JP7657757B2 - Leg joint and drainage piping structure - Google Patents

Description

The present invention relates to a resin leg joint that connects the downstream end of a vertical pipe or collecting pipe that is piped through each floor to the upstream end of a horizontal main pipe that is piped horizontally under the floor slab of the lower floor in the drainage system of a building with multiple floors, and in particular to a leg joint and drainage piping structure that can use the same support member for the support member that is suspended from the floor slab, regardless of the presence or absence of an outer layer member (vibration damping material, vibration insulator (sound absorbing material), sound insulation material, etc.) attached to the leg joint, the type of the outer layer member, and the type of the vertical pipe or collecting pipe to be connected. Note that being able to use the same support member is synonymous with being able to use the same type of support member or being able to standardize the specifications of the support member.

In the drainage system of a multi-storey building such as a high-rise apartment building, the wastewater from each floor is combined and flows down a drainage stack system that runs through each floor, and is then led to the outdoors by a horizontal drainage main pipe that runs horizontally under the floor slab of the lowest floor. Therefore, a leg joint that is bent in an arc from vertical to horizontal is used to connect the lower end of the drainage stack system to the upstream end of the horizontal drainage main pipe. In this type of drainage system, a horizontal drainage main pipe with a larger diameter than the drainage stack system is generally installed to prevent the wastewater flowing down the drainage stack system from suddenly changing direction and splashing inside the leg joint, blocking the horizontal drainage main pipe.

However, when the space under the floor slab of the lowest floor is narrow, or when the horizontal drainage main pipe is long and it is necessary to ensure the gradient of the horizontal drainage main pipe, the upstream end (the leg joint side) of the horizontal drainage main pipe must be piped as high as possible within the limited space under the floor slab. Therefore, it is necessary to support the leg joint as close as possible to the floor slab so that the horizontal drainage main pipe can be connected at a higher position. Furthermore, for example, in hotels and condominiums that have lobbies with high ceilings on the first floor, when the leg joint is connected to the horizontal main pipe under the floor slab of the second floor, there is a demand to support the leg joint as close as possible to the floor slab of the second floor in order to ensure the spatial height of the first floor.

One example of a support structure for such a leg joint is the structure disclosed in JP 2020-165300 A (Patent Document 1). The leg joint disclosed in Patent Document 1 is a joint that connects a vertical pipe and a horizontal pipe, and is equipped with a curved pipe section (connection section) that is L-shaped when viewed from the side, and a cylindrical support leg that protrudes downward is formed on the underside of the bottom of this curved pipe section. As shown in Figure 17 of Patent Document 1, this support leg is supported from the floor slab by support fittings or the like, thereby supporting the leg joint in a suspended state.

JP 2020-165300 A

However, in the support structure for the leg joint disclosed in Patent Document 1, the support leg protrudes downward from the bottom underside of the L-shaped curved pipe section (connection section) of the leg joint, and the fact that the support leg protrudes downward from the leg joint, and that the leg joint is suspended from the floor slab using this support leg and supported by support fittings, etc., poses the problem that the space below the leg joint is inevitably large.

One way to solve these problems is to directly support the leg joint itself (rather than using a support leg, etc.) and suspend the leg joint from the floor slab. However, the leg joint may or may not be fitted with an outer layer material (vibration-damping material, vibration insulator (sound-absorbing material), sound-proofing material, etc.), and if the type of outer layer material is different, or if the type of vertical pipe or collecting pipe connected to the leg joint is different, the outer diameter of the leg joint at the supporting position will be different, making it difficult to use the same (type of) support material.

The present invention was developed in consideration of the above problems, and its purpose is to provide a resin leg joint and drainage piping structure that allows the same (type of) support member to be used for the support member suspended from the floor slab, regardless of the presence or absence of an outer layer member attached to the leg joint, the type of outer layer member, and the type of vertical pipe or collecting pipe to be connected.

In order to achieve the above object, the leg joint according to the present invention employs the following technical measures.
A leg joint according to one aspect of the present invention is a resin leg joint that connects the downstream end of a vertical pipe or collecting pipe that is piped through each floor to the upstream end of a horizontal main pipe that is piped horizontally under the floor slab of the lower floor in the drainage system of a building having multiple floors, the leg joint including a main body that includes a vertical pipe connection portion that is connected to the vertical pipe or collecting pipe, a horizontal pipe connection portion that is connected to the horizontal main pipe, and a bend portion that changes direction so that the pipe axis direction of the vertical pipe connection portion and the pipe axis direction of the horizontal pipe connection portion are perpendicular to each other, and is characterized in that the leg joint includes an upper protrusion portion that is provided on the outer peripheral surface of the vertical pipe connection portion in the main body, at least in part of its circumferential direction, against which an upper support member for suspending the leg joint from the floor slab abuts.

Preferably, the upper protrusion can be configured to be located above the pipe core of the horizontal pipe connection portion.
More preferably, the leg joint further includes an outer layer member for achieving at least sound insulation, and the upper protrusion portion can be configured to protrude from the outer peripheral surface of the outer layer member.
More preferably, the upper protrusion is present at a portion in the circumferential direction, and the outer layer member can be configured to have an opening at the position of the upper protrusion.

More preferably, the leg joint can be configured to have a lower protrusion on the outer surface of the horizontal pipe connection portion of the main body, at least in part of the lower half in the circumferential direction, which abuts a lower support member for supporting the leg joint from below or a lower support member for suspending the leg joint from a floor slab.
More preferably, the lower protrusion can be configured to have two or more rib shapes.
More preferably, the lower protrusion can be configured to be located closer to the horizontal pipe connection portion than the pipe core of the vertical pipe connection portion.

More preferably, the lower projection may be configured to have a horizontal surface parallel to the slabs forming the floors or ceilings of each floor of the building.
More preferably, the leg joint further includes an outer layer member for achieving at least sound insulation and vibration damping, and the vibration damping material is present on the curved surface of the bend portion, and at the position of the lower protrusion portion, an outer layer member for achieving the vibration damping is not present, but an outer layer member for achieving the sound insulation is present.
More preferably, the main body portion may be provided with a water film cutting protrusion for cutting the water film.

