Drainage collecting pipe

Abstract

To provide a drainage collecting pipe wherein the influence leading to a decrease in drainage capacity due to the absence of an inner surface below a swirl vane is small.SOLUTION: A drainage collecting pipe 1000 comprises a standard upper pipe 1100 and a standard lower pipe 1500, wherein the standard upper pipe 1100 includes an upper vertical pipe connection part 1110 for connecting an upper vertical pipe and at least one horizontal branch pipe connection part 1120 for connecting a horizontal branch pipe, and the standard lower pipe 1500 includes a diameter reduction part DR and a swirl vane 1600 provided so that a part thereof overlaps with the diameter reduction part DR in a height direction. Although an outer edge of the swirl vane 1600 has a shape that is not straight but convex toward an inner peripheral side, the standard lower pipe 1500 where the swirl vane 1600 is located does not have a recess on an outer peripheral surface thereof, and a thickness of the swirl vane 1600 in a cross section perpendicular to a tube axis is thicker in a lower part (a lower portion 1620 of the swirl vane 1600) than in an upper part (an upper portion 1610 of the swirl vane 1600).SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a resin drainage manifold disposed in a through-hole of a floor slab of a building, including an upper pipe protruding above the floor slab and a lower pipe connected below the upper pipe. In the drainage manifold where the lower pipe has a reduced diameter portion and a swivel vane in the reduced diameter portion, in particular, since there is no inner surface below the swivel vane, the influence leading to a decrease in drainage capacity is small, and there is no recess on the outer peripheral surface of the lower pipe (so that, for example, an outer layer member (outer layer cover) can be easily attached). The present invention also relates to a drainage manifold capable of reducing damage to the swivel vane when performing maintenance on the drainage manifold from below the lower pipe.

Background Art

[0002] Water supply facilities and drainage facilities are provided in apartment buildings, office buildings, etc. Among these, the drainage facility typically has a drainage pipe structure including a vertical pipe (riser pipe, upper riser pipe, lower riser pipe) penetrating vertically through each floor of the building, a horizontal pipe (horizontal branch pipe, branch pipe) installed within each floor, and a drainage pipe joint (also referred to as a drainage manifold, drainage pipe joint, drainage collection joint) connecting these.

[0003] And such a drainage pipe joint is provided by penetrating the floor slab of the building when constructed in the building, and includes an upper pipe having an upper riser connection portion connecting an upper riser protruding above the floor slab and allowing drainage to flow in from the upper floor, and at least one horizontal branch pipe connection portion connecting a horizontal branch pipe above the floor slab, and a lower pipe connected below the upper pipe and having a lower riser connection portion connecting a lower riser allowing drainage to flow into the lower floor. In such a drainage pipe joint, many have a portion (for example, protrusions on the inner peripheral surface such as swivel vanes, straightening vanes, vane members, deflector plates) for changing the flow of drainage within the drainage pipe joint to improve drainage performance. As an example, although it is an example, the swivel vane is often provided in the reduced diameter portion (inclined pipe portion) of the lower pipe (except for the lowest floor). Also, as such a drainage pipe joint, those formed of one or more resin injection molded products are widely known.

[0004] Japanese Patent Publication No. 7136980 (Patent Document 1) discloses an assembly joint that solves the following problems when forming a drainage pipe joint made of cast iron by casting and provided with a swivel vane in an inclined pipe section by injection molding with resin or the like. This problem is that when trying to form the space below the swivel vane in the inclined pipe section using a core, the core cannot be moved upward because it is locked by the swivel vane. On the other hand, since the inclined pipe section tapers downward, the core cannot be moved downward either, and it is difficult to remove the core from the assembly joint after forming the assembly joint with a swivel vane in the inclined pipe section by injection molding.

[0005] The assembly joint disclosed in this Patent Document 1 includes an upper connecting pipe having a lateral pipe connection portion on its outer peripheral surface, and a lower connecting pipe formed in a tubular shape and arranged such that its axis is along the vertical direction. The lower connecting pipe has a socket into which the lower end of the upper connecting pipe or the lower end of an intermediate pipe connected to the lower end of the upper connecting pipe is inserted, a swivel vane provided integrally with the inner surface of the lower connecting pipe by injection molding, and an inclined pipe section that gradually tapers from above downward. The socket is formed in a cylindrical shape coaxial with the axis. The swivel vane gradually extends toward the first side in the circumferential direction from above downward, has an upper surface facing the first side, a lower surface facing the second side in the circumferential direction, upper and lower ends protruding from the inner surface of the lower connecting pipe into the interior of the lower connecting pipe, and upper and lower ends of the swivel vane connected thereto, and a side portion facing the axis. The upper end of the swivel vane is provided below the socket, and at least a part of it is provided on the inner peripheral surface of the inclined pipe section. The inner peripheral surface of the inclined pipe section gradually inclines toward the axis from above downward, and has a first inner surface, a second inner surface arranged below the lower surface of the swivel vane, and a third inner surface extending radially outward from the end on the second side of the second inner surface and facing the second side. Among the outer peripheral surfaces of the inclined pipe section, the outer peripheral surface corresponding to the second inner surface is recessed, and the third inner surface is parallel to the axis or inclined toward the second side as it goes downward. characterized in that.

[0006] According to this collective joint, the first inner surface of the inclined pipe portion is inclined so as to gradually separate from the axis as it goes from bottom to top. Therefore, the first inner surface can be formed using, for example, the first core of a mold. After the collective joint is formed by injection molding, the first core can be moved upward with respect to the collective joint to remove the first core from the collective joint. Further, the second inner surface of the inclined pipe portion is disposed below the turning blade and is inclined so as to gradually separate from the axis as it goes downward. Therefore, the second inner surface can be formed using, for example, the second core of a mold. After the collective joint is formed by injection molding, the second core can be moved downward with respect to the collective joint to remove the second core from the collective joint. In this way, the second inner surface, which is a part of the inner peripheral surface of the inclined pipe portion and is disposed below the turning blade, can be formed using the second core.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] However, in the collective joint disclosed in Patent Document 1, since there are a second inner surface and a third inner surface extending radially from the end of the second inner surface below the turning blade of the lower connecting pipe, a sufficient air passage cannot be ensured, and the pipe internal pressure may increase, resulting in a possible decrease in drainage capacity. More specifically, although air tries to flow downward along the inclined pipe portion, the presence of the third inner surface forms a wall, narrowing the air passage toward the lower part of the turning blade and preventing a sufficient air passage from being ensured. In addition, in the collective joint disclosed in this Patent Document 1, the inner peripheral surface and the outer peripheral surface of the portion corresponding to the second inner surface in the inclined pipe portion are recessed toward the axis O, so-called meat theft occurs in the portion corresponding to the second inner surface of the inclined pipe portion, and a recess is formed on the outer peripheral surface of the inclined pipe portion that is recessed toward the axis.

