Leg joint and drainage piping structure

Abstract

To cut a water film formed by drain falling from a vertical pipe to a leg part joint, by a water film cutting protrusion that is composed of a small number of components and has sufficient strength.SOLUTION: A leg part joint 100 has a body part comprising: a vertical pipe connection part 110 connected to a vertical pipe 1304; a horizontal pipe connection part 120 connected to a horizontal main pipe 1200; and a bend part 130 that changes directions so that a pipe axis direction of the vertical pipe connection part 110 and a pipe axis direction of the horizontal pipe connection part 120 are perpendicular to each other. The main body comprises a water film cutting protrusion 140 formed from one protrusion having a substantially triangular shape in a front view from a pipe core of the vertical pipe connection part 110 to the horizontal pipe connection part 120. The leg part joint 100 further includes a vertical pipe socket 304 provided between the vertical pipe or a collective pipe and the vertical pipe connection part 110. The vertical pipe socket 304 can eccentrically move the pipe core of the vertical pipe 1304 toward or away from the horizontal pipe connection part 120.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] 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 having multiple floors.In particular, the present invention relates to a leg joint and drainage piping structure that is composed of a small number of parts and has a water film cutting protrusion that has sufficient strength to cut the water film formed by drainage water that falls from the vertical pipe or collecting pipe to the leg joint. [Background technology]

[0002] In the drainage system of a multi-storey building such as a high-rise apartment building, the drainage water from each floor is combined and flows down the drainage stand pipe system that is piped through each floor, and is led to the outdoors by the horizontal drainage main pipe that is piped horizontally under the floor slab of the lowest floor. Therefore, in order to connect the lower end of the drainage stand pipe system to the upstream end of the horizontal drainage main pipe, a leg joint that is bent in an arc from the vertical direction to the horizontal direction is used. In such a leg joint, if a water film is formed by the drainage water that falls from the stand pipe to the leg joint (if an air layer cannot be secured in the leg joint when draining from the stand pipe, the leg joint will be filled with the drainage water), the inside of the stand pipe is likely to become negative pressure if the drainage water is discharged from the leg joint at a high speed, and the inside of the stand pipe is likely to become positive pressure if the drainage water is discharged from the leg joint at a low speed, resulting in unexpected negative or positive pressure in the stand pipe. There is a problem that a large negative pressure inside the standpipe can cause the water accumulated in the drain trap to be sucked into the standpipe, or a large positive pressure inside the standpipe can cause the water accumulated in the drain trap to spray out into the room, resulting in a seal failure.

[0003] In order to solve such problems, there is a leg joint disclosed in, for example, JP 2021-162095 A (Patent Document 1) as a leg joint that can secure a space (air layer) that is not filled by drainage within the leg joint. The leg joint disclosed in Patent Document 1 has a first connection part to which a vertical pipe (synonymous with a vertical pipe: the same applies below) is connected, a second connection part to which a horizontal pipe is connected, a curved pipe part that connects the first connection part and the second connection part, and an adapter that is arranged between the first socket of the joint body in which the first connection part is a first socket and the vertical pipe. The adapter has a short, approximately hollow cylindrical shape in the water flow direction (up and down direction) and is provided with a pair of ribs protruding inward from its inner surface, the pair of ribs being arranged at a circumferential distance from each other such that the circumferential distance between the outer sides of the pair of ribs increases or decreases as it extends downward, and the adapter is provided with a water film cutting means (water film cutting portion) formed to protrude relative to the inner surface of the vertical pipe (Claims 1, 7 and Figures 5-7 of Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-162095 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the adapter in the leg joint disclosed in Patent Document 1 includes an adapter body, an elastic ring, and a fixing member, and because the adapter body is provided with a protrusion for cutting the water film, the protrusion is merely a short, approximately hollow cylindrical shape in the water flow direction (vertical direction) separate from the thick leg joint, and may not have sufficient strength, and may be damaged by flowing objects. Furthermore, the adapter in the leg joint disclosed in Patent Document 1 is composed of three members, which means there is a problem that there are many parts and many assembly steps.