More preferably, the water film cutting protrusion can be configured to be provided at or near the intersection position between the pipe wall of the vertical pipe connection section that is on the side of the horizontal pipe connection section and the pipe wall of the horizontal pipe connection section that is on the side of the vertical pipe connection section.
More preferably, the leg joint further includes a standpipe receiving port provided between the standpipe or the collector pipe and the standpipe connection portion, and the standpipe receiving port can be configured to shift the pipe core of the standpipe or the collector pipe closer to or farther away from the horizontal pipe connection portion.

More preferably, the vertical pipe receiving port can be configured so that, when the inner diameter of the vertical pipe is smaller than the inner diameter of the vertical pipe connection portion, the pipe core of the vertical pipe or the collecting pipe is offset by being brought closer to the horizontal pipe connection portion.
A drainage piping structure according to yet another aspect of the present invention is characterized in that any of the leg joints described above is installed under the floor slab of the lower level of the building.

Preferably, the drainage piping structure relating to this aspect can be configured in a building having N floors (N being a natural number) that require a higher ceiling height than the other floors, such that the leg joint is installed under the floor slab of the (N+1)th floor.
More preferably, in the drainage piping structure relating to this aspect, the upper protrusion can be configured to abut an upper support member for suspending the leg joint from the floor slab, thereby supporting the leg joint.

More preferably, in the drainage piping structure according to this aspect, the same upper support member can be used regardless of the presence or absence of an outer layer member attached to the leg joint, the type of the outer layer member, and the type of standpipe or collecting pipe connected to the standpipe connection part. Here, using the same upper support member means that the same type of upper support member is used (not that multiple support points are supported using one upper support member), and the specifications of the upper support member can be standardized.

According to the present invention, it is possible to provide a resin leg joint and drainage piping structure that can use the same (type of) support member for hanging and supporting from a floor slab, regardless of the presence or absence of an outer layer member attached to the leg joint, the type of outer layer member, and the type of vertical pipe or collecting pipe to be connected.

1 is a side view showing a drainage piping structure in which a leg joint according to an embodiment of the present invention is installed in a narrow space between a second floor floor slab and a first floor ceiling slab. FIG. This is a side view (outline drawing and cross-sectional view) of a drainage piping structure in which a leg joint is connected to an extension pipe (standpipe) using a (short) extension pipe as a standpipe connecting member (without using a standpipe socket). This is a side view (outline drawing and cross-sectional view) of a drainage piping structure in which a leg joint is connected to an extension pipe (standpipe) using a (long) extension pipe as a standpipe connecting member (without using a standpipe socket). This is a side view (outline drawing and cross-sectional view) of a drainage piping structure in which a standpipe socket is used as a standpipe connecting member to connect the leg joint to the lower pipe (standpipe) of a dedicated collector pipe for the lowest floor. This is a two-sided view (top outline view, side 5B cross-sectional view) and a cross-sectional view of the standpipe socket of a drainage piping structure in which a standpipe is connected to a leg joint without eccentricity using a standpipe socket as a standpipe connecting member. 6A and 6B are two-sided views (top outline view and side outline view) of a leg joint including a vertical pipe receiving port in the drainage piping structure shown in FIG. 5 and a side 6C cross-sectional view. This is a two-sided view (top outline view, side 7B cross-sectional view) and a cross-sectional view of a standpipe socket of a drainage piping structure in which a standpipe is eccentrically connected to a leg joint using a standpipe socket as a standpipe connecting member. 8A and 8B are two-sided views (top outline view and side outline view) of a leg joint including a vertical pipe receiving port in the drainage piping structure shown in FIG. 7 and a side 8C cross-sectional view. FIG. 9B is a two-sided view (front outline view and side 9B cross-sectional view) of a leg joint not including a vertical pipe socket. FIG. 13 is a side view of a leg joint having an upper protrusion around its entire circumference. 13 is a diagram for explaining a water film cutting protrusion. FIG. 11A and 11B are diagrams for explaining a state in which a water film is cut by a water film cutting protrusion; FIG. 9 is a diagram for explaining the reason why the pipe core of the vertical pipe is made eccentric by approaching the horizontal pipe connection portion in FIG. 7 and FIG. 8 . FIG. 2 is a side view of a leg joint including an outer layer member, where (A) is an outline drawing of the leg joint plus a cross-sectional view of the outer layer member, and (B) is a cross-sectional view of the leg joint plus a cross-sectional view of the outer layer member. 15A is a side view of the leg joint shown in FIG. 14 to which an upper support member has been attached, and FIG. 15B is a perspective view of a portion of the upper support member, with a cross-sectional view of an outer layer member added to the outline drawing of the leg joint (same as FIG. 14A up to this point). FIG. 15B is a cross-sectional view of a lower support member added thereto. 13 is a diagram showing the state in which the leg joint is suspended and supported from the floor slab by an upper support member and a lower support member. FIG. This is a diagram showing the state in which the leg joint is suspended from the floor slab by an upper support member and supported downward from the floor slab by a lower support member.

The leg joint 100 according to the embodiment of the present invention will be described in detail below with reference to Figs. 1 to 18. The drainage piping structure according to the embodiment of the present invention is constructed by installing the leg joint 100 according to the embodiment shown in Figs. 2 to 16 under the floor slab S of the lower floor of a building (here, the second floor floor slab S2) as shown in Figs. 1, 17 and 18, and preferably under the floor slab S (second floor floor slab S2) of the (N+1)th floor in a building with an Nth floor (N is a natural number, for example, N=1) that requires a higher ceiling height than the other floors. As shown in Fig. 1, the thermal expansion material TE is installed at the position of the floor slab S (second floor floor slab S2). Also, the gap between the drainage piping and the through hole of the slab S through which the drainage piping is inserted is filled with mortar M.