[0009] The present invention has been developed in view of the above problems, and an object thereof is to provide a resin drainage collecting pipe disposed in a through-hole of a floor slab of a building, the drainage collecting pipe including an upper pipe protruding above the floor slab and a lower pipe connected below the upper pipe. In the drainage collecting pipe in which the lower pipe has a reduced diameter portion and a turning vane provided at the reduced diameter portion, since there is no inner surface below the turning vane, the influence leading to a decrease in drainage capacity is small, and there is no recess on the outer peripheral surface of the lower pipe (so that, for example, an outer layer member (outer layer cover) can be easily attached). Another object is to provide a drainage collecting pipe capable of reducing breakage of the turning vane when performing maintenance on the drainage collecting pipe from below the lower pipe. Another object of the present invention is to provide a drainage collecting pipe capable of increasing the strength of a portion where the turning vane is installed (the base portion of the turning vane) to suppress vibration and / or noise. Another object of the present invention is to provide a drainage collecting pipe capable of omitting (or thinning) a part of an outer layer member having vibration damping performance and / or sound insulation performance attached to the outer peripheral surface of the lower pipe.

Means for Solving the Problems

[0010] To achieve the above object, the drainage collecting pipe according to the present invention takes the following technical means.

[0011] The drainage collecting pipe according to the present invention is a resin drainage collecting pipe disposed in a through-hole of a floor slab of a building. The drainage collecting pipe includes an upper pipe protruding above the floor slab and a lower pipe connected below the upper pipe. The lower pipe has a reduced diameter portion and a turning vane provided at the reduced diameter portion. When the turning vane is viewed from above along the pipe axis of the lower pipe, the outer edge of the turning vane has a shape convex toward the inner peripheral side, and the outer peripheral surface of the lower pipe where the turning vane is located has no recess.

[0012] ​Preferably, when the turning vane is viewed from above along the axis of the lower pipe, a step may not exist between a portion hidden by the turning vane and a non-hidden portion on the inner surface of the lower pipe.

[0013] More preferably, the thickness of the turning vane in a cross-section perpendicular to the pipe axis can be configured such that the lower part is thicker than the upper part.

[0014] More preferably, the thickness can be configured such that at least the lower 1 / 3 of the vertical length along the pipe axis is thicker than the upper 2 / 3.

[0015] More preferably, the thickness can be configured such that a build-up is provided on the back surface opposite to the surface where the drainage hits, making it thick.

[0016] More preferably, the lower pipe includes an upper receiving port for fitting the upper pipe therein, and the position of the turning vane in the vertical direction along the pipe axis can be configured to be from directly below the upper receiving port to the end of the reduced-diameter portion.

[0017] More preferably, the maximum width of the turning vane can be configured to be 18 mm or more and 68 mm or less from the base of the inner wall of the lower pipe.

[0018] More preferably, in a front view of the turning vane, the angle downward from the position of the maximum width of the turning vane can be configured to be 0 deg or more and 15 deg or less.

[0019] More preferably, the shape of the surface of the turning vane where the drainage hits can be configured to be a planar shape above the position of the maximum width of the turning vane and a curved surface shape below the position of the maximum width of the turning vane.

[0020] More preferably, the lower pipe includes a straight pipe portion and a reduced-diameter portion, an upper receiving port for fitting the upper pipe is formed at the upper end of the straight pipe portion, there is no step on the outer peripheral surface from the upper end of the upper receiving port to the lower end of the straight pipe portion, and a step portion for locking the lower end of the upper pipe fitted in the upper receiving port is provided on the inner peripheral surface of the upper receiving port.

[0021] More preferably, it can be configured such that the wall thickness (t2) of the pipe wall of the straight pipe portion below from the lower end of the upper receiving port is thicker than the wall thickness (t5) of the upper receiving port.

[0022] More preferably, it can be configured such that the wall thickness (t4) of the pipe wall of the reduced-diameter portion is thicker than the wall thickness (t5) of the upper receiving port.

[0023] More preferably, it can be configured such that the straight pipe portion of the lower pipe is not provided with a vibration damping material.

[0024] More preferably, it can be configured such that the wall thickness (t2) of the pipe wall of the straight pipe portion below from the lower end of the upper receiving port is thicker than the wall thickness (t1) of the pipe wall of the straight pipe portion with a step where the outer peripheral surface is recessed at the lower end of the upper receiving port and the wall thickness is uniform.

[0025] More preferably, the lower pipe is provided with an outer layer member having a three-layer structure in the order of a vibration damping material, a vibration insulator, and a sound insulation cover from the inner layer side, and it can be configured such that the vibration damping material is not provided in the portion where the wall thickness is thick.

Advantages of the Invention

[0026] According to the present invention, there is provided a resin drainage collector pipe disposed in a through hole of a floor slab of a building, including an upper pipe protruding above the floor slab and a lower pipe connected below the upper pipe. In the drainage collector pipe in which the lower pipe has a reduced diameter portion and a swivel vane in the reduced diameter portion, since there is no inner surface below the swivel vane, the influence leading to a decrease in drainage capacity is small, and a drainage collector pipe in which there is no recess on the outer peripheral surface of the lower pipe (so that, for example, an outer layer member (outer layer cover) can be easily attached) can be provided. Further, according to the present invention, a drainage collector pipe capable of reducing damage to the swivel vane when performing maintenance on the drainage collector pipe from below the lower pipe can be provided. Further, according to the present invention, a drainage collector pipe capable of increasing the strength of a portion where the swivel vane is installed (the root portion of the swivel vane) and suppressing vibration and / or noise can be provided. Further, according to the present invention, a drainage collector pipe capable of omitting (or thinning) a part of an outer layer member having vibration damping performance and / or sound insulation performance attached to the outer peripheral surface of the lower pipe can be provided.

