into the joint pipe body 111, while narrowing it along the inner edge of the inner flange 115d. The drainage flow that flows into the joint pipe body 111 due to the flow of the drainage flow passing through the inner edge of the inner flange 115d flows downward in a cylindrical shape.

[0049] As shown in Figures 2 and 3, the leg joint (joint) 100 comprises, for example, a leg joint body (joint body) 20 and an adapter 50. The leg joint body (joint body) 20 comprises a first socket (first connection part) 201, a second socket (second connection part) 202, and a curved pipe section 21. The following description will use as an example the arrangement of the leg joint 100 when the lower connecting pipe (vertical pipe) 114 is connected to the first socket 201 and the horizontal pipe 120 is connected to the second socket 202, but the arrangement of the leg joint 100 is not limited to this. The material forming the leg joint body (joint body) 20 and the adapter 50 can be arbitrarily set, and for example, they may be formed from a transparent material.

[0050] The first socket 201 is formed in a cylindrical shape. Furthermore, the first socket 201 is positioned so that its first pipe axis O1 is aligned with the vertical direction. Here, "aligned with the vertical direction" means, for example, that the acute angle between the first pipe axis O1 and the vertical direction is 5 degrees or less, or that the first pipe axis O1 and the vertical direction are parallel. The same applies to the second connecting wire 22a, which will be described later, being aligned with the second pipe axis O2. The inner diameter of the first socket 201 is larger than the outer diameter of the lower connecting pipe (vertical pipe) 114. The lower connecting pipe (vertical pipe) 114 is arranged along the vertical direction. The lower end of the lower connecting pipe 114 is located inside the first socket 201.

[0051] The second socket 202 is formed in a cylindrical shape. The second socket 202 is positioned such that its second pipe axis O2 is aligned with the horizontal plane. The second socket 202 may also be positioned at an angle to the horizontal plane such that the horizontal pipe 120 has a water slope. Furthermore, the second pipe axis O2 is positioned to intersect with the first pipe axis O1.

[0052] The inner diameter of the second socket 202 and the outer diameter of the horizontal pipe 120 are formed to be approximately equal in diameter. The end of the horizontal pipe 120 is positioned in the second socket 202. The horizontal pipe 120 is positioned along the horizontal direction. Placing a sealing member between the first socket 201 and the lower connecting pipe (vertical pipe) 114 is preferable for preventing drainage from leaking to the outside from between the first socket 201 and the lower connecting pipe (vertical pipe) 114. The same applies between the second socket 202 and the horizontal pipe 120.

[0053] The curved pipe section 21 is connected to the first socket 201 and the second socket 202, respectively. The curved pipe section 21 is curved so as to protrude diagonally downward. Hereinafter, the direction in which the curved pipe section 21 protrudes will be referred to as the convex side D1, and the direction opposite to the convex side D1 will be referred to as the concave side D2.

[0054] The curved pipe section 21 is, for example, shaped like a curved pipe that changes the direction of the drainage flow by approximately 90 degrees. The curved pipe section 21 is a first connecting line 21a that, in a cross-sectional view including the first pipe axis O1 and the second pipe axis O2, is curved such that the inner circumferential surface of the convex side D1 is convex toward the convex side D1. For example, in the cross-section in the plane formed by the first pipe axis O1 and the second pipe axis O2 shown in Figure 3, the central angle θ0 of the arc formed by the first connecting line 21a is set to less than 90 degrees.

[0055] The first end 21a1 of the first connecting wire 21a (the end on the first socket 201 side) is connected to the inner circumferential surface of the first socket 201. Preferably, the first end 21a1 of the first connecting wire 21a extends along the first pipe axis O1 of the first socket 201. Furthermore, the first end 21a1 has a circular opening, and its central axis is parallel to the first pipe axis O1.

[0056] The second end 21a2 of the first connecting line 21a, which is the end opposite to the first end 21a1 (the tangent S1 at the end of the second end 21a2 of the first connecting line 21a), is inclined with respect to the horizontal plane. As the first connecting line 21a moves from the first end 21a1 to the second end 21a2, it continuously changes direction from being along the first pipe axis O1 to being perpendicular to the horizontal plane. The tangent S1 is inclined to gradually move downward as it moves towards the second socket 202.

[0057] The inner circumferential surface 21b of the concave side D2 in the curved pipe section 21 is formed in a curved shape that is convex toward the convex side D1. The inner diameter of the portion of the curved pipe section 21 corresponding to the first end 21a1 of the first connecting wire 21a is smaller than the inner diameter of the first socket 201. The curved pipe section 21 is coaxially connected to the first socket 201. The curved pipe section 21 and the first socket 201 are connected via a stepped portion 201A.

[0058] The tubular body 22 is formed in a straight tube shape and is arranged along a horizontal plane. The inner circumferential surface of the convex side D1 of the tubular body 22 is a straight (flat) second connecting line 22a in a cross-sectional view including the first pipe axis O1 and the second pipe axis O2. The second connecting line 22a runs along the second pipe axis O2 of the second socket 202. The second connecting line 22a and the first connecting line 21a of the curved pipe section 21 constitute the first inner circumferential surface 20a of the curved pipe section 21. The second connecting line 22a is connected to the second end 21a2 of the first connecting line 21a and the inner circumferential surface of the second socket 202, respectively. The first connecting line 21a (tangent line S1) and the second connecting line 22a are connected to the concave side D2 at an obtuse angle θ1 (hereinafter also referred to as obtuse angle θ1). An obtuse angle is an angle less than 180 degrees. In a cross-sectional view including the first pipe axis O1 and the second pipe axis O2, the leg joint 100 has a connection point between the first connecting line 21a and the second connecting line 22a located below the end on the first socket 201 side of the inner circumferential surface 21b of the curved pipe section 21.

