Collective joint and joint structure

Abstract

To simplify a structure and facilitate the manufacture.SOLUTION: Provided is a collective joint including an upper connecting pipe and a lower connecting pipe. The upper connecting pipe includes a horizontal pipe connecting portion and a bushing 50 connected to the horizontal pipe connecting portion. The bushing 50 has a main pipe 51, a partition wall 52, a blocking portion 53, a packing, and an eccentric ring. The main pipe 51 has a first end fitted into the horizontal pipe connecting portion, and a second end protruding from the horizontal pipe connecting portion. The partition wall 52 is provided within the main pipe 51 and divides the inside of the main pipe 51 into a first space S1 and a second space S2 in a cross section intersecting a central axis of the main pipe 51. The blocking portion 53 blocks the first space S1. The packing is arranged within an end of the second space S2. The eccentric ring is fitted into an end of the first space S1 and the second end of the main pipe 51.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a mass joint and a joint structure. [Background technology]

[0002] BACKGROUND ART Joints such as those described in Patent Document 1 below have been known in the past. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-208257 Summary of the Invention [Problem to be solved by the invention]

[0004] However, it is desirable for this type of joint to have a simple structure and be easy to manufacture.

[0005] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to simplify the structure and facilitate the manufacture. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention proposes the following means. The bushing of the present invention comprises a main tube, a partition wall disposed within the main tube and dividing the interior of the main tube into a first space and a second space in a cross section intersecting the central axis of the main tube, a closing portion that closes the first space, and a protruding portion that protrudes from the partition wall into the second space.

[0007] The bushing is placed, for example, between a first pipe and a second pipe of different diameters, and connects the two pipes after adjusting the difference in diameter between them (note that the first pipe and second pipe here include joints). For example, the first pipe and the second pipe can be connected by inserting the main pipe into the first pipe and then inserting a second pipe with a smaller diameter than the first pipe into the second space. In this bushing, the protruding portion protrudes from the partition wall into the second space, so that when the second pipe is inserted into the second space, part of the outer surface of the second pipe abuts against the protruding portion, thereby holding the second pipe in the second space. The protruding portion protrudes into the second space. Therefore, by increasing or decreasing the protruding dimension of the protruding portion into the second space, the cross-sectional area (inner diameter) of the second space can be increased or decreased while fixing the position and shape of the partition wall. Therefore, it is possible to form a second space that can accommodate second pipes of various sizes while ensuring design freedom regarding the position and shape of the partition wall. However, when manufacturing a bushing using a mold, for example, the shape of the first space or the second space (the shape of the partition wall) may restrict the direction in which the mold can be removed from the first space or the second space. Due to this restriction, the position of the closure portion in the central axis direction may be limited depending on the position and shape of the partition wall. In some cases, it may be necessary to form the closure portion as a separate member from the main pipe and attach the closure portion to the main pipe later. However, this bushing allows for greater freedom in the design of the partition wall. Therefore, even while the closure and the main pipe are integrally molded, the axial position of the closure is less likely to be restricted, increasing the degree of freedom in the axial position of the closure. As a result, for example, the closure can be positioned at the end of the main pipe in the axial direction. This, for example, simplifies manufacturing and prevents fluid from flowing into the first space.

[0008] The blocking portion may be provided at an end portion of the main tube in the central axis direction.

[0009] The blocking portion is provided at the end of the main tube in the central axis direction, and therefore, it is possible to prevent fluid from flowing into the first space from the side where the blocking portion is provided.

[0010] The protruding portion may include a plurality of protrusions.

[0011] The overhanging portion has a plurality of protrusions. Therefore, the overhanging portion can be formed by increasing the thickness of the partition wall at the portion where the overhanging portion is provided only in the portion corresponding to the protrusions. Therefore, the thickened portion of the partition wall can be limited to a narrow range. When a bushing is injection molded using a resin or rubber material, sink marks in the material tend to occur in thicker portions, leading to poor quality. However, by providing a protruding portion (projection) in a portion of the wall while maintaining the thickness of the partition wall, it is possible to prevent sink marks and other issues from occurring during molding. This makes it possible to simplify the manufacture of the bushing.

[0012] The protruding portion may be provided only in a portion of the partition wall along the central axis direction of the main tube.

[0013] The protruding portion is provided only on a portion of the main tube in the axial direction. Therefore, when inserting the end of the second tube into the second space, excessive frictional resistance between the second tube and the protruding portion can be prevented. This makes it easy to insert the second tube into the second space.

[0014] The joint structure according to the present invention comprises a joint assembly having a plurality of pipe connection sections to which end portions of pipe bodies are connected, and a bush as described above provided at the pipe connection section.