Brief Description of the Drawings

[0027]

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Mode for Carrying Out the Invention

[0028] Hereinafter, the drain collecting pipe according to the embodiment of the present invention will be described in detail with reference to FIGS. 1 to 16. In the following description, the outer peripheral surface, the outer surface, the outside, the outer layer side, the outer peripheral side, the outside, the inner layer side, the inner peripheral side, and the inside may not be clearly distinguished. Also, in the cross-sectional view, members that differ depending on the type of hatching may not be clearly distinguished. Further, for the ease of understanding of the present invention, in the top view, the direction of the lateral branch pipe may be specified using 0 o'clock, 3 o'clock, 6 o'clock, and 9 o'clock with the hour hand of the clock. Also, in the figure, the reference signs (consisting of a number + (optionally) an alphabet) attached to the dashed-dotted line together with the arrow indication indicate that the number is the figure number and the alphabet is the branch number (A, B, C, etc.) in that figure, and a cross-sectional view is shown in the figure specified by that reference sign. Also, the reference signs (consisting of a number + (optionally) an alphabet) attached to the dotted line in the figure indicate that the number is the figure number and the alphabet is the branch number (A, B, C, etc.) in that figure, and an enlarged view is shown in the figure specified by that reference sign (however, excluding the dotted line with the reference sign 1410S including the alphabet S indicating space). Note that the drain collecting pipe according to the present embodiment described below is not limited to either the drain collecting pipe for super high-rise buildings or the drain collecting pipe for intermediate floors (for intermediate floors, not for super high-rise buildings or the ground floor, and may be described as a standard drain collecting pipe). Also, when simply described as a drain collecting pipe, an upper pipe, and a lower pipe (without reference signs), it means a (standard) drain collecting pipe, a (standard) upper pipe, and a (standard) lower pipe that are not limited to either intermediate floors or super high-rise buildings.

[0029] <Combination of upper pipe and lower pipe in drain collecting pipe> With reference to FIGS. 1 to 2 showing the standard drain collecting pipe 1000, FIG. 3 showing the drain collecting pipe 1040 for super high-rise buildings, FIG. 4 showing the two-stage branch drain collecting pipe 1003, and FIGS. 5 to 16 for explaining the turning blade 1600 provided in the reduced diameter portion DR of the standard lower pipe 1500, the drain collecting pipe according to the present embodiment will be described.

[0030] First, the combination of the drainage collector pipes according to this embodiment will be described. The standard drainage collector pipe 1000 shown in these figures (especially FIG. 1) is composed of a standard upper pipe 1100 without a deflector plate 1200 and a standard lower pipe 1500 having a swivel vane 1600 connected below the standard upper pipe 1100. Also, the super high-rise drainage collector pipe 1040 shown in these figures (especially FIG. 3) is composed of a super high-rise upper pipe 1140 with a deflector plate 1200 and a standard lower pipe 1500 having a swivel vane 1600 connected below the super high-rise upper pipe 1140. Further, the two-stage branch drainage collector pipe 1003 shown in these figures (especially FIG. 4) is composed of a standard upper pipe 1100 without a deflector plate 1200, a two-stage lower branch body pipe 1104 connected below the standard upper pipe 1100, and a standard lower pipe 1500 connected below the two-stage lower branch body pipe 1104. The present invention is not limited to such a combination, and any drainage collector pipe can be used as long as it includes a lower pipe having a swivel vane with a reduced diameter portion provided with the features described later (including the standard lower pipe 1500 in common in FIGS. 1 to 4).

[0031] These three types (standard drainage collector pipe 1000, super high-rise drainage collector pipe 1040, two-stage branch drainage collector pipe 1003) of drainage collector pipes will be described. These three types of drainage collector pipes are all resin-made drainage collector pipes arranged in the through holes of the building floor slab.

[0032] Among these drainage collector pipes, the standard drainage collector pipe 1000 includes, as shown in FIG. 1, a standard upper pipe 1100 protruding above the floor slab and a standard lower pipe 1500 connected below the standard upper pipe 1100. The standard lower pipe 1500 is provided with a swivel vane 1600 at the reduced diameter portion DR. The position in the height direction where the swivel vane 1600 is provided is such that at least a part of the swivel vane 1600 overlaps with the reduced diameter portion DR.

[0033] Between the standard upper pipe 1100 and the standard lower pipe 1500, there may be connected one or more pipe materials (barrel pipes, extension pipes, etc.) whose presence or absence of the lateral branch pipe connection part 1120 is not limited. As in the case of the two-stage branch drainage collecting pipe 1003 shown in FIG. 4, between the standard upper pipe 1100 and the standard lower pipe 1500, a two-stage lower branch barrel pipe 1104 having a lateral branch pipe connection part 1120 is connected.

[0034] The standard upper pipe 1100 includes an upper riser connection part 1110 for connecting an upper riser that allows drainage to flow in from an upper floor, and at least one lateral branch pipe connection part 1120 for connecting a lateral branch pipe above the floor slab. The standard lower pipe 1500 includes a lower riser connection part for connecting a lower riser that allows drainage to flow out to a lower floor. Note that the lower riser connection part may be provided integrally with the lower pipe 1500 or separately, either is acceptable.

[0035] In addition, among these drainage collecting pipes, the super high-rise drainage collecting pipe 1040 is different from the above-described standard drainage collecting pipe 1000 in that, as shown in FIG. 3, the standard upper pipe 1100 protruding above the floor slab is changed to a super high-rise upper pipe 1140 provided with a flow deflection plate 1200.

[0036] The drainage collecting pipes shown in FIGS. 1 to 4 are common in that the lower pipe is the standard lower pipe 1500 and has a turning vane 1600 having the features of the present invention at its reduced diameter part DR.

[0037] Although it is an example, a riser socket 1112 and a rubber ring 1114 are provided at the upper riser connection part 1110, and through these, the upper riser and the drainage collecting pipe are connected. A lateral branch pipe socket 1122 and a rubber ring 1124 are provided at the lateral branch pipe connection part 1120, and through these, the lateral branch pipe and the drainage collecting pipe are connected.

[0038] In the drain collecting pipe according to this embodiment, as shown in FIGS. 1 and 3, in the top view of the drain collecting pipe looking from above, the lateral branch pipe connection parts 1120 are provided in the directions of 0 o'clock, 3 o'clock, and 6 o'clock, and not in the direction of 9 o'clock. However, it is sufficient to have at least one lateral branch pipe connection part 1120. Also, like this drain collecting pipe, the lateral branch pipe connection parts 1120 are provided at three locations other than 9 o'clock, and the lateral branch pipe connection parts 1120 in the directions where the lateral branch pipes are not connected may be plugged using plugs (these plugs may be plugged via the lateral branch pipe receiving ports 1122 and the rubber rings 1124).

[0039] <Upper pipe> In the upper pipe constituting the drain collecting pipe according to this embodiment, there may be provided a flow deflection plate 1240 for decelerating the flowing-down drain or cutting the water film formed by the drain, or a backflow prevention rib for preventing the drain flowing into the drain collecting pipe from the lateral branch pipe from flowing back to the adjacent lateral branch pipe. It may be provided.

