Joint, adapter, and piping structure

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 that enable wastewater to flow smoothly from a vertical pipe to a horizontal pipe. [Background technology]

[0002] Conventionally, when draining wastewater falling from a vertical pipe into 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 (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-116732 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the joint in Patent Document 1 had the problem that wastewater falling from the vertical pipe was prone to forming a water film, and wastewater that directly collided with the bottom of the joint was prone to splashing up, hindering proper drainage.

[0005] The present invention has been made in consideration of such problems, and has an object to provide a joint, adapter, and piping structure that enables wastewater to flow smoothly from a vertical pipe to a horizontal pipe. [Means for solving the problem]

[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 connection part to which a vertical pipe is connected, a second connection part to which a horizontal pipe is connected, and a curved pipe part connecting the first connection part and the second connection part, and comprising a water film cutting means, the water film cutting means comprising a pair of ribs formed on the side of the first connection part where the second connection part is arranged in the circumferential direction, extending along a first pipe axis of the first connection part, and protruding inwardly from an inner peripheral surface, the pair of ribs being arranged at intervals from each other in the circumferential direction, the interval between the outer sides of the pair of ribs increasing or decreasing toward the bottom, and formed to protrude relative to the inner peripheral surface of the vertical pipe. (2) In the joint described in (1) above, the pair of ribs may be formed so that the protruding height relative to the inner peripheral surface of the vertical pipe is 5 mm or more, and the circumferential width dimension as viewed along the first pipe axis is 5 mm or more.

[0007] According to the joint of the present invention, a water film cutting means is provided, and the water film cutting means is formed on the circumferential side (downward) of the first connection part where the second connection part is located, and is arranged circumferentially at intervals on the first connection part, and is arranged with increasing spacing inward as it goes downward, and the circumferential spacing of the outer sides of the pair of ribs increases or decreases as it goes downward, and is formed so as to protrude toward the inner surface of the vertical pipe, so that the wastewater flowing down from the vertical pipe can be efficiently cut to create spacing in the water film formed in the flow path to the second connection part side of the joint. As a result, wastewater can be efficiently diverted from the vertical pipes to the horizontal pipes.

[0008] Here, the phrase "the circumferential distance between the outer sides of the pair of ribs increases going downward" means that when the first connection part of the joint is deployed around the first pipe axis, the distance between the faces located on the outer sides of the pair of ribs gradually increases going downward. In other words, the pair of ribs may be formed in an approximately V-shape, or may be formed by two mountain shapes arranged on the left and right, and can be set arbitrarily. The protruding height relative to the inner peripheral surface of the vertical pipe refers to the maximum dimension of the protruding amount extending toward the inside of the joint relative to the inner peripheral surface of the vertical pipe. Moreover, the circumferential width dimension when viewed along the pipe axis of the first connecting portion refers to, for example, the circumferential width at the base end portion of the rib.

[0009] (3) In the joint described in (1) or (2) above, the pair of ribs may be formed such that the distance between the ribs on the circumferentially inner sides facing each other increases toward the bottom.

[0010] According to the joint of the present invention, a pair of ribs are formed so that the distance between them on their opposing circumferentially inner sides increases as they extend downward, so that wastewater flowing down from the vertical pipe can be guided in a direction away from the pair of ribs in the circumferential direction, thereby more efficiently cutting the water film.

[0011] Here, the spacing between opposing circumferentially inward sides increases as it goes downward means that when unfolded around the first tube axis, it forms an approximately V-shape. For example, the length in the up-down direction, the protruding height, the width dimension, the left and right inclination angles, the thickness of the left and right ribs, the thickness distribution (change in rib thickness in the up-down direction), etc. do not need to be symmetrical, and may be set arbitrarily as long as the effect is obtained.

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

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

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

[0015] According to the joint of the present invention, a pair of ribs are formed in a flat plate shape, so that when the wastewater flows down along the surface of the pair of ribs, the direction of the wastewater is less likely to change, and the wastewater can flow stably in a specified direction.

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

[0017] According to the joint of the present invention, the pair of ribs have main wall portions formed to a uniform thickness, so that 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 pair of ribs excluding the outer peripheral edge portions of the pair of ribs, and specifically does not include chamfered portions or corner R shapes, etc. formed from either side of the rib at the outer peripheral edge portion of the rib toward the end face.

[0018] (7) A second aspect of the present invention is an adapter having a first connection portion to which a vertical pipe is connected, a second connection portion to which a horizontal pipe is connected, and a curved pipe portion connecting the first connection portion and the second connection portion, the adapter being arranged between the vertical pipe and the first receiving port of a fitting body in which the first connection portion is a first receiving port, and being arranged in the fitting body to constitute a fitting described in any one of (1) to (6) above.

[0019] According to the adapter of the present invention, the first connection portion is disposed between the first socket of the joint body, which is the first socket, and the vertical pipe, so that the adapter is configured to constitute the joint described in any one of (1) to (6) above, and therefore the joint can be easily constituted. In addition, 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 the fitting described in any one of (1) to (6) above, a vertical pipe connected to the first connection part, and a horizontal pipe connected to the second connection part.

[0021] According to the piping structure of the present invention, even if the lowest floor joint (including the centralized piping and vertical pipe) is not formed with an enlarged diameter section and a straightening vane, wastewater can be smoothly flowed into the horizontal pipe. Effect of the Invention

[0022] According to the joint, adapter, and piping structure of the present invention, wastewater can be smoothly flowed from the vertical pipe to the horizontal pipe. [Brief description of the drawings]