In the following description, the outer peripheral surface, the outer surface, and the outside, the outer layer side, the outer peripheral side, and the outside, the inner layer side, the inner peripheral side, and the inside, and the thermal expansion material and the thermally expandable fireproof material may not be clearly distinguished. In addition, in the cross-sectional view, different members may not be clearly distinguished depending on the type of hatching. Furthermore, in the drawings referred to in the following description, in order to facilitate understanding of the present invention, the parts that should be represented by the outer shape rather than the inside may be represented as if they are seen through the inside, the parts that should be represented by the cross section rather than the outer shape may be represented by the outer shape, the parts that should be represented by the outer shape rather than the cross section may be represented by the cross section, the cross section may not be hatched, the non-cross section may be hatched, the detailed structure may be omitted, and the drawings may not match even if the same member is used because the detailed structure has been omitted or changed. In addition, break lines may not be drawn.

<Characteristics of buildings where leg joints are best installed>
First, referring to Fig. 1, the characteristics of a building in which the leg joint 100 according to the present embodiment is preferably installed will be described. As an example of an installation example, in a hotel or condominium with a lobby with a high ceiling on the first floor as shown in Fig. 1, when the leg joint 100 is connected to the horizontal main pipe 1200 under the second floor floor slab S2, in order to sufficiently secure the height H (1) from the first floor floor surface FL to the first floor ceiling in the first floor space 1FS, the leg joint 100 is supported as close as possible to the second floor floor slab S2 (thickness t (S2)). Even in this case, it is necessary to provide a gap of the specified dimension L (2) between the upper surface of the first floor ceiling slab S1 (thickness t (S1)) and the leg joint 100 (more specifically, the lowest end of the horizontal pipe connection part 120 of the leg joint 100 described later). The fitting dimension L(1) of the leg joint 100 is determined by the distance from the top surface of the second floor floor slab S2 to the leg joint 100 (the bottom end of the horizontal pipe connection part 120 of the leg joint 100). As an example, when the second floor floor slab thickness t(S2) is 75mm to 120mm and the nominal diameter of the horizontal main pipe is 150A, the fitting dimension L(1) is 347mm, which is the best fitting case in the construction example using the leg joint 100 of this embodiment. This allows a lobby with a high height H(1) from the floor surface FL to the ceiling to be provided on the first floor.

<Outline of leg joint 100 and support structure>
An outline of the structure and support structure of a leg joint 100 according to the present embodiment will be described with reference to FIGS.
First, in Fig. 1 to Fig. 4, a drainage piping structure in which slabs and the like are removed from the construction drawing shown in Fig. 1 is shown in Fig. 2, and Fig. 2 shows a drainage piping structure in which the leg joint 100 is connected to the extension pipe (standpipe) 200 using a (short) extension pipe as a standpipe connecting member (without using a standpipe socket), Fig. 3 shows a drainage piping structure in which the leg joint 100 is connected to the extension pipe (standpipe) 200 using a (long) extension pipe as a standpipe connecting member (without using a standpipe socket), and Fig. 4 shows a drainage piping structure in which the leg joint 100 is connected to the lower pipe (standpipe) 1300 of the lowest floor exclusive collecting pipe using a standpipe socket 300 as a standpipe connecting member. Note that the leg joint 100 according to this embodiment may be connected to a collecting pipe that is not exclusive to the lowest floor (not limited to the lowest floor). Note that the standpipe 200 and the extension pipe 200, and the standpipe 1300 and the lower pipe 1300 may be described without distinction from each other.

As shown in these figures, this leg joint 100 is a resin leg joint that connects the downstream end of a vertical pipe 200 or a collecting pipe (as an example, the lower pipe 1300 constituting the collecting pipe dedicated to the lowest floor in Figure 4) that is piped through each floor in the drainage system of a building having multiple floors, to the upstream end of a horizontal main pipe 1200 that is piped horizontally under the floor slab of the lower floor.
This leg joint 100 includes a main body including a stand pipe connection part 110 connected to a stand pipe 200 or a lower pipe 1300 of a collecting pipe, a horizontal pipe connection part 120 connected to a horizontal main pipe 1200, and a bend part 130 that changes direction so that the pipe axis direction of the stand pipe connection part 110 and the pipe axis direction of the horizontal pipe connection part 120 are perpendicular to each other, and this main body is suspended and supported from a floor slab. In addition to this main body, the leg joint 100 may further include a stand pipe receiving port 300 and outer layer members (vibration damping material 160, vibration insulator (sound absorbing material 150), sound insulation material 152, etc.) described later.

A characteristic structure is that the outer surface of the vertical pipe connection portion 110 in the main body is provided with an upper protrusion portion 112, which is provided in contact with an upper support member 170 (shown in Figure 15, etc.) on at least a portion of the circumferential direction thereof for suspending the leg joint 100 from the floor slab.
This upper protrusion 112 is located above the pipe core of the horizontal pipe connection part 120. Therefore, it is preferable in that the leg joint 100 can be suspended from the floor slab by an anchor bolt (sleeve) AB and a short cut bolt (fully threaded bolt) B, etc., embedded in the underside of the floor slab (second floor floor slab S2). That is, the suspension support structure by the upper support member 170 using the upper protrusion 112 requires a shorter cut bolt B for suspending and supporting the leg joint 100 and is more stable than the suspension support structure by the lower support member 180 using the lower protrusion 122 shown in Fig. 17 described later.

As will be described in more detail later, this leg joint 100 further includes an outer layer member (more specifically, sound absorbing material 150 shown in FIG. 14, etc.) for at least achieving sound insulation (wrapped around the outer periphery of the leg joint 100, etc.), and this upper protrusion 112 (the outermost diameter) protrudes from the outer periphery of the outer layer member (the outermost diameter of the sound absorbing material 150). In addition, although not limited thereto, this upper protrusion 112 is present in a portion of the circumferential direction (here, four locations at 90 degree intervals), and the outer layer member (here, sound absorbing material 150) has an opening at the position of the upper protrusion 112.