[0059] The inner circumferential surface 22b of the concave side D2 of the curved pipe section 21 is straight. The inner circumferential surface 22b and the inner circumferential surface 21b of the curved pipe section 21 constitute the second inner circumferential surface 20b of the concave side D2 of the curved pipe section 21. The inner diameter of the curved pipe section 21 is smaller than the inner diameter of the second socket 202. The curved pipe section 21 is coaxially connected to the second socket 202. A stepped portion is formed on the inner circumferential surface of the connection portion between the curved pipe section 21 and the second socket 202, extending around the entire inner circumference of the second socket 202. This stepped portion locks the horizontal pipe 120 in the direction of the pipe axis O2.

[0060] The leg body 23 is formed, for example, in the shape of a truncated cone. The leg body 23 is positioned such that its axis aligns with the first pipe axis O1 of the first socket 201. The upper end of the leg body 23 is fixed to the outer circumferential surface of the convex side D1 of the curved pipe section 21. The lower end of the leg body 23 and the lower end of the second socket 202 are positioned at the same height relative to each other in the vertical direction.

[0061] The curved pipe section 21, the first socket 201, and the second socket 202 that constitute the leg joint body 20 are integrally formed, for example, by injection molding using a resin material.

[0062] In this embodiment, the first socket 201 of the leg joint 100 and the lower connecting pipe (vertical pipe) 114 are connected by an adapter 50. The adapter 50 is formed in an annular shape and is positioned coaxially with the first socket 201 between the first socket 201 and the lower connecting pipe (vertical pipe) 114. The adapter 50 adjusts the diameter difference between the first socket 201 and the lower connecting pipe (vertical pipe) 114. In the following, the radial direction of the adapter 50 will simply be referred to as the radial direction, and the circumferential direction of the adapter 50 will simply be referred to as the circumferential direction.

[0063] As shown in Figure 3, the adapter 50 includes, for example, an adapter body 51, an elastic ring 52, and a fixing member 53. As shown in Figures 4 to 7, the adapter body 51 includes, for example, a main body 55 and a water film cutting section (water film cutting means) 56. As shown in Figure 4, the main body 55 is positioned inside the first receiving opening 201, and its lower surface is supported by the stepped portion 201A. A lower connecting pipe (vertical pipe) 114 is located inside the main body 55. As shown in Figure 4, the main body 55 comprises a ring portion 57 and a first cylindrical portion 58.

[0064] Of the adapter 50, the components other than the elastic ring 52 may be made of polyvinyl chloride resin, or of a resin such as polyvinyl chloride, and it is particularly preferable to use a resin with excellent impact resistance. Examples of resins with excellent impact resistance include, for example, vinyl chloride resins such as (1) a resin obtained by mixing a polyvinyl chloride polymer with an impact-improving resin, (2) a resin obtained by graft copolymerizing a polyvinyl chloride polymer with an impact-improving resin, (3) a copolymer of a vinyl chloride monomer and a monomer having an unsaturated bond that can copolymerize with the vinyl chloride monomer, and (4) a graft copolymer obtained by graft copolymerizing vinyl chloride with a (co)polymer other than vinyl chloride. These (1) to (4) may be used individually or in combination of two or more. Furthermore, the above polyvinyl chloride resins may be chlorinated as needed.

[0065] Examples of impact-improving resins to be mixed with polyvinyl chloride polymers in (1) above, and impact-improving resins to be graft copolymerized with polyvinyl chloride polymers in (2) above, include resins having rubber properties. Specifically, examples include acrylonitrile-butadiene-styrene copolymer, methyl methacrylate-butadiene-styrene copolymer, acrylic rubber, chlorinated polyethylene, ethylene-vinyl acetate copolymer resin, and acrylonitrile-butadiene copolymer. These may be used individually or in combination of two or more.

[0066] By using a polyvinyl chloride-based resin obtained by mixing or graft copolymerizing resins having the above-mentioned rubber properties, the impact resistance of the polyvinyl chloride-based resin can be improved. The adapter 50 has a complex structure and is susceptible to damage. However, by using a resin with excellent impact resistance for the adapter 50, it is possible to prevent damage to the adapter 50 in cases such as when the leg joint body 20 and the adapter 50 are accidentally dropped.

[0067] The ring portion 57 is fitted (interlocked) into the first socket 201. As shown in Figure 3, the axis of the inner opening 57a of the ring portion 57 is offset to the convex side D1 in a direction perpendicular to the first pipe axis O1 of the first socket 201. The opening 57a is eccentric with respect to the first socket 201. As shown in Figure 4, the ring portion 57 comprises a thick-walled portion 59 and a thin-walled portion 60.

[0068] The thick-walled portion 59 is the outer circumference of the ring portion 57, and the thin-walled portion 60 is the inner circumference of the ring portion 57. The thick-walled portion 59 and the thin-walled portion 60 are arranged continuously in the radial direction. The thickness of the thin-walled portion 60 (thickness along the axial direction of the adapter 50) is thinner than the thickness of the thick-walled portion 59. The upper surface of the thin-walled portion 60 is connected to the upper surface of the thick-walled portion 59 via a step. The lower surface of the thin-walled portion 60 is smoothly connected to the lower surface of the thick-walled portion 59 without any step.

[0069] As shown in Figure 4, the first cylindrical portion 58 extends upward from the ring portion 57. The first cylindrical portion 58 is positioned on the inner circumferential edge of the thick-walled portion 59. The first cylindrical portion 58 is positioned coaxially with the opening 57a of the ring portion 57. A projection 61 is provided on the outer circumferential surface of the first cylindrical portion 58. The projection 61 is provided at the upper end of the first cylindrical portion 58. The projection 61 is provided continuously around the entire circumference in the circumferential direction.

[0070] As shown in Figures 1 and 3, the water film cutting section (water film cutting means) 56 is formed on the side of the ring section 57 in the circumferential direction where the second socket (second connection part) 202 of the leg joint 100 is located. In other words, when viewed along the first pipe axis O1, it is formed on the side of the ring section 57 in the circumferential direction where the second socket (second connection part) 202 of the leg joint 100 is located. Furthermore, the ring portion 57 is formed with a positioning means (not shown) in which one side is a projection and the other side is a recess, for setting the circumferential position of the first socket 201 of the leg joint 100.