[0023] [Figure 1] 1 is a vertical cross-sectional view including a first pipe axis and a second pipe axis, illustrating a schematic configuration of a piping structure according to a first embodiment of the present invention. [Diagram 2] FIG. 4 is a front view illustrating a schematic configuration of the leg joint according to the first embodiment, taken along a second pipe axis. [Diagram 3] FIG. 2 is a longitudinal sectional view including a first pipe axis and a second pipe axis, illustrating a schematic configuration of the leg joint according to the first embodiment. [Figure 4] 4 is a schematic configuration diagram illustrating the schematic configuration of the leg joint according to the first embodiment, in which a main part in FIG. 3 is enlarged. FIG. [Diagram 5] 1 is a vertical sectional view including a tube axis for explaining a schematic configuration of an adapter according to a first embodiment. FIG. [Figure 6] 1 is a plan view illustrating a schematic configuration of an adapter according to a first embodiment, viewed along a first tube axis. [Figure 7] FIG. 2 is a perspective view illustrating a schematic configuration of the adapter according to the first embodiment. [Figure 8] FIG. 6 is a vertical cross-sectional view including a first pipe axis and a second pipe axis, illustrating a schematic configuration of a piping structure according to a second embodiment of the present invention. [Figure 9] FIG. 11 is a front view taken along a second pipe axis for explaining a schematic configuration of a leg joint according to a second embodiment. [Figure 10] FIG. 11 is a longitudinal sectional view including a first pipe axis and a second pipe axis, illustrating a schematic configuration of a leg joint according to a second embodiment. [Figure 11]FIG. 11 is a longitudinal sectional view including a first pipe axis and a second pipe axis, illustrating a schematic configuration of a leg joint according to a third embodiment of the present invention. [Figure 12] FIG. 11 is a longitudinal sectional view including a first pipe axis and a second pipe axis, illustrating a schematic configuration of a leg joint according to a fourth embodiment of the present invention. [Figure 13] FIG. 13 is a front view taken along a second pipe axis, illustrating a schematic configuration of a leg joint according to a fifth embodiment of the present invention. [Figure 14] FIG. 13 is a longitudinal sectional view including a first pipe axis and a second pipe axis, illustrating a schematic configuration of a leg joint according to a fifth embodiment of the present invention. [Figure 15] FIG. 13 is a front view taken along a second pipe axis, illustrating a schematic configuration of a leg joint according to a sixth embodiment of the present invention. [Figure 16] FIG. 13 is a longitudinal sectional view including a first pipe axis and a second pipe axis, illustrating a schematic configuration of a leg joint according to a sixth embodiment of the present invention. [Figure 17] 1 is a table illustrating an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] First Embodiment Hereinafter, a leg joint (joint) and a drainage system (piping structure) according to a first embodiment of the present invention will be described with reference to Figs. 1 to 7. Fig. 1 is a vertical cross-sectional view including a pipe axis for explaining the schematic configuration of the piping structure according to the first embodiment, Fig. 2 is a front view along the second pipe axis for explaining the schematic configuration of the leg joint, Fig. 3 is a vertical cross-sectional view including the first and second pipe axes, Fig. 4 is a schematic diagram of the leg joint with an enlarged main part in Fig. 3. Fig. 5 is a vertical cross-sectional view including a pipe axis for explaining the schematic configuration of the adapter according to the first embodiment, Fig. 6 is a plan view along the first pipe axis, and Fig. 7 is a perspective view for explaining the schematic configuration.

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

[0026] First, with reference to FIG. 1, a drainage system (piping structure) 1 according to a first embodiment will be described. The drainage system (piping structure) 1 is applied to, for example, a multi-story building (building) such as a high-rise apartment building or a commercial building. In the drainage system (piping structure) 1, wastewater discharged from sanitary equipment (drainage equipment) such as toilets, vanities, and sinks on each floor flows into a vertical main pipe (not shown) that constitutes a drainage channel via a horizontal branch pipe (not shown).

[0027] 1, the drainage system (piping structure) 1 includes a collective joint 110, a lower connection pipe (vertical pipe: straight pipe) 114 connected to a lower vertical pipe connection part 111C of the collective joint 110, a leg joint (joint) 100 having a leg joint body 20 connected to the lower end side of the lower connection pipe 114 and formed in a generally L-shape in side view, and a horizontal main pipe (horizontal pipe) 120 connected to the leg joint 100 and extending horizontally. Also, a vertical main pipe (not shown) extending downward from an upper floor is connected to the upper vertical pipe connection part 111A of the collective joint 110.

[0028] A vertical main pipe (first vertical pipe, not shown) is provided so as to pass through each floor (floor slab, not shown). Then, wastewater 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 collective 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 sewer main pipe, a septic tank, or the like. In this way, the drainage system 1 discharges wastewater from the drainage facilities on each floor to the outside of the building.

[0029] The vertical main pipe (first vertical pipe, not shown) collects the drainage water from the drainage equipment installed on each floor and guides it downward. The vertical main pipe is equipped with a plurality of collecting joints installed corresponding to each floor, and a first pipe (not shown) that connects the collecting joints installed on adjacent floors in the vertical direction.

[0030] Of the multiple collective joints, as shown in Figure 1, the collective joint 110 for the lowest floor installed on the lowest floor of the building has a lower connecting pipe (vertical pipe: straight pipe) 114 of the first embodiment, a leg joint 100, and a horizontal pipe 120 connected to it in that order.

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

[0032] In the first embodiment, the collective joint 110 is an example in which, for example, a joint pipe main body 111 is provided with a well-known backflow prevention rib 112 and a swirl vane 113, as shown in FIG. Furthermore, by applying the leg joint 100 of the first embodiment, it is possible to ensure good drainage performance even if the backflow prevention rib 112, swirl vane 113, enlarged diameter portion, etc. are not formed, and it is preferable not to form the backflow prevention rib 112, swirl vane 113, enlarged diameter portion, etc. That is, the drainage system (piping structure) 1 may be configured such that no protrusion (backflow prevention rib, swirl vane, etc.) is provided in the lowest floor joint, and no enlarged diameter portion is provided.

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

[0034] Furthermore, horizontal branch pipes (not shown) are connected to the branch pipe connecting portions 111B, respectively, so that wastewater discharged from the drainage facility is guided into the inside of the joint pipe main body 111 via the branch pipe connecting portions 111B.

[0035] The lower connecting pipe (vertical pipe: straight pipe) 114 is connected to a first socket (first connecting portion) 201 formed on the upper end of the leg joint 100, for example. In addition, the horizontal main pipe (horizontal pipe) 120 is connected to the second receiving port (second connection part) 202 of the leg joint 100, so that 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 of a resin composition containing, for example, polyvinyl chloride resin and thermally expandable graphite, which is a thermally expandable fire-resistant material. Specifically, the lower connecting pipe 114 is formed by extrusion molding a resin composition containing a thermally expandable fire-resistant material. By providing these heat-expandable fire-resistant materials, fire resistance can be achieved when the lower connecting pipe 114 is inserted through a through hole provided in the floor slab.

[0037] As an example, a single-layer structure made of a resin composition containing 1 to 20 parts by weight of thermally expandable graphite relative to 100 parts by weight of polyvinyl chloride resin can be adopted. Alternatively, a three-layer structure made of a thermally expandable fire-resistant layer made of a resin composition containing 1 to 20 parts by weight of thermally expandable graphite relative to 100 parts by weight of polyvinyl chloride resin and a coating layer of a polyvinyl chloride resin composition not containing thermally expandable graphite covering the inner and outer surfaces of the thermally expandable fire-resistant layer may be adopted. In the case of a three-layer structure, the ratio of the thermally expandable graphite to 100 parts by weight of polyvinyl chloride resin is more preferably 6 to 18 parts by weight, and more preferably 10 to 16 parts by weight. If the amount of thermally expandable graphite is less than 1 part by weight, sufficient thermal expansion is not obtained during combustion, and the desired fire resistance may not be obtained. If the amount of thermally expandable graphite exceeds 20 parts by weight, the graphite may expand too much when heated or the resin component may be insufficient, causing the residue to become brittle and unable to maintain its shape, which may lead to the residue dropping out of the through holes, resulting in reduced fire resistance. The lower connecting pipe (vertical pipe) 114 may be formed from a normal resin such as polyvinyl chloride resin, and a thermal expansion sheet may be wrapped around the outer circumferential surface of the lower connecting pipe (vertical pipe) 114 .

