Drainage piping construction

Abstract

The present invention provides a drainage piping structure that can improve drainage capacity by suppressing the generation of positive pressure inside the pipe. [Solution] A drainage piping structure comprising a lower drainage manifold, an upper drainage manifold, and a bend pipe, wherein the lower drainage manifold and the upper drainage manifold have swirling vanes formed on their inner circumferential surfaces, the lower drainage manifold has an upper pipe protruding above the floor slab and a lower pipe connected below the upper pipe, the upper pipe has an upper pipe connection part to which an upper pipe that allows drainage from the upper floor to flow in is connected, at least one horizontal branch pipe connection part above the floor slab to which a horizontal branch pipe is connected, and an insertion part that is inserted into a through hole formed in the floor slab below the horizontal branch pipe connection part, the lower pipe has a main body part connected to the upper pipe and having swirling vanes, and an extension part that extends below the main body part and has a bend pipe connection part to which a bend pipe is connected at its lower end, the length from the lower end of the swirling vanes to the lower end of the extension part is longer than the vertical length of the bend pipe.

Description

Technical Field

[0001] The present invention relates to a drainage pipe structure used in multi-story buildings.

Background Art

[0002] Conventionally, a drainage pipe structure disclosed in the following Patent Document 1 is known. The drainage pipe structure disclosed in Patent Document 1 includes a lower drainage collecting pipe (collecting joint) provided on the lowest floor of a building, and a bend pipe (leg joint) connected below the lower drainage collecting pipe (see Figure 6 of Patent Document 1). The lower drainage collecting pipe has swirl vanes (inclined plates) for forming a swirling flow.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the drainage pipe structure disclosed in Patent Document 1, the distance from the lower end of the swirl vane to the lower end of the lower drainage collecting pipe (the lower end of the extending portion extending downward from the main body portion where the swirl vane is formed) is shorter than the vertical length of the bend pipe (see Figure 6 of Patent Document 1). Therefore, when viewed in the circumferential direction of the pipe, the deviation of the swirling drainage flow increases, and depending on the orientation of the bend, the deviation of the drainage may block the air passage, generating positive pressure inside the pipe and causing the problem of reduced drainage capacity.

[0005] The present invention has been made in view of the above problems, and an object of the present invention is to provide a drainage pipe structure that can suppress the deviation of the swirling drainage flow generated by the swirl vanes, prevent the air passage from being blocked due to the drainage deviation, suppress the generation of positive pressure inside the pipe, and improve the drainage capacity.

Means for Solving the Problems

[0006] The technical means employed by the present invention to solve the above problems are characterized by the following points.

[0007] The drainage piping structure comprises a lower drainage manifold installed on the lowest floor of the building, an upper drainage manifold installed on a floor above the lowest floor, a bend pipe connected below the lower drainage manifold, and a horizontal main pipe connected to the bend pipe, wherein the lower drainage manifold and the upper drainage manifold have swirling vanes formed on their inner circumferential surfaces, the lower drainage manifold has an upper pipe protruding above the floor slab and a lower pipe connected below the upper pipe, the upper pipe has an upper pipe connection part to which an upper pipe that allows drainage from the upper floor to flow in is connected, at least one horizontal branch pipe connection part above the floor slab to which a horizontal branch pipe is connected, and an insertion part inserted into a through hole formed in the floor slab below the horizontal branch pipe connection part, and the lower pipe is connected to the upper pipe and front The pipe has a main body on which a swirling vane is formed, and an extension that extends downward from the main body and has a bend pipe connection section at its lower end, the extension does not have a reduction mechanism to reduce the flow velocity of the drainage, the length from the lower end of the swirling vane on the lower pipe to the lower end of the extension is longer than the vertical length of the bend pipe, the inner circumferential surface of the lower pipe has a tapered section in which the inner diameter gradually decreases downward, the intersection of the extension lines of the tapered section is located inside the extension section, and in a cross-sectional view of the tapered section and the horizontal main pipe side, at least the extension lines of the tapered section that extend downward and move horizontally from the side of the central axis of the extension section to the side of the horizontal main pipe, are horizontal to the central axis of the extension section inside the extension section. It has reached the main pipe's position.

[0008] Preferably, the intersection is located below the midpoint of the extension in the vertical direction.

[0009] Preferably, the length from the lower end of the swivel blade to the lower end of the extension is longer than the vertical length of the swivel blade.

[0010] Preferably, the length from the lower end of the swivel blade to the lower end of the extension portion is at least twice the vertical length of the swivel blade.

[0011] Preferably, the length from the lower end of the swivel blade to the lower end of the extension portion is longer than the length from the lower end of the swivel blade to the upper end of the insertion portion.

[0012] Preferably, the outer surface of the lower pipe has a tapered portion in which the diameter gradually decreases downward, and the length from the lower end of the swivel blade to the lower end of the extension portion is longer than the vertical length of the tapered portion.

[0013] Preferably, the lower pipe is provided with a flow deflection section that alters the flow of drainage, and the length from the lower end of the swirling vane to the lower end of the extension section is longer than the length of the flow deflection section.

[0014] Preferably, the length from the lower end of the swivel blade to the lower end of the extension portion is at least twice the inner diameter of the main body.

[0015] The second lateral branch pipe connection includes one lateral branch pipe connection and the other lateral branch pipe connection, which are arranged on opposite sides of the central axis of the second upper pipe, and the length from the lower end of the swivel vane of the lower pipe to the lower end of the extension may be longer than the distance between the end of the one lateral branch pipe connection and the end of the other lateral branch pipe connection.