That is, the upper protrusion 112 has the width W and height H shown in FIG. 9(A), and the outer layer member (here, the sound absorbing material 150 or the sound insulating material 152 in addition to the sound absorbing material 150) has openings with a width slightly larger than the width W and a height slightly larger than the height H at four positions at 90 degree intervals where the upper protrusion 112 is present, and the outer layer member and the upper protrusion 112 do not overlap, and the upper protrusion 112 is present at the outermost position where it is supported by the upper support member 170 (thickness of the outer layer member < length L of the upper protrusion 112). Note that the upper support member 170 is composed of, for example, a band portion 172 and a fastening member 174 shown in FIG. 15, and since the height of the band portion 172 is about 30 mm, the height H of the upper protrusion 112 is preferably about 12 mm to 20 mm.

Therefore, even if (1) the outer diameter of the leg joint 100 (here, the outer diameter of the standpipe connection part 110) at the position supported by the upper support member 170 differs due to the fact that an outer layer member (vibration-damping material 160, vibration insulator (sound-absorbing material 150), sound-proofing material 152, etc.) is or is not attached to the leg joint 100, (2) the type of this outer layer member is different, or (3) the type of the standpipe or collector pipe connected to the leg joint is different, the same upper support member 170 can be used because the upper support member 170 is abutted against the upper protrusion 112. Here, being able to use the same upper support member 170 means that the same type of upper support member 170 can be used (not that multiple support points are supported using one upper support member 170) and that the specifications of the upper support member 170 can be standardized. In the above-mentioned case (3), it is necessary to match the outermost diameter length LL of the upper protrusion 112. This point will not be repeated below.

Furthermore, since the outer layer member has an opening, positioning can be achieved reliably and easily by aligning the opening with the position of the upper protrusion 112 .
In a drainage piping structure using the leg joint 100 having such an upper protrusion 112, the leg joint 100 can be supported by an upper support member 170 for suspending the leg joint 100 from a floor slab abutting against the upper protrusion 112. In this case, the same (type of) upper support member 170 can be used regardless of the presence or absence of an outer layer member attached to the leg joint 100, the type of the outer layer member, and the type of standpipe or collecting pipe connected to the standpipe connection part 110.

In addition to this upper protrusion 112, the leg joint 100 is provided with a lower protrusion 122 that is provided on the outer peripheral surface of the horizontal pipe connection portion 120 of the main body, at least in a portion of the lower half in the circumferential direction, and against which a lower support member 180 (shown in Figures 16, 18, etc.) for supporting the leg joint 100 from below, or a lower support member 180 (shown in Figures 16, 17, etc.) for suspending the leg joint 100 from the floor slab, is abutted.

The lower protrusion 122 has two or more rib shapes (four are shown in the figure). The lower protrusion 122 is located closer to the horizontal pipe connection part 120 than the pipe core of the vertical pipe connection part 110. The lower protrusion 122 has a horizontal surface 122L (shown in the enlarged view of FIG. 9(A)) that is parallel to the slab that forms the floor or ceiling of each floor of the building. This horizontal surface 122L abuts against the horizontal surface 180L (shown in the enlarged view of FIG. 16) of the lower support member 180 (here, an angle bar), allowing the lower support member 180 to stably support the leg joint 100.

The leg joint 100 further includes an outer layer member for realizing at least sound insulation and vibration damping. Here, the vibration damping material 160 and the vibration insulator (sound absorbing material 150) are essential, and the sound insulating material 152 is optionally included. Here, as an example, these materials include butyl rubber as the vibration damping material 160, polyethylene terephthalate felt (non-woven fabric made of PET) as the sound absorbing material 150, and soft polyvinyl chloride as the sound insulating material 152. In this leg joint 100, the vibration damping material 160 is present at the curved surface portion of the bend portion 130 (the position where the drainage flow that has flowed down the vertical pipe hits), and the vibration damping material 160 as an outer layer member for realizing vibration damping is not present at the position of the lower protrusion portion 122, and the sound absorbing material 150 or the sound insulating material 152 in addition to the sound absorbing material 150 is present as an outer layer member for realizing sound insulation. That is, the lower protrusion 122 does not overlap the vibration-damping material 160, but at least overlaps the sound-absorbing material 150, so that the lower protrusion 122 abuts against the lower support member 180 (here, the angle bar) via the sound-absorbing material 150, thereby providing a vibration-damping effect.

The leg joint 100 also has a water film cutting projection 140 (shown in FIG. 11 etc.) on its main body for cutting the water film. This water film cutting projection 140 is provided at or near the intersection between the pipe wall of the stand pipe connection part 110 on the side of the horizontal pipe connection part 120 and the pipe wall of the horizontal pipe connection part 120 on the side of the stand pipe connection part 110.
Since the water film formed by the drainage water that has fallen from the standpipe to the leg joint can be cut by the water film cutting projection 140, the water film formed by the drainage water that has fallen from the standpipe to the leg joint 100 is cut (an air layer can be secured in the leg joint 100 when draining water from the standpipe, and the leg joint 100 is prevented from being filled with drainage water), the standpipe is unlikely to become negative pressure even if the drainage water is discharged from the leg joint 100 at high speed, and the standpipe is unlikely to become positive pressure even if the drainage water is discharged from the leg joint 100 at low speed, and the occurrence of unexpected negative pressure or positive pressure in the standpipe can be suppressed. This makes it possible to suppress the occurrence of seal water breakage, in which the water accumulated in the drainage trap is sucked into the standpipe due to a large negative pressure in the standpipe, or the water accumulated in the drainage trap is sprayed out into the room due to a large positive pressure in the standpipe.