[0071] Furthermore, in this embodiment, the water film cutting section (water film cutting means) 56, as shown in Figures 1, 3, 5 to 7, includes, for example, a pair of ribs 62 and a plate section 63 that supports the base ends of the pair of ribs 62. Furthermore, whether or not the water film cutting section (water film cutting means) 56 includes a plate section 63 may be set arbitrarily.

[0072] In this embodiment, as shown in Figure 3, the inner surface of the plate portion 63 (the surface on the first pipe axis O1 side) is formed in an arc shape that is coaxial with and has the same diameter as the inner circumferential surface of the opening 57a of the ring portion 57. Therefore, the inner surface of the plate portion 63 is configured to be flush with the inner circumferential surface of the curved pipe portion 21 of the leg joint body (joint body) 20 and the inner circumferential surface of the lower connecting pipe (vertical pipe) 114. Furthermore, the upper end of the plate portion 63 is connected to the lower surface of the ring portion 57, and the plate portion 63 is formed to extend inward into the curved pipe portion 21 in the direction of the first pipe axis O1.

[0073] The pair of ribs 62 are supported at their base ends by the inner circumferential surface of the plate portion 63, and their tip ends are formed to protrude toward the inner circumferential side (radially inward) of the curved pipe portion 21. Furthermore, the pair of ribs 62 are formed to extend inward (downward) from the curved pipe section 21 in the direction of the first pipe axis O1.

[0074] Furthermore, the pair of ribs 62 are formed symmetrically with respect to the plane containing the first pipe axis O1, and are formed in a shape roughly resembling the Japanese katakana character "ハ" (ha). Various dimensions, including the circumferential width dimension L1, the protruding height L2, and the rib thickness, are formed to be the same for both ribs. Furthermore, the pair of ribs 62 are formed offset from the first pipe axis O1 when viewed from the base end towards the tip end. Specifically, the pair of ribs 62 extend toward the side away from the first pipe axis O1.

[0075] The upper ends of the base ends of a pair of ribs 62 are spaced apart from each other in the circumferential direction of the inner surface of the opening 57a of the ring portion 57. Specifically, for example, the spacing L3 (the narrowest distance between the ribs 62) at the base ends of the upper ends of a pair of ribs 62 is formed to be 30 mm. The spacing between a pair of ribs 62 in the circumferential direction of the inner surface of the opening 57a can be set arbitrarily. When viewed from the pipe axis O1, it is preferable that the ribs 62 are on the side of the horizontal main pipe 120 (range 120S shown in Figure 6) than the first straight line. The first straight line is a straight line that, when viewed from the pipe axis O1, passes through the pipe axis O1 of the first socket 201 (vertical main pipe, vertical pipe) and is perpendicular to the pipe axis of the horizontal main pipe 120.

[0076] Furthermore, the pair of ribs 62 are formed such that the spacing between the outer and inner surfaces of the ribs 62 gradually increases as they extend downward in the direction of the first pipe axis O1. Specifically, the pair of ribs 62 are formed to open at an angle of 30° with respect to the plane containing the first pipe axis O1. The spacing between the opposing inner sides of the pair of ribs 62 is maintained. The angles of the pair of ribs 62 with respect to the plane containing the first pipe axis O1 may be different, but it is preferable that they be the same. Furthermore, the pair of ribs 62 may be formed such that the distance between them on the outer and inner surfaces gradually decreases (shrinks) as they extend downward in the direction of the first pipe axis O1, and they may be formed to close at an angle of 30° with respect to the plane containing the first pipe axis O1. In other words, the pair of ribs 62 may be in a roughly inverted V shape.

[0077] Each rib 62 is formed in a flat plate shape, for example, with its upper and lower surfaces parallel to each other in the direction of the first pipe axis O1. The main wall portions of a pair of ribs 62 are formed to have a constant thickness. Here, the main wall portion of a pair of ribs 62 refers to the thickness of the main part of the rib, and specifically means that it does not include chamfered portions or corner radius shapes formed from any face of the rib toward the end face at the outer peripheral edge of the rib.

[0078] Furthermore, the rib 62 is formed such that, for example, its circumferential width dimension L1 is 19 mm when viewed along the first pipe axis O1, and its protruding height L2 is 17 mm. Furthermore, the pair of ribs 62 are formed to have a length of 39 mm along the direction of the first pipe axis O1. The circumferential width dimension L1 of the rib 62 is set within the range of 5 mm to 40 mm, and preferably within the range of 10 mm to 30 mm. The protruding height L2 of the rib 62 is set within the range of 5m to 60mm, and preferably within the range of 10mm to 50mm. The circumferential width dimension L1 and projection height L2 of a pair of ribs 62 may be different from each other, but it is preferable that they be the same.

[0079] Furthermore, the rib 62 is formed in a curved shape that protrudes upward, with the protruding height gradually increasing from top to bottom when viewed from a direction perpendicular to the surface of the rib 62, and is formed so that the maximum protruding height occurs midway along the first pipe axis O1 direction. In addition, a corner radius R is formed radially inward at the lower end of the rib 62.

[0080] As shown in Figure 4, the elastic ring 52 is formed of an elastic material such as rubber. The elastic ring 52 is placed inside the main body 55. The lower connecting pipe (vertical pipe) 114 is fitted inside the elastic ring 52. The elastic ring 52 comprises a main ring 64, a first protrusion 65, and a second protrusion 66. The main ring 64 is tightly fitted inside the first cylindrical portion 58. The inner diameter of the main ring 64 is larger than the inner diameter of the ring portion 57 (the diameter of the opening 57a).

