JP7741767B2 - Construction method of drainage piping structure including leg joint, leg joint, drainage piping structure - Google Patents

Description

This invention relates to a resin leg joint that connects the downstream end of a vertical pipe that runs through each floor to the upstream end of a horizontal main pipe that runs horizontally below the floor slab of the lowest floor in the drainage system of a multi-story building. In particular, it relates to a leg joint and drainage piping structure that uses a small number of parts and shortens the construction work, and is installed below a floor slab where piping is connected only vertically above the floor slab.

In the drainage systems of multi-story buildings, such as high-rise apartment buildings, the wastewater from each floor is combined and flows down a drainage stack system that runs through each floor, and is then led outdoors via a horizontal main drainage pipe that runs horizontally under the floor slab of the lowest floor. Therefore, a leg joint that bends 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 main drainage pipe.

A drainage piping structure using such leg joints, which improves the fit of the piping according to the slab thickness of the lowest floor slab while suppressing cost increases, and also facilitates construction management, is disclosed in JP 2019-073969 A (Patent Document 1). The drainage piping structure disclosed in Patent Document 1 is a drainage piping structure installed in the lowest floor slab, and includes a manifold having a branch pipe connection portion connectable to a horizontal branch pipe located above the lowest floor slab and a cylindrical lower connection portion formed below the branch pipe connection portion and extending downward; a curved leg joint connected to a horizontal main pipe located below the lowest floor slab; a connecting joint having a straight vertical connecting pipe at least partially embedded in the lowest floor slab and connecting the lower connection portion to the leg joint; an upper socket into which the lower connection portion can be inserted; and a lower socket into which the upper end of the vertical connecting pipe can be inserted. The lower socket into which the upper end of the vertical connecting pipe is inserted is embedded in the lowest floor slab, and the lower connection portion is inserted into the upper socket, at least a portion of which protrudes above the top surface of the lowest floor slab.

With this drainage piping structure, the lower connection part of the collective joint and the leg joint are connected via a connecting vertical pipe rather than directly. Therefore, by preparing a short connecting vertical pipe when the slab thickness of the lowest floor slab is thin and a long connecting vertical pipe when the slab thickness of the lowest floor slab is thick, it is possible to realize a drainage piping structure that corresponds to the slab thickness of the lowest floor slab. In other words, with this drainage piping structure, there is no need to manufacture a special collective joint even if the slab thickness of the lowest floor slab changes, so it is possible to improve the fit of the piping according to the slab thickness of the lowest floor slab while suppressing increases in manufacturing costs.

Japanese Patent Application Laid-Open No. 2019-073969

However, as disclosed in Patent Document 1, the lower connection portion of the collecting joint and the leg joint are connected via a connecting joint and a connecting vertical pipe for the lowest floor. However, if the horizontal branch pipe is not connected above the floor slab of the lowest floor, the vertical pipe and the leg joint are connected (piping exists only vertically above the floor slab). However, since the drainage piping structure disclosed in Patent Document 1 requires the collection joint to be configured above the floor slab, the horizontal branch pipe connection portion of the collecting joint is unnecessary, which creates the problem of requiring a cap to be placed over the horizontal branch pipe connection. Another problem is that using a collecting joint increases the number of parts. Furthermore, the drainage piping structure disclosed in Patent Document 1 involves transporting the manifold joint, connecting vertical pipes, connecting joints, and leg joints to the construction site, (1) cutting the connecting vertical pipes to the optimal length, (2) adhesively joining the cut connecting vertical pipes to the leg joints, (3) adhesively joining the opposite end of the connecting vertical pipe adhesively joined to the leg joint to the connecting joint, (4) adhesively joining the leg joint to the horizontal main pipe, and (5) adhesively joining the opposite end of the connecting joint adhesively joined to the connecting vertical pipe to the manifold joint, completing the construction of the drainage piping structure. In other words, in addition to having to cut the connecting vertical pipes at the construction site, there is the problem of having to adhesively join in four places, which increases the construction time.

The present invention was developed in consideration of the above-mentioned problems, and its purpose is to provide a leg joint and drainage piping structure for the lowest floor that requires fewer parts and shortens construction time at the construction site.

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 leg joint for the lowest floor made of resin, which connects the downstream end of a standpipe piped through each floor to the upstream end of a horizontal main pipe piped horizontally below the floor slab of the lowest floor in the drainage equipment of a building having multiple floors, and which has a longer pipeline on the standpipe side than on the horizontal main pipe side, and which is composed of a plurality of members which are integrated together with adhesive joints, and which includes: a standpipe connection portion to which is connected a substantially cylindrical connection member having at its upper end a standpipe connection member which is connected to the standpipe above the top surface of the floor slab; a horizontal pipe connection portion connected to the horizontal main pipe; a main body portion which includes: a standpipe connection portion to which is connected a substantially cylindrical connection member having at its upper end a standpipe connection member which is connected to the standpipe above the top surface of the floor slab;

Preferably, at least one of the riser pipe connection portion and the riser pipe connection member can be configured to include, in addition to the connection member, a portion that is embedded in the floor slab of the lowest layer.
More preferably, when the thickness of the floor slab is 100 mm or more, the distance between the upper end surface of the vertical pipe connecting member and the lower surface of the floor slab can be configured to be 150 mm or more.
More preferably, the standpipe connection portion and the connection member can be configured to be connected via a substantially annular standpipe receptacle below the upper surface of the floor slab.

More preferably, the standpipe receptacle can be configured to have a protrusion at the lower end on the inner periphery of the substantially annular shape.
More preferably, the standpipe receiving port can be configured to move the pipe core of the standpipe toward or away from the horizontal pipe connecting portion to make the pipe core eccentric.
More preferably, the member located above the standpipe connecting portion can be made of a transparent resin.
More preferably, the standpipe connecting member and the connecting member may be configured to be integrally formed as a connecting member, or to be formed as separate members.

More preferably, at least one of the outer surfaces of the vertical pipe connection portion in the main body, the outer surface of the connection member and the outer surface of the vertical pipe connection member can be configured to have an upper protrusion portion in at least a portion of its circumferential direction that abuts against a hanging support member that supports the leg joint by suspending it from the underside of the floor slab, or a lifting support member that lifts and supports the leg joint from the upper surface of the floor slab.
More preferably, the outer surface of the horizontal pipe connection portion of the main body can be configured to have a lower protrusion in at least a portion of its lower half in the circumferential direction that abuts against a hanging support member that supports the leg joint by suspending it from the underside of the floor slab, or a lower support member that lifts and supports the leg joint from below.

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 below the lowest floor slab, and piping is connected only vertically above the lowest floor slab.
Preferably, in the drainage piping structure relating to this aspect, the hanging support member is arranged in abutment against the upper protrusion portion so that the leg joint is suspended and supported from the underside of the floor slab, or the lifting support member is arranged in abutment against the upper protrusion portion so that the leg joint is lifted and supported from the upper surface of the floor slab.

