JP7748992B2 - Joint structures, drainage systems, and buildings - Google Patents

Description

The present invention relates to a joint structure, a drainage system, and a building .

Joints for connecting a vertical pipe and a horizontal pipe have been known for some time, such as those described in Patent Document 1 below.

Japanese Patent Application Laid-Open No. 2004-116732

However, with the conventional fittings mentioned above, it is necessary to prepare a fitting for each standpipe size.

The present invention was made in consideration of the above-mentioned circumstances, and aims to make fittings compatible with standpipes of various sizes.

In order to solve the above problems, the present invention proposes the following means.
The adapter of the present invention is used in a joint having a first end portion into which a standpipe is disposed, a second end portion into which a horizontal pipe is attached, and a curved pipe portion connecting the first end portion and the second end portion, and is an adapter disposed between the standpipe and the first end portion, and comprises: a main body portion disposed within the first end portion and supported by a first step portion connecting the first end portion and the curved pipe portion, and into which the standpipe is disposed; and a straightening portion protruding from the main body portion and disposed within the curved pipe portion.

The main body is disposed within the first end, and the standpipe is disposed within the main body. Therefore, even if the standpipe has a smaller diameter than the first end, the standpipe can be attached to the first end via an adapter. As a result, the same fitting can be used for standpipes of various sizes. This can reduce capital investment, such as for molds.
The use of an adapter allows a smaller diameter standpipe to be used with the fitting, as described above. In this case, when wastewater is discharged from the standpipe to the fitting, the area into which the wastewater is discharged can be contained within the area projected by the internal space of the standpipe in a top view of the fitting. This makes it easier to ensure a space (air layer) within the fitting that is not filled with wastewater. If the fitting is filled with wastewater, negative pressure tends to develop within the standpipe when the wastewater is discharged from the fitting at high speed, while positive pressure tends to develop within the standpipe when the wastewater is discharged from the fitting at low speed. Therefore, by ensuring an air layer within the fitting when draining from the standpipe, unexpected negative or positive pressure within the standpipe can be suppressed. As a result, when the standpipe includes, for example, a so-called manifold joint to which the first end of a horizontal pipe is connected, seal failure can be suppressed in the drainage equipment to which the second end of the horizontal pipe is connected.
The main body is supported by the first step of the joint. Therefore, the main body of the adapter can be supported from below by the first step of the joint, and for example, the adapter and the standpipe can be stably supported by the joint.
The flow straightening section protrudes from the main body and is positioned within the curved pipe section. Therefore, even if the wastewater flowing down the standpipe forms a swirling flow, the flow straightening section can straighten the swirling flow, making it easier to control the behavior of the wastewater. This ensures good drainage performance of the joint.
The flow straightening unit is provided in the adapter, not the fitting. Therefore, even if the standpipe has a smaller diameter than the first end, as described above, it is easy to appropriately adjust the positional relationship between the standpipe and the flow straightening unit. That is, when the flow straightening unit is provided in the fitting and the standpipe has a smaller diameter than the first end, for example, depending on the position within the first end where the standpipe is located, the wastewater flowing down from the standpipe may be too far away from the flow straightening unit. In this case, the flow straightening unit may not sufficiently straighten the wastewater, and the drainage performance of the fitting may not be ensured.

The device may further include an elastic ring disposed within the main body and into which the standpipe is fitted, and a restricting member attached to the main body and restricting the elastic ring from coming off the main body.

An elastic ring is disposed within the main body, and the standpipe is fitted within the elastic ring, thereby preventing unexpected leakage of wastewater flowing from the standpipe into the fitting.
The restricting member is attached to the main body and restricts the elastic ring from coming off the main body, so that the effect of suppressing leakage of the drainage water can be reliably achieved simply by attaching the restricting member to the main body.

The joint structure of the present invention comprises a joint having a first end portion into which a vertical pipe is placed, a second end portion into which a horizontal pipe is attached, and a curved pipe portion connecting the first end portion and the second end portion, and the adapter.

The joint structure of the present invention comprises a joint having a first end portion into which a vertical pipe is placed, a second end portion into which a horizontal pipe is attached, and a curved pipe portion connecting the first end portion and the second end portion, and the adapter, and the restricting member is placed within the first end portion.

The restricting member is positioned within the first end. Therefore, the restricting member can be covered and protected by the first end. This makes it possible, for example, for the first end to shield the restricting member from unexpected external forces, thereby preventing the restricting member from unexpectedly coming loose.

The curved pipe portion may include a second pipe portion extending from the second end portion in the axial direction of the second end portion, and the flow straightening portion may be located above the apex of the second pipe portion.

The flow straightening section is located above the top of the second pipe section. Therefore, for example, when wastewater flows through the second pipe section, the flow of this wastewater can be prevented from being obstructed by the flow straightening section.

The present invention allows fittings to be used with standpipes of various sizes.