[0081] The first protrusion 65 and the second protrusion 66 are provided on the inner circumferential surface of the main ring 64. The first protrusion 65 and the second protrusion 66 are provided continuously over the entire circumference in the circumferential direction. The first protrusion 65 is provided at the lower end of the main ring 64. The inner diameter of the first protrusion 65 is the same as the inner diameter of the ring portion 57. The first protrusion 65 is supported from below by the ring portion 57. The lower end surface of the lower connecting pipe (vertical pipe) 114 abuts against the upper surface of the first protrusion 65.

[0082] The second protrusion 66 is provided at the upper end of the main ring 64. The second protrusion 66 extends downward as it moves radially inward. The inner diameter of the second protrusion 66 is smaller than the outer diameter of the lower connecting pipe (vertical pipe) 114. The lower connecting pipe (vertical pipe) 114, inserted into the elastic ring 52, causes the second protrusion 66 to be elastically deformed downward and radially outward. As a result, the second protrusion 66 makes close contact (pressure contact) with the entire circumference of the lower connecting pipe (vertical pipe) 114, ensuring a seal between the elastic ring 52 and the lower connecting pipe (vertical pipe) 114.

[0083] The fixing member 53 is attached to the main body 55 and restricts the elastic ring 52 from detaching from the main body 55. The fixing member 53 is positioned inside the first socket 201 of the leg joint 100. The fixing member 53 comprises a second cylindrical portion 67 and a flange portion 68.

[0084] The second cylindrical portion 67 is fitted (interlocked) into the first cylindrical portion 58 from the radially inner side. In this embodiment, the second cylindrical portion 67 is positioned between the first cylindrical portion 58 and the first socket 201. The second cylindrical portion 67 is fitted (interlocked) into the first socket 201. The lower end surface of the second cylindrical portion 67 is spaced upward from the upper surface of the thickened portion 59.

[0085] The flange portion 68 protrudes radially inward from the upper end of the second cylindrical portion 67. The flange portion 68 covers the first cylindrical portion 58 and the main body ring 64 from above. The lower surface of the flange portion 68 abuts against the upper end surfaces of the first cylindrical portion 58 and the main body ring 64, respectively. Furthermore, the adapter 50 (especially the adapter body 51 and the fixing member 53) may be transparent for the sake of visibility.

[0086] In this embodiment, the leg joint 100 is used by flowing drainage W downwards from the lower connecting pipe (vertical pipe) 114 side to the leg joint 100. On the first inner circumferential surface 20a, where the drainage W flowing from the lower connecting pipe (vertical pipe) 114 to the curved pipe section 21 strikes, the first connecting line 21a and the second connecting line 22a are connected at an obtuse angle θ1. Therefore, compared to the convex inner circumferential surface of the bend section in Patent Document 1, the acute angle θ2 between the vertical direction and the first connecting line 21a is smaller (the first connecting line 21a is positioned to align with the vertical direction).

[0087] Therefore, when the downward-flowing drainage W hits the first connecting line 21a of the curved pipe section 21, the force it receives from the curved pipe section 21 is relatively small, and the splashing up when the drainage W hits the curved pipe section 21 can be suppressed. Furthermore, the vertical length of the leg joint body 20 is relatively short, which improves the fit of the leg joint body 20.

[0088] The first end 21a1 of the first connecting wire 21a extends along the first pipe axis O1 of the first socket 201. Therefore, the angle between the first end 21a1 of the first connecting wire 21a and the vertical direction becomes smaller than the angle between the second end 21a2 of the first connecting wire 21a and the vertical direction. As a result, the force that the downward-flowing drainage W receives from the curved pipe section 21 when it hits the first end 21a1 of the first connecting wire 21a becomes smaller, and the upward bounce of the drainage W when it hits the curved pipe section 21 can be further suppressed.

[0089] The leg joint body 20 is equipped with a curved pipe section 21. Therefore, when the leg joint body 20 is formed by injection molding using a mold, when removing the leg joint body 20 from the core forming the second socket 202 in the mold, it will retract along the second connection line 22a of the tubular body 22. Therefore, the core forming the second socket 202 can be used to form the second connecting line 22a of the curved pipe section 21. Since the lower surface of the curved pipe section 21 is a flat second connecting line 22a, the volume of space inside the leg joint body 20, that is, the passage for air when the drainage W flows inside the leg joint body 20 can be secured.

[0090] According to the leg joint 100 and drainage system (piping structure) 1 of the first embodiment, a pair of ribs 62 are arranged with their upper ends spaced apart from each other in the circumferential direction, and the spacing between them in the circumferential direction increases as they move downward (towards the bottom), providing a water film cutting section 56. This allows for efficient cutting of the water film in the drainage water flowing down from the lower connecting pipe (vertical pipe) 114, thereby creating gaps in the water film. Consequently, it is possible to suppress the rise of the inside of the leg joint 100. As a result, even if the vertical pipe (including the centralized piping) does not have an enlarged diameter section or flow straightening vanes, the drainage from the lower connecting pipe (vertical pipe) 114 can be smoothly flowed into the horizontal pipe 120.

[0091] Furthermore, with the leg joint 100, the pair of ribs 62 are formed offset to the side that is separated from each other by the first pipe axis O1 when viewed from the base end side to the tip end side. Therefore, the wastewater flowing down from the lower connecting pipe (vertical pipe) 114 can be efficiently directed in the direction away from the first pipe axis O1 (away from the flow path toward the second receiving end 201 side of the leg joint 100).

[0092] Furthermore, with the leg joint 100, since the pair of ribs 62 are formed in a flat plate shape, the wastewater that flows down can flow stably in a predetermined direction as it flows along the surface of the pair of ribs.

[0093] Furthermore, since the leg joint 100 has a pair of ribs 62 formed to a uniform thickness, it can be formed efficiently. Furthermore, the leg joint 100 comprises a joint body 20 whose first connection portion is a first socket 201, and an adapter 50 that is attached to the first socket 201. Since the pair of ribs 62 are formed on the inner circumferential surface of the adapter 50, the leg joint 100 can be easily constructed.