More preferably, in the drainage piping structure relating to this aspect, the same hanging support member and the same lifting support member can be configured to be used regardless of whether or not an outer layer member is attached to the leg joint, the type of the outer layer member, and the type of vertical pipe connected to the leg joint.
More preferably, in the drainage piping structure relating to this aspect, the hanging support member can be configured to abut against the lower protrusion portion so that the leg joint is suspended and supported from the underside of the floor slab, or the lower support member can be configured to abut against the lower protrusion portion so that the leg joint is lifted from below and supported.

This invention makes it possible to provide a leg joint and drainage piping structure that uses a small number of parts and shortens construction time at the construction site.

1 is a side view (outline view and cross-sectional view) showing a drainage piping structure in which a leg joint according to an embodiment of the present invention is installed close to a thin floor slab of the lowest floor. FIG. 1 is a side view (outline drawing) showing a drainage piping structure in which a leg joint according to an embodiment of the present invention is installed close to a thick floor slab of the lowest floor. FIG. 1 is a side view (cross-sectional view) showing a drainage piping structure in which a leg joint according to an embodiment of the present invention is installed close to a thick floor slab of the lowest floor. FIG. A side view (outline view and cross-sectional view) of a drainage piping structure in which the pipe cores of the vertical pipe and connecting member are off-center relative to the pipe core of the vertical pipe connection part of the leg joint in a leg joint having a connecting member of which length is not limited, and a cross-sectional view and oblique view of the vertical pipe receptacle. A side view (outline drawing and cross-sectional view) of a drainage piping structure in which the pipe cores of the standpipe and connecting member are not eccentric relative to the pipe core of the standpipe connection part of the leg joint in a leg joint equipped with a connecting member whose length is not limited, a cross-sectional view of the standpipe receptacle, and a partial cross-sectional view when the standpipe receptacle is not used. FIG. 1A is a partial cross-sectional view of a drainage piping structure in which the vertical pipe connecting member and the connecting member are (A) formed as separate bodies, and (B) is a partial cross-sectional view of a drainage piping structure in which the vertical pipe connecting member and the connecting member are (B) formed as a single body as a connecting member. This is a diagram showing the state in which the leg joint is lifted and supported from the floor slab by the lifting support member. 1A is a front view of a leg joint having an upper protrusion and a lower protrusion, FIG. 1B is a side view of the leg joint having an eccentricity, and FIG. 1C is a side view of the leg joint without an eccentricity. FIG. 10 is a side view of a leg joint having upper protrusions around the entire circumference. 10B is a two-view diagram of the main body of the leg joint (front outline view and side 10B cross-sectional view). FIG. 10A and 10B are diagrams for explaining a water film cutting protrusion. 10A and 10B are diagrams for explaining a state in which a water film is cut by a water film cutting protrusion. 1 to 4 are diagrams for explaining the reason why the pipe core of the vertical pipe is made eccentric by approaching the horizontal pipe connecting portion. A side view of the main body of the leg joint including an outer layer member, where (A) is a diagram showing the outline of the leg joint plus a cross-sectional view of the outer layer member, and (B) is a diagram showing the cross-sectional view of the leg joint plus a cross-sectional view of the outer layer member. 15A and 15B are side views of the leg joint shown in FIG. 14 with a support member attached, where (A) is a view in which an outline drawing of the leg joint is added to an outline drawing of the support member, and (B) is a view in which a cross-sectional view of the outer layer member is added to the outline drawing of the leg joint (up to this point in FIG. 14A) and a part of the support member is seen through. This is a diagram in which a cross-sectional view of a lower support member is added to FIG. 15(B). This is a side view showing the state in which the leg joint is lifted and supported by a lifting support member using the upper protrusion of the vertical pipe connecting member, and is suspended and supported by a hanging support member using the upper protrusion of the main body. 18 is a side view of the leg joint of FIG. 17 with an outer layer member shown in cross section. This is a side view showing the state in which the leg joint is lifted and supported by the lifting support member using the upper protrusion of the vertical pipe connecting member, and is suspended and supported by the hanging support member using the lower protrusion of the main body. A side view showing the state in which the leg joint is suspended and supported by a hanging support member using the upper protrusion of the main body part, and also suspended and supported by a hanging support member using the lower protrusion of the main body part. This figure shows the state in which the leg joint is suspended and supported by a suspension support member using the upper protrusion of the main body, and is supported downward from the floor slab by a lower support member using the lower protrusion of the main body. 1 is a side view (outline drawing) showing a drainage piping structure in which a leg joint according to an embodiment of the present invention is installed close to a thin floor slab of the lowest floor. FIG.

The leg joint 100 according to an embodiment of the present invention will be described in detail below with reference to Figures 1 to 21. The drainage piping structure according to an embodiment of the present invention is constructed by installing the leg joint 100 according to the present embodiment shown in Figures 1(B), 3 to 6, and 8 to 16 under the lowest floor slab S of a building, as shown in Figures 1(A), 2, 7, and 17 to 21. The piping is connected only vertically above the lowest floor slab S, and the thermal expansion material TE is installed at the level of the floor slab S, as shown in Figures 1 and 2. Furthermore, the gap between the drainage piping and the through-hole in the floor slab S through which the drainage piping passes 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 thermally expandable refractory material may not be clearly distinguished from each other. Also, in cross-sectional views, different components may not be clearly distinguished by the type of hatching. Furthermore, in the drawings referenced in the following description, for ease of understanding, some parts that should be represented by their external shapes rather than their internal shapes may be depicted as if they are seen through the interior, some parts that should be represented by their cross sections may be depicted by their external shapes rather than their external shapes, some parts that should be represented by their external shapes rather than their cross sections may be depicted by their cross sections, some cross sections may not be hatched, and some parts may not be cross sections but are hatched. Detailed structure may be omitted, and some drawings may not match the same components due to the omission or modification of detailed structure. Furthermore, break lines may not be indicated. In the following description, floor slab S refers to the lowest floor slab S, even if it is not preceded by the lowest layer designation.

<Outline of leg joint 100 and support structure>
1 to 21, a leg joint 100 according to this embodiment and a support structure for the leg joint 100 will be outlined below.
As shown in these figures, this leg joint 100 is a resin leg joint that connects the downstream end of a vertical pipe 1100 that is piped through each floor in the drainage system of a building with multiple floors to the upstream end of a horizontal main pipe 1200 that is piped horizontally below the floor slab S (thickness t(S)) of the lowest floor.

This leg joint 100 comprises a main body 101 that includes a standpipe connection section 110 to which is connected a generally cylindrical connection member 310 having a standpipe connection member 320 at its upper end that is connected to a standpipe 1100 above the upper surface of the floor slab S, a horizontal pipe connection section 120 that is connected to a horizontal main pipe 1200, and a curved pipe-shaped bend section 130 that changes direction so that the pipe axis direction of the standpipe connection section 110 and the pipe axis direction of the horizontal pipe connection section 120 are perpendicular to each other, connecting the standpipe connection section 110 and the horizontal pipe connection section 120. In addition to this main body 101, the leg joint 100 further includes the standpipe connection member 320 and the connection member 310 described above. In this way, the leg joint 100 is composed of these multiple components (in addition to the main body 101, standpipe connection member 320, and connection member 310 described above, it may also include the standpipe socket 300 described below, and the standpipe connection member 320 may also be the connection member 311 configured as part of the connection member), and these multiple components are joined together at adhesive joints using adhesive or the like to form a single unit. The leg joint 100 may also include outer layer components (such as vibration damping material 160, vibration insulator (sound absorbing material 150), and sound insulating material 152) described below. A distinctive feature of the structure is that the connection member 310 has a portion embedded in the lowest floor slab S.