[0038] The horizontal main pipe 120 guides the wastewater flowing down from the lower connecting pipe (vertical pipe) 114 horizontally and discharges it into a septic tank or a 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 metal fitting (not shown) or the like.

[0039] The lateral branch pipe connecting portion 111B extends, for example, radially outward from the peripheral wall of the joint pipe main body 111. In this embodiment, three lateral branch pipe connecting portions 111B are formed. Of the three side branch pipe connecting portions 111B, two are disposed at positions sandwiching the pipe axis O of the joint pipe main body 111. The remaining side branch pipe connecting portion 111B extends in a direction that forms an angle of 90° in the circumferential direction with the extension directions of the two side branch pipe connecting portions 111B when viewed along the pipe axis O.

[0040] The number and extending direction of the side branch pipe connecting parts 111B are not limited to the above example and can be set arbitrarily. In the example shown in the figure, side branch pipes (not shown) are connected separately to the side branch pipe connecting parts 111B, but some of the side branch pipe connecting parts 111B may be closed by a blocking member such as a bush as necessary.

[0041] The joint pipe body 111 is made of a polyvinyl chloride resin composition containing, for example, 100 parts by weight of polyvinyl chloride resin and 0.1 to 10.0 parts by weight of a flame retardant such as non-expandable graphite, magnesium hydroxide, or aluminum hydroxide. Specifically, the joint pipe body 111 is formed, for example, by injecting and filling the polyvinyl chloride resin composition into the cavity of a molding machine.

[0042] In the collective joint 110, a cylindrical adapter 115 is 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 gasket 116 is inserted into 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 processing member 117 has a ring shape that is fitted onto the upper end of the adapter 115, and has an insertion hole 117A through which the lower end of the vertical main pipe (not shown) can be inserted. An engagement protrusion 115a that extends circumferentially with a predetermined thickness is formed on the upper end of the outer circumferential surface of the adapter 115. The ring-shaped end processing member 117 is fitted so as to surround the outer periphery of this engagement protrusion 115a, whereby the end processing member 117 is fitted onto the upper end of the adapter 115.

[0044] Vertical packing 116 has a cylindrical body 116a fitted inside adapter 115, and has a lip portion 116b protruding from the inner circumferential surface of cylindrical body 116a. The vertical gasket 116 is made of a rubber material typically used in drainage equipment, such as ethylene-propylene-diene rubber (EPDM), and is a gasket in which the lip portion 116b provided on the inner circumference of the upper end portion can be watertightly fitted to the outer circumference of the lower end portion of the vertical main pipe (not shown).

[0045] In addition, an inner peripheral step 116c is formed at the lower end of the cylindrical body 116a to reduce the inner diameter of the lower end of the cylindrical body 116a. When the lower end of the vertical main pipe (not shown) is inserted into the vertical packing 116, the inner peripheral step 116c functions as a stopper for the vertical main pipe (not shown).

[0046] The adapter 115 has a fitting portion 115b on a lower portion of the outer peripheral wall. This fitting portion 115b has a smaller diameter than an upper portion 115c of the outer peripheral wall of the adapter 115. By inserting the fitting portion 115b into the vertical pipe connecting portion 111A on the upper side of the joint pipe main body 111, the adapter 115 can be fitted to the vertical pipe connecting portion 111A of the joint pipe main body 111. An inward ring-shaped inner peripheral flange 115d is formed on the inner peripheral portion of the adapter 115 at the lower end side of the fitting portion 115b.

[0047] In this embodiment, the projection length of the inner circumferential flange 115d (the projection length of the inner circumferential flange 115d along the radial direction from the inner circumferential surface of the cylindrical fitting portion 115b toward the axis of the fitting portion 115b) is set to a projection length capable of supporting the inner circumferential step portion 116c provided in the vertical packing 116. Therefore, the inner diameter of the inner circumferential flange 115d is approximately the same as the inner diameter of the inner circumferential step portion 116c in the vertical packing 116, and is approximately the same as the inner diameter of the lower end portion of the vertical main pipe (not shown) inserted into the vertical packing 116.

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

[0049] The leg joint (joint) 100 includes, for example, a leg joint main body (joint main body) 20 and an adapter 50, as shown in FIGS. The leg joint body (joint body) 20 includes a first socket (first connection part) 201, a second socket (second connection part) 202, and a curved pipe part 21. The following description will be given taking as an example the arrangement of the leg joint 100 in which the lower connection pipe (vertical pipe) 114 is connected to the first socket 201 of the leg joint 100 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 materials forming the leg joint body (joint body) 20 and the adapter 50 can be set arbitrarily, and may be made of a transparent material, for example.

[0050] The first receiving port 201 is formed in a cylindrical shape. The first receiving port 201 is arranged so that the first tube axis O1 of the first receiving port 201 is aligned along the vertical direction. Here, the first tube axis O1 aligned along the vertical direction means, for example, that the acute angle between the first tube axis O1 and the vertical direction is 5 degrees or less, or that the first tube axis O1 is parallel to the vertical direction. The same applies to the second connection line 22a, which will be described later, aligned along the second tube axis O2, etc. The inner diameter of first receiving port 201 is larger than the outer diameter of lower connecting pipe (vertical pipe) 114. Lower connecting pipe (vertical pipe) 114 is disposed along the up-down direction. A lower end portion of lower connecting pipe 114 is disposed within first receiving port 201.

[0051] The second receiving port 202 is formed in a cylindrical shape. The second receiving port 202 is arranged so that the second pipe axis O2 of the second receiving port 202 is along a horizontal plane. The second receiving port 202 may be arranged so as to be inclined with respect to the horizontal plane to such an extent that the horizontal pipe 120 has a water gradient. The second tube axis O2 is disposed so as to intersect with the first tube axis O1.