[0094] <Second Embodiment> The leg joint (connector) and drainage system (piping structure) according to the second embodiment of the present invention will be described below with reference to Figures 8 to 10. Figure 8 is a longitudinal cross-sectional view including the pipe axis illustrating the schematic configuration of the piping structure according to the second embodiment; Figure 9 is a front view along the second pipe axis illustrating the schematic configuration of the leg joint; and Figure 10 is a longitudinal cross-sectional view including the first and second pipe axes.

[0095] In Figures 8 to 10, reference numeral 1A indicates the drainage system (piping structure), reference numeral 200 indicates the leg joint (joint), reference numeral 20A indicates the leg joint body (joint body), reference numeral 21A indicates the curved pipe section, reference numeral 110A indicates the central joint, and reference numeral 114 indicates the lower connecting pipe (vertical pipe).

[0096] As shown in Figure 8, the drainage system (piping structure) 1A includes, for example, a manifold joint 110A, a lower connecting pipe (vertical pipe: straight pipe) 114 connected to the lower vertical pipe connection part 111C of the manifold joint 110A, a leg joint 200 having a leg joint body 20A connected to the lower end side of the lower connecting pipe 114 and formed in a roughly L-shape when viewed from the side, and a horizontal main pipe (horizontal pipe) 120 connected to the leg joint 200. In addition, a vertical main pipe (not shown) extending downward from the upper floor is connected to the upper vertical pipe connection part 111A of the manifold joint 110. In other words, the drainage system (piping structure) 1A is configured to include a manifold joint 110A and a leg joint 200, instead of the manifold joint 110 and leg joint 100 of the drainage system 1 according to the first embodiment.

[0097] Then, the wastewater from each drainage system flows down along the vertical main pipe (first vertical pipe, not shown) to the lowest floor of the multi-story building, and flows into the horizontal main pipe 120 via the manifold joint (pipe joint) 110A, the lower connecting pipe (vertical pipe: straight pipe) 114, and the leg joint 200, and the wastewater is discharged to the outside of the building.

[0098] Of the multiple manifold joints, as shown in Figure 8, the lowest manifold joint 110, which is located on the lowest floor of the building, has the lower connecting pipe (vertical pipe: straight pipe) 114, the leg joint 200, and the horizontal pipe 120 connected in this order according to the second embodiment.

[0099] The manifold joint 110A comprises a cylindrical joint pipe body 111, an upper vertical pipe connection portion 111A formed at the upper end of the joint pipe body 111, a plurality of branch pipe connection portions 111B formed on the outer circumferential surface of the joint pipe body 111, and a lower vertical pipe connection portion 111C formed at the lower end. In other words, the manifold 110 according to the first embodiment does not have ribs with inclined portions, such as the backflow prevention rib 112 and the swivel vane 113.

[0100] Furthermore, the lower connecting pipe (vertical pipe) 114 is also configured without ribs or enlarged diameter sections such as the swivel vanes mentioned above. In other words, the lowest floor joint has no enlarged diameter sections or ribs at all, and the lower connecting pipe 114, which is made of a pipe without protrusions, is connected to the leg joint 200. It is preferable to have a similar configuration for the leg joint 100 and the leg joint according to the embodiment described later.

[0101] The manifold joint 110A differs from the manifold joint 110 in that it does not have a backflow prevention rib 112 and a swivel vane 113. The upper vertical pipe connection part 111A, the branch pipe connection part 111B, and the lower vertical pipe connection part 111C are the same as in the first embodiment, so the same reference numerals are used and their description is omitted. The adapter 115, vertical packing 116, end treatment member 117, lower connecting pipe (vertical pipe) 114, and horizontal main pipe 120 attached to the manifold joint 110A are also the same as in the first embodiment, so their description is omitted.

[0102] As shown in Figures 8 to 10, the leg joint (connector) 200 comprises, for example, a leg joint body (connector body) 20A and an adapter 50. The leg joint body (joint body) 20A comprises a first socket (first connection part) 201, a second socket (second connection part) 202, a curved pipe section 21A, and a leg body 23.

[0103] The curved pipe section 21A is configured such that the curved pipe section 21 relating to the leg joint body 20 according to the first embodiment is equipped with, for example, two (or more) cleaning openings 30 on the side surface of the curved pipe section 21. For example, one cleaning opening 30 is located in each curved portion of the side surface of the curved pipe section 21A, symmetrically positioned to the plane including the first pipe axis O1 and the second pipe axis.

[0104] The opening 30 includes, for example, a circular cleaning hole 31 that penetrates from the outside to the inside of the curved pipe section 21A, and a circular cover member 32 that seals the cleaning hole 31. Furthermore, the cleaning hole 31 has a female thread (not shown) formed on its inner circumference, and the lid member 32 has a male thread (not shown) formed on its outer circumference. By engaging the male thread of the lid member 32 with the female thread of the cleaning hole 31 and screwing it in, the cleaning hole 31 can be sealed. Furthermore, the lid member 32 has a tool groove 33 formed therein for engaging a tool when screwing it into the cleaning hole 31, for example.

[0105] The number of cleaning openings 30 can be set arbitrarily; there may be just one, or there may be three or more cleaning openings 30. Furthermore, the position where the cleaning opening 30 is formed can be arbitrarily set, and it may be formed on the convex side D1, the concave side D2, etc., of the curved pipe section 21A, in addition to or instead of the side surface. Other aspects are the same as in the first embodiment, so the same reference numerals are used and their explanation is omitted.

[0106] According to drainage system (piping structure) 1A, good drainage performance can be ensured even without providing protrusions (backflow prevention ribs, swivel vanes, etc.) in the lowest floor joint, nor with any enlarged diameter sections.

[0107] Furthermore, according to the drainage system (piping structure) 1A, the leg joint (connector) 200 is equipped with a cleaning opening 30, allowing for easy and efficient cleaning of the inside of the leg joint (connector) 200.