In this way, the main body 101, the stand pipe connection member 320, and the connection member 310 (and the stand pipe receptacle 300) of the leg joint 100 are joined together at adhesive joints at a manufacturing site, not at a construction site, and therefore, at the construction site, the construction of the drainage piping structure can be completed with only two connections: connecting the stand pipe 1100 to the stand pipe connection member equivalent portion of the stand pipe connection member 320 of the leg joint 100 or the connection member 311 (in which the stand pipe connection member and the connection member are integrated as a connection member), and connecting the horizontal main pipe 1200 to the horizontal pipe connection portion 120 of the main body 101 of the leg joint 100. Furthermore, because the connection member 310 has a portion that is embedded in the floor slab S of the lowest layer, the leg joint 100 can be constructed close to the underside of the floor slab S, and the fitting dimension L(1) can be reduced. For example, when the nominal diameter of the horizontal main pipe 1200 is 150A, and the connecting member 310 (only) has a portion that is embedded in the lowest floor slab S, as shown in Figure 22, the fitting dimension L(1) is 323 mm, which is the best fitting case in the construction example using the leg joint 100 of this embodiment.

In addition, at least one of the riser pipe connection portion 110 and the riser pipe connection member 320 has a portion that is embedded in the floor slab S of the lowest layer in addition to the connection member 310.
For example, an example of a drainage piping structure in which only the connecting member 310 is embedded in the floor slab S of the lowest layer is shown in Figures 17, 18, and 22, an example of a drainage piping structure in which the connecting member 310 and the standpipe connection portion 110 of the main body 101 are embedded in the floor slab S of the lowest layer is shown in Figures 7 and 19, an example of a drainage piping structure in which the connecting member 310 and the standpipe connection member 320 are embedded in the floor slab S of the lowest layer is shown in Figures 20 and 21, and an example of a drainage piping structure in which the connecting member 310, the standpipe connection portion 110 of the main body 101, and the standpipe connection member 320 are embedded in the floor slab S of the lowest layer is shown in Figures 1(A) and 2, respectively.

In this way, since at least a portion of the connecting member 310 is embedded in the floor slab S of the lowest layer, the leg joint 100 can be installed close to the underside of the floor slab S.
As shown in Figures 1(A) and 2, when the thickness t(S) of the lowest floor slab S is 100 mm or more, the distance L(B) between the upper end surface of the stand pipe connection member 320 and the underside of the lowest floor slab S is 150 mm or more. The nominal diameter of the horizontal main pipe 1200 is 150A. Furthermore, the distance L(2) between the pipe core of the horizontal pipe connection portion 120 of the main body 101 of the leg joint 100 and the underside of the lowest floor slab S is 89 mm or more. In this way, the leg joint 100 can be installed close to the underside of the floor slab S.

Here, t(S) < L(B) holds true because the standpipe 1100 is connected to the standpipe connecting member 320 above the top surface of the lowest floor slab S. Furthermore, because the standpipe 1100 is connected to the standpipe connecting member 320 (which is one component of the leg joint 100) above the top surface of the lowest floor slab S at the construction site (it is not connected within the floor slab S), it becomes easy to confirm whether the standpipe 1100 and leg joint 100 are securely connected, thereby preventing problems such as water leaks.

The standpipe connection portion 110 of the main body 101 and the connection member 310 are connected below the top surface of the lowest floor slab S via a substantially annular standpipe receptacle 300. Note that this standpipe receptacle 300 is an optional component of the leg joint 100, and it is also possible to adhesively join the standpipe connection portion 110 of the main body 101 and the connection member 310 (more specifically, connection member 316, which has a different pipe diameter than connection members 312 and 314) without using a standpipe receptacle (as shown in Figure 5(D)).

This standpipe socket has projections 300T (four in this case at 90-degree intervals) at the lower end of the inner periphery of its substantially annular shape (as shown in Figures 4(C), 4(D), 5(C), etc.). Therefore, the connecting member 310 can be positioned in the up-down direction simply by inserting it until the lower end of the connecting member 310 abuts against the projections 300T.
The standpipe receptacle 300 includes a standpipe receptacle 304 (shown in FIGS. 1 to 4) that moves the pipe core of the standpipe 1100 closer to or farther from the horizontal pipe connecting portion 120 to be eccentric, and a standpipe receptacle 302 (shown in FIG. 5) that does not move the pipe core toward or away from the horizontal pipe connecting portion 120. As shown in FIGS. 1 to 6, the pipe core of the standpipe 1100 is assumed to be aligned with the pipe core of the connecting member 310 and the pipe core of the standpipe connecting member 320.

Furthermore, standpipe receptacle 304 corresponds to standpipe 1104 with a nominal diameter of 100A. In this case, the connecting member is connecting member 314 and the standpipe connecting member is standpipe connecting member 324. Standpipe receptacle 302 corresponds to standpipe 1102 with a nominal diameter of 125A. In this case, the connecting member is connecting member 312 and the standpipe connecting member is standpipe connecting member 322. Note that when describing standpipe 1104 and standpipe 1102 without distinguishing between them, it will be referred to as standpipe 1100; when describing standpipe receptacle 304 and standpipe receptacle 302 without distinguishing between them, it will be referred to as standpipe receptacle 300; when describing connecting member 314 and connecting member 312 without distinguishing between them, it will be referred to as connecting member 310; and when describing standpipe connecting member 324 and standpipe connecting member 322 without distinguishing between them, it will be referred to as standpipe connecting member 320.

In the leg joint 100, the member located above the standpipe connection part 110 of the main body part 101 is made of transparent resin. This allows visual confirmation when connecting the piping on site, making installation easier.
The standpipe connecting member 320 and the connecting member 310 are formed integrally as a connecting member 311 as shown in Fig. 6(B), or are formed separately as shown in Fig. 6(A). Note that, for connection to the standpipe 1100, it is also preferable to attach a rubber ring to the upper space 320G of the standpipe connecting member 320 or the upper space 311G of the part of the connecting member 311 that corresponds to the standpipe connecting member, and connect the standpipe 1100 with the rubber ring.