[0052] The inner diameter of the second receiving port 202 and the outer diameter of the horizontal pipe 120 are formed to be substantially equal. An end of the horizontal pipe 120 is disposed in the second receiving port 202. The horizontal pipe 120 is disposed along the horizontal direction. A sealing member is preferably disposed between first receiving port 201 and lower connecting pipe (vertical pipe) 114 in order to prevent drainage water from leaking to the outside from between first receiving port 201 and lower connecting pipe (vertical pipe) 114. The same applies to between second receiving port 202 and horizontal pipe 120.

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

[0054] The bent pipe portion 21 is, for example, a bent pipe shape that changes the direction of the wastewater flow by about 90 degrees. The curved tube portion 21 is a first connection line 21a that is curved such that the inner circumferential surface of the convex side D1 is convex toward the convex side D1 in a cross-sectional view including the first tube axis O1 and the second tube axis O2. For example, in a cross section on a plane formed by the first tube axis O1 and the second tube axis O2 shown in FIG. 3, the central angle θ0 of the circular arc formed by the first connection line 21a is set to be less than 90 degrees.

[0055] A first end 21a1 (an end on the first socket 201 side) of the first connection line 21a is continuous with the inner peripheral surface of the first socket 201. The first end 21a1 of the first connection line 21a preferably extends along the first tube axis O1 of the first socket 201. Moreover, the first end 21a1 is a circular opening with its central axis parallel to the first tube axis O1.

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

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

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

[0059] The inner circumferential surface 22b of the concave side D2 of the curved pipe portion 21 is linear. The inner circumferential surface 22b and the inner circumferential surface 21b of the curved pipe portion 21 together form a second inner circumferential surface 20b of the concave side D2 of the curved pipe portion 21. The inner diameter of the curved pipe portion 21 is smaller than the inner diameter of the second socket 202. The curved pipe portion 21 is coaxially connected to the second socket 202. A step is formed on the inner circumferential surface of the connection between the curved pipe portion 21 and the second socket 202, all around the inner periphery of the second socket 202. The horizontal pipe 120 is locked in the direction of the pipe axis O2 by this step.

[0060] The leg body 23 is formed, for example, in a truncated cone shape. The leg body 23 is disposed such that the axis of the leg body 23 is aligned 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 portion 21. The lower end of the leg 23 and the lower end of the second socket 202 are disposed at the same position relative to each other in the up-down direction.

[0061] The curved pipe portion 21, the first socket 201, and the second socket 202 that constitute the leg joint body 20 are integrally formed by, for example, 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 disposed 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. Hereinafter, the radial direction of the adapter 50 will be simply referred to as the radial direction, and the circumferential direction of the adapter 50 will be simply referred to as the circumferential direction.

[0063] As shown in FIG. 3, the adapter 50 includes, for example, an adapter body 51, an elastic ring 52, and a fixing member 53. As shown in FIGS. 4 to 7, the adapter body 51 includes, for example, a body portion 55 and a water film cutting portion (water film cutting means) 56. As shown in FIG. 4, main body portion 55 is disposed within first receiving port 201, and its lower surface is supported by step portion 201A. A lower connecting pipe (vertical pipe) 114 is disposed inside the main body portion 55. The main body portion 55 includes a ring portion 57 and a first cylindrical portion 58, as shown in FIG.

[0064] The components of the adapter 50, except for the elastic ring 52, may be formed from polyvinyl chloride resin, for example, from 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 vinyl chloride resins, such as (1) resins obtained by mixing polyvinyl chloride polymers with impact-improved resins, (2) resins obtained by graft-copolymerizing polyvinyl chloride polymers with impact-improved resins, (3) copolymers of vinyl chloride monomers with monomers having unsaturated bonds copolymerizable with the vinyl chloride monomers, and (4) graft copolymers obtained by graft-copolymerizing vinyl chloride with (co)polymers other than vinyl chloride. These (1) to (4) may be used alone or in combination of two or more. If necessary, the polyvinyl chloride resins may be chlorinated.

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

[0066] By using a polyvinyl chloride resin in which the above-mentioned resin having rubber properties is mixed or graft-copolymerized, the impact resistance of the polyvinyl chloride resin can be improved. The adapter 50 has a complex structure and is easily damaged. However, by using a resin with excellent impact resistance for the adapter 50, it is possible to prevent the adapter 50 from being damaged, for example, when the leg joint body 20 and the adapter 50 are accidentally dropped.

[0067] The ring portion 57 is fitted (tightly fitted) into the first receiving port 201. As shown in Fig. 3, the axis of an opening 57a on the inside of the ring portion 57 is shifted toward the convex side D1 in a direction perpendicular to the first receiving port 201 with respect to the first tube axis O1 of the first receiving port 201. The opening 57a is eccentric with respect to the first receiving port 201. As shown in Fig. 4, the ring portion 57 includes a thick portion 59 and a thin portion 60.

[0068] The thick-walled portion 59 is the outer periphery of the ring portion 57, and the thin-walled portion 60 is the inner periphery of the ring portion 57. The thick-walled portion 59 and the thin-walled portion 60 are disposed continuously in the radial direction. The thickness of the thin-walled portion 60 (the 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 portion 60 is connected via a step to the upper surface of the thick portion 59. The lower surface of the thin portion 60 is smoothly connected to the lower surface of the thick portion 59 without any step.

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

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

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

[0072] In this embodiment, the plate portion 63 has an inner surface (surface on the first tube axis O1 side) formed in an arc shape coaxial with and having the same diameter as the inner circumferential surface of the opening 57a of the ring portion 57, as shown in FIG. Therefore, the inner surface of the plate portion 63 is configured to be flush with the inner peripheral surface of the curved pipe portion 21 of the leg joint body (joint body) 20 and the inner peripheral surface of the lower connecting pipe (vertical pipe) 114. 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 to the inside of the curved pipe portion 21 in the direction of the first pipe axis O1.

[0073] The pair of ribs 62 have their base ends supported by the inner circumferential surface of the plate portion 63, and their tip sides formed to protrude toward the inner circumferential side (diametrically inward) of the curved pipe portion 21. The pair of ribs 62 are formed to extend to the inside (lower side) of the curved pipe portion 21 in the direction of the first pipe axis O1.

[0074] In addition, the pair of ribs 62 are formed symmetrically with respect to a plane including the first tube axis O1, are formed in an approximate V shape, and various dimensions including the circumferential width dimension L1, the protruding height L2, and the rib thickness are formed to be equal. Moreover, the pair of ribs 62 are formed offset with respect to the first tube axis O1 when viewed from the base end to the tip end. Specifically, the pair of ribs 62 extend toward the side away from the first tube axis O1.