[0040] Here, the super high-rise upper pipe 1140 constituting the super high-rise drain collecting pipe 1040 is provided with a flow deflection plate 1200 protruding inward in the direction where the lateral branch pipe connection part 1120 is not provided (here, the direction of 9 o'clock) in order to change the flow of the drain. Also, in this super high-rise drain collecting pipe 1040, the standard lower pipe 1500 connected to the super high-rise upper pipe 1140 is provided with turning blades 1600 protruding inward in order to change the flow of the drain. In this way, the super high-rise drain collecting pipe 1040 is provided with these flow deflection plates 1200 and turning blades 1600. By positioning the upper end, which is the starting point of the flow deflection plate 1200, below the pipe axis of the lateral branch pipe connection part 1120, it is possible to prevent the drain with a turning component imparted by the flow deflection plate 1200 from flowing back to the lateral branch pipe. Also, by positioning the lower end, which is the ending point of the flow deflection plate 1200, above the upper end 1600U of the turning blades 1600, the swirling flow induced by the flow deflection plate 1200 is taken over by the turning blades 1600, and the turning component of the swirling flow is further increased by the turning blades 1600, thus exhibiting the operational effects.

[0041] As described above, the upper pipe 1140 for super high-rise buildings of the drainage manifold 1040 for super high-rise buildings is provided with a flow deflection plate 1200 protruding inwardly on the inner circumference in the direction (here, the 9 o'clock direction) without the lateral branch pipe connection portion 1120 in order to change the flow of drainage. And, as shown in FIG. 3, the drainage manifold 1040 for super high-rise buildings is provided with a recess for forming the flow deflection plate 1200 on the outer peripheral surface of the upper pipe 1140 for super high-rise buildings provided with this flow deflection plate 1200.

[0042] Here, although not limited, in the drainage manifold 1040 for super high-rise buildings, the longitudinal pipe axis of the upper pipe 1140 for super high-rise buildings and the longitudinal pipe axis of the standard lower pipe 1500 coincide to form the axis of the drainage manifold 1040 for super high-rise buildings, and the recess can be provided with ribs 1400 including a plane perpendicular to this axis. Here, the recess is an essential configuration, but this rib 1400 is an optional configuration, and it may only be provided with a recess for forming the flow deflection plate 1200 on the outer peripheral surface of the upper pipe 1140 for super high-rise buildings without the rib 1400. The rib 1400 includes a plurality (here, 4) of body-diameter ribs 1410 and the lowermost (one) rubber ring positioning rib 1412 whose protrusion lengths are different from those of these body-diameter ribs 1410. The outer diameter of the body-diameter rib 1410 is substantially the same as the outer diameter of the body (= body diameter), and the body is the straight pipe portion immediately below the lateral branch pipe connection portion 1120 in the upper pipe 1140 for super high-rise buildings, and the body diameter means the outer diameter here.

[0043] Here, this recess (regardless of the presence or absence of ribs) can be provided with a function of reducing vibration or noise generated when drainage hits the protrusion (flow deflection plate 1200). Furthermore, the effect of reducing vibration or noise generated when drainage hits the protrusion (flow deflection plate 1200) can be manifested by the air staying in the recess (regardless of the presence or absence of ribs) (the air staying in the space 1410S formed between the ribs 1400 when the ribs 1400 are provided).

[0044] <Outer layer member> Here, the outer layer member (outer layer cover) wound around these drain collecting pipes will be described. These outer layer members 1700 have a three-layer structure and are provided on the outer peripheral surfaces of the upper pipe and / or the lower pipe of the drain collecting pipe in the order of the vibration damping material 1714 (or the thermally expandable refractory material 1712), the vibration insulator 1720 formed of refractory inorganic fibers, and the sound insulation cover 1730 from the outer surface of the drain collecting pipe. The innermost layer 1710 in this three-layer structure is either the vibration damping material 1714 or the thermally expandable refractory material 1712. That is, as shown in FIGS. 1 to 4, the innermost layer 1710 of the outer layer member having a three-layer structure is provided with the vibration damping material 1714 or the thermally expandable refractory material 1712. The form of this thermally expandable refractory material 1712 is not limited to any of a refractory paste, a refractory sheet, a refractory tape, etc.

[0045] <lower pipe> The lower pipe constituting the drain collecting pipe according to the present embodiment (shown in FIGS. 1 to 4) is the standard lower pipe 1500, and a turning vane 1600 having the features of the present invention is provided at its reduced diameter portion DR. This turning vane 1600 is integrally resin-molded as the standard lower pipe 1500, but does not have a second inner surface or a third inner surface below the turning vane 1600 as in Patent Document 1 (features of the present invention). This feature of the present invention will be described in detail below with reference to FIGS. 5 to 16 in addition to FIGS. 1 to 4.

[0046] <turning vane> As shown in FIGS. 5(A) to 5(D), when the turning blade 1600 is viewed from above along the axis of the lower pipe 1500, the outer edge of the turning blade 1600 has a shape convex toward the inner peripheral side. Here, the outer edge of the turning blade refers to a line that connects from the upper end 1600U to the lower end 1600D of the turning blade 1600 shown in FIGS. 1(B), 2(B), 3(B), 4, and 5(A) (although it is an example), and includes inflection points C(1) and C(2) as shown in FIG. 5(A) when the turning blade 1600 is viewed from above along the axis of the lower pipe 1500. It appears as the outer shape of the turning blade 1600, which is composed of a linear shape, a curved shape, or a composite shape of a linear shape and a curved shape. And the fact that this outer edge has a shape convex toward the inner peripheral side means that the line from the starting point on the inner wall of the lower pipe, which is the starting point of the turning blade 1600 (the upper end 1600U of the turning blade 1600), to the ending point on the inner wall of the lower pipe, which is the ending point of the turning blade (the lower end 1600D of the turning blade 1600), is not a linear shape (not a linear shape like the blade plate shown in FIG. 2 of Japanese Patent No. 3567427), but includes a linear shape convex toward the inner peripheral side, a curved shape convex toward the inner peripheral side, or a composite shape of a linear shape and a curved shape convex toward the inner peripheral side. It may be any shape other than these, and the shape convex toward the inner peripheral side means that at least a part of the outer edge of the turning blade 1600 protrudes toward the inner peripheral side (a shape other than the linear shape connecting the starting point and the ending point of the turning blade).