This is a cross-sectional view along the vertical direction of a drainage system according to one embodiment of the present invention, showing the vertical main pipe and the horizontal main pipe as viewed from the side. FIG. 2 is a cross-sectional view of the joint structure shown in FIG. 1 taken along the vertical direction. FIG. 3 is a cross-sectional view showing a main part of the joint structure shown in FIG. 2 . 3 is a cross-sectional view of a main body member (adapter main body) that constitutes the joint structure shown in FIG. 2. FIG. 5 is a plan view of the main body member (adapter main body) shown in FIG. 4 . 3 is a cross-sectional view of an adapter that constitutes the joint structure shown in FIG. 2. 3A to 3C are cross-sectional views illustrating a manufacturing method of the joint structure shown in FIG. 2. FIG. 10 is a cross-sectional view along the vertical direction of a joint structure according to a first modified example of the present invention. FIG. 10 is a cross-sectional view along the vertical direction of a joint structure according to a second modified example of the present invention. FIG. 10 is a cross-sectional view along the vertical direction of a joint structure according to a third modified example of the present invention. FIG. 10 is a cross-sectional view along the vertical direction of a joint structure according to a fourth modified example of the present invention. FIG. 13 is a cross-sectional view taken along the vertical direction of a main body member (adapter main body) constituting a joint structure according to a fifth modified example of the present invention. FIG. 13 is a plan view of the main body member (adapter main body) shown in FIG. 12 . FIG. 13 is a cross-sectional view taken along the vertical direction of a main body member (adapter main body) constituting a joint structure according to a sixth modified example of the present invention. FIG. 15 is a plan view of the main body member (adapter main body) shown in FIG. 14 . FIG. 15 is a front view of the main body member (adapter main body) shown in FIG. 14 . FIG. 13 is a cross-sectional view taken along the vertical direction of a main body member (adapter main body) constituting a joint structure according to a seventh modified example of the present invention. FIG. 18 is a plan view of the main body member (adapter main body) shown in FIG. 17. FIG. 18 is a rear view of the main body member (adapter main body) shown in FIG. 17. 18 is a perspective view of the main body member (adapter main body) shown in FIG. 17 as viewed from the second side and obliquely below. FIG. FIG. 13 is a cross-sectional view taken along the vertical direction of a main body member (adapter main body) constituting a joint structure according to an eighth modified example of the present invention. 22 is a perspective view of the main body member (adapter main body) shown in FIG. 21 as viewed from the first side and diagonally below. FIG. 22 is a perspective view of the main body member (adapter main body) shown in FIG. 21 as viewed from the second side and obliquely below. FIG. FIG. 22 is a bottom view of the main body member (adapter main body) shown in FIG. 21 . FIG. 13 is a cross-sectional view taken along the vertical direction of a main body member (adapter main body) constituting a joint structure according to a ninth modified example of the present invention. 26 is a perspective view of the main body member (adapter main body) shown in FIG. 25 as viewed from the first side and obliquely below. FIG. 26 is a perspective view of the main body member (adapter main body) shown in FIG. 25 as viewed from the second side and obliquely below. FIG. FIG. 26 is a bottom view of the main body member (adapter main body) shown in FIG. 25 . FIG. 23 is a cross-sectional view taken along the vertical direction of a main body member (adapter main body) constituting a joint structure according to a tenth modified example of the present invention. 30 is a perspective view of the main body member (adapter main body) shown in FIG. 29 as viewed from the first side and diagonally below. FIG. 30 is a perspective view of the main body member (adapter main body) shown in FIG. 29 as viewed from the second side and obliquely below. FIG. FIG. 30 is a bottom view of the main body member (adapter main body) shown in FIG. 29 . FIG. 23 is a cross-sectional view taken along the vertical direction of a main body member (adapter main body) constituting a joint structure according to an eleventh modified example of the present invention. 34 is a perspective view of the main body member (adapter main body) shown in FIG. 33 as viewed from the first side and diagonally below. FIG. 34 is a perspective view of the main body member (adapter main body) shown in FIG. 33 as viewed from the second side and obliquely below. FIG. FIG. 34 is a bottom view of the main body member (adapter main body) shown in FIG. 33. 1 is a cross-sectional view along the vertical direction of a joint structure according to a first embodiment of the present invention; FIG. 10 is a cross-sectional view along the vertical direction of a joint structure according to a second embodiment of the present invention.

Below, a drainage system according to one embodiment of the present invention will be described with reference to Figures 1 to 7. As shown in Figure 1, the drainage system 10 is applied to a multi-story building (building) such as a high-rise apartment building or commercial building. In this type of building, wastewater discharged from sanitary equipment (drainage equipment) on each floor, such as toilets, vanities, and sinks, flows into the vertical main pipe 20 of the drainage channel via a horizontal branch pipe. The vertical main pipe 20 is installed to pass through each floor (floor slab S). The wastewater flows down along the vertical main pipe 20 to the lowest floor of the multi-story building, then flows into the horizontal main pipe 30 via a leg joint 50 connected to the bottom end of the vertical main pipe 20, and is ultimately sent to a main sewer pipe, a septic tank, or the like. The drainage system 10 discharges wastewater from the drainage equipment on each floor to the outside of the building.

The drainage system 10 comprises a vertical main pipe 20 (vertical pipe), a horizontal main pipe 30 (horizontal pipe), and a joint structure 40.
The vertical main pipe 20 collects and directs the wastewater from the drainage equipment installed on each floor downward. The vertical main pipe 20 includes a plurality of collecting joints 21 provided for each floor, and a first pipe (not shown) that connects the collecting joints 21 arranged on adjacent floors in the vertical direction.
Of the multiple joints 21, the joint 21 for the lowest floor provided on the lowest floor of the building has a branch pipe connection portion 22 and a slab penetration portion 23.

The branch pipe connection part 22 is located above the floor slab S. A horizontal branch pipe (not shown) is connected to the branch pipe connection part 22. The horizontal branch pipe directs wastewater discharged from the drainage equipment to the branch pipe connection part 22. Part or all of the branch pipe connection part 22 may be transparent. In this case, the wastewater flowing from the horizontal branch pipe into the branch pipe connection part 22 can be seen from the outside.