[0015] The bushing is disposed between the pipe connection part of the manifold and the pipe body, which have different diameters, and connects them after adjusting the difference in diameter between them. For example, the pipe connection part of the manifold can be connected to the pipe body by inserting the main pipe into the pipe connection part of the manifold and connecting the pipe body, which has a smaller diameter than the pipe connection part, to the second space. In this bushing, the protruding portion protrudes from the partition wall into the second space, so that a part of the outer surface of the pipe inserted into the second space abuts against the protruding portion, thereby holding the pipe in the second space. The protruding portion protrudes into the second space. Therefore, by increasing or decreasing the protruding dimension of the protruding portion into the second space, the cross-sectional area (inner diameter) of the second space can be increased or decreased while fixing the position and shape of the partition wall. Therefore, it is possible to form a second space that can accommodate pipes of various sizes while ensuring design freedom regarding the position and shape of the partition wall. However, when manufacturing a bushing using a mold, for example, the shape of the first space or the second space (the shape of the partition wall) may restrict the direction in which the mold can be removed from the first space or the second space. Due to this restriction, the position of the closure portion in the central axis direction may be limited depending on the position and shape of the partition wall. In some cases, it may be necessary to form the closure portion as a separate member from the main pipe and attach the closure portion to the main pipe later. However, this bushing allows for greater freedom in the design of the partition wall. Therefore, while the closure and the main pipe are integrally molded, the axial position of the closure is less likely to be restricted, and the axial position of the closure can be more freely determined. As a result, for example, the closure can be positioned at the end of the main pipe in the axial direction. This, for example, simplifies manufacturing and prevents fluid from flowing into the first space. [Effects of the Invention]

[0016] According to the present invention, the structure can be simplified and the manufacturing process can be facilitated. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a vertical cross-sectional view showing a joint structure according to an embodiment of the present invention. [Figure 2] FIG. 2 is a development view showing the component configuration of the joint structure shown in FIG. [Figure 3] FIG. 2 is a vertical cross-sectional view of a bush used in the joint structure shown in FIG. [Figure 4] FIG. 4 is a front view of the bush shown in FIG. 3. [Figure 5] 2 is a perspective view of a bush and a second ring of the joint structure shown in FIG. 1, viewed from below. FIG. [Figure 6] FIG. 10 is a vertical cross-sectional view of a bushing according to a first modified example of the present embodiment. [Figure 7] FIG. 10 is a vertical cross-sectional view of a bushing according to a second modified example of the present embodiment. [Figure 8] FIG. 10 is a front view of a bushing according to a second modified example of the embodiment. [Figure 9] FIG. 10 is a front view of a bushing according to a third modified example of the embodiment. [Figure 10] FIG. 10 is a vertical cross-sectional view of a bushing according to a fourth modified example of the present embodiment. [Figure 11] FIG. 10 is a vertical cross-sectional view of a bushing according to a fifth modified example of the present embodiment. [Figure 12] FIG. 13 is a front view of a bushing according to a sixth modified example of the embodiment. [Figure 13] FIG. 13 is a vertical cross-sectional view of the bushing shown in FIG. [Figure 14] FIG. 13 is a vertical cross-sectional view of a bushing according to a seventh modified example of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, a joint part (joint structure) 1 according to one embodiment of the present invention will be described with reference to the drawings. The joint part 1 is used, for example, for building drainage, and is disposed in a slab penetration hole formed in a floor slab. As shown in FIGS. 1 and 2, the joint portion 1 according to this embodiment includes a multi-joint 10. As shown in FIG.

[0019] The manifold 10 includes an upper connecting pipe 11, a lower connecting pipe 12, and an intermediate pipe 15 that connects the upper connecting pipe 11 and the lower connecting pipe 12. The upper connecting pipe 11 has a vertical pipe connecting portion 13 that can be connected to a first vertical pipe P1, and a horizontal pipe connecting portion 14 that protrudes from the side of the vertical pipe connecting portion 13 and can be connected to a horizontal pipe P3.

[0020] The vertical pipe connecting portion 13 is formed in a tubular shape. A first vertical pipe P1 is connected to a first end (upper end) of the vertical pipe connecting portion 13, and a lower connecting pipe 12 is connected to a second end (lower end) via an intermediate pipe 15. In the illustrated example, a retaining plate 13a is protruded from the inner peripheral surface of the vertical pipe connecting portion 13 at a position that avoids the horizontal pipe connecting portion 14, but the retaining plate 13a may be omitted. In the following description, the upper connecting pipe 11 side of the vertical pipe connecting portion 13 along the central axis O of the vertical pipe connecting portion 13 is referred to as the upper side, and the lower connecting pipe 12 side is referred to as the lower side.