[0047] And although the outer edge of the turning blade 1600 thus has a shape convex toward the inner peripheral side (the same as the turning blade shown in FIG. 3 of Patent Document 1) and is not linear, the outer peripheral surface of the standard lower pipe 1500 where the turning blade 1600 is located does not have a recess (like the lower connecting pipe shown in Patent Document 1). Since there is no recess on the outer peripheral surface of the standard lower pipe 1500 in this way, the appearance design is favorable, and for example, it is easy to attach an outer layer member (outer layer cover) 1700.

[0048] Further, as shown in FIGS. 5(A) to 5(D), when the turning blade 1600 is viewed from above along the axis of the standard lower pipe 1500, there is no step on the inner surface of the standard lower pipe 1500 between the portion hidden by the turning blade 1600 and the portion not hidden. Specifically, there is no step (the step formed by the second inner surface and the third inner surface in the lower connecting pipe shown in Patent Document 1) between the portion hidden by the turning blade 1600 (region S(1) shown in FIG. 5(B)) and the portion not hidden by the turning blade 1600 (region S(2) shown in FIG. 5(C)) (the boundary HL shown in FIG. 5(C)). Since there is no second inner surface and a third inner surface extending radially from the end of the second inner surface below the turning blade of the lower connecting pipe as in Patent Document 1, the presence of the second inner surface and the third inner surface cannot sufficiently secure an air passage (especially when air tries to flow downward along the reduced-diameter portion DR (inclined pipe portion), the presence of the third inner surface forms a wall, narrowing the air passage toward the lower part of the turning blade and making it impossible to sufficiently secure the air passage), and the influence of the increase in the internal pressure leading to a decrease in the drainage capacity can be reduced.

[0049] Further, as shown in FIGS. 6 to 9, the thickness of the turning blade 1600 in a cross section perpendicular to the axis of the pipe is thicker in the lower part (the lower part 1620 of the turning blade 1600) than in the upper part (the upper part 1610 of the turning blade 1600). The thickness is such that at least the lower 1 / 3 of the vertical length along the axis of the pipe is thicker than the upper 2 / 3. In FIG. 2(B), an example is shown where the lower 1 / 3 of the vertical length along the axis of the pipe is thicker than the upper 2 / 3 (for example, an example where a build-up portion 1600T is provided in the lower 1 / 3 of the vertical length along the axis of the pipe). By thickening the lower part of the turning blade 1600 in this way, for example, when maintaining the drainage collecting pipe 1000 from below the standard lower pipe 1500 (although it is an example, when a high-pressure cleaning nozzle penetrates from below the lower pipe 1500 and hits the lower part of the turning blade 1600 when cleaning the inside of the drainage collecting pipe 1000), the damage to the turning blade 1600 can be reduced or avoided.

[0050] Also, the increase in thickness of the lower part (the lower part 1620 of the swivel vane 1600) (from the thickness of the upper part 1610 of the swivel vane 1600) is built up on the back surface opposite to the surface where the drainage hits and is thick. As shown in FIGS. 7(F), 8, and 9, on the back surface opposite to the surface where the drainage hits, a so-called built-up part 1600T is provided so as to be thicker than the back surface when not built up, which is indicated by a dotted line. In the cross-sectional views shown in FIGS. 7(F), 8(D)-(F), and 9(D)-(F), the dotted line indicates the back surface of the swivel vane without the built-up part, and the portion between the solid line indicating the back surface of the swivel vane 1600 according to the present embodiment and the dotted line is the built-up part 1600T. Since the increase in thickness is built up on the back surface opposite to the surface where the drainage hits and is thick, it has nothing to do with the change in drainage (generation of swirling flow) by the swivel vane, and a sufficient swirling flow can be generated in the same manner as the swivel vane without the built-up part 1600T.

[0051] Also, as shown in FIG. 2(B) (reference numerals are omitted in other figures), the standard lower pipe 1500 includes an upper receiving port 1510 that fits the upper pipe 1100 (or the body pipe 1104 for the two-stage lower branch). As shown in FIGS. 1(B), 2(B), 3(B), and 4, the position of the swivel vane 1600 in the vertical direction along the pipe axis is from directly below the upper receiving port 1510 to the end of the reduced-diameter portion DR. Thereby, (since the second inner surface and the third inner surface in the lower connecting pipe shown in Patent Document 1 do not exist), a sufficient swirling flow can be generated without reducing the drainage capacity.

[0052] Furthermore, the shape of the swivel vane 1600 will be described in detail with reference to FIG. 12.

[0053] The maximum width T of the swivel vane 1600, as shown in the top view of the standard lower pipe 1500 shown in Fig. 12(A), is 18 mm or more (equal to or greater than the inner diameter of the riser pipe connected to the upper riser connection part 1110) and 68 mm or less (equal to or less than the core of the riser pipe of the upper riser connection part 1110) from the root of the inner wall of the lower pipe 1500. The reason for setting it to 18 mm or more is to efficiently send the drainage from the upper floor to the lower floor, and the reason for setting it to 68 mm or less is to ensure a passage for air to the core of the riser pipe of the upper riser connection part 1110. By these means, the desired drainage capacity can be achieved.

[0054] Also, the angle α downward from the position of the maximum width T of the swivel vane 1600, as shown in the side view of the standard lower pipe 1500 (front view of the swivel vane) shown in Fig. 12(B), is 0 deg or more and 15 deg or less. The reason for this range of the angle α is to swivel the drainage from the upper floor hitting the swivel vane 1600, and by this means, the desired drainage capacity can be achieved.

[0055] In Fig. 12, it is preferable that the position of the maximum width T of the swivel vane 1600 is in the straight pipe part (straight part) SR with a larger pipe diameter above rather than in the reduced diameter part (taper part) DR of the standard lower pipe 1500. This is because if the maximum width T of the swivel vane 1600 is in the reduced diameter part (taper part) DR, the space inside the pipe in the standard lower pipe 1500 will be narrowed, and it may be difficult to form a passage for air.

[0056] Also, the shape of the surface of the swivel vane 1600 where the drainage hits is a planar shape above the position of the maximum width T of the swivel vane 1600 and a curved surface shape below the position of the maximum width T of the swivel vane 1600. The reason for such a shape is that the planar shape above the position of the maximum width T of the swivel vane 1600 widely collects the drainage from the upper floor, and the curved surface shape below the position of the maximum width T of the swivel vane 1600 swirls the collected drainage along the pipe wall without letting it escape, and by this means, the desired drainage capacity can be achieved.