The water film cutting protrusion 140 is formed from one protrusion, and is formed from one protrusion having a substantially triangular shape in a front view from the pipe core of the vertical pipe connection part 110 toward the horizontal pipe connection part 120 (shown in the enlarged view of area A(1) in FIG. 11). In this way, the water film cutting protrusion 140 is provided on the thick main body part of the leg joint 100 (not a separate member from the main body part of the leg joint) and is integrated with the main body part of the leg joint 100. This saves the trouble of preparing the water film cutting protrusion 140 separately from the main body part of the leg joint 100, and the water film cutting protrusion 140 is integrated with the thick main body part, so that sufficient strength can be ensured. Furthermore, the water film cutting protrusion 140 has a substantially triangular cross section, and although it is a simple single structure, it can efficiently cut the water film and create a space below the water film cutting protrusion 140 through which air can pass.
In order to ensure that flowing water hits the water film cutting protrusion 140, the leg joint 100 has the following configuration.

The leg joint 100 further includes a standpipe socket 300 provided between the standpipe or collector and the standpipe connection part 110. This standpipe socket 300 can move the pipe core of the standpipe or collector closer to the horizontal pipe connection part 120 (as shown in FIG. 13(A)) or farther away (as shown in FIG. 13(B)) to make it eccentric. Here, when the inner diameter of the standpipe is smaller than the inner diameter of the standpipe connection part 110, this standpipe socket 300 makes the pipe core of the standpipe or collector closer to the horizontal pipe connection part 120 to make it eccentric. For example, when the standpipe connection part 110 corresponds to a nominal diameter of the standpipe of 125A, when a standpipe with a nominal diameter of 100A is to be connected to the standpipe connection part 110, the standpipe socket 304 (shown in FIG. 7 and FIG. 8) is used to make the pipe core of the standpipe closer to the horizontal pipe connection part 120 (as shown in FIG. 13(A)) to make it eccentric. Therefore, even if the pipe diameter of the standpipe connected to the leg joint 100 becomes smaller, if a different standpipe receiving port 300 is prepared using the same leg joint 100, the flowing water can be reliably directed at the water film cutting protrusion 140.

Here, for example, the leg joint disclosed in JP 2021-162095 A does not have a water film cutting protrusion on the main body of the leg joint, but instead has a protrusion for cutting the water film on the adapter body of the adapter that includes the adapter body, an elastic ring, and a fixing member, and is composed of four parts. On the other hand, the leg joint 100 according to the present embodiment is composed of two parts: the leg joint 100 with the water film cutting protrusion 140 on its main body, and the standpipe receptacle 300 prepared according to the diameter of the standpipe. Therefore, the leg joint 100 according to the present embodiment has a small number of parts (in addition to being superior in strength), and the assembly process can be reduced.

In addition to the effect of ensuring that the flowing water hits the water film cutting protrusion 140, when the pipe diameter of the vertical pipe connected to the leg joint 100 is small, the reason why it is preferable to have the protrusion close to the horizontal pipe connection part 120 (as shown in Figure 13(A)) rather than away from it (as shown in Figure 13(B)) will be described later.
In a drainage piping structure using a leg joint 100 equipped with such a water film cutting protrusion 140, when the inner diameter of the standpipe or collecting pipe is smaller than the inner diameter of the standpipe connection part, the pipe core of the standpipe or collecting pipe can be constructed by bringing it closer to the horizontal pipe connection part and eccentrically installing it. Even if the pipe diameter of the standpipe connected to the leg joint 100 becomes smaller, a drainage piping structure can be realized in which the flowing water is reliably directed at the water film cutting protrusion 140 by using the same leg joint 100 and simply preparing a different standpipe receiving port 300.

<Detailed structure of leg joint 100>
The structure of the leg joint 100 according to this embodiment will be described in more detail below.
As shown in Fig. 1 and Fig. 2, this leg joint 100 is connected to a collecting pipe that is rolled and piped on the second floor slab S2 via a standpipe 200. The collecting pipe is provided with an upper pipe 1100 with a water collection chamber, a standpipe receiving member 1102, and a branch pipe receiving member 1104. Also, as shown in Fig. 3, it can be connected to the collecting pipe via a standpipe 200 that is longer than the standpipe 200 adopted in Fig. 2. In this case, if the fitting dimension L(1) shown in Fig. 1 is set to the same as that in Fig. 1, the collecting pipe can be piped floating on the second floor slab S2. In any case, the leg joint 100 shown in Figs. 1 to 3 does not have a standpipe receiving member 300. In contrast, the collecting pipe shown in Fig. 4 is a collecting pipe exclusively for the lowest floor, in which a lower pipe 1300 is connected below an upper pipe 1100 equipped with a standpipe receiving member 1102 and a branch pipe receiving member 1104, and the lower pipe 1300 is connected to a leg joint 100 via a standpipe receiving port 300. As mentioned above, the collecting pipe to which the leg joint according to the present invention is connected is not limited to the collecting pipe exclusively for the lowest floor shown in Fig. 4, but may be a collecting pipe for an intermediate floor (equipped with a reduced diameter section or swirl vanes in the lower pipe). Also, the cross-sectional views of Figs. 2 to 4 show the inner diameter of the pipe, as an example.

The leg joint 100 shown in these Figures 1 to 4 has the above-mentioned features of an upper protrusion 112, a lower protrusion 122, a water film cutting protrusion 140, and outer layer members (vibration-damping material 160, vibration insulator (sound-absorbing material 150), sound-proofing material 152), and the leg joint 100 shown in Figure 4 has a standpipe receiving port 300 that can offset a standpipe or the like connected to the leg joint 100.
Next, the standpipe socket 300 will be described. Figures 5 and 6 show the standpipe socket 302 used when the standpipe 1302 connected to the leg joint 100 is not offset, and Figures 7 and 8 show the standpipe socket 304 used when the standpipe 1304 connected to the leg joint 100 is offset. Here, it is assumed that the standpipe 1302 has a nominal diameter of 125A, and the standpipe 1304 has a nominal diameter of 100A.