The slab penetration portion 23 extends downward from the branch pipe connection portion 22. The slab penetration portion 23 is formed in a cylindrical shape extending in the vertical direction. The slab penetration portion 23 penetrates the floor slab S in the vertical direction. The lower end of the slab penetration portion 23 protrudes downward from the floor slab S. The nominal diameter of the slab penetration portion 23 (vertical main pipe 20) is, for example, approximately 75 to 125 mm.

The slab penetration 23 may also be thermally expandable. In this case, even if a fire breaks out on one of the multiple floors, the slab penetration 23 will expand, blocking the interior of the vertical main pipe 20. This prevents flames from reaching the floors above or below the floor where the fire broke out through the interior of the vertical main pipe 20. The slab penetration 23 is typically constructed in a tubular shape from a metal such as cast iron or a resin such as polyvinyl chloride. In the case of resin, it may be formed from a multi-layer pipe. In this case, a configuration can be adopted that includes inner and outer layers made of polyvinyl chloride resin, and an intermediate layer containing polyvinyl chloride resin and thermally expandable graphite.

The horizontal main pipe 30 guides the wastewater that has flowed through the vertical main pipe 20 horizontally and discharges it outside the premises. The horizontal main pipe 30 includes a second pipe 31 and a cleaning joint 32. The second pipe 31 is connected to a joint structure 40. The nominal diameter of the second pipe 31 (horizontal main pipe 30) may be, for example, approximately 100 to 150. The nominal diameter of the horizontal main pipe 30 may be larger than the nominal diameter of the vertical main pipe 20.
The cleaning joint 32 is arranged on the opposite side of the joint structure 40, with the second pipe 31 sandwiched therebetween. The cleaning joint 32 has a cleaning port 33 formed therein. A lid 34 is detachably attached to the cleaning port 33. Part or all of the cleaning joint 32 may be transparent. In this case, the wastewater flowing from the second pipe 31 into the cleaning joint 32 can be seen from the outside.

1 to 6 , the joint structure 40 connects the vertical main pipe 20 and the horizontal main pipe 30. The joint structure 40 includes a leg joint 50 (joint) and an adapter 70.
As shown in Figures 1 and 2, the leg joint 50 has a first end 51 in which the vertical main pipe 20 is disposed, a second end 52 in which the horizontal main pipe 30 is attached, and a curved pipe portion 53 connecting the first end 51 and the second end 52. The first end 51 is a socket into which the vertical main pipe 20 is inserted. The lower end of the slab penetration portion 23 is attached to the first end 51. The second end 52 is a socket into which the horizontal main pipe 30 is inserted. The second pipe 31 is fitted into the second end 52. The outer peripheral surface of the second pipe 31 is bonded to the inner peripheral surface of the second end 52.

As shown in FIG. 2, the second end 52 is offset in one horizontal direction, D, relative to the first end 51. Hereinafter, the direction in which the second end 52 is positioned relative to the first end 51 along direction D will be referred to as the first side D1, and the opposite side of direction D will be referred to as the second side D2. When the axis of the first end 51 (hereinafter referred to as the first axis O1) is arranged parallel to the vertical direction, the axis of the second end 52 (hereinafter referred to as the second axis O2) has a drainage gradient that slopes downward as it approaches the first side D1. The first axis O1 and the second axis O2 intersect with each other. The distance L1 from the upper edge of the first end 51 to the intersection X of the axes O1 and O2 may be 200 mm or less.

The curved pipe portion 53 includes a first pipe portion 54 extending from the first end portion 51 in the axial direction (downward) of the first end portion 51, a second pipe portion 55 extending from the second end portion 52 in the axial direction of the second end portion 52, and a connecting portion 56 connecting the first pipe portion 54 and the second pipe portion 55.
The first pipe portion 54 has a smaller diameter than the first end portion 51. The first end portion 51 and the first pipe portion 54 are connected via a first step portion 57.

The second pipe portion 55 has a smaller diameter than the second end portion 52. The second end portion 52 and the second pipe portion 55 are connected via a second step portion 58. The end of the pipe top 55a of the second pipe portion 55 located on the second side D2 is directly connected to the part of the lower end of the first pipe portion 54 located on the first side D1.
The connecting portion 56 connects the first pipe portion 54 and the second pipe portion 55 over the entire circumference, except for the portion where they are directly connected as described above. A supported portion 59 that protrudes downward is provided on the connecting portion 56. The supported portion 59 is supported by, for example, a support bracket (not shown).

The leg joint 50 may be made of a resin such as vinyl chloride, and it is particularly preferable to use a resin that has 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-modified resins, (2) resins obtained by graft copolymerization of polyvinyl chloride polymers with impact-modified 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 copolymerization of vinyl chloride with (co)polymers other than vinyl chloride. These (1) to (4) may be used alone or in combination of two or more. Furthermore, the polyvinyl chloride resins may be chlorinated as needed.

Examples of the impact-modifying resin to be mixed with the polyvinyl chloride polymer in (1) above, and the impact-modifying resin to be graft-copolymerized with the polyvinyl chloride polymer in (2) above, include resins with rubber properties. Specific 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 alone, or two or more may be used in combination.

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 leg joint 50 is susceptible to damage because it is directly hit by wastewater falling from the vertical main pipe 20. By using a resin with excellent impact resistance for the leg joint 50, it is possible to prevent the leg joint 50 from being damaged by the impact of the wastewater.