At least one of the outer circumferential surfaces of the standpipe connection portion 110 of the main body 101, the outer circumferential surface of the connection member 310, and the outer circumferential surface of the standpipe connection member 320 is provided with an upper protrusion 112 at at least a portion of its circumference. In FIG. 8, the outer circumferential surface of the standpipe connection portion 110 of the main body 101 and the outer circumferential surface of the standpipe connection member 320 are provided with an upper protrusion 112. The upper protrusion 112 of the standpipe connection portion 110 may also be referred to as the upper protrusion 112 of the main body 101. Furthermore, since the upper protrusion 112 provided at at least one of the outer circumferential surfaces of the main body 101, the outer circumferential surface of the connection member 310, and the outer circumferential surface of the standpipe connection member 320 share the same characteristics except for the outermost diameter length LL shown in FIG. 8, the upper protrusion 112 provided on the outer circumferential surface of the standpipe connection portion 110 of the main body 101 will be used as a representative and will be described in detail below with reference to FIGS. 10 and 14-16. The upper protrusion 112 is abutted against a hanging support member 170D that suspends and supports the leg joint 100 from the underside of the floor slab S as shown in Figures 17, 18, 20, and 21, or a lifting support member 170U that lifts and supports the leg joint 100 from the top surface of the floor slab S as shown in Figures 7, 17, 18, and 19. Note that, for reasons described below (the same (type of) support member can be used regardless of the presence or type of outer layer member, so that the band portion 172 of the support member 170 abuts against the upper protrusion 112 exposed from the outer layer member), when the hanging support member 170D and the lifting support member 170U are not distinguished, they will be referred to as support member 170.

A lower protrusion 122 is provided on at least a portion of the lower circumferential half of the outer peripheral surface of the horizontal pipe connection portion 120 of the main body 101. The lower protrusion 122 is abutted by a hanging support member 180D that supports the leg joint 100 by suspending it from the underside of the floor slab S, as shown in Figures 19 and 20, or a lower support member 180US that supports the leg joint 100 by lifting it from below (here, the concrete foundation C below the lowest floor slab S), as shown in Figure 21. For reasons described below (support stabilization due to abutment of horizontal surfaces), when the hanging support member 180D and the lower support member 180US are described without distinction, they will be referred to as support member 180.

This lower protrusion 122 has two or more rib shapes (four are shown in Figure 8(B) and elsewhere). The lower protrusion 122 is located closer to the horizontal pipe connection part 120 than the pipe core of the stand pipe connection part 110. Furthermore, this lower protrusion 122 has a horizontal surface 122L (shown in the enlarged view of Figure 8(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 Figure 16) of the support member 180 (here, an angle bar), allowing the support member 180 to stably support the leg joint 100.

Note that the lifting support member 170U is fixed with a nut N to a short cut bolt (fully threaded bolt) B erected from a bolt base BB provided on the upper surface of the floor slab S, while the hanging support member 170D is supported by an anchor bolt (sleeve) AB embedded in the underside of the floor slab, which is fixed with a nut N to a short cut bolt B. However, because the lifting support member 170U and the hanging support member 170D are the same in the following respects, they will be referred to simply as support member 170 when there is no need to distinguish between them.

The band portion 172 (e.g., a combination of semicircular bands) of the support member 170 is abutted against the upper protrusion 112 (which is exposed from the outer layer member as described below), and the support member 170 is attached to the leg joint 100 using the fastening member 174 (e.g., a member that threads together the combination of semicircular bands with a bolt and nut). The support member 170 also has a circular cut bolt hole portion through which a cut bolt B can be inserted when the combination of semicircular bands is integrated.

Furthermore, the lower support member 180US provides downward support from a concrete foundation C further below the floor slab S, while the hanging support member 180D is supported by anchor bolts AB embedded in the underside of the floor slab, secured to long cut bolts B with nuts N. However, the lower support member 180US and the hanging support member 180D are similar in that they achieve stable support by having horizontal surface 180L abut against horizontal surface 122L of lower protrusion 122, and therefore will be referred to simply as support member 180 when there is no need to distinguish between them.

As will be described in more detail below, this leg joint 100 further includes an outer layer member (more specifically, sound-absorbing material 150 shown in Figure 14, etc.) to achieve at least sound insulation, and the (outermost diameter of) this upper protrusion 112 protrudes beyond the outer peripheral surface of the outer layer member (the outermost diameter of sound-absorbing material 150). Furthermore, although not limited to this, the 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 Figures 8 and 10(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 at four locations, spaced 90 degrees apart where the upper protrusion 112 is located, each opening having a width slightly larger than the width W and a height slightly larger than the height H. The outer layer member and the upper protrusion 112 do not overlap, and the upper protrusion 112 is located at the outermost position where it is supported by the support member 170 (thickness of the outer layer member < length L of the upper protrusion 112). The support member 170 is composed of, for example, the band portion 172 and fastening member 174 shown in Figure 7. Since the height of the band portion 172 is approximately 30 mm, the height H of the upper protrusion 112 is preferably approximately 12 mm to 20 mm.

For this reason, even if the outer diameter of the leg joint 100 at the position supported by the support member 170 varies due to (1) whether or not an outer layer member (such as 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 collecting pipe connected to the leg joint is different, the same support member 170 can be used because the support member 170 is installed in contact with 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 locations are supported using a single upper support member 170) and that the specifications of the upper support member 170 can be standardized.

In the case of (3) above, the outermost diameter lengths LL of the upper protrusions 112 must be the same. This (3) means that LL(1) = LL(2) = LL(3) in Figure 8. However, this embodiment includes construction drawings (Figures 17 to 21) that do not satisfy this (3). This point will not be explained again below.
Furthermore, since the outer layer member has an opening, positioning can be performed reliably and easily by aligning the opening with the position of the upper protrusion 112 .

In a drainage piping structure using a leg joint 100 having such an upper protrusion 112, the leg joint 100 can be stably supported by a configuration in which a hanging support member 170D for supporting the leg joint 100 by suspending it from the underside of the floor slab S abuts the upper protrusion 112, and the leg joint 100 is stably supported, or a lifting support member 170U for lifting and supporting the leg joint 100 from the upper surface of the floor slab S abuts the upper protrusion 112, and the leg joint 100 can be stably supported.
In this case, the same (type of) 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 vertical pipe 1100 connected to the leg joint 100.

In a drainage piping structure using a leg joint 100 equipped with such a lower protrusion 122, the leg joint 100 can be stably supported by abutting the lower protrusion 122 with a suspension support member 180D for suspending and supporting the leg joint 100 from the underside of the floor slab S, or by abutting the lower protrusion 122 with a lower support member 180US for supporting the leg joint 100 from below (for example, a concrete foundation C below the lowest floor slab S), thereby stably supporting the leg joint 100.

This upper protrusion 112 is located above the pipe core of the horizontal pipe connection part 120. This is advantageous in that the leg joint 100 can be suspended from the floor slab using anchor bolts AB and short cut bolts B, etc., embedded in the underside of the floor slab (second floor floor slab S2). In other words, compared to the suspension support structure using the suspension support member 180D with the lower protrusion 122 shown in Figure 20, the suspension support structure using the suspension support member 170D with the upper protrusion 112 requires shorter cut bolts B and is therefore more stable.