In the non-eccentric state shown in Fig. 5 and Fig. 6, and the eccentric state shown in Fig. 7 and Fig. 8, the standpipe receptacle 302 and the standpipe receptacle 304, which have different structures, are used. Both of these standpipe receptacles 302 and 304 have a substantially hollow cylindrical shape, but the standpipe receptacle 302 shown in Fig. 5(C) does not have the space 304S that the standpipe receptacle 304 shown in Fig. 7(C) has. The standpipe receptacle 304 can eccentrically move the pipe core of the standpipe 1304 closer to or farther from the horizontal pipe connection part 120 by using this space 304S (close in Fig. 7). In addition, if the standpipe receptacle 304 is joined to the standpipe connection part 110 of the leg joint 100 in the left-right reversed state in the state shown in Fig. 7(A), the pipe core of the standpipe 1304 can be eccentrically moved away from the horizontal pipe connection part 120.

Next, the upper protrusion 112 and the lower protrusion 122 will be described with reference to FIG.
As shown in the front outline view of the leg joint 100 shown in Fig. 9(A) (viewed from the direction of the outlined arrow shown in Fig. 9(B)), the upper protrusion 112 has a width W and a height H, and has a length L that protrudes from the outer layer member provided on the leg joint 100. Since an opening (slightly larger than the width W and height H) is provided at the position of the upper protrusion 112 in the outer layer member, the upper protrusion 112 is configured to always abut against the band portion 172 of the upper support member 170, as shown in the enlarged view of Fig. 14(A). In other words, even if the outer diameter of the leg joint 100 (here, the outer diameter of the standpipe connection portion 110) at the position supported by the upper support member 170 is different due to (1) whether or not an outer layer member (vibration-damping material 160, vibration insulator (sound-absorbing material 150), sound-proofing material 152, etc.) is attached to the leg joint 100, (2) the type of this outer layer member is different, or (3) the type of standpipe or collector pipe connected to the leg joint is different, the upper support member 170 is abutted against the upper protrusion portion 112, and therefore the same (type) upper support member 170 can be used.

On the other hand, as shown in the front outline view of the leg joint 100 shown in Fig. 9(A), the lower protrusion 122 is formed in a rib shape downward from the arc-shaped bend portion 130 constituting the main body of the leg joint 100. As shown in Fig. 9(A), the lower protrusion 122 has a horizontal surface 122L parallel to the slab forming the floor or ceiling of each floor of the building. The leg joint 100 having the lower protrusion 122 that is linear rather than arc-shaped can be stably supported by a lower support member 180 such as an angle member.
In addition, since the upper protrusion portion provided on the outer surface of the vertical pipe connection portion 110 in the main body of the leg joint 100 is provided on at least a portion of the circumferential direction, it may be provided on the entire circumference like the upper protrusion portion 113 provided on the leg joint 103 shown in Figure 10.

Next, the water film cutting projection 140 will be described with reference to Figures 11 to 13. Figure 11 shows views of the water film cutting projection 140 provided on the main body of the leg joint 100 from each direction. More specifically, in Figure 11, the upper left figure shows a front view of the water film cutting projection 140, the upper right figure shows a rear view of the water film cutting projection 140, and the lower right figure shows a bottom view of the water film cutting projection 140. Also, Figure 5(A) etc. shows a top view of the water film cutting projection 140.
This water film cutting protrusion 140 is formed from a single protrusion with a simple, approximately triangular shape when viewed from the front as shown in the front view, and therefore has high strength due to its simple shape, and can efficiently cut the water film due to its approximately triangular shape, creating a space below the water film cutting protrusion 140 through which air can pass.
FIG. 12A shows the state of the water film when the water film cutting protrusion 140 is not present, and FIG. 12B shows the state of the water film when the water film cutting protrusion 140 is present.

As shown in FIG. 12(A), if the water film cutting protrusion 140 does not exist, a water film is formed by the wastewater that falls from the standpipe to the leg joint, and there is no air passage (an air layer cannot be secured). If an air layer cannot be secured in the leg joint when draining water from the standpipe, the leg joint will be filled with wastewater, and if the wastewater is discharged from the leg joint at high speed, the standpipe will easily become negative pressure, and if the wastewater is discharged from the leg joint at low speed, the standpipe will easily become positive pressure, resulting in unexpected negative or positive pressure in the standpipe. There is a problem that the water seal will be broken if the negative pressure in the standpipe is too high, causing the water accumulated in the drain trap to be sucked into the standpipe, or if the positive pressure in the standpipe is too high, causing the water accumulated in the drain trap to spray out into the room.

On the other hand, as shown in Figure 12 (B), when a water film cutting protrusion 140 is present, the drainage flow flowing down from the vertical pipe to the leg joint hits the water film cutting protrusion 140, and the drainage flow is divided into two, thereby ensuring an air passage, thereby preventing the occurrence of seal water breakdown.
In order to prevent problems such as seal water breakage, it is necessary to ensure that the drainage flow hits the water film cutting projection 140, so as shown in Figures 7 and 8, the standpipe receptacle 304 is used to make the pipe core of the standpipe close to the horizontal pipe connection part 120 (as shown in Figure 13(A)) and eccentric. Here, in addition to the effect of ensuring that the flowing water hits the water film cutting projection 140, the reason why it is preferable to have the standpipe close to the horizontal pipe connection part 120 (as shown in Figure 13(A)) rather than away (as shown in Figure 13(B)) when the pipe diameter of the standpipe connected to the leg joint 100 becomes small will be explained.

As shown in Figure 13 (B), when the pipe is offset outward, the distance WL until the drain hits the main body (bend portion 130) of the leg joint 100 becomes shorter, narrowing the drain space WS. If the drain space WS is narrow, the air passage in the vertical pipe is easily blocked, which can easily lead to the generation of excessive positive pressure.
On the other hand, as shown in Figure 13 (A), when the center is offset inward, the distance WL until the drain hits the main body (bend portion 130) of the leg joint 100 becomes longer, and the drain space WS becomes wider. If this drain space WS is wider, the air passage in the vertical pipe is less likely to be blocked, and excessive positive pressure is less likely to be generated.