Note that a part or all of the leg joint 50 may be transparent. In this case, the wastewater flowing from the vertical main pipe 20 into the leg joint 50 can be seen from the outside.
Furthermore, it is preferable that the nominal diameter (inner diameter, outer diameter) of the first end 51 is larger than the nominal diameter (inner diameter, outer diameter) of the horizontal main pipe 30 (second piping 31). In this case, even if a vertical main pipe 20 (slab penetration portion 23) with the largest nominal diameter is installed inside the first end 51, the drainage capacity of the horizontal main pipe 30 can be ensured to be equal to or greater than the drainage capacity of the vertical main pipe 20. As a result, the drainage capacity of the entire drainage system 10 can be maintained.

Furthermore, it is preferable that the leg joint 50 has a greater wall thickness than the vertical main pipe 20 and the horizontal main pipe 30. In particular, it is preferable that the curved pipe portion 53 (first pipe portion 54, second pipe portion 55, and connection portion 56) constituting the leg joint 50 has a greater wall thickness, and specifically, the wall thickness of the curved pipe portion 53 is set to 5 mm or more, and preferably 6 mm or more.
As mentioned above, the leg joint 50 is directly hit by the wastewater falling from the vertical main pipe 20, but by increasing the thickness of the curved pipe section 53, it is possible to prevent the leg joint 50 from being damaged due to the impact of the wastewater.

As shown in Figures 2 and 3, the adapter 70 is positioned between the vertical main pipe 20 and the first end 51. In this embodiment, the outer diameter of the vertical main pipe 20 (slab penetration portion 23) is smaller than the outer diameter of the first end 51, and the adapter 70 adjusts the diameter difference between the vertical main pipe 20 and the first end 51. Hereinafter, the radial direction of the adapter 70 will be referred to as the radial direction, and the circumferential direction of the adapter 70 will be referred to as the circumferential direction.

The adapter 70 includes an adapter body 71 , an elastic ring 72 , and a restricting member 73 .
The adapter main body 71 includes a main body portion 75 and a flow rectifying portion 76. The main body portion 75 is disposed within the first end portion 51 and is supported by the first step portion 57. The vertical main pipe 20 (slab penetration portion 23) is disposed within the main body portion 75. As shown in FIG. 3 , the main body portion 75 includes a ring portion 77 and a first cylindrical portion 78.

The components of the adapter 70, excluding the elastic ring 72, may be formed from vinyl chloride resin, for example, from a resin such as vinyl 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-modified resins, (2) resins obtained by graft copolymerization of polyvinyl chloride polymers with impact-modified 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 copolymerization of vinyl chloride with (co)polymers other than vinyl chloride. These (1) to (4) may be used alone or in combination of two or more. Furthermore, the polyvinyl chloride resins may be chlorinated as needed.

Examples of the impact-modifying resin to be mixed with the polyvinyl chloride polymer in (1) above, and the impact-modifying resin to be graft-copolymerized with the polyvinyl chloride polymer in (2) above, include resins with rubber properties. Specific 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 alone, or two or more may be used in combination.

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 70 has a complex structure and is easily damaged. However, by using a resin with excellent impact resistance for the adapter 70, it is possible to prevent the adapter 70 from being damaged, for example, when the joint structure 40 is accidentally dropped.

The ring portion 77 is fitted (tightly fitted) into the first end portion 51. As shown in Fig. 2, the axis of an opening 77a on the inside of the ring portion 77 is shifted toward the second side D2 with respect to the first axis O1 of the first end portion 51. The opening 77a is eccentric with respect to the first end portion 51. As shown in Fig. 3, the ring portion 77 includes a thick portion 79 and a thin portion 80.
The thick-walled portion 79 is the outer periphery of the ring portion 77, and the thin-walled portion 80 is the inner periphery of the ring portion 77. The thick-walled portion 79 and the thin-walled portion 80 are arranged continuously in the radial direction. The thickness of the thin-walled portion 80 (the thickness along the axial direction of the adapter 70) is thinner than the thickness of the thick-walled portion 79.

The upper surface of the thin portion 80 is connected via a step to the upper surface of the thick portion 79. The lower surface of the thin portion 80 is smoothly connected to the lower surface of the thick portion 79 without any step.
2, the length in one direction D of the portion of the thick portion 79 located on the first side D1 is longer than the length in one direction D of the portion of the thin portion 80 located on the first side D1 and the length in one direction D of the portion of the thin portion 80 located on the second side D2 are equal to each other.

As shown in FIG. 3, the first cylindrical portion 78 extends upward from the ring portion 77. The first cylindrical portion 78 is disposed on the inner peripheral edge of the thick-walled portion 79. The first cylindrical portion 78 is disposed coaxially with the opening 77a of the ring portion 77. A ridge 81 is provided on the outer peripheral surface of the first cylindrical portion 78. The ridge 81 is provided at the upper end of the first cylindrical portion 78. The ridge 81 is provided continuously around the entire circumferential direction.

As shown in FIG. 2, the flow rectifying section 76 protrudes from the main body section 75 and is disposed within the curved pipe section 53. The flow rectifying section 76 protrudes downward from the thin-walled section 80 and is disposed within the first pipe section 54. The flow rectifying section 76 is located above the pipe apex 55a of the second pipe section 55. In other words, the flow rectifying section 76 is disposed exclusively within the first pipe section 54 and is not disposed within the connecting section 56.