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

[0076] The pair of ribs 62 are formed such that the distance between the ribs 62 on the outer and inner surfaces gradually increases downward in the direction of the first tube axis O1. Specifically, the pair of ribs 62 are formed such that they open at an angle of 30° with respect to a plane including the first tube axis O1. The distance 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 including the first tube axis O1 may be different from each other, but are preferably the same. The pair of ribs 62 may be formed so that the distance between the ribs 62 on the outer surface and the inner surface gradually decreases (reduced) downward in the direction of the first tube axis O1, and may be formed so as to close at an angle of 30° with respect to a plane including the first tube axis O1. That is, the pair of ribs 62 may be substantially inverted V-shaped.

[0077] Each of the ribs 62 is formed, for example, in the shape of a flat plate whose upper and lower surfaces in the direction of the first tube axis O1 are parallel to each other. The main wall portions of the 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 does not include chamfered portions or corner R shapes formed from either face of the rib toward the end face at the outer peripheral edge of the rib.

[0078] Moreover, the rib 62 is formed, for example, with a circumferential width dimension L1 of 19 mm when viewed along the first tube axis O1, and a protruding height L2 of 17 mm. Moreover, the pair of ribs 62 is formed to have a length of 39 mm along the direction of the first tube axis O1. The circumferential width dimension L1 of the rib 62 is set in the range of 5 mm to 40 mm, and preferably in the range of 10 mm to 30 mm. The protruding height L2 of the rib 62 is set in the range of 5 mm to 60 mm, and preferably in the range of 10 mm to 50 mm. The circumferential width dimension L1 and the protruding height L2 of the pair of ribs 62 may be different from each other, but are preferably the same from each other.

[0079] Moreover, the rib 62 is formed, for example, in a curved shape that protrudes upward so that the protruding height gradually increases from top to bottom when viewed from a direction perpendicular to the surface of the rib 62, and is formed so that the protruding height reaches a maximum midway in the direction of the first tube axis O1. Also, a corner R is formed radially inward at the lower end of the rib 62.

[0080] 4, the elastic ring 52 is formed of an elastic body such as rubber. The elastic ring 52 is disposed in a main body portion 55. A lower connecting pipe (vertical pipe) 114 is fitted into the elastic ring 52. The elastic ring 52 includes a main body ring 64, a first convex portion 65, and a second convex portion 66. The main body ring 64 is tightly fitted inside the first cylindrical portion 58. The inner diameter of the main body 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 equal to the inner diameter of the ring portion 57. The first protrusion 65 is supported from below the first protrusion 65 by the ring portion 57. The upper surface of the first protrusion 65 is abutted against the lower end surface of the lower connecting pipe (vertical pipe) 114.

[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 second protrusion 66 is elastically deformed downward and radially outward by the lower connecting pipe (vertical pipe) 114 inserted into the elastic ring 52. As a result, the second protrusion 66 comes into close contact (pressure welded) with the entire circumference of the lower connecting pipe (vertical pipe) 114, and sealing between the elastic ring 52 and the lower connecting pipe (vertical pipe) 114 is ensured.

[0083] The fixing member 53 is attached to the main body portion 55 and prevents the elastic ring 52 from coming off the main body portion 55. The fixing member 53 is disposed in the first socket 201 of the leg joint 100. The fixing member 53 includes a second tubular portion 67 and a flange portion 68.

[0084] The second cylindrical portion 67 is fitted (interference-fitted) into the first cylindrical portion 58 from the radially inner side. In this embodiment, the second cylindrical portion 67 is disposed between the first cylindrical portion 58 and the first receiving port 201. The second cylindrical portion 67 is fitted (interference-fitted) into the first receiving port 201. A lower end surface of the second cylindrical portion 67 is spaced upward from an upper surface of the thick-walled portion 59.

[0085] The flange portion 68 protrudes radially inward from the upper end portion 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. The adapter 50 (particularly the adapter body 51 and the fixing member 53) may be transparent from the viewpoint of visibility.

[0086] The leg joint 100 of this embodiment is used by allowing wastewater W to flow downward into the leg joint 100 from the lower connecting pipe (vertical pipe) 114 side. At the first inner surface 20a where the wastewater W flowing from the lower connecting pipe (vertical pipe) 114 to the curved pipe section 21 hits, the first connecting line 21a and the second connecting line 22a are connected at an obtuse angle θ1, so that the acute angle θ2 between the vertical direction and the first connecting line 21a is smaller than that of the convex inner surface of the bend section in Patent Document 1 (the first connecting line 21a is arranged to follow the vertical direction).

[0087] As a result, the force that the wastewater W flowing downward receives from the curved pipe section 21 when it hits the first connection line 21a of the curved pipe section 21 is relatively small, and the wastewater W can be prevented from splashing up when it hits the curved pipe section 21. In addition, the length of the leg joint body 20 in the vertical direction becomes relatively short, and the fit of the leg joint body 20 can be improved.

[0088] A first end 21a1 of the first connection line 21a extends along a first pipe axis O1 of the first socket 201. Therefore, the angle between the first end 21a1 of the first connection line 21a and the vertical direction is smaller than the angle between the second end 21a2 of the first connection line 21a and the vertical direction. Then, the force that the wastewater W flowing downward receives from the curved pipe portion 21 when it hits the first end 21a1 of the first connection line 21a is smaller, and the splashing up of the wastewater W when it hits the curved pipe portion 21 can be further suppressed.

[0089] The leg joint body 20 includes a curved pipe portion 21. Therefore, when the leg joint body 20 is formed by injection molding using a mold, the leg joint body 20 moves back along the second connection line 22a of the tubular body 22 when it is removed from the core that forms the second receiving port 202 in the mold. Therefore, the second connection line 22a of the curved pipe section 21 can be formed using the core that forms the second receiving port 202. Since the second connection line 22a has a flat surface below the curved pipe section 21, the volume of the space within the leg joint main body 20, i.e., the air passage when the wastewater W flows through the leg joint main body 20, can be secured.

[0090] According to the leg joint 100 and drainage system (piping structure) 1 of the first embodiment, the pair of ribs 62 are provided with a water film cutting section 56 in which the upper ends are arranged with a circumferential gap between them and the circumferential gap between them increases toward the lower side (lower side), so that the water film of the drainage water flowing down from the lower connecting pipe (vertical pipe) 114 can be efficiently cut so that a gap is formed in the water film. Therefore, the inside of the leg joint 100 can be prevented from rising. As a result, even if the vertical pipe (including the centralized piping) is not formed with an enlarged diameter section and a flow straightening vane, the wastewater from the lower connecting pipe (vertical pipe) 114 can be smoothly flowed into the horizontal pipe 120.

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

[0092] Furthermore, according to the leg joint 100, the pair of ribs 62 are formed in a flat plate shape, so that when the wastewater flows down along the surfaces of the pair of ribs, the wastewater can flow stably in a predetermined direction.