The leg joint 100 also includes an outer layer member for achieving at least sound insulation and vibration damping. Here, the vibration damping material 160 and vibration insulator (sound absorbing material 150) are considered essential, with sound insulating material 152 being optional. Examples of these materials include butyl rubber for the vibration damping material 160, polyethylene terephthalate felt (a nonwoven fabric made of PET) for the sound absorbing material 150, and soft polyvinyl chloride for the sound insulating material 152. In this leg joint 100, the vibration damping material 160 is present at the curved surface of the bend section 130 (the location where the wastewater flowing down the standpipe hits), while the vibration damping material 160 as an outer layer member for achieving vibration damping is not present at the location of the lower protrusion 122. Instead, 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 achieving sound insulation. In other words, the lower protrusion 122 does not overlap the vibration-damping material 160, but does overlap at least the sound-absorbing material 150, and therefore the lower protrusion 122 abuts against the 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 protrusion 140 (shown in FIG. 11 etc.) for cutting the water film on the main body 101. This water film cutting protrusion 140 is provided at or near the intersection of the pipe wall of the stand pipe connecting part 110 on the side of the horizontal pipe connecting part 120 and the pipe wall of the horizontal pipe connecting part 120 on the side of the stand pipe connecting part 110.
Because the water film cutting projection 140 can cut the water film formed by the wastewater that falls from the standpipe onto the leg joint, the water film formed by the wastewater that falls from the standpipe onto the leg joint 100 is cut (an air layer is maintained within the leg joint 100 when the wastewater is discharged from the standpipe, preventing the leg joint 100 from being filled with wastewater). This makes it difficult for negative pressure to form within the standpipe even when the wastewater is discharged from the leg joint 100 at high speed, and it makes it difficult for positive pressure to form within the standpipe even when the wastewater is discharged from the leg joint 100 at low speed, thereby preventing unexpected negative or positive pressure within the standpipe. This prevents water seal failure, which would otherwise occur if the water accumulated in the drain trap is sucked into the standpipe due to high negative pressure within the standpipe, or if the water accumulated in the drain trap is sprayed into the room due to high positive pressure within the standpipe.

This water film cutting protrusion 140 is formed from a single protrusion and has a substantially triangular shape in a front view looking from the pipe core of the stand pipe connection part 110 toward the horizontal pipe connection part 120 (as shown in the enlarged view of area A(1) in Figure 11). In this way, the water film cutting protrusion 140 is provided on the thick-walled main body part of the leg joint 100 (rather than being a separate part from the main body part of the leg joint) and is integrated with the main body part of the leg joint 100. This eliminates the need to prepare the water film cutting protrusion 140 separately from the main body part of the leg joint 100, and since the water film cutting protrusion 140 is integrated with the thick-walled main body part, sufficient strength can be ensured. Furthermore, the water film cutting protrusion 140 has a substantially triangular cross section, and despite being 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 addition, in order to ensure that the flowing water hits the water film cutting projection 140, the leg joint 100 has the following configuration.

The leg joint 100 further includes a standpipe socket 300 provided between the standpipe or collecting pipe and the standpipe connection portion 110. This standpipe socket 300 can move the pipe core of the standpipe or collecting pipe toward the horizontal pipe connection portion 120 (as shown in FIG. 13(A)) or away from it (as shown in FIG. 13(B)) to achieve eccentricity. Here, when the inner diameter of the standpipe is smaller than the inner diameter of the standpipe connection portion 110, the standpipe socket 300 moves the pipe core of the standpipe or collecting pipe toward the horizontal pipe connection portion 120 to achieve eccentricity. For example, when the standpipe connection portion 110 corresponds to a standpipe with a nominal diameter of 125A and a standpipe with a nominal diameter of 100A is to be connected to the standpipe connection portion 110, the standpipe socket 304 (shown in FIGS. 1 to 4) is used to move the pipe core of the standpipe toward the horizontal pipe connection portion 120 (as shown in FIG. 13(A)) to achieve eccentricity. Therefore, even if the diameter of the standpipe connected to the leg joint 100 is smaller, as long as a different standpipe receptacle 300 is prepared using the same main body 101, the flowing water can be reliably directed at the water film cutting protrusion 140.

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 water film cutting protrusion on the adapter body of an adapter that includes an adapter body, an elastic ring, and a fixing member, and is composed of four parts. On the other hand, the leg joint 100 of this embodiment is composed of two parts: the leg joint 100 with a water film cutting protrusion 140 on its main body, and a standpipe receptacle 300 that is prepared for each standpipe diameter. Therefore, the leg joint 100 of this embodiment (in addition to being strong) has a small number of parts, reducing the assembly process.

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 becomes smaller, the reason why it is preferable to have it 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 explained later.
In a drainage piping structure using a leg joint 100 equipped with such a water film cutting protrusion 140, if the inner diameter of the standpipe is smaller than the inner diameter of the standpipe connection part, the pipe core of the standpipe can be brought close to the horizontal pipe connection part and installed eccentrically.Even if the pipe diameter of the standpipe connected to the leg joint 100 becomes small, a drainage piping structure can be realized in which 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.

<Details of the leg joint 100 and support structure>
The structure of the leg joint 100 according to this embodiment and the support structure for the leg joint 100 will be described in more detail below.
As shown in Figures 1 to 3, this leg joint 100 includes a main body 101 (having a standpipe connection portion 110, a horizontal pipe connection portion 120, and a bend portion 130), a standpipe connection member 320, and a connection member 310 (it may further include a standpipe receptacle 300, or the standpipe connection member may be integrated as a connection member 311). The area indicated by the double-arrowed dotted line in Figures 1 to 3 is the range of the leg joint 100. For this reason, this leg joint 100 is a leg joint that is sometimes called a long-neck bend, in which the vertical length L(V) is longer than the horizontal length L(H) (L(V) > L(H)). In any of the cases shown in Figures 1 to 3, the multiple components that make up the leg joint 100 (which may include the main body 101, the standpipe connecting member 320, the connecting member 310, and the standpipe receptacle 300, and the standpipe connecting member 320 may be the connecting member 311 configured as part of the connecting member) are joined together at the adhesive joint with adhesive or the like at the manufacturing site, integrated, and then transported to the construction site.

Once the leg joint 100 is delivered to the construction site, the standpipe connection member 320 (which may be the standpipe connection member portion of the connection member 311, in which the standpipe connection member and the connection member are integrated) that forms an integral part of the leg joint 100 is connected to the standpipe 1100 using a rubber ring. The horizontal main pipe 1200 is then connected to the horizontal pipe connection portion 120 of the main body 101 of the leg joint 100, completing the two connection points that make up the drainage piping structure. Support work is then carried out so that the support member 170 (hanging support member 170D, lifting support member 170U) and/or support member 180 (hanging support member 180D, lower support member 180US) is supported by the floor slab S via the cut bolts B, and/or by the concrete foundation C below the lowest floor slab S.

As a result of these connection and support operations, it is possible to realize drainage piping structures in which only the connecting member 310 is partially embedded in the floor slab S of the lowest level, as shown in Figures 17, 18, and 22; drainage piping structures in which the connecting member 310 and the standpipe connection portion 110 of the main body 101 are partially embedded in the floor slab S of the lowest level, as shown in Figures 7 and 19; drainage piping structures in which the connecting member 310 and the standpipe connection member 320 are partially embedded in the floor slab S of the lowest level, as shown in Figures 20 and 21; and drainage piping structures in which the connecting member 310, the standpipe connection portion 110 of the main body 101, and the standpipe connection member 320 are partially embedded in the floor slab S of the lowest level, as shown in Figures 1(A) and 2. Because at least the connecting member 310 is partially embedded in the floor slab S of the lowest level, the leg joint 100 can be installed close to the underside of the floor slab S.