As shown in Figures 4 and 5, the flow rectifying portion 76 includes a plate portion 82 and a protrusion portion 83. The plate portion 82 extends in the circumferential direction. The upper end of the plate portion 82 is connected to the underside of the ring portion 77. The plate portion 82 is arranged only in the portion of the ring portion 77 that is located on the first side D1. In other words, the plate portion 82 is not arranged around the entire circumference of the ring portion 77.

The protrusions 83 protrude radially inward from the plate portion 82. As shown in FIG. 5, multiple protrusions 83 are arranged at intervals in the circumferential direction. In the illustrated example, the protrusions 83 are arranged at both circumferential ends of the plate portion 82. As shown in FIG. 4, the amount of protrusion of the protrusions 83 radially inward increases from top to bottom and then decreases. The portion of the protrusion 83 with the greatest amount of protrusion radially inward is located above the vertical center of the protrusion 83. When viewed from the side in the circumferential direction, the protrusions 83 have a curved shape that is convex radially inward.

As shown in Fig. 3, the elastic ring 72 is formed of an elastic material such as rubber. The elastic ring 72 is disposed within the main body 75. The main vertical pipe 20 is fitted into the elastic ring 72. The elastic ring 72 includes a main ring 84, a first convex portion 85, and a second convex portion 86.
The main body ring 84 is tightly fitted inside the first cylindrical portion 78. The inner diameter of the main body ring 84 is larger than the inner diameter of the ring portion 77 (the diameter of the opening 77a).

The first protrusion 85 and the second protrusion 86 are provided on the inner circumferential surface of the main ring 84. The first protrusion 85 and the second protrusion 86 are provided continuously over the entire circumference in the circumferential direction.
The first protrusion 85 is provided at the lower end of the main ring 84. The inner diameter of the first protrusion 85 is equal to the inner diameter of the ring portion 77. The first protrusion 85 is supported from below by the ring portion 77. The upper surface of the first protrusion 85 abuts against the lower end surface of the vertical main pipe 20 (slab penetration portion 23).

The second convex portion 86 is provided at the upper end of the main ring 84. The second convex portion 86 extends downward as it moves radially inward. The inner diameter of the second convex portion 86 is smaller than the outer diameter of the vertical main pipe 20 (slab penetration portion 23). The vertical main pipe 20 inserted into the elastic ring 72 elastically deforms the second convex portion 86 downward and radially outward. As a result, the second convex portion 86 comes into tight contact (pressed) with the vertical main pipe 20 around its entire circumference, ensuring a seal between the elastic ring 72 and the vertical main pipe 20.

The restricting member 73 is attached to the main body portion 75 and restricts the elastic ring 72 from coming off the main body portion 75. The restricting member 73 is disposed within the first end portion 51. The restricting member 73 includes a second cylindrical portion 87 and a flange portion 88.
The second cylindrical portion 87 is fitted (tightly fitted) from the outside into the first cylindrical portion 78. In this embodiment, the second cylindrical portion 87 is disposed between the first cylindrical portion 78 and the first end portion 51. The second cylindrical portion 87 is fitted (tightly fitted) into the first end portion 51. The lower end surface of the second cylindrical portion 87 is spaced from the upper surface of the thick-walled portion 79.

The flange portion 88 protrudes radially inward from the upper end of the second cylindrical portion 87. The flange portion 88 covers the first cylindrical portion 78 and the main body ring 84 from above. The lower surface of the flange portion 88 abuts against the upper end surfaces of the first cylindrical portion 78 and the main body ring 84. The adapter 70 (particularly the adapter main body 71 and the restricting member 73) may be transparent for visibility.

In this drainage system 10, when assembling the adapter 70 to the leg joint 50, first, as shown in Figure 6, the adapter body 71, elastic ring 72 and regulating member 73 are combined to form the adapter 70 outside the leg joint 50.
7 , the adapter 70 is fitted into the first end portion 51. In this embodiment, in the portion of the adapter 70 located on the second side D2, the size L2 of the thick-walled portion 79 along the direction D is larger than the size L3 along the direction D between the inner circumferential surfaces of the first cylindrical portion 78 and the second cylindrical portion 87. Therefore, when fitting the adapter 70 into the first end portion 51, the restricting member 73 is prevented from unexpectedly coming off the main body portion 75, for example, when the restricting member 73 hits the upper end surface of the first end portion 51.

As described above, with the joint structure 40 and adapter 70 according to this embodiment, the main body 75 is positioned within the first end 51, and the vertical main pipe 20 is positioned within the main body 75. Therefore, even if the vertical main pipe 20 has a smaller diameter than the first end 51, the vertical main pipe 20 can be attached to the first end 51 via the adapter 70. As a result, the same leg joint 50 can be applied to vertical main pipes 20 of various sizes. This makes it possible to reduce capital investment in molds, etc., for example.

By using the adapter 70, a small-diameter vertical pipe 20 can be used relative to the leg joint 50, as described above. In this case, when wastewater is discharged from the vertical pipe 20 to the leg joint 50, the area into which the wastewater is discharged within the leg joint 50 can be contained within the area onto which the internal space of the vertical pipe 20 is projected when the leg joint 50 is viewed from above. This makes it easier to ensure a space (air layer) within the leg joint 50 that is not filled with wastewater. Here, if the leg joint 50 is filled with wastewater, negative pressure is likely to occur within the vertical pipe 20 if the wastewater is discharged from the leg joint 50 at high speed, while positive pressure is likely to occur within the vertical pipe 20 if the wastewater is discharged from the leg joint 50 at low speed. Therefore, by ensuring an air layer within the leg joint 50 when draining water from the vertical pipe 20, unexpected negative or positive pressure within the vertical pipe 20 can be prevented. As a result, when the vertical main pipe 20 includes a so-called manifold joint 21 to which the first end of the horizontal branch pipe is connected, as in this embodiment, seal failure can be prevented in the drainage equipment to which the second end of the horizontal branch pipe is connected.