[0006] The present invention was developed in consideration of the above-mentioned problems, and its object is to provide a leg joint and drainage piping structure that can cut the water film formed by drainage water falling from a vertical pipe or collecting pipe onto the leg joint using a water film cutting protrusion with a small number of parts and sufficient strength. [Means for solving the problem]

[0007] 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 made of resin including a main body having a stand pipe connection portion to be connected to a stand pipe or a collecting pipe, a horizontal pipe connection portion to be connected to a horizontal main pipe, and a bend portion that changes direction so that the pipe axis direction of the stand pipe connection portion and the horizontal pipe connection portion are perpendicular to each other, and which is characterized in that the main body portion is provided with a water film cutting protrusion for cutting the water film.

[0008] 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 water film cutting projection can be configured to be formed from a single projection. More preferably, the water film-cutting protrusion can be configured to be formed from a single protrusion having an approximately triangular shape when viewed from the pipe core of the vertical pipe connection part toward the horizontal pipe connection part.

[0009] 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 standpipe receiving port can be configured to eccentrically move the pipe core of the standpipe or the collecting pipe closer to the horizontal pipe connection portion when the inner diameter of the standpipe or the collecting pipe is smaller than the inner diameter of the standpipe connection portion. A drainage piping structure according to still another aspect of the present invention is characterized in that any of the leg joints described above is installed under a floor slab.

[0010] Preferably, in the drainage piping structure relating to this aspect, when the inner diameter of the vertical pipe or the collecting pipe is smaller than the inner diameter of the vertical pipe connection portion, the pipe core of the vertical pipe or the collecting pipe can be constructed so as to be eccentrically brought closer to the horizontal pipe connection portion. Effect of the Invention

[0011] According to the present invention, it is possible to provide a leg joint and a drainage piping structure that can cut the water film formed by drainage water falling from a vertical pipe or a collecting pipe onto a leg joint using a water film cutting protrusion that has a small number of parts and sufficient strength. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 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. [Diagram 2] 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). [Diagram 3] FIG. 1 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). [Figure 4] 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. [Diagram 5]This is a two-sided view (top outline view, side 5B cross-sectional view) and a cross-sectional view of the stand pipe receptacle of a drainage piping structure in which a stand pipe is connected to a leg joint without eccentricity using a stand pipe receptacle as a stand pipe connecting member. [Figure 6] 6A is a two-sided view (top outline view, side outline view) of a leg joint including a standpipe socket in the drainage piping structure shown in FIG. 5, and a side 6C cross-sectional view. [Figure 7] 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. [Figure 8] 8A to 8C are two-sided views (top outline view and side outline view) of a leg joint including a standpipe socket in the drainage piping structure shown in FIG. 7 and a side 8C cross-sectional view. [Figure 9] FIG. 2 is a two-sided view (front outline view and side 9B cross-sectional view) of a leg joint not including a vertical pipe socket. [Figure 10] FIG. 13 is a side view of a leg joint having an upper protrusion around its entire circumference. [Figure 11] 13 is a diagram for explaining a water film cutting protrusion. FIG. [Figure 12] 11A and 11B are diagrams for explaining a state in which a water film is cut by a water film cutting protrusion; [Figure 13] FIG. 9 is a diagram for explaining the reason for making the pipe core of the vertical pipe approach the horizontal pipe connection portion and eccentric in FIGS. 7 and 8. [Figure 14] 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. [Figure 15] 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). [Figure 16] This is a diagram in which a cross-sectional view of a lower support member is added to FIG. 15(B). [Figure 17]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. [Figure 18] 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. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] 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, and is constructed so that the thermal expansion material TE is present at the position of the floor slab S (second floor floor slab S2) as shown in Fig. 1. Also, the gap between the through hole of the slab S through which the drainage piping is inserted and the drainage piping is filled with mortar M.

[0014] In the following description, the outer peripheral surface, the outer surface, and the outside, the outer layer side, the outer peripheral side, the inner layer side, the inner peripheral side, and the inside, the thermal expansion material, and the thermally expandable fireproof material may not be clearly distinguished from each other. In addition, in the cross-sectional view, different members may not be clearly distinguished from each other depending on the type of hatching. Furthermore, in the drawings referred to in the following description, in order to easily understand the present invention, a part that should be expressed by its outer shape rather than its inside may be expressed as if the inside is seen through, a part that should be expressed by its cross section rather than its outer shape may be expressed by its outer shape, a part that should be expressed by its outer shape rather than its cross section may be expressed by its cross section, a cross section may not be hatched even if it is a cross section, a cross section may be hatched even if it is not a cross section, a detailed structure may be omitted, or a detailed structure may be omitted or changed, so that the drawings may not match even if the same member is used. In addition, break lines may not be drawn.