The cross-sectional views of FIG. 1B and FIGS. 3 to 5 show the inner diameter of the pipe, although this is only an example.
The leg joint 100 of this embodiment has the above-mentioned features of the upper protrusion 112, the lower protrusion 122, the water film cutting protrusion 140, and the outer layer members (vibration damping material 160, vibration insulator (sound absorbing material 150), sound insulation material 152), and the leg joint 100 shown in any other than Figure 5 (D) has a stand pipe receiving port 300 that can offset the stand pipe 1100 connected to the leg joint 100.

Next, we will explain this standpipe socket 300. Figure 5 shows a standpipe socket 302 used when the standpipe 1102 connected to the leg joint 100 is not eccentric, while Figures 1 to 4 show a standpipe socket 304 used when the standpipe 1104 connected to the leg joint 100 is eccentric. Here, we will assume that the nominal diameter of the standpipe 1102 is 125A and the nominal diameter of the standpipe 1104 is 100A.

The standpipe receptacle 302 and standpipe receptacle 304, which have different structures, are used in the non-eccentric state shown in Figure 5 and the eccentric state shown in Figures 1 to 4. Both the standpipe receptacle 302 and standpipe receptacle 304 have a generally hollow cylindrical shape, but the standpipe receptacle 302 shown in Figure 5(C) does not have the space 304S that the standpipe receptacle 304 shown in Figure 4(C) has. This space 304S allows the standpipe receptacle 304 to move the pipe core of the standpipe 1104 closer to or farther away from the horizontal pipe connection portion 120, resulting in eccentricity (although it is shown close in Figures 1 to 4). Note that in the state shown in Figure 4, if the standpipe receptacle 304 is connected to the standpipe connection portion 110 of the leg joint 100 with the left and right reversed, the pipe core of the standpipe 1104 can be moved away from the horizontal pipe connection portion 120, resulting in eccentricity.

Next, the upper protrusion 112 and the lower protrusion 122 will be described with reference to Figures 8 and 10. The upper protrusion 112 is provided on at least one portion of the circumferential direction of the outer circumferential surface of the standpipe connecting portion 110 in the main body 101, the outer circumferential surface of the connecting member 310, and the outer circumferential surface of the standpipe connecting member 320. Here, as shown in Figure 8, the upper protrusion 112 is provided on the outer circumferential surface of the standpipe connecting portion 110 in the main body 101 and the outer circumferential surface of the standpipe connecting member 320, respectively. The upper protrusion 112 provided on the outer peripheral surface of the riser pipe connection portion 110 in the main body portion 101 shown in Figure 8 and the upper protrusion 112 provided on the outer peripheral surface of the riser pipe connection member 320 (and further the upper protrusion 112 provided on the outer peripheral surface of the connection member 310, not shown) are the same except for the outermost diameter length LL of the upper protrusion 112, which is different (here, as an example, LL(1) > LL(3) > LL(2)).Therefore, in the following, when explaining the upper protrusion 112, the upper protrusion 112 provided on the outer peripheral surface of the riser pipe connection portion 110 in the main body portion 101 will be used as a representative and will be explained with reference to Figures 10 and 14 to 16. Furthermore, by making LL(1), LL(2), and LL(3) shown in Figure 8 equal, it is possible to use the same (type of) support member 170 for the support member 170 provided in contact with the upper protrusion 112 on the outer peripheral surface of the standpipe connection portion 110 in the main body 101, and for the support member 170 provided in contact with the upper protrusion 112 on the outer peripheral surface of the standpipe connection member 320 (and also for the support member 170 provided in contact with the upper protrusion 112 on the outer peripheral surface of the connection member 310 (not shown)). This is advantageous in that it allows the same (type of) support member 170 to be used.

As shown in the front outline views of the leg joint 100 shown in Figures 8(A) and 10(A) (viewed from the direction of the white arrow shown in Figure 10(B)) and Figure 8(B), the upper protrusion 112 has a width W and a height H, and also has a length L that protrudes beyond the outer layer member provided on the leg joint 100. Because an opening (slightly larger than the width W and height H) is provided in the outer layer member at the position of the upper protrusion 112, the upper protrusion 112 is configured to always abut against the band portion 172 of the support member 170, as shown in the enlarged view of Figure 14(A). That is, 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 support member 170 varies 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 being different, or (3) the type of standpipe 1100 connected to the leg joint being different, the same (type of) support member 170 can be used because the support member 170 is abutted against the upper protrusion 112.

On the other hand, as shown in the front outline view of the leg joint 100 in Figure 10(A), the lower protrusion 122 is formed in a rib-like shape extending downward from the arc-shaped bend portion 130 that constitutes the main body 101 of the leg joint 100. As shown in Figure 10(A), this lower protrusion 122 has a horizontal surface 122L that is parallel to the slab that forms the floor or ceiling of each floor of the building. A leg joint 100 that has a lower protrusion 122 that is linear rather than arc-shaped can be stably supported by a support member 180 such as an angle iron.

In addition, since the upper protrusion 112 provided on the outer peripheral surface of the riser pipe connection portion 110 of the main body portion 101 of the leg joint 100 is provided on at least a portion of its circumference, it may be provided on the entire circumference like the upper protrusion 113 provided on the main body portion 101 (of the riser pipe connection portion 110) of the leg joint 103 shown in Figure 9 and/or the upper protrusion 113 provided on the riser pipe connection member 323 of the leg joint 103 shown in Figure 9.

Next, the water film cutting protrusion 140 will be described with reference to Figures 11 to 13. Figure 11 shows views from various directions of the water film cutting protrusion 140 provided on the main body 101 of the leg joint 100. More specifically, in Figure 11, the upper left figure shows a front view of the water film cutting protrusion 140, the upper right figure shows a rear view of the water film cutting protrusion 140, and the lower right figure shows a bottom view of the water film cutting protrusion 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 its approximately triangular shape allows it to efficiently cut the water film, creating a space below the water film cutting protrusion 140 through which air can pass.
The state of the water film when the water film cutting protrusion 140 is not present is shown in FIG. 12(A), and the state of the water film when the water film cutting protrusion 140 is present is shown in FIG. 12(B).

As shown in Figure 12 (A), if the water film cutting protrusion 140 is not present, a water film is formed by the wastewater that falls from the standpipe onto the leg joint, and no air passage exists (an air layer cannot be secured). If an air layer cannot be secured within the leg joint when draining water from the standpipe, the leg joint will be filled with wastewater. If the wastewater is discharged from the leg joint at high speed, negative pressure will likely develop within the standpipe. If the wastewater is discharged from the leg joint at low speed, positive pressure will likely develop within the standpipe, resulting in unexpected negative or positive pressure within the standpipe. High negative pressure within the standpipe can cause water accumulated in the drain trap to be sucked into the standpipe, or high positive pressure within the standpipe can cause water accumulated in the drain trap to spray out into the room, resulting in a water seal failure.