[0093] Furthermore, according to the leg joint 100, the pair of ribs 62 are formed to have a uniform thickness, and therefore can be formed efficiently. Furthermore, the leg joint 100 comprises a joint body 20 having a first connection portion which is the first receiving port 201, and an adapter 50 which is attached to the first receiving port 201, and the pair of ribs 62 are formed on the inner surface of the adapter 50, so that the leg joint 100 can be easily constructed.

[0094] <Second embodiment> Hereinafter, a leg joint (joint) and a drainage system (piping structure) according to a second embodiment of the present invention will be described with reference to Figs. FIG. 8 is a longitudinal cross-sectional view including a pipe axis for explaining the schematic configuration of a piping structure according to a second embodiment, FIG. 9 is a front view along the second pipe axis for explaining the schematic configuration of a leg joint, and FIG. 10 is a longitudinal cross-sectional view including the first pipe axis and the second pipe axis.

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

[0096] 8, the drainage system (piping structure) 1A includes, for example, a collective joint 110A, a lower connecting pipe (vertical pipe: straight pipe) 114 connected to a lower vertical pipe connecting portion 111C of the collective 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 generally L-shape in side view, 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 an upper floor is connected to the upper vertical pipe connecting portion 111A of the collective joint 110. That is, the drainage system (piping structure) 1A is configured to include a collective joint 110A and a leg joint 200 instead of the collective joint 110 and the leg joint 100 of the drainage system 1 according to the first embodiment.

[0097] 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 then flows into the horizontal main pipe 120 via the collective joint (pipe joint) 110A, the lower connecting pipe (vertical pipe: straight pipe) 114, and the leg leg joint 200, and the wastewater is discharged outside the building.

[0098] Of the multiple collective joints, as shown in Figure 8, the collective joint 110 for the lowest floor installed on the lowest floor of the building is connected to a lower connecting pipe (vertical pipe: straight pipe) 114 of the second embodiment, a leg joint 200, and a horizontal pipe 120 in that order.

[0099] The joint joint 110A comprises a cylindrical joint pipe main body 111, an upper vertical pipe connection portion 111A formed at the upper end of the joint pipe main body 111, a plurality of branch pipe connection portions 111B formed on the outer surface of the joint pipe main body 111, and a lower vertical pipe connection portion 111C formed at the lower end. In other words, the configuration is such that ribs having inclined portions, such as the backflow prevention rib 112 and the swirl vanes 113, formed on the collective joint 110 according to the first embodiment, are not formed.

[0100] The lower connecting pipe (vertical pipe) 114 is also configured so that it has no ribs or enlarged diameter portions such as the above-mentioned swirl vanes. In other words, the lowest floor joint has no enlarged diameter portions or ribs at all, and the lower connecting pipe 114 made of a pipe without protrusions is connected to the leg joint 200. It is preferable to use a similar configuration for the leg joint 100 and the leg joints of the embodiments described below.

[0101] The collecting joint 110A differs from the collecting joint 110 in that it does not include a backflow prevention rib 112 or a swirl vane 113, and 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 those in the first embodiment, so they are denoted by the same reference numerals and their explanations are omitted. In addition, the adapter 115, vertical packing 116, end treatment member 117, lower connection pipe (vertical pipe) 114, and horizontal main pipe 120 attached to the collecting joint 110A are also the same as those in the first embodiment, so their explanations are omitted.

[0102] The leg joint (joint) 200 includes, for example, a leg joint main body (joint main body) 20A and an adapter 50, as shown in FIGS. The leg joint body (joint body) 20A includes a first socket (first connection portion) 201, a second socket (second connection portion) 202, a curved pipe portion 21A, and a leg body .

[0103] The curved pipe portion 21A is configured such that the curved pipe portion 21 of the leg joint main body 20 according to the first embodiment is provided with, for example, two (a plurality of) cleaning openings 30 on a side surface of the curved pipe portion 21. The cleaning openings 30 are arranged, for example, in curved portions at positions symmetrical to a plane including the first tube axis O1 and the second tube axis on the side surface of the curved pipe portion 21A.

[0104] The opening 30 includes, for example, a circular cleaning hole 31 penetrating from the outside to the inside of the curved pipe portion 21A, and a circular lid member 32 that seals the cleaning hole 31. The cleaning hole 31 has a female thread (not shown) formed on its inner surface, and the cover member 32 has a male thread (not shown) formed on its outer surface. The male thread of the cover member 32 can be engaged with and screwed into the female thread of the cleaning hole 31 to seal the cleaning hole 31. Further, the cover member 32 is formed with, for example, a tool groove 33 for engaging a tool when screwing into the cleaning hole 31.

[0105] The number of cleaning openings 30 can be set arbitrarily, and may be one, or three or more cleaning openings 30 may be provided. The position where the cleaning opening 30 is formed can be set arbitrarily, and it may be formed on the surface of the convex side D1 or the surface of the concave side D2 of the curved pipe portion 21A instead of or in addition to the side surface. Since the rest are the same as those in the first embodiment, the same reference numerals are used and the description is omitted.

[0106] According to the drainage system (piping structure) 1A, no protrusions (backflow prevention ribs, swirl vanes, etc.) are provided in the lowest floor joint, and no enlarged diameter section is provided, but good drainage performance can be ensured.

[0107] Furthermore, according to the drainage system (piping structure) 1A, since the leg joint (joint) 200 is provided with the cleaning opening 30, the inside of the leg joint (joint) 200 can be cleaned easily and efficiently.

[0108] <Third embodiment> Hereinafter, with reference to FIG. 11, a leg joint according to a third embodiment of the present invention will be described. FIG. 11 is a vertical sectional view including a first pipe axis and a second pipe axis for explaining a schematic configuration of a leg joint according to a third embodiment. In FIG. 11, reference numeral 300 denotes a leg joint (joint), and reference numeral 20B denotes a leg joint main body (joint main body).

[0109] As shown in Fig. 11, the leg joint (joint) 300 according to the third embodiment includes, for example, a leg joint main body (joint main body) 20B and an adapter 50. The leg joint (joint) 300 differs from the leg joint (joint) 100 according to the first embodiment in that it includes a leg joint main body (joint main body) 20B instead of the leg joint main body (joint main body) 20. Other aspects are similar to those of the first embodiment, so the same reference numerals are used and the description will be omitted.

[0110] As shown in FIG. 11, in the leg joint 300, for example, an inner circumferential surface 21bA of the curved pipe portion 21B (an end portion of the second inner circumferential surface 20bA on the first socket 201 side) 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 receiving port 201 in the mold is along the inner peripheral surface 21bA of the curved pipe portion 21B. Therefore, the inner peripheral surface 21bA of the curved pipe portion 21B can be formed using the core forming the first receiving port 201.