[0016] The length from the lower end of the swivel vane of the lower pipe to the lower end of the extension portion may be longer than the distance from the upper surface of the second floor slab to the upper end of the upper pipe connection portion.

[0017] The inside of the bend pipe is provided with water film cutting projections, which may be located below the extended portion. [Effects of the Invention]

[0018] According to the drainage pipe structure of the present invention, it is possible to suppress the deviation of the swirling flow of wastewater generated by the swirling vanes, prevent the air passage from being blocked by the wastewater deviation, suppress the generation of positive pressure in the pipe, and improve the drainage capacity. [Brief Description of the Drawings]

[0019] [Figure 1] It is a cross-sectional view showing the drainage pipe structure. [Figure 2] It is a plan view (top view) of the upper drainage manifold. [Figure 3] It is an A-A cross-sectional view of Figure 2. [Figure 4] It is a B-B cross-sectional view of Figure 2. [Figure 5] It is a cross-sectional view showing the lower drainage manifold, the bend pipe, and the like. [Figure 6] It is a plan view (top view) of the lower drainage manifold. [Figure 7] It is an A-A cross-sectional view of Figure 6. [Figure 8] It is a B-B cross-sectional view of Figure 6. [Modes for Carrying Out the Invention]

[0020] Hereinafter, preferred embodiments of the drainage pipe structure according to the present invention will be described with reference to the drawings. The drainage pipe structure according to the present invention is used in buildings with multiple floors (especially multi-story buildings), and can be used, for example, in high-rise buildings (as an example, buildings with 15 or more floors).

[0021] Figure 1 is an explanatory view showing one embodiment of the drainage pipe structure 100 according to the present invention. The drainage pipe structure 100 includes a lower drainage manifold 200 provided on the lowest floor of a building, an upper drainage manifold 300 provided on floors above the lowest floor, a bend pipe 400 connected below the lower drainage manifold 200, and a horizontal main pipe 500 connected to the bend pipe 400.

[0022] The pipes that make up the drainage piping structure 100 (lower drainage manifold 200, upper drainage manifold 300, bend pipe 400, and horizontal main pipe 500) are all made of resin.

[0023] The upper drainage manifold 300 is a drainage manifold installed on at least one floor above the lowest floor of the building, and is installed on one or more floors above the lowest floor of the building. Preferably, the upper drainage manifold 300 is installed on a floor that includes at least one floor above the lowest floor of the building.

[0024] As shown in Figure 1, the upper drainage manifold 300 has a first upper pipe 310 that protrudes above the first floor slab S1, which is the floor slab of the upper floor, and a first lower pipe 320 connected below the first upper pipe 310. Figures 2 to 4 show the configuration of the upper drainage manifold 300.

[0025] The first upper pipe 310 is a pipe located above the arrow indicated by reference numeral 310 in Figures 3 and 4. The first lower pipe 320 is a pipe located below the arrow indicated by reference numeral 320 in Figures 3 and 4.

[0026] The first upper pipe 310 includes an upper pipe connection section 311 to which an upper pipe 550 that allows drainage from the upper floor is connected, at least one lateral branch pipe connection section 312 to which a lateral branch pipe 600 is connected above the first floor slab S1, and an insertion section 313 that is inserted into a through hole formed in the first floor slab S1 below the lateral branch pipe connection section 312.

[0027] As shown in Figures 2 to 4, in this embodiment, the lateral branch pipe connection 312 includes lateral branch pipe connection 312A, lateral branch pipe connection 312B, and lateral branch pipe connection 312C. The lateral branch pipe connection 312A, lateral branch pipe connection 312B, and lateral branch pipe connection 312C are arranged in a T-shape in plan view.

[0028] In the following explanation, directions in a plan view (top view) may be expressed as the 12 o'clock direction, 3 o'clock direction, 6 o'clock direction, and 9 o'clock direction, following the positions of the numbers on a clock face. In Figure 2 and Figure 6, which will be explained later, the direction indicated by the symbol 0 is the 12 o'clock direction, the direction indicated by the symbol 3 is the 3 o'clock direction, the direction indicated by the symbol 6 is the 6 o'clock direction, and the direction indicated by the symbol 9 is the 9 o'clock direction. The lateral branch pipe connection part 312A extends in the 6 o'clock direction. The lateral branch pipe connection part 312B extends in the 12 o'clock direction. The lateral branch pipe connection part 312C extends in the 3 o'clock direction.

[0029] The insertion portion 313 of the first upper pipe 310 is located below the lateral branch pipe connection portion 312. The insertion portion 313 extends vertically below the lateral branch pipe connection portion 312. The first lower pipe 320 is connected to the lower part of the insertion portion 313.

[0030] The first lower pipe 320 has an upper pipe connection part 321 that is connected to the insertion part 313 of the first upper pipe 310, and a lower pipe connection part 322 to which the lower pipe 700 that drains wastewater to the lower floor is connected. As a result, the upper end of the first lower pipe 320 is connected to the first upper pipe via the upper pipe connection part 321. It is connected to pipe 310, and its lower end is connected to the lower riser pipe 700 via the lower riser pipe connection part 322. The lower riser pipe 700 is supported below the first floor slab S1 by a support member 750 that extends downward from the first floor slab S1 (see Figure 1).