[0015] <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.

[0016] <Outline of leg joint 100 and supporting structure> An outline of the structure of a leg joint 100 according to this embodiment and an outline of the support structure will be described with reference to Figs. 1 to 18. 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 connection 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 connection 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 connection 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.

[0017] As shown in these figures, this leg joint 100 is a plastic leg joint that connects the downstream end of a vertical pipe 200 or 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 horizontal pipe connection part 120 are perpendicular to each other, and this main body is supported by being suspended 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.

[0018] A characteristic structure is that the outer peripheral surface of the vertical pipe connection portion 110 in the main body is provided with an upper protrusion portion 112, which is provided in at least a portion of its circumferential direction and abuts against an upper support member 170 (shown in Figure 15, etc.) 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. For this reason, it is preferable in that the leg joint 100 can be suspended from the floor slab by anchor bolts (sleeves) AB and short cut bolts (fully threaded bolts) 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 shorter cut bolts B that suspend and support 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.

[0019] Although details will be described 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 realizing sound insulation (wrapped around the outer circumferential surface of the leg joint 100, etc.), and this upper protrusion 112 (the outermost diameter) protrudes from the outer circumferential surface of the outer layer member (the outermost diameter of the sound absorbing material 150). Also, although not limited thereto, this upper protrusion 112 is present in a portion in 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.

[0020] That is, the upper protrusion 112 has a width W and a height H as 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 at the position 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 as 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.

[0021] 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 the outer layer member is different, or (3) the type of the standpipe or collecting pipe connected to the leg joint is different, the same upper support member 170 can be used because the upper support member 170 is provided 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 a single upper support member 170 is used to support multiple support points) and that the specifications of the upper support member 170 can be made common. 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.

[0022] 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 a 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.

[0023] In addition to this upper protrusion 112, this leg joint 100 is provided with a lower protrusion 122 that is provided on the outer surface of the horizontal pipe connection portion 120 of the main body, and is provided on at least a part of the lower half in the circumferential direction of the outer surface of the horizontal pipe connection portion 120. The lower protrusion 122 abuts against 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.

[0024] 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. The horizontal surface 122L and the horizontal surface 180L (shown in the enlarged view of FIG. 16) of the lower support member 180 (here, an angle bar) come into contact with each other, and the lower support member 180 can stably support the leg joint 100.

[0025] 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 (PET nonwoven fabric) 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 wastewater flow that has flowed down the standpipe 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. In other words, the lower protrusion 122 does not overlap with the vibration-damping material 160 but at least overlaps with the sound-absorbing material 150, and therefore the lower protrusion 122 abuts against the lower support member 180 (here, an angle member) via the sound-absorbing material 150, thereby providing a vibration-damping effect.

[0026] The leg joint 100 also has a water film cutting projection 140 (shown in FIG. 11, etc.) for cutting the water film on its main body. This water film cutting projection 140 is provided at or near the intersection between the pipe wall of the stand pipe connecting portion 110 on the side of the horizontal pipe connecting portion 120 and the pipe wall of the horizontal pipe connecting portion 120 on the side of the stand pipe connecting portion 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), so that even if the drainage water is discharged from the leg joint 100 at high speed, the standpipe is unlikely to become negative pressure, and even if the drainage water is discharged from the leg joint 100 at low speed, the standpipe is unlikely to become positive pressure, and the occurrence of unexpected negative 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.

[0027] The water film cutting projection 140 is formed from one projection, and is formed from one projection 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 an enlarged view of area A(1) in FIG. 11). In this way, the water film cutting projection 140 is provided on the thick main body part of the leg joint 100 and is integrated with the main body part of the leg joint 100 (not a separate member from the main body part of the leg joint). This saves the trouble of preparing the water film cutting projection 140 separately from the main body part of the leg joint 100, and the water film cutting projection 140 is integrated with the thick main body part, so that sufficient strength can be ensured. Furthermore, the water film cutting projection 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 projection 140 through which air can pass. In order to ensure that the flowing water hits the water film cutting projection 140, the leg joint 100 has the following configuration.

[0028] 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 from the horizontal pipe connection part 120 (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 has a nominal diameter of 125A in the standpipe connection part 110, and 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 vertical pipe connected to the leg joint 100 becomes smaller, by simply preparing a different vertical pipe receiving port 300 using the same leg joint 100, the flowing water can be reliably directed at the water film cutting protrusion 140.