[0021] The horizontal pipe connecting portions 14 protrude from the outer peripheral surface of the vertical pipe connecting portion 13. In the illustrated example, three horizontal pipe connecting portions 14 are arranged at intervals around the central axis O. Two of the three horizontal pipe connecting portions 14 are arranged at positions sandwiching the central axis O. The remaining horizontal pipe connecting portions 14 extend in directions that form 90° angles around the central axis O with respect to the two horizontal pipe connecting portions 14 in a top view. Note that the number and extending direction of the horizontal pipe connecting portions 14 are not limited to this embodiment and can be changed as desired.

[0022] The upper connecting pipe 11 is obtained, for example, by injecting and filling a polyvinyl chloride resin composition containing 0.1 to 1.0 parts by weight of non-expandable graphite with respect to 100 parts by weight of polyvinyl chloride resin into a cavity.

[0023] The intermediate pipe 15 is connected to the lower end of the upper connecting pipe 11. In the illustrated example, the upper end of the intermediate pipe 15 is fitted into the lower end of the vertical pipe connecting part 13. The intermediate pipe 15 preferably satisfies the performance requirements specified in JIS K6741. The intermediate pipe 15 contains a resin composition containing a polyvinyl chloride resin and thermally expandable graphite, and is manufactured by, for example, extrusion molding the resin composition.

[0024] The intermediate tube 15 may have a single-layer structure in which the entire intermediate tube 15 is made of a resin composition, or may have a multi-layer structure made of multiple layers. In the case of a multi-layer structure, any one of the layers may be formed from a resin composition. For example, when the intermediate pipe 15 has a three-layer structure consisting of a surface layer, a middle layer, and an inner layer, the intermediate pipe 15 may have a configuration in which the middle layer is formed from a resin composition.

[0025] Furthermore, for example, if the intermediate pipe 15 has a three-layer structure, the surface layer, intermediate layer, and inner layer may contain a heat-absorbing agent. The intermediate layer may contain thermally expandable graphite and therefore be black in color. In this case, it is preferable that the surface layer and inner layer contain a coloring agent other than black so that they can be distinguished from the intermediate layer. If the intermediate pipe does not contain thermally expandable graphite, a sheet-like fire-resistant material containing thermally expandable graphite may be wrapped around the outer surface of the intermediate pipe 15 or the outer surface of a sound-insulating material covering the intermediate pipe 15, as described below, and the fire-resistant material may be embedded in the slab penetration portion.

[0026] The lower connecting pipe 12 is tubular and has a smaller diameter at the bottom than at the top. The lower connecting pipe 12 includes a connecting pipe section 16 connected to the intermediate pipe 15, an inclined pipe section 17 extending downward from the connecting pipe section 16 and gradually decreasing in diameter as it extends downward, and a lower pipe section 18 provided at the lower end of the inclined pipe section 17 and to which the second vertical pipe P2 is connected. The intermediate pipe 15 is fitted into the connecting pipe section 16. The second vertical pipe P2 is fitted into the lower pipe section 18. The connecting pipe section 16, inclined pipe section 17, and lower pipe section 18 are integrally formed by, for example, injection molding of a synthetic resin material.

[0027] The upper connecting pipe 11 and the lower connecting pipe 12 may be made transparent, which allows the connection state of the upper connecting pipe 11 and the lower connecting pipe 12 to be visually confirmed. Furthermore, the upper connecting pipe 11 and the lower connecting pipe 12 may be compounded with a flame retardant such as non-thermally expandable graphite or magnesium hydroxide.

[0028] A first bushing 21, a first packing 22, and a first ring 23 are provided at the upper end of the upper connecting pipe 11 (the upper end of the vertical pipe connecting portion 13). The first bushing 21 includes a fitting portion 21a, a support portion 21c, and a swirl vane 21b. The fitting portion 21a is formed in a tubular shape that fits into the vertical pipe connection portion 13. The support portion 21c extends downward from the fitting portion 21a. The swirl vane 21b is provided at the lower end of the support portion 21c. The swirl vane 21b extends around the central axis O.

[0029] The first packing 22 is fitted into the first bushing 21. The upper end of the first packing 22 is provided with a lip portion 22a that comes into close contact with the outer peripheral surface of the first vertical pipe P1. The lower end of the first packing 22 is formed with an upward-facing step portion 22b. The end of the first vertical pipe P1 abuts against this step portion 22b.