[0057] As described with reference to FIG. 2(B), the thickness of the swivel blade 1600 is such that the lower 1 / 3 of the vertical length along the pipe axis is thicker than the upper 2 / 3. For example, a build-up portion 1600T is provided in the lower 1 / 3 of the vertical length along the pipe axis. By thickening the lower part of the swivel blade 1600 in this way, for example, when maintaining the drainage collecting pipe 1000 from below the standard lower pipe 1500 (in one example, when a high-pressure cleaning nozzle penetrates from below the lower pipe 1500 and hits the lower part of the swivel blade 1600 while cleaning the inside of the drainage collecting pipe 1000), damage to the swivel blade 1600 can be reduced or avoided. For example, as shown in FIGS. 2(B) and 13(B), since the build-up portion 1600T is provided in the lower 1 / 3 of the vertical length along the pipe axis of the swivel blade 1600, when looking at the drainage collecting pipe 1000 from below the standard lower pipe 1500 as shown in FIG. 13(C) (when looking at the advancing direction of the high-pressure cleaning nozzle), it can be seen that the strength of the lower part of the swivel blade 1600 where the high-pressure cleaning nozzle may first hit is increased.

[0058] Also, as shown in FIGS. 14 and 15, in order to increase the rigidity of the standard lower pipe 1500 for suppressing vibration of the standard lower pipe 1500 during drainage, it is also preferable to add a back rib 1600R to the back side (the surface not hit by the drainage) of the swivel blade 1600. In this case, the number and shape of the back ribs are not limited, and the positions may be arranged uniformly or non-uniformly.

[0059] Also, as shown in FIG. 16, in order to increase the rigidity of the standard lower pipe 1500 for suppressing vibration of the standard lower pipe 1500 during drainage, it is also preferable to provide an outer peripheral rib 1500DR on the reduced diameter portion (taper portion) DR on the outer periphery of the standard lower pipe 1500 (FIG. 16(A)), or provide an outer peripheral rib 1500SR on the straight pipe portion (straight portion) SR (FIG. 16(B)). In this case, the number and shape of the outer peripheral ribs are not limited, and the positions where the outer peripheral ribs are provided may be, as described above, the reduced diameter portion (taper portion) DR, the straight pipe portion (straight portion) SR, or both, and any of them is acceptable.

[0060] As described above, the thickness of the turning vane 1600 shown in FIGS. 2(B) and 13(B) has a build-up portion 1600T in the lower 1 / 3 of the vertical length along the pipe axis to increase the strength of the lower part of the turning vane 1600. In addition to this, it is also preferable that the shape of the lower end 1600D of the turning vane 1600 be as follows. As shown in FIG. 17(B), this turning vane 1600 has a shape that protrudes obliquely inward from the lower end 1600D, which is the end point of the turning vane 1600, for the purpose of preventing breakage of the lower part of the turning vane 1600. In a known drain collecting pipe (as shown in FIG. 2 of Patent Document 1, for example), when the lower end of the turning vane protrudes straight laterally to the inner peripheral side (has a straight lateral convex shape), when a high-pressure cleaning nozzle for maintenance enters from below, the high-pressure cleaning nozzle hits the convex part (it is difficult for the high-pressure cleaning nozzle to escape), and the turning vane may be damaged. On the other hand, in the drain collecting pipes (standard drain collecting pipe 1000, super high-rise drain collecting pipe 1040, and two-stage branch drain collecting pipe 1003) according to the present embodiment, since the lower end 1600D, which is the end point of the turning vane 1600, has a shape that protrudes obliquely inward, that is, by making the convex part oblique, (it is easy for the high-pressure cleaning nozzle to escape in the oblique direction), it becomes easier to reduce or avoid breakage of the turning vane 1600. When making this convex part oblique, as shown in FIG. 17(B), the angle β is preferably 20 (deg) to 60 (deg) (20 ≤ β ≤ 60 (deg)), and about 40 (deg) is particularly preferable. Also, the angle β in FIG. 17(B) is the angle formed by a line perpendicular to the pipe axis and the outer contour line of the turning vane 1600 at the lower end 1600D of the turning vane. Note that it is preferable that the drain collecting pipe according to the present invention has no recess on the outer peripheral surface of the lower pipe. However, in the case of having a shape that protrudes obliquely inward from the lower end 1600D, which is the end point of the turning vane 1600 as described above, the present invention does not exclude drain collecting pipes having a recess on the outer peripheral surface.

[0061] In the drainage collector pipes (standard drainage collector pipe 1000, super high-rise building drainage collector pipe 1040, and two-stage branch drainage collector pipe 1003) according to this embodiment, the lower pipe 1500 is provided with a turning vane 1600. However, in order for the water stop plug used during the full water test of the drainage pipe to pass through, it is preferable to have a shape that satisfies the following passing ball diameter. In the case of the nominal diameter 100 of the riser pipe (upper riser pipe) connected via the riser socket 1112 and the rubber ring 1114 provided at the upper riser pipe connection portion 1110 of the drainage collector pipe, it is preferable to ensure a passing ball diameter of 80 mm or more at any cross-section of the drainage collector pipe, and it is particularly preferable to ensure a passing ball diameter of 85 mm or more. More specifically, as shown in FIG. 18(B), a passing ball diameter of φ90 mm is ensured in the deflection plate portion (the portion where the deflection plate 1240 is located), and as shown in FIG. 18(C), a passing ball diameter of φ95 mm is ensured in the maximum turning vane width portion (the portion where the maximum width T shown in FIG. 12 is located). As shown in FIG. 18(D), a passing ball diameter of φ86 mm is ensured in the convex portion at the lower end of the turning vane (the portion where the inner diameter of the lower pipe is narrowed at the reduced diameter portion DR and becomes the minimum passing ball diameter of the drainage collector pipe near the lower end 1600D of the turning vane). On the other hand, for example, in the collective joint disclosed in Patent Document 1, at the lower end of the inclined pipe portion with the smallest inner diameter, the lower end of the turning vane protrudes horizontally to the inner peripheral side, so there is a possibility that the minimum passing ball diameter becomes small, and there is a possibility that the water stop plug used during the full water test of the drainage pipe may be caught. In addition, the 18C-18C cross-section shown in FIG. 18 is the vertical opposite cross-section of 6C-6C in FIG. 5, and the 18D-18D cross-section shown in FIG. 18 is the vertical opposite cross-section of 9B-9B in FIG. 5. Although it is preferable that there is no recess on the outer peripheral surface of the lower pipe in the drainage collector pipe according to the present invention, in the case of ensuring a passing ball diameter of 80 mm or more at any cross-section of the drainage collector pipe as described above, the present invention does not exclude the drainage collector pipe having a recess on the outer peripheral surface of the lower pipe.