[0029] 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 has a protrusion for cutting the water film on the adapter body of the adapter that includes the adapter body, the elastic ring, and the 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 having the water film cutting protrusion 140 on its main body and the standpipe socket 300 prepared according to the diameter of the standpipe. For this reason, the leg joint 100 according to the present embodiment has a small number of parts (in addition to being excellent in strength), and the assembly process can be reduced.

[0030] 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 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 installed eccentrically by bringing it closer to the horizontal pipe connection part. 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.

[0031] <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 described 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.

[0032] 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 eccentric, and Figures 7 and 8 show the standpipe socket 304 used when the standpipe 1304 connected to the leg joint 100 is eccentric. Here, the nominal diameter of the standpipe 1302 is 125A, and the nominal diameter of the standpipe 1304 is 100A.

[0033] In the state without eccentricity shown in Fig. 5 and Fig. 6, the standpipe receptacle 302 and the standpipe receptacle 304 having different structures are used in the state with eccentricity shown in Fig. 7 and Fig. 8. Both the standpipe receptacle 302 and the standpipe receptacle 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 make the pipe core of the standpipe 1304 approach or move away from the horizontal pipe connecting part 120 to make it eccentric by using this space 304S (approaching in Fig. 7). Note that, in the state shown in Fig. 7(A), if the standpipe receptacle 304 is joined to the standpipe connecting part 110 of the leg joint 100 with the left and right reversed, the pipe core of the standpipe 1304 can be made eccentric by moving away from the horizontal pipe connecting part 120.

[0034] 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 white 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 differs 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 collecting pipe connected to the leg joint is different, the upper support member 170 is abutted against the upper protrusion portion 112 and the same (type) upper support member 170 can be used.

[0035] 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 section 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 story 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.

[0036] Next, the water film cutting projection 140 will be described with reference to Fig. 11 to Fig. 13. Fig. 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 Fig. 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, Fig. 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 having 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. 12(A) shows the state of the water film when the water film cutting projection 140 is not present, and FIG. 12(B) shows the state of the water film when the water film cutting projection 140 is present.

[0037] 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 inside of the standpipe will easily become negative pressure, and if the wastewater is discharged from the leg joint at low speed, the inside of the standpipe will easily become positive pressure, resulting in unexpected negative or positive pressure in the standpipe. There is a problem that the water stored in the drain trap will be sucked into the standpipe due to the large negative pressure in the standpipe, or the water stored in the drain trap will be sprayed out into the room due to the large positive pressure in the standpipe, causing a water seal break.

[0038] 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 and splits into two, ensuring an air passage, thereby preventing the occurrence of seal water breakdown. In order to prevent problems such as seal water breakdown, 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 move the pipe core of the standpipe closer to the horizontal pipe connecting part 120 (as shown in Figure 13(A)) and offset. Here, we will explain the reason why, in addition to the effect of ensuring that the flowing water hits the water film cutting projection 140, when the pipe diameter of the standpipe connected to the leg joint 100 becomes small, it is preferable to move the standpipe closer to the horizontal pipe connecting part 120 (as shown in Figure 13(A)) rather than away from it (as shown in Figure 13(B)).

[0039] As shown in Fig. 13(B), when the drain is offset outward, the distance WL until the drain hits the main body (bend portion 130) of the leg joint 100 becomes shorter, and the drain space WS becomes narrower. 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 Fig. 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 the 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.

[0040] Next, referring to FIG. 14 (partly to FIG. 9), the relationship between the upper protrusion 112 and the band portion 172 of the upper support member 170 will be described when the leg joint 100 is provided with outer layer members (vibration-damping material 160, vibration insulator (sound-absorbing material 150), sound-proofing material 152). 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 members (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 collector pipe connected to the standpipe connection portion 110.

[0041] 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 from 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 on 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 to integrate them) of the upper support member 170. In this case, it is preferable that the same (type of) member can be used for this upper support member 170 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 the standpipe or collecting pipe connected to the standpipe connecting part 110. Note that this 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.

[0042] Next, referring to Fig. 16, a 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 (the position where the drainage flow that has flowed down the vertical pipe contacts) of the bend portion 130, 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, but 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 bar can be contacted to this horizontal surface 122L for stable support, as shown in Fig. 16. Furthermore, this lower support member 180 stably supports the bend portion of the main body of the leg joint 100, and is suspended from a 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.