On the other hand, as shown in Figure 12 (B), when a water film cutting protrusion 140 is present, the drainage flow that flows down from the vertical pipe to the leg joint hits the water film cutting protrusion 140, causing the drainage flow to split into two, ensuring an air passage, thereby preventing the seal water from breaking.
In order to prevent problems such as seal water breakdown, it is necessary to ensure that the drainage flow hits the water film breaking projection 140, and therefore, as shown in Figures 1 to 4, a standpipe receptacle 304 is used to move the pipe core of the standpipe close to the horizontal pipe connecting part 120 (as shown in Figure 13(A)) and make it eccentric, as shown in Figures 1 to 4. Here, in addition to the effect of ensuring that the flowing water hits the water film breaking projection 140, when the pipe diameter of the standpipe connected to the leg joint 100 becomes small, the reason why it is preferable to move the standpipe close to the horizontal pipe connecting part 120 (as shown in Figure 13(A)) rather than away from it (as shown in Figure 13(B)) will be explained.

As shown in Figure 13(B), if the pipe is offset outward, the distance WL until the drain hits the main body 101 (bend portion 130) of the leg joint 100 becomes shorter, narrowing the drain space WS. If this drain space WS is narrow, the air passage in the standpipe is likely to become blocked, which can easily lead to the generation of excessive positive pressure.
On the other hand, as shown in Figure 13(A), when the centerline is offset inward, the distance WL until the drainage water hits the main body 101 (bend portion 130) of the leg joint 100 becomes longer, and the drainage space WS becomes wider. If this drainage space WS is wider, the air passage in the standpipe is less likely to be blocked, which makes it less likely to lead to the generation of excessive positive pressure.

Next, with reference to Figure 14 (partly to Figure 10), the relationship between the upper protrusion 112 and the band portion 172 of the 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 Figure 10(A), the upper protrusion 112 has a width W and a height H, and a length L that protrudes beyond the outer layer member (only the sound-absorbing material 150 is shown in the enlarged view of Figure 14(A)) provided on the leg joint 100. Because 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 support member 170, as shown in the enlarged view of Figure 14(A). Therefore, the same (type of) 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, or the type of standpipe or collecting pipe connected to the standpipe connection part 110.

Next, referring to Figure 15, the state in which the support member 170 is attached to the leg joint 100 will be described. As shown in the enlarged view of Figure 14(A) above, when the leg joint 100 includes an outer layer member (here, sound-absorbing material 150), the upper protrusion 112 protrudes from the opening of the outer layer member, with its tip protruding and exposed beyond the outer layer member. In this state, the band portion 172 (e.g., a combination of semi-annular bands) of the support member 170 abuts against the tip of the upper protrusion 112, and the support member 170 is attached to the riser pipe connection portion 110 of the main body portion 101 of the leg joint 100 by the fastening member 174 of the support member 170 (e.g., a member that threads together the combination of semi-annular bands with a bolt and nut). In this case, it is preferable that the same (type of) 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, or the type of standpipe or collecting pipe connected to the standpipe connection part 110. Furthermore, this support member 170 has a circular cut bolt hole portion through which cut bolt B can be inserted when the combination of semicircular bands is integrated.

Next, referring to Figure 16, we will explain the state in which the support member 180 is attached (abutted) to the leg joint 100. As shown in Figure 16, in this leg joint 100, vibration-damping material 160 is present on the curved surface of the bend section 130 (the position where the wastewater flowing down the standpipe hits), and vibration-damping material 160 as an outer layer member for achieving vibration control is not present at the position of the lower protrusion 122 where the support member 180 is attached. Instead, sound-absorbing material 150 or sound-insulating material 152 in addition to sound-absorbing material 150 is present as an outer layer member for achieving sound insulation (in the enlarged view of Figure 16, sound-insulating material 152 in addition to sound-absorbing material 150). Because the lower protrusion 122 has a horizontal surface 122L, as shown in Figure 16, the horizontal surface 180L of a support member 180, such as an angle bar, can abut against this horizontal surface 122L for stable support. Furthermore, this support member 180 stably supports the bent portion of the main body 101 of the leg joint 100, and is supported by a support structure described below, either suspended from the lowest floor slab S (as a hanging support member 180D) or supported from a concrete foundation C below the lowest floor slab S (as a lower support member 180US).

Next, the support structure of the leg joint 100 will be described with reference to Figures 7 and 17 to 21. Figure 7 shows a leg joint 100 without an upper protrusion 112, a lower protrusion 122, or an outer layer member, lifted and supported from the floor slab S by a lifting support member 170U at the position of the stand pipe connection member 320. Figure 17 shows the leg joint 100 lifted and supported by the lifting support member 170U using the upper protrusion 112 of the stand pipe connection member 320, and suspended and supported by a suspension support member 170D using the upper protrusion 112 of the main body 101. Figure 18 shows the case in which the leg joint 100 in Figure 17 is equipped with an outer layer member as shown in cross section. Figure 19 shows the leg joint 100 lifted and supported by the lifting support member 170U using the upper protrusion 112 of the stand pipe connection member 320. FIG. 20 shows the leg joint 100 being supported by the suspension support member 170D using the upper protrusion 112 of the main body 101, and also being supported by the suspension support member 170D using the lower protrusion 122 of the main body 101. FIG. 21 shows the leg joint 100 being supported by the suspension support member 170D using the upper protrusion 112 of the main body 101, and also being supported downward from the concrete foundation C below the lowest floor slab S by the lower support member 180US using the lower protrusion 122 of the main body 101.

The lifting support from the floor slab S by the lifting support member 170U is performed by inserting a cut bolt B into the cut bolt hole of the support member 170, which is attached so that the inner surface of the band portion 172 abuts against the upper protrusion portion 112 of the vertical pipe connection member 320 of the leg joint 100, and screwing it in with a nut N, thereby lifting and supporting from the floor slab S.
The hanging support from the floor slab S by the hanging support member 170D is achieved by inserting a cut bolt B (shorter than the cut bolt B for hanging support by the hanging support member 180D) into the cut bolt hole of the support member 170, which is attached so that the inner surface of the band portion 172 abuts against the upper protrusion portion 112 of the vertical pipe connection portion 110 of the main body portion 101 of the leg joint 100, and screwing it in with a nut N, thereby providing hanging support from the floor slab S.

The hanging support from the floor slab S by the hanging support member 180D is achieved by abutting the horizontal surface 180L of a support member 180 such as an angle iron against the horizontal surface 122L of the lower protrusion 122 of the horizontal pipe connection part 120 of the main body 101 of the leg joint 100, and a cut bolt B is inserted into a bolt hole provided in the horizontal surface 122L and screwed in with a nut N, thereby hanging and supporting from the floor slab S.
The lower support member 180US lifts and supports the lowest floor slab S from the concrete foundation C or the like below by abutting the horizontal surface 180L of the support member 180 such as an angle iron against the horizontal surface 122L of the lower protrusion 122 of the horizontal pipe connection part 120 of the main body 101 of the leg joint 100, and the end of the vertical surface abuts against the concrete foundation C or the like, thereby lifting and supporting from the concrete foundation C or the like.