[0062] As described above, according to the drain collecting pipe according to the present embodiment, it is a resin drain collecting pipe disposed in the through-hole of the floor slab of a building, including an upper pipe protruding above the floor slab and a lower pipe connected below the upper pipe. In the drain collecting pipe in which the lower pipe has a reduced diameter portion and a swivel vane in the reduced diameter portion, since there is no inner surface below the swivel vane, the influence leading to a decrease in drainage capacity is small, and a drain collecting pipe in which there is no recess on the outer peripheral surface of the lower pipe (so that, for example, an outer layer member (outer layer cover) can be easily attached) can be provided. Further, according to the drain collecting pipe according to the present embodiment, a drain collecting pipe capable of reducing the breakage of the swivel vane when performing maintenance on the drain collecting pipe from below the lower pipe can be provided.

[0063] <<Modification Example>> Hereinafter, a drain collecting pipe (standard lower pipe 1501) according to a modification of the embodiment of the present invention shown in FIG. 19 (hereinafter referred to as "according to this modification") will be described. In the following description, refer to FIG. 14. This standard lower pipe 1501 is applicable to any of the standard drain collecting pipe 1000 (standard upper pipe 1100 + standard lower pipe 1500), the super high-rise drain collecting pipe 1040 (super high-rise upper pipe 1140 + standard lower pipe 1500), and the two-stage branch drain collecting pipe 1003 (standard upper pipe 1100 + two-stage lower branch body pipe 1104 + standard lower pipe 1500).

[0064] As shown in FIG. 19, this standard lower pipe 1501, like the above-described standard lower pipe 1500, includes a straight pipe portion SR and a reduced diameter portion DR. An upper receiving port for fitting an upper pipe (here, the standard upper pipe 1100) is formed at the upper end of the straight pipe portion SR, and there is no step on the outer peripheral surface from the upper end of the upper receiving port to the lower end of the straight pipe portion SR (including the recess on the outer peripheral surface as shown in FIG. 14(B)), and a step portion for locking the lower end of the upper pipe fitted in the upper receiving port is provided on the inner peripheral surface of the upper receiving port.

[0065] Also, in this standard lower pipe 1501, the wall thickness (t2) of the pipe wall of the straight pipe portion below the lower end of the upper receiving port is thicker than the wall thickness (t5) of the (pipe wall) at the upper receiving port. Also, in this standard lower pipe 1501, the wall thickness (t4) of the pipe wall of the reduced diameter portion DR is thicker than the wall thickness (t5) of the (pipe wall) at the upper receiving port.

[0066] Also, the straight pipe portion SR of the standard lower pipe 1501 is not provided with the vibration damping material 1714. Although the outer layer member 1700 provided with the vibration damping material 1714 in the innermost layer is wound around the straight pipe portion SR of the standard lower pipe 1500 shown in FIGS. 1 to 4, the outer layer member 1701 not provided with the vibration damping material 1714 in the innermost layer is wound around the straight pipe portion SR of the standard lower pipe 1501 according to this modified example shown in FIG. 19. In the standard lower pipe 1501 according to this modified example, since vibration and / or noise caused by the turning blades or the like can be absorbed by the thick wall thickness of the pipe wall, the straight pipe portion SR of the standard lower pipe 1501 can be made not to be provided with the vibration damping material 1714.

[0067] The wall thickness (t2) of the pipe wall of the straight pipe portion SR below the lower end of the upper receiving port in the standard lower pipe 1501 according to this modified example shown in FIG. 19 is thicker than the wall thickness (t1) of the pipe wall of the straight pipe portion SR in which the outer peripheral surface has a step where the wall thickness becomes uniform at the lower end of the upper receiving port in the standard lower pipe 1500 shown in FIG. 14.

[0068] In the reduced-diameter portion (taper portion) DR of the standard lower pipe 1501 according to this modified example shown in Fig. 19, the wall thickness t4 of the pipe wall is thicker than the wall thickness t4' of the reduced-diameter portion (taper portion) DR of the standard lower pipe 1500 shown in Fig. 14. Note that the wall thickness (t5) of the upper receiving port of the standard lower pipe 1501 according to this modified example shown in Fig. 19 is equal to the wall thickness (t5) of the upper receiving port of the standard lower pipe 1500 shown in Fig. 14, and this wall thickness (t5) is approximately equal to the wall thickness t1 of the straight pipe portion SR of the standard lower pipe 1500 shown in Fig. 14. When the wall thickness of the reduced-diameter portion DR is thick in addition to the straight pipe portion SR like this, the thick wall thickness of the pipe wall can absorb vibrations and / or noises caused by the swivel blades or the like. Therefore, in the standard lower pipe 1501 according to this modified example, the vibration damping material 1714 may not be provided in the straight pipe portion SR, or a thin vibration damping material 1714 may be provided in the reduced-diameter portion DR.

[0069] As shown in Figs. 1 to 4, in the standard lower pipe 1500 of the drain collecting pipe, the outer layer member 1700 having a three-layer structure is provided so as to be wound around the outer surface in the order of the vibration damping material 1714, the vibration insulator 1720, and the sound insulation cover 1730 from the inner layer side. And in the outer layer member 1700, the vibration damping material 1714 is provided in the portion of the straight pipe portion SR of the standard lower pipe 1500. However, the outer layer member 1701 provided so as to be wound around the standard lower pipe 1501 according to this modified example does not have the vibration damping material 1714 in the portion where the wall thickness is thick (the portion of the wall thickness (t2) of the straight pipe portion SR downward from the lower end of the upper receiving port) as shown in Fig. 19. In the standard lower pipe 1501 according to this modified example, since the wall thickness (t2) of the straight pipe portion downward from the lower end of the upper receiving port is thick, the thick wall thickness of the pipe wall can absorb vibrations and / or noises caused by the swivel blades or the like with the pipe wall. Therefore, the vibration damping material 1714 may not be provided in the straight pipe portion SR of the standard lower pipe 1501.

[0070] As described above, according to the drain collecting pipe according to this modified example, in addition to the effects of the drain collecting pipe according to the above-described (other than this modified example) embodiments, the following effects can be exhibited.