[0031] As shown in Figures 2 to 4, the upper drainage manifold 300 has a flow deflection section 302 that alters the flow of drainage. The flow deflection section 302 includes a flow deflection plate 303 and a swirling vane 304. The flow deflection plate 303 protrudes from the inner circumferential surface of the first upper pipe 310. The swirling vane 304 protrudes from the inner circumferential surface of the first lower pipe 320. The flow deflection plate 303 has a shape that includes a flat surface and is inclined with respect to the central axis (axis) of the first lower pipe 320. The swirling vane 304 has a shape that includes a curved surface and is inclined with respect to the central axis (axis) of the first lower pipe 320. The swirling vane 304 generates a swirling flow of drainage. However, the shape of the swirling vane 304 is not limited to the shape described above. For example, the swirling vane 304 may have a shape that includes a flat surface. The shape of the flow deflection plate 303 is also not limited to the shape described above. For example, the drift plate 303 may have a curved shape or other shapes.

[0032] The upper end of the flow deflection plate 303 is located below the central axis (the axis of the pipe) of the branch pipe connection 312. Preferably, the upper end of the flow deflection plate 303 is located below the bottom of the branch pipe 600. The lower end of the flow deflection plate 303 is located below the lower end (bottom of the pipe) of the branch pipe connection 312. This prevents wastewater, whose flow direction has been changed by the flow deflection plate 303 and which has been given a swirling component, from flowing back into the branch pipe.

[0033] As shown in Figures 3 and 4, the lower end of the drift plate 303 is located above the upper end of the swirl vane 304. As shown in Figure 2, the drift plate 303 and the swirl vane 304 are not in overlapping positions when viewed from above. As shown in Figure 3, the lower end of the drift plate 303 and the upper end of the swirl vane 304 are not in overlapping positions in the vertical direction. As a result, the wastewater guided by the drift plate 303 is led to the swirl vane 304, where it flows downward as a swirling flow with an increased swirling component.

[0034] The first upper pipe 310 has a backflow prevention rib 314. The backflow prevention rib 314 is formed on the inner circumferential surface of the first upper pipe 310. The backflow prevention rib 314 has a shape parallel to the central axis (axis) of the first upper pipe 310. The backflow prevention rib 314 includes backflow prevention rib 314A, backflow prevention rib 314B, backflow prevention rib 314C, and backflow prevention rib 314D.

[0035] Backflow prevention rib 314A is provided between the lateral branch pipe connection 312B and the lateral branch pipe connection 312C (between the 12 o'clock and 3 o'clock directions). Backflow prevention rib 314B is provided between the lateral branch pipe connection 312C and the lateral branch pipe connection 312A (between the 3 o'clock and 6 o'clock directions). As a result, backflow prevention ribs 314A and 314B can prevent wastewater flowing from the lateral branch pipe into the upper drainage manifold 300 from flowing into the adjacent lateral branch pipe.

[0036] The backflow prevention rib 314C is located between the 6 o'clock and 9 o'clock positions. The lower end of the backflow prevention rib 314C is positioned below the lower end (bottom of the pipe) of the lateral branch pipe connection 312. This prevents backflow from the flow deflection plate 303 to the lateral branch pipe. The lower end of the backflow prevention rib 314C is positioned above the lower end of the flow deflection plate 303. This allows the swirling flow induced by the flow deflection plate 303 to flow down to the swirling vane 304 without being obstructed by the backflow prevention rib 314C.

[0037] The backflow prevention rib 314D is located between the 9 o'clock and 12 o'clock directions. The lower end of the backflow prevention rib 314D is at approximately the same height as the upper end of the flow deflection plate 303. This prevents backflow from the flow deflection plate 303 into the lateral branch pipe and facilitates the formation of a swirling flow.

[0038] In the embodiment described above, the upper drain manifold 300 is equipped with one swirl vane 304, but the upper drain manifold 300 may be equipped with multiple swirl vanes 304. Alternatively, the upper drain manifold 300 may be equipped with a swirl vane 304 but not with a flow deflector 303.

[0039] As shown in Figures 2 to 4, the outer surface of the upper drain manifold 300 is covered by a first outer layer material (first outer layer cover) 800. The first outer layer material 800 has a three-layer structure. The first outer layer material 800 is arranged in the following order from the side closest to the outer surface of the upper drain manifold 300: vibration damping material 801 (or thermally expandable fire-resistant material 802), vibration insulator 803 formed of fire-resistant inorganic fibers, and sound insulation cover 804. However, the configuration of the first outer layer material 800 is not limited to the above configuration and can be changed as appropriate.

[0040] As shown in Figure 5, the lower drainage manifold 200 has a second upper pipe 210 that protrudes above the second floor slab S2, which is the floor slab of the lowest floor, and a second lower pipe 220 connected below the second upper pipe 210. Figures 6 to 8 show the configuration of the lower drainage manifold 200.

[0041] The second upper pipe 210 is a pipe located above the arrow indicated by reference numeral 210 in Figures 7 and 8. The second lower pipe 220 is a pipe located below the arrow indicated by reference numeral 220 in Figures 7 and 8.

[0042] The second upper pipe 210 has an upper pipe connection section 211 to which an upper pipe 450 that allows drainage from the upper floor is connected, at least one lateral branch pipe connection section 212 to which a lateral branch pipe 460 is connected above the second floor slab S2, and an insertion section 213 that is inserted into a through hole formed in the second floor slab S2 below the lateral branch pipe connection section 212.