[0112] <Fourth embodiment> Hereinafter, with reference to FIG. 12, a leg joint according to a fourth embodiment of the present invention will be described. FIG. 12 is a vertical sectional view including a first pipe axis and a second pipe axis for explaining a schematic configuration of a leg joint according to a fourth embodiment. In FIG. 12, reference numeral 400 denotes a leg joint (joint), and reference numeral 20C denotes a leg joint main body (joint main body).

[0113] As shown in Fig. 12, the leg joint (joint) 400 according to the fourth embodiment includes, for example, a leg joint main body (joint main body) 20C and an adapter 50. The leg joint (joint) 400 differs from the leg joint (joint) 100 according to the first embodiment in that it includes a leg joint main body (joint main body) 20C instead of the leg joint main body (joint main body) 20. As the rest are similar to the first embodiment, the same reference numerals are used and the description is omitted.

[0114] As shown in FIG. 12, a leg joint 400 according to the fourth embodiment includes, for example, a first connection line 21aA of a curved pipe portion 21C that is made up of a plurality of connection line segments 24a, 24b, and 24c. The connection line segment 24a and the connection line segment 24b are connected to the concave side D2 at an obtuse angle. Similarly, the connection line segment 24b and the connection line segment 24c, and the connection line segment 24c and the second connection line 22a are each connected to the concave side D2 at an obtuse angle. That is, the connection line segments 24a, 24b, and 24c are formed in a broken line shape. As the first connection line 21aA moves from the first socket 201 side to the second socket 202 side, the direction of the first connection line 21aA intermittently changes from a direction along the first tube axis O1 to a direction intersecting the horizontal plane. The end of connecting line segment 24a opposite to the end connected to connecting line segment 24b is continuous with the inner circumferential surface of first socket 201.

[0115] The acute angle θ4 between the connection line segment 24b and the second tube axis O2 is preferably 40 degrees or 80 degrees. Even if the leg joint 400 is configured, the same effects as those of the leg joint 10 of this embodiment can be achieved. The number of connecting line segments constituting the first connecting line is not limited to three, and may be one, two, or four or more. The first connecting line may be composed of one or more connecting line segments and one or more curved lines.

[0116] <Fifth embodiment> Hereinafter, a leg joint according to a fifth embodiment of the present invention will be described with reference to Figs. FIG. 13 is a front view taken along the second pipe axis for explaining a schematic configuration of a leg joint according to the fifth embodiment, and FIG. 14 is a longitudinal sectional view including the first pipe axis and the second pipe axis. In Fig. 13 and Fig. 14, reference numeral 500 denotes a leg joint (joint), and reference numeral 20D denotes a leg joint main body (joint main body).

[0117] As shown in Figures 13 and 14, the leg joint (joint) 500 according to the fifth embodiment includes, for example, a leg joint body (joint body) 20D and an adapter 50. The leg joint (joint) 500 differs from the leg joint (joint) 100 according to the first embodiment in that it includes a leg joint body (joint body) 20D instead of the leg joint body (joint body) 20. Other elements are similar to those of the first embodiment, so the same reference numerals are used and the description will be omitted.

[0118] 13 and 14, the leg joint body (joint body) 20D has, for example, a protrusion 25 instead of the leg body 23 of the leg joint 100 of the first embodiment. The protrusion 25 is formed on the outer circumferential surface of the convex side D1 of the curved pipe portion 21D. The protrusion 25 is disposed across a position P1 corresponding to the convex side D1 of the first connection line 21a in the curved pipe portion 21D and a position P2 corresponding to the convex side D1 of the second connection line 22a.

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

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

[0121] At position P3 where gate mark 25A or a weld is formed in curved pipe section 21D, there is a risk that the strength of curved pipe section 21D will be reduced; however, by forming gate mark 25A in protrusion 25, the portion of curved pipe section 21D where gate mark 25A is formed can be reinforced by protrusion 25. In addition, since the wastewater W is less likely to hit the position P3 in the curved pipe portion 21D, damage to this position P3 by the wastewater W can be suppressed.

[0122] Sixth embodiment Hereinafter, a leg joint according to a sixth embodiment of the present invention will be described with reference to Figs. FIG. 15 is a front view taken along the second pipe axis for explaining a schematic configuration of a leg joint according to the sixth embodiment, and FIG. 16 is a longitudinal sectional view including the first pipe axis and the second pipe axis. In Fig. 15 and Fig. 16, reference numeral 600 denotes a leg joint (joint), reference numeral 20E denotes a leg joint main body (joint main body), and reference numeral 21E denotes a curved pipe portion.

[0123] As shown in Figures 15 and 16, the leg joint (joint) 600 according to the sixth embodiment includes, for example, a leg joint body (joint body) 20E and an adapter 50. The leg joint (joint) 600 differs from the leg joint (joint) 100 according to the first embodiment in that it includes a leg joint body (joint body) 20E instead of the leg joint body (joint body) 20. Other elements are similar to those of the first embodiment, so the same reference numerals are used and the description is omitted.

[0124] The leg joint body (joint body) 20E includes, for example, a curved pipe portion 21E, a first socket (first connection portion) 201, and a second socket (second connection portion) 202, as shown in FIGS. Furthermore, a tubular body 22E is formed on the second socket (second connection portion) 202 side of the curved pipe portion 21E. In a cross-sectional view including the first pipe axis O1 and the second pipe axis O2, the leg joint main body (joint main body) 20E has an end portion of the second connection line 22a of the tubular body 22E on the second receiving port 202 side that is positioned on the concave side D2 relative to the inner surface of the convex side D1 of the second receiving port 202. The distance between the end of the concave side D2 on the second receiving port 202 side of the second inner circumferential surface 22b of the curved pipe portion 21E and the second pipe axis O2 of the second receiving port 202 and the inner circumferential surface of the concave side D2 of the second receiving port 202 is equal to each other.

[0125] A step 202E formed on the inner circumferential surface of the connection portion between the tubular body 22E and the second receiving port 202 is not formed on the concave side D2 side portion (upper side) of the second receiving port 202, but is formed on the convex side D1 side portion (lower side) of the second receiving port 202. For this reason, the second tube axis O2 and the central axis of the horizontal tube 120 are not aligned in the vertical direction (the direction of the first tube axis O1) but are misaligned.