Here, it is preferable that the support member 170 provided in contact with the upper protrusion 112 and/or the support member 180 provided in contact with the lower protrusion 122 be provided with vibration-damping rubber or the like having vibration-damping properties.
Furthermore, as shown in Figures 17, 18, 20 and 21, when the vertical pipe connection portion 110 of the main body 101 of the leg joint 100 is not embedded in the floor slab S, it is preferable in that it can be quickly changed from lifting support from the floor slab S by a lifting support member 170U above the slab S to hanging support from the floor slab S by a hanging support member 170D below the slab S.

As described above, the leg joint 100 of this embodiment and the drainage piping structure in which the leg joint 100 is installed on the floor slab S of a building can be constructed with a small number of parts and in a shorter construction time at the construction site.
It should be noted that the embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by 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 penetrate the floor slab S of a building, and is particularly advantageous in that it requires a small number of parts and shortens construction time at the construction site.

100 Leg joint 101 Main body 110 Standpipe connection part 112 Upper protrusion 120 Horizontal pipe connection part 122 Lower protrusion 130 Bend part 140 Water film cutting protrusion 150 Sound absorbing material (vibration insulator)
152 Sound insulation material 160 Vibration damping material 170D Hanging support member 170U Lifting support member 180D Hanging support member 180US Downward support member 300 Standpipe socket 310 Connection member 320 Standpipe connection member 1100 Standpipe 1200 Horizontal main pipe

Claims (14)

In drainage facilities for a building having multiple floors, a method for constructing a drainage piping structure includes a resin leg joint for the lowest floor, which connects the downstream end of a standpipe 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 lowest floor, and which has a longer pipe line on the standpipe side than on the horizontal main pipe side,
The leg joint is
a main body including a standpipe connection portion to which a substantially cylindrical connection member having a standpipe connection member at its upper end that is connected to the standpipe above the upper surface of the floor slab, a horizontal pipe connection portion that is connected to the horizontal main pipe, and a curved pipe-shaped bend portion that changes direction so that the pipe axis direction of the standpipe connection portion and the pipe axis direction of the horizontal pipe connection portion are perpendicular to each other, and connects the standpipe connection portion and the horizontal pipe connection portion;
The standpipe connecting member;
the connecting member,
In the leg joint, a lower protrusion is provided on the outer peripheral surface of the horizontal pipe connection part of the main body, in at least a part of the lower half in the circumferential direction, against which a lower support member for supporting the leg joint from below abuts, or a lower protrusion is provided against which a lower support member for suspending the leg joint from a floor slab abuts, and the lower protrusion has a horizontal surface,
The construction method includes:
A manufacturing step in which the main body of the leg joint, the stand pipe connection member, and the connection member are joined and integrated with adhesive joints at a manufacturing site, not at a construction site;
and a construction step of constructing the connection member at a construction site so that the connection member has a portion embedded in the floor slab of the lowest layer,
A construction method characterized in that the construction step includes a step of supporting the leg joint using the lower support member. The construction method described in claim 1, characterized in that at least one of the standpipe connection portion and the standpipe connection member has, in addition to the connection member, a portion that is embedded in the floor slab of the lowest layer. The construction method described in claim 1, characterized in that when the thickness of the floor slab is 100 mm or more, the distance between the upper end surface of the standpipe connecting member and the underside of the floor slab is 150 mm or more. The construction method described in claim 1, characterized in that in the leg joint, the standpipe connection portion and the connection member are connected via a substantially annular standpipe socket below the upper surface of the floor slab. The installation method described in claim 4, characterized in that the standpipe socket is offset by moving the pipe core of the standpipe closer to or farther away from the horizontal pipe connection portion. A leg joint used in the construction method described in claim 1, characterized in that in the leg joint, the standpipe connection portion and the connection member are connected below the upper surface of the floor slab via a substantially annular standpipe receptacle, and the standpipe receptacle has a protrusion at the lower end on the inner periphery of the substantially annular shape. A leg joint used in the construction method described in claim 1, characterized in that the member of the leg joint located above the standpipe connection portion is made of transparent resin. A leg joint used in the construction method described in claim 1, characterized in that the standpipe connection member and the connection member in the leg joint are formed integrally as a connecting member or are formed separately. A leg joint used in the construction method described in claim 1, characterized in that in the leg joint, at least one location on the outer surface of the vertical pipe connection part of the main body, the outer surface of the connection member and the outer surface of the vertical pipe connection member is provided, at least in part of its circumferential direction, with an upper protrusion that is provided to abut against a hanging support member that supports the leg joint by suspending it from the underside of the floor slab, or an upper protrusion that is provided to abut against a lifting support member that lifts and supports the leg joint from the upper surface of the floor slab. A leg joint used in the construction method described in claim 1, characterized in that the leg joint is provided with a lower protrusion on the outer surface of the horizontal pipe connection portion of the main body, in at least a portion of its lower half in the circumferential direction, which is provided to abut against a hanging support member that supports the leg joint by suspending it from the underside of the floor slab, or a lower protrusion on which a lower support member that supports the leg joint by lifting it from below abuts. A drainage piping structure constructed using the construction method described in any one of claims 1 to 5, characterized in that the structure is constructed below the lowest floor slab and the piping is connected only vertically above the lowest floor slab. In the leg joint, at least one of the outer peripheral surface of the standpipe connecting portion of the main body, the outer peripheral surface of the connecting member, and the outer peripheral surface of the standpipe connecting member is provided with an upper protrusion provided in at least a portion of its circumferential direction, against which a hanging support member that supports the leg joint by suspending it from the underside of the floor slab abuts , or an upper protrusion provided in which a lifting support member that supports the leg joint by lifting it from the upper surface of the floor slab abuts,
The drainage piping structure described in claim 11, characterized in that the hanging support member is arranged in contact with the upper protrusion portion so that the leg joint is suspended and supported from the underside of the floor slab, or the lifting support member is arranged in contact with the upper protrusion portion so that the leg joint is lifted and supported from the upper surface of the floor slab. The drainage piping structure described in claim 12, characterized in that the same hanging support member and the same lifting support member are used regardless of whether or not an outer layer member is attached to the leg joint, the type of outer layer member, and the type of standpipe connected to the leg joint. In the leg joint, a lower protrusion is provided on the outer peripheral surface of the horizontal pipe connection part of the main body, in at least a part of the lower half in the circumferential direction, against which a hanging support member that supports the leg joint by suspending it from the underside of the floor slab abuts , or a lower protrusion is provided against which a lower support member that supports the leg joint by lifting it from below abuts,
The drainage piping structure described in claim 11, characterized in that the hanging support member is arranged in contact with the lower protrusion portion so that the leg joint is suspended and supported from the underside of the floor slab, or the lower support member is arranged in contact with the lower protrusion portion so that the leg joint is lifted and supported from below.