[0043] If the upper drainage manifold 300 is installed on a floor one level above the lowest floor of the building (the floor where the lower drainage manifold 200 is installed), the upper riser 450 may be the same pipe as the lower riser 700.

[0044] As shown in Figure 6, in this embodiment, the lateral branch pipe connection 212 includes lateral branch pipe connection 212A, lateral branch pipe connection 212B, and lateral branch pipe connection 212C. The lateral branch pipe connection 212A, lateral branch pipe connection 212B, and lateral branch pipe connection 212C are arranged in a T-shape in plan view. The lateral branch pipe connection 212A extends in the 6 o'clock direction. The lateral branch pipe connection 212B extends in the 12 o'clock direction. The lateral branch pipe connection 212C extends in the 3 o'clock direction. The lateral branch pipe connection 212B is located on the opposite side of the lateral branch pipe connection 212A, with the central axis Z1 of the second upper pipe 210 in between.

[0045] The second lower pipe 220 has an upper pipe connection portion 221 that is connected to the insertion portion 213 of the second upper pipe 210, and a bend pipe connection portion 222 to which the bend pipe 400 is connected. As a result, the upper end of the second lower pipe 220 is connected to the second upper pipe 210 by the upper pipe connection portion 221, and the lower end is connected to the bend pipe 400 by the bend pipe connection portion 222.

[0046] The bend pipe 400 is supported below the second floor slab S2 by a support member 760 that extends downward from the second floor slab S2 (see Figure 1). Note that the support member 760 is omitted in Figure 5.

[0047] As shown in Figures 6 to 8, the lower drainage manifold 200 has a flow deflection section 202 that changes the flow of drainage. The flow deflection section 202 includes a flow deflection plate 203 and a swirl vane 204. The flow deflection plate 203 protrudes from the inner circumferential surface of the second upper pipe 210. The swirl vane 204 protrudes from the inner circumferential surface of the second lower pipe 220. The flow deflection plate 203 has a shape in which the surface includes a plane, and the second lower The pipe 220 is inclined with respect to its central axis Z2. The swirling vane 204 has a shape that includes a curved surface and generates a swirling flow of wastewater. However, the shape of the swirling vane 204 is not limited to the shape described above. For example, the swirling vane 204 may have a shape that includes a flat surface. The shape of the flow deflector 203 is also not limited to the shape described above. For example, the flow deflector 203 may have a shape that includes a curved surface or other shapes.

[0048] The upper end of the flow deflector 203 is located below the central axis (pipe axis) Z3 of the branch pipe connection 212. Preferably, the upper end of the flow deflector 203 is located below the bottom of the branch pipe 460. The lower end of the flow deflector 203 is located below the lower end (bottom of the pipe) of the branch pipe connection 212. This prevents wastewater, whose flow direction has been changed by the flow deflector 203 and which has been given a swirling component, from flowing back into the branch pipe.

[0049] Furthermore, the lower end of the drift plate 203 is located above the upper end of the swirl vane 204. Also, as shown in Figure 6, the drift plate 203 and the swirl vane 204 are not in overlapping positions when viewed from above. As shown in Figure 7, the lower end of the drift plate 203 and the upper end of the swirl vane 204 are not in overlapping positions in the vertical direction. As a result, the wastewater guided by the drift plate 203 is led to the swirl vane 204, and flows downward as a swirling flow with an increased swirling component due to the swirl vane 204.

[0050] The second upper pipe 210 has a backflow prevention rib 214. The backflow prevention rib 214 is formed on the inner circumferential surface of the second upper pipe 210. The backflow prevention rib 214 has a shape parallel to the central axis Z1 of the second upper pipe 210. The backflow prevention rib 214 includes backflow prevention rib 214A, backflow prevention rib 214B, backflow prevention rib 214C, and backflow prevention rib 214D.

[0051] Backflow prevention rib 214A is provided between the lateral branch pipe connection 212B and the lateral branch pipe connection 212C (between the 12 o'clock and 3 o'clock directions). Backflow prevention rib 214B is provided between the lateral branch pipe connection 212C and the lateral branch pipe connection 212A (between the 3 o'clock and 6 o'clock directions). As a result, backflow prevention ribs 214A and 214B can prevent wastewater flowing from the lateral branch pipe into the lower drainage manifold 200 from flowing into the adjacent lateral branch pipe.

[0052] The backflow prevention rib 214C is located between the 6 o'clock and 9 o'clock positions. The lower end of the backflow prevention rib 214C is positioned below the lower end (bottom of the pipe) of the lateral branch pipe connection 212. This prevents backflow from the flow deflection plate 203 to the lateral branch pipe. The lower end of the backflow prevention rib 214C is positioned above the lower end of the flow deflection plate 203. This allows the swirling flow induced by the flow deflection plate 203 to flow down to the swirling vane 204 without being obstructed by the backflow prevention rib 214C.

[0053] The backflow prevention rib 214D is located between the 9 o'clock and 12 o'clock directions. The lower end of the backflow prevention rib 214D is at approximately the same height as the upper end of the flow deflection plate 203. This prevents backflow from the flow deflection plate 203 into the lateral branch pipe and facilitates the generation of swirling flow.

[0054] In the embodiment described above, the lower drain manifold 200 is equipped with one swirl vane 204, but the lower drain manifold 200 may be equipped with multiple swirl vanes 204. Alternatively, the lower drain manifold 200 may be equipped with a swirl vane 204 but not with a flow deflector 203.