[0043] <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. Note that 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, whereas it is (lifting) support from below (first floor ceiling slab S1) in the support structure shown in Figure 18.

[0044] As shown in Fig. 17, the upper support member 170 attached to the upper projection 112 of the vertical pipe connection part 110 in the main body of the leg joint 100 so that the inner peripheral surface of the band part 172 abuts is supported suspended from the second floor floor slab S2 by inserting a cut bolt B (shorter than the cut bolt B for suspension support by the lower support member 180) into the cut bolt hole and screwing it with a nut N. 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 part 120 in the main body of the leg joint 100, is supported suspended from the second floor floor slab S2 by inserting a cut bolt B (longer than the cut bolt B for suspension support by the upper support member 170) into the cut bolt hole provided in the lower support member 180 and screwing it with a nut N.

[0045] 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 include vibration-proof rubber or the like having vibration-proofing properties.

[0046] 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 whether or not an outer layer member is attached to the leg joint, the type of outer layer member, and the type of vertical pipe or collecting pipe to be connected.

[0047] It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Industrial Applicability]

[0048] The present invention is preferred for a plastic leg joint that connects the downstream end of a vertical pipe or collecting pipe that is piped through the floor slab of a building to the upstream end of a horizontal main pipe that is piped laterally below the floor slab of the lower level, and is particularly preferred in that the water film formed by wastewater that falls from the vertical pipe or collecting pipe onto the leg joint can be cut by a water film cutting protrusion that has a small number of parts and sufficient strength. [Explanation of symbols]

[0049] 100 Leg joint 110 Stack pipe connection 112 Upper protrusion 120 Horizontal pipe connection 122 Lower protrusion 130 Bend section 140 Water film cutting protrusion 150 Sound absorbing material (vibration insulator) 152 Soundproofing material 160 Damping material 170 Upper support member 180 Lower support member 200 Standpipe (extension pipe) 300 Vertical pipe socket 1100 Upper pipe 1200 Horizontal main pipe 1300 Lower pipe

Claims

1. A resin leg joint including a main body including a stand pipe connection portion to be connected to a stand pipe or a collecting pipe, a horizontal pipe connection portion to be connected to a 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, The main body is provided with a water film cutting protrusion for cutting the water film, The water film cutting protrusion is provided at an intersection between a pipe wall of the vertical pipe connection portion on the side of the horizontal pipe connection portion and a pipe wall of the horizontal pipe connection portion on the side of the vertical pipe connection portion or in the vicinity of the intersection, The leg joint is characterized in that the pipe core of the vertical pipe or the collecting pipe is eccentrically moved closer to the horizontal pipe connection section, thereby lengthening the distance until the drainage hits the bend section and expanding the drainage space, thereby making it less likely that the air passage in the vertical pipe or collecting pipe will become blocked and leading to the generation of excessive positive pressure.

2. The upper end of the water film cutting protrusion is located lower than the lower end of the vertical pipe connection part, A leg joint as described in claim 1, characterized in that when the pipe core of the vertical pipe or the collecting pipe is offset by approaching the horizontal pipe connection portion, the drainage space formed below the vertical pipe connection portion starts at a position higher than the water film cutting protrusion.

3. The leg joint according to claim 1 or 2, characterized in that the water film cutting projection is formed from a single projection.

4. A leg joint as described in claim 1 or claim 2, characterized in that the water film cutting protrusion is formed from a single protrusion having an approximately triangular shape when viewed from the pipe core of the vertical pipe connection part toward the horizontal pipe connection part.

5. The leg joint further includes a standpipe socket provided between the standpipe or the collecting pipe and the standpipe connection portion, 3. The leg joint according to claim 1, wherein the standpipe receiving port is offset so that the pipe core of the standpipe or the collecting pipe is brought closer to the horizontal pipe connecting portion.

6. A leg joint as described in claim 5, characterized in that when the inner diameter of the standpipe or the collecting pipe is smaller than the inner diameter of the standpipe connection portion, the standpipe receiving port causes the pipe core of the standpipe or the collecting pipe to be offset toward the horizontal pipe connection portion.

7. A drainage piping structure, characterized in that the leg joint according to claim 1 or 2 is installed under a floor slab.

8. The drainage piping structure according to claim 7, characterized in that when the inner diameter of the vertical pipe or the collecting 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 installed eccentrically and close to the horizontal pipe connection portion.

Images