[0108] <Third Embodiment> The leg joint according to the third embodiment of the present invention will be described below with reference to Figure 11. Figure 11 is a longitudinal cross-sectional view including a first pipe axis and a second pipe axis illustrating the schematic configuration of the leg joint according to the third embodiment. In Figure 11, reference numeral 300 denotes the leg joint (joint), and reference numeral 20B denotes the leg joint body (joint body).

[0109] As shown in Figure 11, the leg joint (connector) 300 according to the third embodiment includes, for example, a leg joint body (connector body) 20B and an adapter 50. The difference between the leg joint (connector) 300 and the leg joint (connector) 100 according to the first embodiment is that the leg joint body (connector body) 20B is provided instead of the leg joint body (connector body) 20. Other parts are the same as in the first embodiment, so the same reference numerals are used and their description is omitted.

[0110] As shown in Figure 11, the leg joint 300 has, for example, an inner circumferential surface 21bA of the curved pipe section 21B (the end of the second inner circumferential surface 20bA on the first socket 201 side) that extends along the first pipe axis O1.

[0111] With this configuration, when the leg joint 300 is formed, for example, by injection molding using a mold, the direction in which the leg joint 300 is removed from the core forming the first socket 201 in the mold is aligned with the inner circumferential surface 21bA of the curved pipe section 21B. Therefore, the inner circumferential surface 21bA of the curved pipe section 21B can be formed using the core forming the first socket 201.

[0112] <Fourth Embodiment> The leg joint according to the fourth embodiment of the present invention will be described below with reference to Figure 12. Figure 12 is a longitudinal cross-sectional view including a first pipe axis and a second pipe axis illustrating the schematic configuration of the leg joint according to the fourth embodiment. In Figure 12, reference numeral 400 indicates the leg joint (joint), and reference numeral 20C indicates the leg joint body (joint body).

[0113] As shown in Figure 12, the leg joint (connector) 400 according to the fourth embodiment includes, for example, a leg joint body (connector body) 20C and an adapter 50. The difference between the leg joint (connector) 400 and the leg joint (connector) 100 according to the first embodiment is that the leg joint body (connector body) 20C is provided instead of the leg joint body (connector body) 20. Other parts are the same as in the first embodiment, so the same reference numerals are used and their description is omitted.

[0114] In the leg joint 400 according to the fourth embodiment, as shown in Figure 12, for example, the first connecting line 21aA of the curved pipe section 21C is composed of a plurality of connecting line segments 24a, 24b, and 24c. Connecting line segments 24a and 24b are connected at an obtuse angle to the concave side D2. Similarly, connecting line segments 24b and 24c, and connecting line segment 24c and the second connecting line 22a are each connected at an obtuse angle to the concave side D2. In other words, connecting line segments 24a, 24b, and 24c are formed in a bent shape. The first connecting line 21aA intermittently changes direction from along the first pipe axis O1 to intersecting the horizontal plane as it moves from the first socket 201 side to the second socket 202 side. The end of connecting segment 24a opposite to the end connected to connecting segment 24b is connected to the inner surface of the first socket 201.

[0115] The acute angle θ4 between the connecting line segment 24b and the second pipe axis O2 is preferably 40 degrees or 80 degrees. Even when configured as leg joint 400, the same effects as leg joint 10 in this embodiment can be achieved. Furthermore, the number of connecting line segments constituting the first connecting line is not limited to three; it may be one, two, or four or more. The first connecting line may also consist of one or more connecting line segments and one or more curves.

[0116] <Fifth Embodiment> The leg joint according to the fifth embodiment of the present invention will be described below with reference to Figures 13 and 14. Figure 13 is a front view along the second pipe axis illustrating the schematic configuration of the leg joint according to the fifth embodiment, and Figure 14 is a longitudinal cross-sectional view including the first pipe axis and the second pipe axis. In Figures 13 and 14, reference numeral 500 indicates the leg joint (joint), and reference numeral 20D indicates the leg joint body (joint body).

[0117] As shown in Figures 13 and 14, the leg joint (connector) 500 according to the fifth embodiment includes, for example, a leg joint body (connector body) 20D and an adapter 50. The difference between the leg joint (connector) 500 and the leg joint (connector) 100 according to the first embodiment is that the leg joint body (connector body) 20D is provided instead of the leg joint body (connector body) 20. Other parts are the same as in the first embodiment, so the same reference numerals are used and their description is omitted.

[0118] As shown in Figures 13 and 14, the leg joint body (joint body) 20D is equipped with a projection 25 in place of the leg body 23 of the leg joint 100 of the first embodiment. The projection 25 is formed on the outer circumferential surface of the convex side D1 of the curved pipe section 21D. The projection 25 is positioned across the position P1 corresponding to the convex side D1 of the first connecting wire 21a and the position P2 corresponding to the convex side D1 of the second connecting wire 22a in the curved pipe section 21D.

[0119] The projection 25 is formed on a part of the circumferential direction of the curved pipe section 21D. The projection 25 protrudes from the outer circumferential surface of the curved pipe section 21D toward the convex side D1. In this modified leg joint 500, positions P1 and P2 in the curved pipe section 21D are susceptible to the force of the drainage W flowing downwards. By providing a projection 25 on the leg joint 500, the outer surface of the curved pipe section 21D on the convex side D1 that spans positions P1 and P2 in the curved pipe section 21 can be reinforced by the projection 25.

[0120] When the leg joint 500 is formed by injection molding, if a gate mark 25A (shown as a dashed line in Figure 14) is formed on the protrusion 25, a weld is formed at position P3 on the opposite side of the gate mark 25A in the curved pipe section 21D.