Next, referring to FIG. 14 (partly in FIG. 9), the relationship between the upper protrusion 112 and the band portion 172 of the upper support member 170 will be described when an outer layer member (vibration-damping material 160, vibration insulator (sound-absorbing material 150), sound-proofing material 152) is provided on the leg joint 100. As shown in FIG. 9(A), the upper protrusion 112 has a width W and a height H, and a length L that protrudes from the outer layer member (only the sound-absorbing material 150 is shown in the enlarged view of FIG. 14(A)) provided on the leg joint 100. Since an opening (slightly larger than the width W and height H) is provided at the position of the upper protrusion 112 in the sound-absorbing material 150, which is the outer layer member, the upper protrusion 112 always abuts against the band portion 172 of the upper support member 170, as shown in the enlarged view of FIG. 14(A). Therefore, the same (type of) upper support member 170 can be used regardless of whether or not an outer layer member is attached to the leg joint 100, the type of outer layer member, and the type of standpipe or collecting pipe connected to the standpipe connection part 110.

Next, referring to FIG. 15, the state in which the upper support member 170 is attached to the leg joint 100 will be described. As shown in the enlarged view of FIG. 14(A) above, when the leg joint 100 includes an outer layer member (here, the sound-absorbing material 150), the upper protrusion 112 protrudes from the opening of the outer layer member and its tip is exposed and protrudes beyond the outer layer member. In this state, the band portion 172 (e.g., a combination of semicircular ring-shaped bands) of the upper support member 170 abuts against the tip of the upper protrusion 112, and the upper support member 170 is attached to the vertical pipe connection portion 110 of the main body of the leg joint 100 by the fastening member 174 (e.g., a member that screws together the combination of semicircular ring-shaped bands with a bolt and a nut). In this case, it is preferable that the same (type of) material can be used for the upper support member 170 regardless of the presence or absence of an outer layer member attached to the leg joint 100, the type of outer layer member, and the type of standpipe or collector pipe connected to the standpipe connection part 110. The upper support member 170 has a circular cut bolt hole portion through which the cut bolt B is inserted when the combination of semicircular ring-shaped bands is integrated.

Next, referring to FIG. 16, the state in which the lower support member 180 is attached (contacted) to the leg joint 100 will be described. As shown in FIG. 16, in this leg joint 100, the vibration-damping material 160 is present on the curved surface portion of the bend portion 130 (the position where the drainage flow that flows down the vertical pipe hits), and the vibration-damping material 160 is not present as an outer layer member for achieving vibration damping at the position of the lower protrusion portion 122 where the lower support member 180 is attached, and the sound-absorbing material 150 or the sound-insulating material 152 in addition to the sound-absorbing material 150 (in the enlarged view of FIG. 16, the sound-insulating material 152 in addition to the sound-absorbing material 150) is present as an outer layer member for achieving sound insulation. The lower protrusion portion 122 has a horizontal surface 122L, so that the horizontal surface 180L of the lower support member 180 such as an angle member can be contacted with this horizontal surface 122L to provide stable support, as shown in FIG. 16. This lower support member 180 stably supports the bend in the main body of the leg joint 100, and is suspended from the floor slab (here, the second floor floor slab S2) or supported from below (here, the first floor ceiling slab S1) by the support structure described below.

<Support structure of leg joint 100>
Next, the support structure of the leg joint 100 will be described with reference to Figures 17 and 18. The support structure shown in Figure 17 and the support structure shown in Figure 18 are the same in terms of suspension support from the floor slab by the upper support member 170, but differ in that the support structure by the lower support member 180 is suspension support from the floor slab (second floor floor slab S2) in the support structure shown in Figure 17, and (lifting) support from below (first floor ceiling slab S1) in the support structure shown in Figure 18.

As shown in FIG. 17, the upper support member 170 is attached so that the inner circumferential surface of the band portion 172 abuts against the upper projection 112 of the vertical pipe connection portion 110 in the main body of the leg joint 100. The cut bolt B (shorter than the cut bolt B for suspension support by the lower support member 180) is inserted into the cut bolt hole and screwed with a nut N, and the upper support member 170 is suspended from the second floor slab S2. The lower support member 180, whose horizontal surface 180L abuts against the horizontal surface 122L of the lower projection 122 of the horizontal pipe connection portion 120 in the main body of the leg joint 100, is suspended from the second floor slab S2. The cut bolt B (longer than the cut bolt B for suspension support by the upper support member 170) is inserted into the cut bolt hole provided in the lower support member 180 and screwed with a nut N.

With reference to Fig. 18, differences from the support structure shown in Fig. 17 will be described. The lower support member 180, whose horizontal surface 180L abuts against the horizontal surface 122L of the lower protrusion 122 of the horizontal pipe connection part 120 in the main body of the leg joint 100, is supported so that the lower end of the lower support member 180 is lifted up from below (here, the first floor ceiling slab S1).
Here, it is preferable that the upper support member 170 provided in contact with the upper protrusion 112 and/or the lower support member 180 provided in contact with the lower protrusion 122 be provided with vibration-proof rubber or the like having vibration-proofing properties.

As described above, according to the leg joint 100 of this embodiment and the drainage piping structure in which the leg joint 100 is installed on the floor slab of a building, the support member that suspends and supports the leg joint from the floor slab can be the same (type of) support member regardless of the presence or absence of an outer layer member attached to the leg joint, the type of outer layer member, and the type of vertical pipe or collecting pipe to be connected.

It should be noted that the embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is indicated by the claims rather than the above description, and is intended to include all modifications within the meaning and scope of the claims.