[0055] When the portion below the swirl vane 204 (part L1) is short and the swirling flow does not lose momentum, or when the bend pipe 400 has a compact bend, or when the bend pipe 400 has a water film cutting projection (either one of these cases, or a combination of two, or a combination of three) In this configuration, a problem is likely to occur where the positive pressure inside the pipe increases because there is no escape route for air within the bend pipe 400. However, by incorporating the characteristic configuration described later, it is possible to prevent this problem from occurring.

[0056] As shown in Figures 7 and 8, the second lower pipe 220 has a main body 223 connected to the second upper pipe 210 and an extension 224 connected below the main body 223. The upper end of the main body 223 is the upper end of the second lower pipe 220. The lower end of the extension 224 is the lower end of the second lower pipe 220. The main body 223 is connected to the upper end of the extension 224. A bend pipe connection part 222 is provided at the lower end of the extension 224. As a result, the bend pipe 400 is connected to the lower end of the extension 224.

[0057] In this embodiment, the main body 223 and the extension 224 are composed of separate pipes. The pipe constituting the extension 224 (extension pipe 224) is supported below the second floor slab S2 by a support member 770 that extends downward from the second floor slab S2 (see Figure 1). Note that the support member 770 is omitted in Figure 5.

[0058] As shown in Figures 7 and 8, a cylindrical body 250 is interposed between the main body 223 and the extension 224, which are made up of separate tubes. The cylindrical body 250 is interposed between the outer circumferential surface of the lower part of the extension 224 and the inner circumferential surface of the upper part of the extension 224. The cylindrical plate 250 is a rubber ring, and the main body 223 and the extension 224 are joined together with this rubber ring.

[0059] However, the main body 223 and the extension 224 may be a single unit (a tube made of one molded part). In this case, the cylindrical body 250 is unnecessary. In this case, the extension 224 extends straight downward from the lower end of the main body 223. Also, the main body 223 and the extension 224 may be connected using a socket or the like, instead of a rubber ring joint (via the cylindrical body 250).

[0060] As shown in Figures 7 and 8, the inner circumferential surface of the second lower pipe 220 has a tapered section 225 in which the inner diameter gradually decreases downwards. Above the tapered section 225, the second lower pipe 220 has a first straight section 226 having the same inner diameter as the upper end of the tapered section 225. Below the tapered section 225, the second lower pipe 220 has a second straight section 227 having the same inner diameter as the lower end of the tapered section 225. The inner diameter of the second straight section 227 is smaller than the inner diameter of the first straight section 226. The upper part of the first straight section 226 is connected to the upper pipe connection section 221. The lower part of the second straight section 227 is connected to the extension section 224. The inner diameter of the second straight section 227 is smaller than the inner diameter of the upper pipe connection section 221.

[0061] As described above, a swivel vane 204 is formed on the inner circumferential surface of the second lower pipe 220. The swivel vane 204 is formed on the inner circumferential surface of the main body 223. The swivel vane 204 is formed in the vertical direction, spanning from the first straight pipe section 226 to the tapered section 225. The upper end of the swivel vane 204 is at the same or approximately the same height as the upper end of the first straight pipe section 226. The lower end of the swivel vane 204 is at the same or approximately the same height as the lower end of the tapered section 225.

[0062] The second lower pipe 220 has a third straight pipe section 228 below the main body section 223. The third straight pipe section 228 is provided in the extension section 224. The inner diameter of the third straight pipe section 228 is the same as or approximately the same as the inner diameter of the second straight pipe section 227. When the main body section 223 and the extension section 224 are a single unit, the second straight pipe section 227 and the third straight pipe section 228 are formed in a continuous straight shape.

[0063] The upper part of the extension section 224 is provided with a connecting section 224a that connects to the lower part of the main body section 223. The inner diameter of the connecting section 224a is larger than the inner diameter of the third straight pipe section 228. The connecting section 224a is fitted to the outer surface of the cylindrical body 250. If the main body section 223 and the extension section 224 are a single unit, the connecting section 224a is not necessary.

[0064] As shown in Figures 7 and 8, the outer surface of the lower drainage manifold 200 is covered by a second outer layer material (second outer layer cover) 900. The second outer layer material 900 has a three-layer structure. The second outer layer material 900 is arranged in the following order from the side closest to the outer surface of the lower drainage manifold 200: vibration damping material 901 (or thermally expandable fire-resistant material 902), vibration insulator 903 formed of fire-resistant inorganic fibers, and sound insulation cover 904. However, the configuration of the second outer layer material 900 is not limited to the above configuration and can be changed as appropriate.

[0065] As shown in Figures 1 and 5, the bend pipe 400 is located below the second floor slab S2. Below the second floor slab S2, the bend pipe 400 is connected to the bend pipe connection portion 222 of the lower drainage manifold 200.

[0066] The bend pipe 400 is a pipe that is curved 90 degrees in an arc shape. The bend pipe 400 has a first connection part 401 that is connected to the lower end of the lower drainage manifold pipe 200 and a second connection part 402 to which the horizontal main pipe 500 is connected. The first connection part 401 is open upward. The second connection part 402 is open horizontally (lateral). The horizontal main pipe 500 is located below the second floor slab S2 and one end is connected to the second connection part 402.