[0121] In the curved pipe section 21D, there is a risk that the strength of the curved pipe section 21D may decrease at the location P3 where the gate marks 25A or weld lines are formed. However, by forming the gate marks 25A on the protrusion 25, the portion of the curved pipe section 21D where the gate marks 25A are formed can be reinforced by the protrusion 25. Furthermore, since the drainage water W is less likely to hit position P3 in the curved pipe section 21D, damage to this position P3 by the drainage water W can be suppressed.

[0122] <Sixth Embodiment> The leg joint according to the sixth embodiment of the present invention will be described below with reference to Figures 15 and 16. Figure 15 is a front view along the second pipe axis illustrating the schematic configuration of the leg joint according to the sixth embodiment, and Figure 16 is a longitudinal cross-sectional view including the first pipe axis and the second pipe axis. In Figures 15 and 16, reference numeral 600 indicates the leg joint (joint), reference numeral 20E indicates the leg joint body (joint body), and reference numeral 21E indicates the curved pipe section.

[0123] As shown in Figures 15 and 16, the leg joint (connector) 600 according to the sixth embodiment includes, for example, a leg joint body (connector body) 20E and an adapter 50. The difference between the leg joint (connector) 600 and the leg joint (connector) 100 according to the first embodiment is that the leg joint body (connector body) 20E is provided instead of the leg joint body (connector body) 20. Other parts are the same as in the first embodiment, so the same reference numerals are used and their description is omitted.

[0124] As shown in Figures 15 and 16, the leg joint body (joint body) 20E includes, for example, a curved pipe section 21E, a first socket (first connection section) 201, and a second socket (second connection section) 202. Furthermore, a tubular body 22E is formed on the second socket (second connection part) 202 side of the curved pipe section 21E. In a cross-sectional view including the first pipe axis O1 and the second pipe axis O2, the leg joint body (joint body) 20E has an end on the second connection line 22a of the tubular body 22E that is positioned on the concave side D2 of the second socket 202 rather than the inner surface of the convex side D1 of the second socket 202. The distance between the concave end D2 on the second socket 202 side of the second inner circumferential surface 22b of the curved pipe section 21E, and the distance between the second pipe axis O2 of the second socket 202 and the inner circumferential surface of the concave D2 of the second socket 202 are equal.

[0125] The stepped portion 202E formed on the inner circumferential surface of the connection between the tubular body 22E and the second socket 202 is not formed on the concave side D2 (upper side) of the second socket 202, but is formed on the convex side D1 (lower side) of the second socket 202. As a result, the second pipe axis O2 and the central axis of the horizontal pipe 120 do not coincide in the vertical direction (direction of the first pipe axis O1) but are misaligned.

[0126] The horizontal pipe 120 is locked in the direction of the second pipe axis O2 by a stepped portion at the convex side D1 of the second socket 202. An internal space is formed from the concave side D2 at the end of the horizontal pipe 120, extending toward the curved pipe section 21E along the second pipe axis O2, and becomes a vent V that allows air to flow into the curved pipe section 21E. In the leg joint 600, the stepped portion 202E allows the horizontal pipe 120 to be locked in a direction along the second pipe axis O2. Furthermore, since a ventilation portion V is formed in the leg joint 600, air can flow through the ventilation portion V when the drainage W flows through the bend 35, making it easier for the drainage W to flow through the bend 35. [Examples]

[0127] The embodiments of the present invention will be described below with reference to the table shown in Figure 17 (hereinafter also referred to as Table 1). Figure 17 (Table 1) is a table illustrating embodiments of the present invention. In the examples, the effects were confirmed using Comparative Examples 1 and 2 and the present invention as examples. Comparative Example 1, as shown in Figure 17 (Table 1), is composed of a single vertical rib that extends in the vertical direction and is arranged parallel to the left and right. Comparative Example 2 is composed of roughly V-shaped ribs in which the left and right surfaces are inclined outward relative to each other as they extend downward. An example of the present invention is composed of a pair of ribs formed in the shape of the Japanese katakana character "ハ" according to the first embodiment. The rib's protruding height was 15 mm, and its width was 36 mm as a projected width viewed from the first pipe axis.

[0128] In the examples, water was flowed at a discharge rate of 6.5 l / s in Comparative Examples 1 and 2, and in the present invention example, and the state of the water film and the pressure inside the pipe were observed. The results are shown in Figure 17 (Table 1). Furthermore, the "○" and "×" ratings in the evaluation were based on the internal pipe pressure. The internal pipe pressure was set at 400 Pa.

[0129] [Comparative Example 1] In Comparative Example 1, it was almost impossible to cleave the water film. As a result, the pressure inside the leg joint was 480 Pa. [Comparative Example 2] In Comparative Example 2, interference from splashing water was observed. As a result, the pressure inside the leg joint was 434 Pa. [Example of the present invention] In this example, it was confirmed that a large gap was formed in the water film, and that the water film could be stably cut. As a result, the pressure inside the leg joint was 315 Pa, which is significantly lower than the reference value of 400 Pa, confirming that a significant effect can be obtained.

[0130] It should be noted that the present invention is not limited to the embodiments described above, and various modifications (for example, changes, combinations, deletions, etc.) can be made without departing from the spirit of the invention.

[0131] For example, in the above embodiment, a case was described in which the leg joint (joint) comprises a leg joint body (joint body) and an adapter 50, and a pair of ribs 62 are formed on the adapter 50. However, for example, a configuration in which the pair of ribs 62 are integrally formed on the leg joint (body) 10 is also possible.

[0132] Furthermore, although the above embodiment described a case in which the adapter 50 comprises an adapter body 51, an elastic ring 52, and a fixing member 53, the configuration of the adapter 50 can be arbitrarily set.

[0133] Furthermore, in the above embodiment, for example, a case was described in which a pair of ribs 62 are formed in the shape of the Katakana character "ハ" (ha), but the configuration of the pair of ribs can be arbitrarily set. For example, a pair of ribs may be formed by a shape that is an inverted "ハ" or by two mountain-shaped rib pieces arranged on the left and right.