The main body 75 is supported by the first step 57 of the leg joint 50. Therefore, the main body 75 of the adapter 70 can be supported from below by the first step 57 of the leg joint 50, allowing, for example, the adapter 70 and the vertical main pipe 20 to be stably supported by the leg joint 50.

The flow straightening section 76 protrudes from the main body section 75 and is positioned within the curved pipe section 53. Therefore, even if the wastewater flowing down the vertical main pipe 20 forms a swirling flow, the flow straightening section 76 can straighten the swirling flow, making it easier to control the behavior of the wastewater. This ensures good drainage performance of the leg joint 50.

The rectifying section 76 is provided on the adapter 70, not the leg joint 50. Therefore, even if the vertical main pipe 20 has a smaller diameter than the first end 51, as described above, it is easy to appropriately adjust the positional relationship between the vertical main pipe 20 and the rectifying section 76. That is, when the rectifying section 76 is provided on the leg joint 50 and the vertical main pipe 20 has a smaller diameter than the first end 51, for example, depending on the position within the first end 51 where the vertical main pipe 20 is located, there is a risk that the wastewater flowing down from the vertical main pipe 20 will be too far away from the rectifying section 76. In this case, the rectifying section 76 will not sufficiently rectify the wastewater, and the drainage performance of the leg joint 50 may not be ensured.

The flow straightening section 76 is located above the pipe top 55a of the second pipe section 55. Therefore, for example, when wastewater flows through the second pipe section 55, the flow of this wastewater can be prevented from being obstructed by the flow straightening section 76.

An elastic ring 72 is placed inside the main body 75, and the vertical main pipe 20 is fitted into the elastic ring 72. This prevents unexpected leakage of wastewater from the vertical main pipe 20 into the leg joint 50.

The restricting member 73 is attached to the main body 75 and restricts the elastic ring 72 from coming off the main body 75. Therefore, the aforementioned effect of suppressing drainage leakage can be reliably achieved simply by attaching the restricting member 73 to the main body 75.

The restricting member 73 is positioned within the first end 51. Therefore, the restricting member 73 can be covered and protected by the first end 51. This makes it possible, for example, for the first end 51 to block the restricting member 73 from being subjected to unexpected external forces, thereby preventing the restricting member 73 from unexpectedly coming loose.

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

For example, as in the joint structure 40A according to the first modified example shown in Figure 8, the opening 77a may be smaller in diameter than the opening 77a of the joint structure 40 according to the embodiment shown in Figure 2. In this case, the nominal diameters (inner diameter, outer diameter) of the vertical main pipe 20 are also smaller than the nominal diameters (inner diameter, outer diameter) of the vertical main pipe 20 of the joint structure 40 according to the embodiment.

The second pipe portion 55 may be short, as in the joint structure 40B according to the second modified example shown in FIG. 9 and the joint structure 40C according to the third modified example shown in FIG. 10. In the joint structure 40B according to the second modified example shown in FIG. 9, the second pipe portion 55 is shorter than the second pipe portion 55 according to the embodiment shown in FIG. 2. In the joint structure 40C according to the third modified example shown in FIG. 10, the second pipe portion 55 is shorter than the second pipe portion 55 according to the first modified example shown in FIG. 8.

As in a joint structure 40D according to a fourth modified example shown in FIG. 11, a rotation stopper 90 may be provided between the adapter 70 and the first end portion 51 to restrict relative rotation therebetween.
The anti-rotation device 90 includes a recess 91 and a protrusion 92. In the present embodiment, the recess 91 is formed on the inner circumferential surface of the first end 51 (in the illustrated example, the inner circumferential surface of a portion of the first end 51 located on the second side D2), and the protrusion 92 is formed on the outer circumferential surface of the restricting member 73 (in the illustrated example, the outer circumferential surface of a portion of the restricting member 73 located on the second side D2). The protrusion 92 is fitted into the recess 91. When the adapter 70 attempts to rotate relative to the first end 51, the protrusion 92 engages with the inner surface of the recess 91, thereby restricting the rotation.

As shown in Figures 12 and 13 , the plate portion 82 of the flow rectifying portion 76 may be formed cylindrically and continuously around the entire circumferential direction, as in the adapter body 71A according to the fifth modification. In this case, a plurality of protrusions 83 may be arranged at equal intervals around the entire circumferential direction. Furthermore, this makes it easier to form the air layer between the plate portion 82 and the first pipe portion 54. This effectively prevents seal failure in the drainage system, as described above.
Furthermore, as in the adapter body 71B according to a sixth modification shown in FIGS. 14 to 16 , the vertical size of the plate portion 82 may vary depending on the circumferential position of the plate portion 82. In this adapter body 71B, the plate portion 82 is formed cylindrically, similar to the adapter body 71 according to the fifth modification. Furthermore, a portion of the plate portion 82 located on the first side D1 (hereinafter referred to as the first portion 82a) is larger in the vertical direction than the remaining portion (hereinafter referred to as the second portion 82b). The vertical size of the first portion 82a is at least twice the vertical size of the second portion 82b. The first portion 82a is smaller in the circumferential direction than the second portion 82b. As shown in FIGS. 15 and 16 , the circumferential size of the first portion 82a is approximately ¼ of the entire circumference of the plate portion 82. In other words, the first portion 82a is located within a 90-degree central angle around the axis L of the adapter body 71. The flow rectifying portion 76 further includes a protrusion 89 in addition to the plate portion 82 and the protrusion 83. The protrusion 89 protrudes radially outward from the plate portion 82. The vertical size of the protrusion 89 is equal to the vertical size of the plate portion 82. The upper end of the protrusion 89 is connected to the lower surface of the ring portion 77. The vertical position of the lower end of the protrusion 89 coincides with the vertical position of the lower end of the first portion 82a.