[0067] As shown in Figure 5, a water film cutting projection 410 is provided inside the bend pipe 400. The water film cutting projection 410 is located below the lower drain manifold pipe 200 (below the extension portion 224). The water film cutting projection 410 is positioned near the lower end of the lower drain manifold pipe 200 (the lower end of the extension portion 224). The water film cutting projection 410 protrudes from below the outer circumferential surface of the extension portion 224 toward the central axis Z4 of the extension portion 224 (inward). The tip (inward end) of the water film cutting projection 410 does not extend to a position that reaches the central axis Z4.

[0068] By providing such water film-cutting protrusions 410, the water film of wastewater flowing down along the inner surface of the lower drainage manifold 200 and entering the bend pipe 400 can be cut. This improves the drainage capacity of the drainage piping structure 100.

[0069] The following describes the characteristic configuration of the drainage piping structure 100 according to the present invention. However, the drainage piping structure 100 does not need to have all of the configurations described below, and it is sufficient to have at least one of them. Furthermore, the drainage piping structure 100 may have configurations different from those described below.

[0070] As shown in Figure 5, the first length L1, which is the length from the lower end of the swivel vane 204 of the lower drain manifold 200 to the lower end of the extension 224, is longer than the vertical length L2 of the bend pipe 400 (L1 > L2). In this embodiment, the first length L1 is shorter than twice the length L2 (L2 <L1<2×L2)。

[0071] To improve the piping arrangement below the second floor slab S2, it is necessary to shorten the vertical length L2 of the bend pipe 400 (make the bend pipe 400 more compact). However, making the bend pipe 400 more compact makes it easier for positive pressure to be generated inside the pipe, reducing its drainage capacity. However, by increasing the first length L1 (making L1 > L2), the generation of positive pressure inside the pipe can be suppressed, and the drainage capacity can be improved.

[0072] Furthermore, when combining a drain manifold that generates a strong swirling flow using swirling vanes 204 with a compact bend pipe 400 equipped with water film-cutting protrusions 410 inside, ensuring a longer distance from the swirling vanes 204 to the bend pipe 400 (longer than the length L2 of the bend pipe 400) suppresses uneven drainage of the swirling flow generated by the swirling vanes 204, prevents the air passage from being blocked by uneven drainage, suppresses the generation of positive pressure inside the pipe, and improves drainage capacity. It can be raised.

[0073] If the distance from the swirl vane 204 to the bend pipe 400 is short, the unevenness of the drainage flow in the swirling direction becomes large when viewed in the circumferential direction of the pipe, and depending on the direction of the bend, this uneven drainage can block the air passage. However, by ensuring a longer distance from the swirl vane 204 to the bend pipe 400 (let L1 > L2), the unevenness of the drainage can be mitigated, and the air passage can be secured, thereby suppressing the generation of positive pressure inside the pipe.

[0074] The length to the lower end of the extension 224 described above can be rephrased as the length to the lower end of the second lower pipe 220. The lower part of the swivel blade 204 is not shown in Figure 5, so it is represented by a dashed line in Figure 5. The lower part of the swivel blade 204 is shown in Figure 8.

[0075] As shown in Figure 5, the intersection point CP1 of the extension line EL1 of the tapered section 225 is located inside the extension section 224 (inside the second lower pipe 220).

[0076] Above intersection CP1, the swirling flow of the drainage is more uneven. If intersection CP1 is located inside the bend pipe 400, the uneven flow of the drainage will reach the bend pipe 400, and depending on the direction of the bend, the uneven flow of the drainage may block the air passage, reducing the drainage capacity. However, by having intersection CP1 located inside the extension section 224, the blockage of the air passage due to the uneven flow of the drainage is prevented, and the reduction in drainage capacity can be suppressed.

[0077] The extension line EL1 of the tapered portion 225 is a line that extends downward from the tapered portion 225, along the inclined surface of the tapered portion 225. The intersection CP1 of the extension lines EL1 is the point where multiple extension lines EL1 (multiple extension lines EL1 located at different positions in the circumferential direction) that are inclined along the inclined surface of the tapered portion 225 intersect below the tapered portion 225.

[0078] As shown in Figure 5, the intersection point CP1 of the extension line EL1 of the tapered section 225 is located below the vertical midpoint of the extension section 224 (the vertical midpoint of the pipe (extension pipe 224) that constitutes the extension section 224). This allows for the mitigation of drainage bias below the intersection point CP1 and ensures an air passage, thereby enabling smooth drainage to be guided to the bend pipe 400.

[0079] However, intersection CP1 only needs to be located inside the extension section 224 (inside the second lower pipe 220), and may be located at the midpoint of the extension section 224 in the vertical direction, or it may be located above the midpoint of the extension section 224 in the vertical direction.

[0080] As shown in Figure 5, the first length L1 is longer than the vertical length L3 of the swirl vane 204 (L1 > L3). This ensures that the first length L1 is long regardless of the size of the vertical length L3 of the swirl vane 204 (even if length L3 is long). Therefore, it is possible to suppress uneven drainage of the swirling flow generated by the swirl vane 204, prevent the air passage from being blocked by uneven drainage, suppress the generation of positive pressure inside the pipe, and improve drainage capacity.

[0081] Furthermore, the first length L1 is at least twice the vertical length L3 of the swirling blade 204 (L1 > 2 × L3). This makes it possible to more reliably suppress the uneven drainage of the swirling flow generated by the swirling blade 204, thereby improving the drainage capacity.