[0134] Furthermore, for example, in addition to the pair of ribs 62, the outer side of either or both of the pair of ribs 62 may be provided with ribs that spread outward from each other as they extend downward, so that, for example, when viewed from the first pipe axis O1 side, multiple rib pieces are arranged in a V-shape on the inner and outer sides.

[0135] Furthermore, although the above embodiment described a case in which the pair of ribs 62 are formed symmetrically with respect to the plane containing the first pipe axis O1, whether or not the pair of ribs 62 are formed symmetrically with respect to the plane containing the first pipe axis O1 can be arbitrarily set. Also, the various dimensions of the ribs 62 can be arbitrarily set.

[0136] Furthermore, in the above embodiment, the case was described in which the pair of ribs 62 are offset to the side away from the first pipe axis O1 when viewed from the base end side located on the inner circumferential surface side of the leg joint body 20 to the tip end side. However, for example, the tip end may be formed toward the pipe axis O1, or the tip end may be formed to intersect the pipe axis O1 on the inner circumferential surface side. Also, only one of the pair of ribs 62 may be formed offset with respect to the first pipe axis O1.

[0137] Furthermore, although the above embodiment described the case in which the ribs 62 are formed in a flat plate shape, for example, they may be formed such that the inclination with respect to the first pipe axis O1 gradually decreases as they are spaced apart from each other (convex towards the pair of ribs), or the inclination with respect to the first pipe axis O1 gradually increases as they are spaced apart from each other (convex towards the pair of ribs). Also, only one of the pair of ribs 62 may be formed in a flat plate shape.

[0138] Furthermore, although the above embodiment described a case in which the main wall portion of the rib 62 is formed to a uniform thickness, the thickness of the main wall portion of the rib 62 can be set arbitrarily. For example, the tip side may be formed to be thinner than the base side, the side on which a pair of ribs are close together in the circumferential direction may be formed to be thicker than the side on which they are separated, or the side on which a pair of ribs 62 are close together in the circumferential direction may be formed to be thinner than the side on which they are separated. Also, only one of the pair of ribs 62 may be formed to a uniform thickness.

[0139] Furthermore, in the above embodiment, it is possible to arbitrarily set whether or not to form an enlarged diameter section or a flow straightening vane in the lower connecting pipe (vertical pipe) 114 and the centralized pipe 111 in the drainage system (piping structure) 1. For example, the lower connecting pipe (vertical pipe) 114 and the centralized pipe 111 may be configured to have either or both of an enlarged diameter section and a swirling vane 113 formed on them.

[0140] Furthermore, the combinations of drainage system (piping structure) 1, drainage system (piping structure) 1A, and leg joints 100, 200, 300, 400, 500, and 600 can be arbitrarily set.

[0141] Furthermore, although the above embodiment described the case in which the first connection part of the leg joint is a socket (first socket) 201, the first connection part is not limited to a socket and can be set arbitrarily. For example, the first connection part may be made of a socket or a flange. The same applies to the second connection part.

[0142] 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 the above embodiments may also be applied in appropriate combinations. [Explanation of Symbols]

[0143] 1. 1A Drainage System (Piping Structure) 100, 200, 300, 400, 500, 600 Leg joints (joints) 20, 20A, 20B, 20C, 20D, 20E Leg joint body 21, 21A, 21B, 21C, 21D, 21E Bent pipe section 114 Lower connecting pipe (vertical pipe) 120 Horizontal pipe 201 First socket (socket, first connection part) 202 Second socket (second connection part) 22, 22E tubular body 50 adapter 56 Water film cutting section (water film cutting means) 62 Ribs (a pair of ribs) O1 First tube axis O2 2nd tube shaft

Claims

1. A joint comprising a first connecting portion to which a vertical pipe is connected, a second connecting portion to which a horizontal pipe is connected, and a curved pipe portion connecting the first connecting portion and the second connecting portion, wherein the curved pipe portion has a projection on its outer surface, Equipped with a means for cutting water film, The water film cutting means is The first connecting portion is provided with a pair of ribs formed on the side where the second connecting portion is located in the circumferential direction of the first connecting portion, extending along the first pipe axis of the first connecting portion and protruding inward from the inner circumferential surface, The pair of ribs are, They are arranged with a circumferential gap between them, and the circumferential gap on the outer side of the pair of ribs widens or narrows as they extend downward, and they are formed to protrude from the inner circumferential surface of the vertical tube. A joint in which the upper ends of the pair of ribs are in the same position in the axial direction of the first pipe.

2. The joint according to claim 1, The pair of ribs are formed to have a protrusion height of 5 mm or more relative to the inner circumferential surface of the vertical pipe, and a circumferential width dimension of 5 mm or more when viewed along the first pipe axis.

3. A joint according to claim 1 or 2, The pair of ribs are, A joint formed such that the distance between opposing circumferentially inward sides increases as it extends downward.

4. A joint according to any one of claims 1 to 3, The pair of ribs are, A joint formed such that, when viewed from the base end side located on the inner circumferential surface side to the tip side, the tip is offset to a side that is separated from the first pipe axis.

5. A joint according to any one of claims 1 to 4, The pair of ribs are a joint formed in a flat plate shape.

6. A joint according to any one of claims 1 to 5, The pair of ribs are, A joint in which the main wall is formed to a uniform thickness.

7. An adapter having a first connecting portion to which a vertical pipe is connected, a second connecting portion to which a horizontal pipe is connected, and a curved pipe portion connecting the first connecting portion and the second connecting portion, and having a projection on the outer surface of the curved pipe portion, wherein the adapter is positioned between the first socket of a joint body, where the first connecting portion is the first socket, and the vertical pipe, An adapter comprising the water film cutting means and disposed on the joint body, thereby constituting the joint according to any one of claims 1 to 6.

8. A joint according to any one of claims 1 to 6, A vertical pipe connected to the first connection part, and a horizontal pipe connected to the second connection part, A piping structure equipped with this feature.

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