[0126] The horizontal pipe 120 is locked in the direction of the second pipe axis O2 by a step on the convex side D1 of the second receiving port 202. An internal space is formed extending along the second pipe axis O2 toward the curved pipe section 21E from the concave side D2 at the end of the horizontal pipe 120, forming a ventilation section V that allows air to flow inside the curved pipe section 21E. In the leg joint 600, the step portion 202E can lock the horizontal pipe 120 in the direction along the second pipe axis O2. Furthermore, since the ventilation portion V is formed in the leg joint 600, air can flow through the ventilation portion V when the wastewater W flows through the bent portion 35, so that the wastewater W can easily flow through the bent portion 35. EXAMPLES

[0127] An embodiment of the present invention will be described below with reference to a table shown in Fig. 17 (hereinafter, also referred to as Table 1). Fig. 17 (Table 1) is a table for explaining an embodiment of the present invention. In the examples, the effects were confirmed using Comparative Examples 1 and 2 and an example of the present invention. Comparative Example 1, as shown in FIG. 17 (Table 1), is configured with one vertical rib that is arranged in parallel to the left and right and extends in the up and down direction. Comparative Example 2 is configured with a generally mountain-shaped rib whose left and right faces are inclined outwardly toward each other as they extend downward. The present invention example is configured by a pair of ribs formed in a substantially V-shape of the katakana character according to the first embodiment. The protruding height of the rib is 15 mm, and the width, projected from the first tube axis, is 36 mm.

[0128] In the examples, water was allowed to flow at a discharge rate of 6.5 l / s in each of the comparative examples 1 and 2 and the 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). The evaluation was made with a grade of "○" or "×" based on the pressure inside the pipe, which was set at 400 (Pa) as the standard.

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

[0130] The present invention is not limited to the above-described embodiment, and various modifications (for example, changes in configuration, combinations, deletions, etc.) are possible 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 main body (joint main body) and an adapter 50, and a pair of ribs 62 are formed on the adapter 50, but, for example, the pair of ribs 62 may be formed integrally with the leg joint (main body) 10.

[0132] In the above embodiment, the adapter 50 is described as including the adapter body 51, the elastic ring 52, and the fixing member 53, but the configuration of the adapter 50 can be set arbitrarily.

[0133] In the above embodiment, the pair of ribs 62 are formed in a shape that is roughly the Japanese katakana letter V. However, the configuration of the pair of ribs can be set arbitrarily. For example, the pair of ribs may be formed in a shape that is an upside-down V, 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, ribs that expand outwardly toward each other as they extend downward may be provided on the outer side of either or both of the pair of ribs 62, so that, for example, when viewed from the first tube axis O1 side, multiple rib pieces are arranged in a V-shape on the inner and outer sides.

[0135] In the above embodiment, the pair of ribs 62 are formed symmetrically with respect to the plane including the first tube axis O1, but it is possible to arbitrarily set whether or not the pair of ribs 62 are formed symmetrically with respect to the plane including the first tube axis O1. Also, various dimensions of the rib 62 can be arbitrarily set.

[0136] In the above embodiment, the pair of ribs 62 are offset away from the first pipe axis O1 when viewed from the base end located on the inner circumferential surface side of the leg joint main body 20 to the tip end, but for example, the tip end may be formed toward the pipe axis O1, or the tip end may be formed to intersect with 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] In the above embodiment, the ribs 62 are formed in a flat plate shape, but the ribs 62 may be formed so that the inclination with respect to the first tube axis O1 becomes gradually smaller (convex toward each other's pair of ribs) as they are spaced apart from each other, or the inclination with respect to the first tube axis O1 becomes gradually larger (convex toward each other's pair of ribs) as they are spaced apart from each other. Also, only one of the pair of ribs 62 may be formed in a flat plate shape.

[0138] In the above embodiment, the main wall portion of the rib 62 is formed to have a uniform thickness, but 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 where the pair of ribs approach each other in the circumferential direction may be formed to be thicker than the side where they are separated, or the side where the pair of ribs approach each other in the circumferential direction may be formed to be thinner than the side where they are separated. Also, only one of the pair of ribs 62 may be formed to have a uniform thickness.

[0139] Furthermore, in the above embodiment, in the drainage system (piping structure) 1, it is possible to arbitrarily set whether to form an enlarged diameter section or a straightening vane in the lower connecting pipe (vertical pipe) 114 and the centralized piping 111, and for example, the lower connecting pipe (vertical pipe) 114 and the centralized piping 111 may be configured to have either an enlarged diameter section or a swirling vane 113, or both.

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

[0141] In the above embodiment, the first connection part of the leg joint is a socket (first socket) 201, but the first connection part is not limited to a socket and can be set arbitrarily, and for example, the first connection part may be configured as a socket or a flange, etc. The same applies to the second connection part.

[0142] In addition, within the scope of the invention, it is possible to replace the components in the above-described embodiments with well-known components, and the above-described embodiments may be combined as appropriate. [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 (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 Rib (pair of ribs) O1 1st tube axis O2 2nd tube shaft

Claims

1. A joint having a first connection portion to which a vertical pipe is connected, a second connection portion to which a horizontal pipe is connected, and a curved pipe portion connecting the first connection portion and the second connection portion, and having a protrusion on an outer surface of the curved pipe portion, A water film cutting means is provided, The water film cutting means is a pair of ribs formed on a side of the first connection portion where the second connection portion is disposed in the circumferential direction, extending along a first pipe axis of the first connection portion, and protruding inward from an inner peripheral surface; The pair of ribs are A joint in which the pair of ribs are arranged at a circumferential distance from each other, the circumferential distance between the outer sides of the pair of ribs increasing or decreasing as they extend downward, and the joint is formed so as to protrude relative to the inner surface of the vertical pipe.

2. 2. The joint of claim 1, A joint in which the pair of ribs are formed so that they protrude from the inner peripheral surface of the vertical pipe by 5 mm or more, and have a circumferential width dimension when viewed along the first pipe axis of 5 mm or more.

3. 3. The joint according to claim 1 or 2, The pair of ribs are A joint in which the distance between opposing inner circumferential sides increases downward.

4. The joint according to any one of claims 1 to 3, The pair of ribs are The joint is formed so as to be offset away from the first pipe axis when viewed from the base end located on the inner peripheral surface side to the tip end side.

5. The joint according to any one of claims 1 to 4, The pair of ribs are 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 connection portion to which a vertical pipe is connected, a second connection portion to which a horizontal pipe is connected, and a curved pipe portion connecting the first connection portion and the second connection portion, and having a protrusion on an outer surface of the curved pipe portion, the adapter being disposed between the first connection portion and the vertical pipe, the first connection portion being a first socket of a fitting body, An adapter that constitutes the joint according to any one of claims 1 to 6 by being placed on the joint body.

8. A joint according to any one of claims 1 to 6; a vertical pipe connected to the first connection portion; and a horizontal pipe connected to the second connection portion. A piping structure comprising:

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