[0071] In this standard lower pipe 1501, the wall thickness (t2) of the lower straight pipe portion from the lower end of the upper receiving port is thicker than the wall thickness (t5) at the upper receiving port, or the wall thickness (t4) of the wall of the reduced diameter portion DR is thicker than the wall thickness (t5) at the upper receiving port, or the wall thickness (t2) of the wall of the lower straight pipe portion SR from the lower end of the upper receiving port in the standard lower pipe 1501 is thicker than the wall thickness (t1) of the wall of the straight pipe portion SR that has a step where the outer peripheral surface is recessed at the lower end of the upper receiving port in the standard lower pipe 1500 shown in FIG. 14 so that the wall thickness is uniform. Therefore, for the swivel blade it is possible to increase the strength of the portion where the swivel blade is installed (the root portion of the swivel blade) to suppress vibration and / or noise caused by the swivel blade or the like, or to omit (reduce the number of parts), thin, or otherwise modify a damping performance and / or sound insulation performance outer layer member (a part thereof: here, the damping material 1714 in the straight pipe portion SR) that was attached to the outer peripheral surface of the lower pipe.

[0072] Also, a characteristic shape of the standard lower pipe 1501 according to this modification example is that an upper receiving port for fitting an upper pipe (here, the standard upper pipe 1100) is formed at the upper end of the straight pipe portion SR, there is no step on the outer peripheral surface from the upper end at the upper receiving port to the lower end at the straight pipe portion SR, and a step portion for locking the lower end of the upper pipe fitted in the upper receiving port is provided on the inner peripheral surface of the upper receiving port. This shape is suitable for increasing the strength of the portion where the swivel blade is installed (the root portion of the swivel blade) to suppress vibration and / or noise caused by the swivel blade or the like, or for omitting or thinning a part of the outer layer member having damping performance and / or sound insulation performance that was attached to the outer peripheral surface of the lower pipe to exhibit the effect.

[0073] It should be considered that all aspects of the embodiments disclosed this time are illustrative and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims are included.

Industrial Applicability

[0074] The present invention is preferably applied to a resin drainage manifold provided through the floor slab of a building. Since there is no inner surface below the swivel vane, it has little impact on reducing drainage capacity. In particular, it is preferably applied to a drainage manifold in which there is no recess on the outer peripheral surface of the lower pipe (so that, for example, an outer layer member (outer layer cover) can be easily attached). Also, it is particularly preferably applied to a drainage manifold that can reduce damage to the swivel vane when performing maintenance on the drainage manifold from below the lower pipe. Further, the present invention is particularly preferably applied to a drainage manifold that can increase the strength of the portion where the swivel vane is installed (the base portion of the swivel vane) to suppress vibration and / or noise. Additionally, it is particularly preferably applied to a drainage manifold in which a part of the outer layer member (with vibration damping performance and / or sound insulation performance) attached to the outer peripheral surface of the lower pipe can be omitted (or made thinner).

Explanation of Reference Numerals

[0075] 1000 (Standard) Drainage Manifold 1100 (Standard) Upper Pipe 1200 Deflection Plate 1410 Barrel Equal-Diameter Rib 1412 Rubber Ring Positioning Rib 1500 (Standard) Lower Pipe 1501 (Standard) Lower Pipe According to a Modified Example 1600 Swivel Vane 1610 Upper Portion of the Swivel Vane 1620 Lower Portion of the Swivel Vane 1600U Upper End of the Swivel Vane 1600D Lower End of the Swivel Vane 1600T Build-Up Portion 1700 Outer Layer Member (Outer Layer Cover)

Claims

1. A resin drainage manifold disposed in a through hole of a building floor slab, wherein the drainage manifold includes an upper pipe protruding above the floor slab and a lower pipe connected below the upper pipe, the lower pipe is provided with a reduced-diameter portion and a swivel vane in the reduced-diameter portion, when the swivel vane is viewed from above along the pipe axis of the lower pipe, the outer edge of the swivel vane has a shape convex toward the inner peripheral side, the outer peripheral surface of the lower pipe where the swivel vane is located is characterized by having no recess, a drainage manifold.

2. When the swivel vane is viewed from above along the pipe axis of the lower pipe, there is no step between the portion hidden by the swivel vane and the non-hidden portion on the inner surface of the lower pipe, the drainage manifold according to claim 1.

3. The thickness of the swivel vane in a cross section perpendicular to the pipe axis is characterized in that the lower part is thicker than the upper part, the drainage manifold according to claim 1.

4. The thickness is such that at least the lower 1 / 3 of the vertical length along the pipe axis is thicker than the upper 2 / 3, the drainage manifold according to claim 3.

5. The thickness is characterized by being thickened by build-up on the back surface opposite to the surface where the drainage hits, the drainage manifold according to claim 3.

6. The lower pipe includes an upper receiving port for fitting the upper pipe therein, the position of the swivel vane in the vertical direction along the pipe axis is from directly below the upper receiving port to the end of the reduced-diameter portion, the drainage manifold according to any one of claims 1 to 5.

7. The maximum width of the swivel vane is 18 mm or more and 68 mm or less from the root of the inner wall of the lower pipe, the drainage manifold according to any one of claims 1 to 5.

8. In a front view of the swivel vane, the angle downward from the position of the maximum width of the swivel vane is 0 deg or more and 15 deg or less, the drainage manifold according to any one of claims 1 to 5.

9. The shape of the surface where the drainage hits on the swivel vane is a flat shape above the position of the maximum width of the swivel vane and a curved shape below the position of the maximum width of the swivel vane, the drainage manifold according to any one of claims 1 to 5.

10. The lower pipe includes a straight pipe portion and a reduced-diameter portion, An upper receiving port for fitting the upper pipe is formed at the upper end of the straight pipe portion, there is no step on the outer peripheral surface from the upper end of the upper receiving port to the lower end of the straight pipe portion, and a step portion for locking the lower end of the upper pipe fitted in the upper receiving port is provided on the inner peripheral surface of the upper receiving port. The drainage manifold according to any one of claims 1 to 5, characterized in that.

11. The drainage manifold according to claim 10, characterized in that the wall thickness of the straight pipe portion below from the lower end of the upper receiving port is thicker than the wall thickness of the upper receiving port.

12. The wall thickness of the reduced diameter portion is thicker than the wall thickness of the upper receiving port, characterized in that The drainage manifold according to claim 10.

13. The drainage manifold according to claim 10, characterized in that the straight pipe portion of the lower pipe is not provided with a vibration damping material.

14. The drainage manifold according to claim 10, characterized in that the wall thickness of the straight pipe portion below from the lower end of the upper receiving port is thicker than the wall thickness of the straight pipe portion having a uniform wall thickness with a step in which the outer peripheral surface is recessed at the lower end of the upper receiving port.

15. The lower pipe is provided with an outer layer member having a three-layer structure in the order of a vibration damping material, a vibration insulator, and a sound insulation cover from the inner layer side, The drainage manifold according to claim 14, characterized in that the vibration damping material is not provided in the portion where the wall thickness is thick.

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