[0082] As shown in Figure 5, the first length L1 is longer than the length L4 from the lower end of the swivel vane 204 to the upper end of the insertion section 213 (L1 > L4). As a result, the large volume of wastewater, which is the combined wastewater flowing down from the upper floor and the wastewater flowing from the lateral branch pipe, flows through the section of length L4, and then its diameter is reduced to the first length Even if the water flows into section L1, the long first length L1 suppresses uneven drainage of the swirling flow generated by the swirling vane 204, thus allowing the drainage to be smoothly guided to the bend pipe 400. In this embodiment, the first length L1 is shorter than twice the length L4 (L4 <L1<2×L4)。

[0083] As shown in Figure 5, the first length L1 is longer than the vertical length L5 of the tapered section 225 (L1 > L5). This causes the tapered section 225 to collect the wastewater towards the center of the pipe, blocking the air passage through the pipe core. However, by making the first length L1 longer than length L5, the wastewater is allowed to flow along the pipe again, ensuring an air passage through the pipe core and thus suppressing the pressure inside the pipe. In this embodiment, the first length L1 is more than three times the vertical length L5 of the tapered section 225 (L1 > 3 × L5).

[0084] As shown in Figure 5, the first length L1 is longer than the vertical length L3 + L6 of the flow deflection section 202 (flow deflection plate 203, swirling blade 204) (L1 > L3 + L6). This makes it possible to ensure that the length of the first length L1 is long (longer than the total length of the flow deflection section) regardless of the length of the flow deflection section 202. As a result, the unevenness of the drainage of the swirling flow generated by the swirling blade 204 is suppressed, which suppresses the generation of positive pressure in the pipe and allows for high drainage capacity.

[0085] As shown in Figure 5, the first length L1 is at least twice the inner diameter D1 of the main body 223 (the inner diameter of the second straight pipe section 227) (L1 ≥ 2 × D1). This makes it possible to ensure that the length of the first length L1 is long (at least twice D1) relative to the inner diameter D1 of the main body 223, regardless of the size of the inner diameter D1. Therefore, if the inner diameter D1 of the main body 223 is small, it becomes difficult to suppress the uneven drainage of the swirling flow generated by the swirling vanes 204. However, by ensuring a long first length L1, the uneven drainage of the swirling flow is suppressed, thus suppressing the generation of positive pressure inside the pipe and enabling high drainage capacity.

[0086] The first length L1 may be three times or more (L1 ≥ 3 × D1) or four times or more (L1 ≥ 4 × D1) the inner diameter D1 of the main body 223.

[0087] As shown in Figure 5, in a cross-sectional view of the tapered portion 225 and the horizontal main pipe 500 side, at least the extension line EL1 of the tapered portion 225 reaches a position on the horizontal main pipe 500 side of the central axis Z4 of the extension portion 224. In other words, the extension line EL1 of the tapered portion 225 reaches a position on the horizontal main pipe 500 side of the central axis Z4 of the extension portion 224 inside the bend pipe 400 or the horizontal main pipe 500. If the extension portion 224 is short, the extension line EL1 will not reach a position on the horizontal main pipe 500 side of the central axis Z4 of the extension portion 224, but will protrude downward from the extension portion 224.

[0088] To put it in more detail, if the extension line EL1 of the tapered section 225 is extended so that as it extends downward, it moves horizontally from the side opposite to the horizontal main pipe 500 side of the central axis Z4 of the extension section 224 (left side in Figure 5) to the side of the horizontal main pipe 500 (right side in Figure 5), then the extension line EL1 reaches a position inside the bend pipe 400 or the horizontal main pipe 500 that is on the horizontal main pipe 500 side of the central axis Z4 (point P1 in Figure 5 is located to the right of the central axis Z4). As a result, the wastewater that has flowed down along the tapered section 225 flows more easily from the bend pipe 400 towards the horizontal main pipe 500, thereby improving the drainage performance of the drainage piping structure 100.

[0089] Although not shown in the diagram, in a cross-sectional view of the tapered portion 225 and the horizontal main pipe 500, at least the extension line EL1 of the tapered portion 225 may reach the inner surface of the horizontal main pipe 500. In simpler terms, the extension line EL1 of the tapered portion 225 may reach the inner surface of the horizontal main pipe 500. In more detail, if the extension line EL1 of the tapered portion 225 is extended so that as it extends downwards, it transitions horizontally from the side opposite to the horizontal main pipe 500 side of the central axis Z4 of the extension portion 224 (left side in Figure 5) to the side of the horizontal main pipe 500 (right side in Figure 5), then the extension line EL1 reaches the inner surface of the horizontal main pipe 500. It may reach (point P1 in Figure 5 may reach the inner surface of the horizontal main pipe 500). In this way, the wastewater flowing down along the tapered section 225 is more easily guided into the horizontal main pipe 500, thereby improving the drainage performance of the drainage piping structure 100.

[0090] In addition to the characteristic configuration described above, the drainage piping structure 100 according to the present invention may also include the following configurations. The drainage piping structure 100 is not necessarily required to have the configurations described below, but it is preferable to have at least one of them.

[0091] As shown in Figure 5, the first length L1 is longer than the distance L7 between the end of the lateral branch pipe connection 212A and the end of the lateral branch pipe connection 212B (L1 > L7).

[0092] As shown in Figure 5, the first length L1 is longer than the distance L8 from the top surface of the second floor slab S2 to the top end of the upper pipe connection 211 (L1 > L8).