The present invention is suitable for leg joints that are installed through the floor slab of a building, and is particularly suitable in that the same (type of) support member can be used to suspend and support the leg joint from the floor slab, regardless of the presence or absence of an outer layer member attached to the leg joint, the type of outer layer member, and the type of vertical pipe or collecting pipe to be connected.

100 Leg joint 110 Vertical pipe connection part 112 Upper protrusion part 120 Horizontal pipe connection part 122 Lower protrusion part 130 Bend part 140 Water film cutting protrusion 150 Sound absorbing material (vibration insulator)
152 Sound insulation material 160 Vibration damping material 170 Upper support member 180 Lower support member 200 Standpipe (extension pipe)
300 Vertical pipe socket 1100 Upper pipe 1200 Horizontal pipe 1300 Lower pipe

Claims (17)

In drainage facilities for a building having multiple floors, a resin leg joint is provided for connecting the downstream end of a vertical pipe or a collecting pipe that is piped through each floor to the upstream end of a horizontal main pipe that is piped horizontally under the floor slab of the lower floor,
The leg joint includes a main body including a stand pipe connection portion connected to the stand pipe or the collecting pipe, a horizontal pipe connection portion connected to the horizontal main pipe, and a bend portion that changes direction so that the pipe axis direction of the stand pipe connection portion and the pipe axis direction of the horizontal pipe connection portion are perpendicular to each other, and connects the stand pipe connection portion and the horizontal pipe connection portion,
A lower protrusion is provided on the outer peripheral surface of the horizontal pipe connection portion of the main body, in at least a part of the lower half in the circumferential direction, to which a lower support member for supporting the leg joint from below or a lower support member for suspending the leg joint from a floor slab is abutted ,
A leg joint , characterized in that the lower protrusion portion has a horizontal surface . In drainage facilities for a building having multiple floors, a resin leg joint is provided for connecting the downstream end of a vertical pipe or a collecting pipe that is piped through each floor to the upstream end of a horizontal main pipe that is piped horizontally under the floor slab of the lower floor,
The leg joint includes a main body including a stand pipe connection portion connected to the stand pipe or the collecting pipe, a horizontal pipe connection portion connected to the horizontal main pipe, and a bend portion that changes direction so that the pipe axis direction of the stand pipe connection portion and the pipe axis direction of the horizontal pipe connection portion are perpendicular to each other, and connects the stand pipe connection portion and the horizontal pipe connection portion,
A lower protrusion is provided on the outer peripheral surface of the horizontal pipe connection portion of the main body, in at least a part of the lower half in the circumferential direction, to which a lower support member for supporting the leg joint from below or a lower support member for suspending the leg joint from a floor slab is abutted,
The leg joint further includes an outer layer member for achieving at least sound insulation and vibration damping properties,
an outer layer member for realizing the vibration damping property is present on a curved surface of the bent portion;
A leg joint, characterized in that at the position of the lower protrusion, there is no outer layer member for achieving the vibration damping properties, but there is an outer layer member for achieving the sound insulation properties. 2. The lower protrusion has two or more rib shapes.
Item 3. The leg joint according to item 2 . 3. A leg joint according to claim 1 , wherein the lower protrusion is located closer to the horizontal pipe connection portion than a pipe core of the vertical pipe connection portion. 3. A leg joint as claimed in claim 1 or claim 2 , characterized in that the lower projection has a horizontal surface parallel to a slab forming a floor or ceiling of each floor of the building. A leg joint as described in claim 1 or claim 2 , further comprising an upper protrusion portion provided on the outer peripheral surface of the vertical pipe connection portion of the main body portion, at least in part in the circumferential direction , against which an upper support member for suspending the leg joint from the floor slab abuts . 7. The leg joint according to claim 6 , wherein the upper protrusion is located above a pipe core of the horizontal pipe connection portion. The leg joint further includes an outer layer member for achieving at least sound insulation,
The leg joint according to claim 6 , characterized in that the upper protrusion protrudes from an outer circumferential surface of the outer layer member. The upper protrusion is present in a portion in the circumferential direction,
The leg joint according to claim 8 , characterized in that the outer layer member is provided with an opening at the position of the upper protrusion. The leg joint according to claim 1 or 2 , characterized in that the main body portion is provided with a water film cutting protrusion for cutting the water film. The leg joint according to claim 10, characterized in that the water film cutting protrusion is provided at or near the intersection between the pipe wall of the vertical pipe connection part on the side of the horizontal pipe connection part and the pipe wall of the horizontal pipe connection part on the side of the vertical pipe connection part. The leg joint further includes a standpipe socket provided between the standpipe or the collecting pipe and the standpipe connection portion,
The leg joint according to claim 10, characterized in that the stand pipe receiving port makes the pipe core of the stand pipe or the collecting pipe approach or move away from the horizontal pipe connection portion to be offset. The leg joint according to claim 12, characterized in that when the inside diameter of the standpipe is smaller than the inside diameter of the standpipe connection part, the standpipe receiving port moves the pipe core of the standpipe or the collecting pipe closer to the horizontal pipe connection part and offsets it. A drainage piping structure, characterized in that the leg joint according to claim 1 or 2 is installed under the floor slab of the lower level of the building. The drainage piping structure according to claim 14, characterized in that in the building having an Nth floor (N being a natural number) that requires a higher ceiling height than the other floors, the leg joint is installed under the floor slab of the (N+1)th floor. The leg joint further includes an upper protrusion provided on the outer circumferential surface of the vertical pipe connection portion of the main body, at least in a portion of the circumferential direction thereof, in contact with an upper support member for suspending the leg joint from the floor slab;
The drainage piping structure according to claim 14, characterized in that an upper support member for suspending the leg joint from the floor slab abuts against the upper protrusion to support the leg joint. The drainage piping structure according to claim 14, characterized in that the same upper support member is used regardless of the presence or absence of an outer layer member attached to the leg joint, the type of the outer layer member, and the type of standpipe or collecting pipe connected to the standpipe connection part.