As in the adapter body 71C according to a seventh modified example shown in FIGS. 17 to 20 , the protrusion 83 may be formed in a spiral shape extending around the axis L of the adapter body 71C. The protrusion 83 extends downward from one circumferential side to the other. The one circumferential side is the counterclockwise side around the axis L in a top view of the adapter body 71C as shown in FIG. 18 . The other circumferential side is the clockwise side around the axis L in the top view. The protrusion 83 is formed in a spiral plate shape with a thickness extending vertically. The radial size of the protrusion 83 is small at both circumferential ends of the protrusion 83 and large at the circumferential center of the protrusion 83. Note that the plate portion 82 is not provided around the entire circumferential circumference, but only at a certain portion of the circumferential circumference (the portion located on the first side D1). 19 , the vertical size of the plate portion 82 increases from one side to the other along the circumferential direction. The protrusion 83 is provided at the lower end of the plate portion 82 over its entire length (the entire circumferential length of the lower end).
In this case, the drainage water flowing down from the vertical main pipe 20 into the leg joint 50 can be rectified into a swirling flow by the protrusion 83. As a result, for example, it is possible to ensure an air core on the axis L, and drainage performance can be effectively ensured.

As in the adapter body 71D of the eighth modified example shown in Figures 21 to 24, the adapter body 71E of the ninth modified example shown in Figures 25 to 28, the adapter body 71F of the tenth modified example shown in Figures 29 to 32, and the adapter body 71G of the eleventh modified example shown in Figures 33 to 36, the inclination angle and width of the plate portion 82 may be different from the inclination angle and width of the plate portion 82 in the adapter body 71 according to the above embodiment.

The adapter main body 71D according to the eighth modified example shown in Figures 21 to 24 and the adapter main body 71E according to the ninth modified example shown in Figures 25 to 28 share the same inclination angle θ of the plate portion 82. The inclination angle θ of the plate portion 82 is the angle at which the plate portion 82 (the surface of the plate portion 82 facing the second side D2) is inclined with respect to an imaginary line extending in the up-down direction in a vertical cross section of the adapter main bodies 71D and 71E that includes the axis L and is aligned in one direction D. In both of the adapter main bodies 71D and 71E, the inclination angle θ is 15 degrees.
On the other hand, the adapter main body 71D and the adapter main body 71E have different widths of the plate portion 82. The width of the plate portion 82 refers to the size of the plate portion 82 in the circumferential direction. The width of the plate portion 82 of the adapter main body 71D is smaller than the width of the plate portion 82 of the adapter main body 71E. The plate portion 82 of the adapter main body 71D is located within a range of a central angle of 90 degrees around the axis L. The plate portion 82 of the adapter main body 71E is located within a range of a central angle of 180 degrees around the axis L.

The adapter body 71F according to the tenth modified example shown in Figures 29 to 32 and the adapter body 71G according to the eleventh modified example shown in Figures 33 to 36 have the same inclination angle θ of the plate portion 82. In both adapter bodies 71F and 71G, the inclination angle θ is 30 degrees.
On the other hand, the adapter main body 71F and the adapter main body 71G have different widths of the plate portion 82. The width of the plate portion 82 of the adapter main body 71F is smaller than the width of the plate portion 82 of the adapter main body 71G. The plate portion 82 of the adapter main body 71F is located within a range of a central angle of 90 degrees around the axis L. The plate portion 82 of the adapter main body 71G is located within a range of a central angle of 180 degrees around the axis L.

In these adapter bodies 71D, 71E, 71F, and 71G, the inclination angle θ of the plate portion 82 is greater than 0 degrees and less than 45 degrees. This allows for the wastewater from the vertical main pipe 20 to collide with the plate portion 82, by converting part of the collision energy into kinetic energy for changing the flow of the wastewater and dissipating it. As a result, the impact noise caused by the wastewater can be reduced. Note that in the adapter body 71 according to the above embodiment, the inclination angle θ is 0 degrees.

Here, verification tests were conducted to confirm the relationship between the inclination angle θ and width of the plate portion 82 and the collision noise generated during drainage. The verification tests were a first verification test that verified the inclination angle θ of the plate portion 82 and a second verification test that verified the width of the plate portion 82.
In the first verification test, the adapter body 71 according to the above embodiment was prepared as a benchmark adapter body with an inclination angle θ of 0 degrees. The adapter body 71E according to the ninth modification was prepared as an adapter body with an inclination angle θ of 15 degrees. The adapter body 71G according to the eleventh modification was prepared as an adapter body with an inclination angle θ of 30 degrees. An adapter body with an inclination angle θ of 45 degrees was also prepared separately. For adapters equipped with these four types of adapter bodies, the sound pressure level (dB) in the 250 Hz range of the impact noise was measured when wastewater was discharged from the vertical main 20 under the same conditions. The results were 31.0 dB for the adapter body with an inclination angle of 0 degrees, 27.1 dB for the adapter body with an inclination angle of 15 degrees, 26.7 dB for the adapter body with an inclination angle of 30 degrees, and 29.5 dB for the adapter body with an inclination angle of 45 degrees.
In the second verification test, the adapter body 71 according to the above embodiment was prepared as the benchmark adapter body. The adapter body 71F according to the tenth modification (with a tilt angle θ of 30 degrees) was prepared as the narrow adapter body. The adapter body 71G according to the eleventh modification (with a tilt angle θ of 30 degrees) was prepared as the wide adapter body. For adapters equipped with these three types of adapter bodies, the sound pressure level (dB) of the impact sound in the 250 Hz range was measured when drainage water was discharged from the vertical main 20 under the same conditions. The results were 31.0 dB for the benchmark adapter body, 28.0 dB for the narrow adapter body, and 26.7 dB for the wide adapter body.