[0093] While embodiments of the present invention have been described above, the embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims rather than by the foregoing description, and all modifications within the meaning and scope of equivalence to the claims are intended to be included. [Explanation of Symbols]

[0094] 100 Drainage piping structure 200 Lower drainage collecting pipe 202 Straight flow section 203 Straight flow plate (straight flow section) 204 Swivel vane (flow deflection section) 210 2nd upper pipe (upper pipe) 211 Upper pipe connection 212 Horizontal branch pipe connection 212A First horizontal branch pipe connection 212B Second lateral branch pipe connection 213 Insertion section 220 Second lower pipe (lower pipe) 223 Main body 224 Extension section 225 Tapered section 300 Upper drainage collecting pipe 304 Swivel blades 400 Bend Pipe 500 horizontal main pipe 600 Lateral branch pipe CP1 Intersection of the extension line of the tapered section D1 Inner diameter of the main body EL1 extension line of the tapered section L1 Length from the lower end of the swivel vane to the lower end of the extension of the lower drainage manifold L2 Length of the bend pipe in the vertical direction L3 Vertical length of the swivel blade L4 Length from the lower end of the swivel blade to the upper end of the insertion part L5 Length of the tapered section in the vertical direction L3+L6 Vertical length of the flow deviation section S2 Second floor slab (floor slab) Z4 Extension section central axis

Claims

1. A drainage piping structure comprising a lower drainage manifold installed on the lowest floor of a building, an upper drainage manifold installed on a floor above the lowest floor, a bend pipe connected below the lower drainage manifold, and a horizontal main pipe connected to the bend pipe, The lower drain manifold and the upper drain manifold have swirling vanes formed on their inner circumferential surfaces. The lower drainage manifold has an upper pipe that protrudes above the floor slab and a lower pipe connected below the upper pipe. The upper pipe has an upper pipe connection section to which an upper pipe that allows drainage from the upper floor is connected, at least one lateral branch pipe connection section above the floor slab to which a lateral branch pipe is connected, and an insertion section below the lateral branch pipe connection section that is inserted into a through hole formed in the floor slab. The lower pipe has a main body portion connected to the upper pipe and having the swivel vanes formed thereon, and an extended portion that extends downward from the main body portion and has a bend pipe connection portion at its lower end to which the bend pipe is connected. The extension section does not have a deceleration mechanism to reduce the flow velocity of the drainage. The length from the lower end of the swivel vane of the lower pipe to the lower end of the extension is longer than the vertical length of the bend pipe. The inner circumferential surface of the lower pipe has a tapered section in which the inner diameter gradually decreases towards the bottom. The tapered portion is such that the intersection of the extension lines of the tapered portion is located inside the extended portion. In a cross-sectional view of the tapered portion and the horizontal main pipe side, at least the extension of the tapered portion that extends downward and transitions horizontally from the side of the central axis of the extension portion toward the horizontal main pipe side reaches a position within the extension portion toward the horizontal main pipe side than the central axis of the extension portion, in a drainage piping structure.

2. The drainage piping structure according to claim 1, wherein the intersection is located below the midpoint in the vertical direction of the extension.

3. The drainage piping structure according to claim 1, wherein the length from the lower end of the swivel vane of the lower pipe to the lower end of the extension portion is longer than the vertical length of the swivel vane of the lower pipe.

4. The drainage piping structure according to claim 1, wherein the length from the lower end of the swivel vane of the lower pipe to the lower end of the extension portion is at least twice the vertical length of the swivel vane of the lower pipe.

5. The drainage piping structure according to claim 1, wherein the length from the lower end of the swivel vane of the lower pipe to the lower end of the extension portion is longer than the length from the lower end of the swivel vane of the lower pipe to the upper end of the insertion portion.

6. The outer surface of the lower pipe has a tapered section in which the diameter gradually decreases downwards. The drainage piping structure according to claim 1, wherein the length from the lower end of the swivel vane of the lower pipe to the lower end of the extension portion is longer than the vertical length of the tapered portion.

7. Equipped with a section that alters the flow of wastewater, The aforementioned flow deflection section includes the swirling vanes of the lower pipe and the flow deflection plate provided on the upper pipe. The drainage piping structure according to claim 1, wherein the length from the lower end of the swivel vane of the lower pipe to the lower end of the extension is longer than the length of the flow deflection section, which is the sum of the vertical length of the swivel vane of the lower pipe and the vertical length of the flow deflection plate.

8. The drainage piping structure according to claim 1, wherein the length from the lower end of the swivel vane of the lower pipe to the lower end of the extension portion is at least twice the inner diameter of the main body.

9. The second lateral branch pipe connection includes one lateral branch pipe connection and the other lateral branch pipe connection, which are arranged on opposite sides of the central axis of the second upper pipe. The drainage piping structure according to claim 1, wherein the length from the lower end of the swivel vane of the lower pipe to the lower end of the extension is longer than the distance between the end of one lateral branch pipe connection and the end of the other lateral branch pipe connection.

10. The drainage piping structure according to claim 1, wherein the length from the lower end of the swivel vane of the lower pipe to the lower end of the extension portion is longer than the distance from the upper surface of the second floor slab to the upper end of the upper riser connection portion.

11. The inside of the aforementioned bend pipe is provided with water film cutting protrusions, The drainage piping structure according to claim 1, wherein the water film cutting projection is provided below the extended portion.

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