The adapter 70 may be omitted, as in the joint structure 40E of the first reference example shown in FIG. 37 and the joint structure 40F of the second reference example shown in FIG. 38. In this case, an elastic ring 72 is fitted into the first end portion 51, and a restricting member 73 is attached to the first end portion 51. Note that in the joint structure 40F of the second reference example shown in FIG. 38, the second pipe portion 55 is longer than in the joint structure 40E of the first reference example shown in FIG. 37.

In the above-described embodiment, each modified example, and each reference example, the elastic ring 72 and the restricting member 73 may be omitted. When the elastic ring 72 and the restricting member 73 are omitted in the above-described embodiment and each modified example, the slab penetration portion 23 and the adapter body 71 may be connected using an adhesive or a flange. When connecting using an adhesive, it is preferable that the slab penetration portion 23 and the adapter body 71 are made of resin. When connecting using a flange, it is preferable that a flange with a bolt hole is provided at the lower end of the slab penetration portion 23 and at the upper end of the first tubular portion 78 of the adapter body 71.
In the above-described embodiment, each of the modified examples, and each of the reference examples, at least a portion of the flow rectifying portion 76 may be located below the pipe top 55 a of the second pipe portion 55 .

In addition, the components in the above embodiments may be replaced with well-known components as appropriate, and the above-described modifications may be combined as appropriate, without departing from the spirit of the present invention.

10 Drainage system 20 Standpipe (main pipe)
30 Horizontal main pipe (horizontal pipe)
40, 40A, 40B, 40C, 40D, 40E, 40F Joint structure 50 Leg joint (joint)
51 First end portion 52 Second end portion 53 Bent pipe portion 55 Second pipe portion 55a Pipe top 57 First step portion 70 Adapter 72 Elastic ring 73 Restricting member 75 Main body portion 76 Flow straightening portion

Claims (9)

a leg joint having a first socket into which a lower end of a manifold or a standpipe that penetrates a floor slab of a building is placed, a second socket into which a horizontal pipe is attached, a curved pipe portion that connects the first socket and the second socket, and a first step portion that connects the first socket and the curved pipe portion;
an adapter disposed between the lower end of the manifold or the standpipe and the first socket;
a second pipe connected to the second socket;
a cleaning joint connected to the second pipe;
A joint structure comprising:
the adapter includes a main body portion that is disposed in the first socket, supported by the first step portion that connects the first socket and the curved pipe portion, and in which the standpipe is disposed, and an elastic ring;
the main body portion includes a first cylindrical portion and a ring portion provided at a lower portion of the first cylindrical portion and supported by the first step portion,
the ring portion includes an outer peripheral portion that protrudes radially outward and fits with an inner surface of the first socket, and an inner peripheral portion that protrudes radially inward and forms an opening of the ring portion,
The elastic ring is disposed inside the first receiving hole , and a lower end of the elastic ring is supported by the inner peripheral portion . The joint structure according to claim 1 , wherein an inner diameter of an opening on the inside of the ring portion is smaller than an outer diameter of the joint assembly or the standpipe. 3. The joint structure according to claim 1, further comprising a stopper for restricting relative rotation between the adapter and the first socket, the stopper being provided between the inner surface of the first socket and the outer surface of the adapter. The joint structure according to claim 1 , wherein the ring portion has a recess provided on a bottom surface of the ring portion over the entire circumferential direction of the ring portion. The joint structure according to claim 1 , wherein the cleaning joint is partially or entirely transparent. The leg joint is made of vinyl chloride resin,
6. The joint structure according to claim 1, wherein the vinyl chloride resin is a resin obtained by mixing a polyvinyl chloride polymer with an impact-modified resin, a resin obtained by graft-copolymerizing a polyvinyl chloride polymer with an impact-modified resin, a resin obtained by copolymerizing a vinyl chloride monomer with a monomer having an unsaturated bond copolymerizable with the vinyl chloride monomer , or a graft-copolymerized resin obtained by graft-copolymerizing vinyl chloride onto a polymer other than vinyl chloride. the main body is made of vinyl chloride resin,
7. The joint structure according to claim 1, wherein the vinyl chloride resin is a resin obtained by mixing a polyvinyl chloride polymer with an impact-modified resin, a resin obtained by graft-copolymerizing a polyvinyl chloride polymer with an impact-modified resin, a resin obtained by copolymerizing a vinyl chloride monomer with a monomer having an unsaturated bond copolymerizable with the vinyl chloride monomer, or a graft-copolymerized resin obtained by graft-copolymerizing vinyl chloride onto a polymer other than vinyl chloride . The manifold or the standpipe;
The joint structure according to any one of claims 1 to 7;
A drainage system comprising: A building comprising the drainage system of claim 8.