[0030] The first ring 23 is fitted from the outside onto the upper end of the first bushing 21. A flange portion 23a is provided on the upper end of the first ring 23. The flange portion 23a prevents the first packing 22 from coming off the first bushing 21. The first bushing 21, the first packing 22 and the first ring 23 can be pre-assembled and integrated before being attached (bonded) to the upper connecting pipe 11.

[0031] The first packing 22 and a second packing 32 (described later) are made of a rubber material that is generally used in drainage facilities, such as ethylene-propylene-diene rubber (EPDM). The first bushing 21, the first ring 23, and the second bushing 31 and the second ring 33 described below are each obtained by injection molding a polyvinyl chloride resin composition containing 0.1 to 1.0 parts by weight of non-expandable graphite per 100 parts by weight of polyvinyl chloride resin. The first bushing 21 and the second bushing 31 may be made transparent.

[0032] A second bushing 31, a second packing 32, and a second ring 33 are provided at the tip of the horizontal pipe connection portion 14. The second bushing 31 is bonded to the horizontal pipe connecting portion 14 while being fitted into the horizontal pipe connecting portion 14. The tip of the second bushing 31 protrudes from the horizontal pipe connecting portion 14.

[0033] The second packing 32 is fitted into the second bushing 31 and is in close contact with the outer peripheral surface of the horizontal pipe P3. The second ring 33 is fitted onto the tip end of the second bushing 31 from the outside. The second ring 33 is provided with a flange portion 33a. The flange portion 33a prevents the second packing 32 from coming off the second bushing 31.

[0034] At least one horizontal pipe connecting portion (pipe connecting portion) 14A among the plurality of horizontal pipe connecting portions 14 uses a bush 50 as the second bush 31, as will be described below. As shown in FIGS. 3 and 4, the bushing 50 includes a main pipe 51, a partition wall 52, a closing portion 53, and a protruding portion 55.

[0035] The main body pipe 51 has a circular tubular shape. A first end 51a of the main body pipe 51 is fitted into the horizontal pipe connecting portion 14A. A second end 51b of the main body pipe 51 protrudes to the outside from the horizontal pipe connecting portion 14A. Hereinafter, the side of the first end 51a along the central axis C1 of the main body pipe 51 will be referred to as the first side D1, and the side of the second end 51b along the central axis C1 of the main body pipe 51 will be referred to as the second side D2.

[0036] The partition wall 52 is provided inside the main body pipe 51. The partition wall 52 divides the inside of the main body pipe 51 into a first space S1 and a second space S2 in a cross section intersecting with the central axis C1. 4, the partition wall 52 is formed in an arc shape with a center of curvature at the central axis C2 in a front view seen from the direction of the central axis C1. The central axis C2 is parallel to the central axis C1 and offset from the central axis C1. The radius of curvature r2 of the partition wall 52 with the central axis C2 as the center of curvature is smaller than the radius of curvature r1 of the main pipe 51 with the central axis C1 as the center of curvature.

[0037] 3, the partition wall 52 extends continuously in the direction of the central axis C1. The partition wall 52 has a constant thickness T in a direction intersecting the central axis C2 in a region of a predetermined length from the first end 51a to the second end 51b of the main tube 51. Hereinafter, a portion of the surface of the partition wall 52 that faces the direction in which the partition wall 52 curves and protrudes will be referred to as a first surface 52f of the partition wall 52. A portion of the surface of the partition wall 52 that is located on the opposite side of the partition wall 52 from the first surface 52f, with the partition wall 52 sandwiched therebetween, will be referred to as a second surface 52g. The first surface 52f forms a first space S1, and the second surface 52g forms a second space S2.

[0038] 4, the first space S1 is formed between a first surface 52f of the partition wall 52 and an inner circumferential surface 51f of the main body tube 51 facing the first surface 52f. The first space S1 has a crescent shape in a cross section intersecting with the central axis C1. The second space S2 is formed between the second surface 52g of the partition wall 52 and the inner circumferential surface 51g of the main body pipe 51 facing the second surface 52g. The second space S2 has a substantially circular cross section perpendicular to the central axis C1. The central axis C2 is the central axis of the second space S2.

[0039] 1, a horizontal pipe P31 is inserted into the second space S2. The second packing 32 described above is disposed within the end of the second side D2 of the second space S2. In the illustrated example, the horizontal pipe P31 inserted into the second space S2 has a smaller diameter than the horizontal pipe P3 connected to the other horizontal pipe connecting portion 14.

[0040] 3, the blocking portion 53 blocks the first space S1. The blocking portion 53 is provided integrally with the main pipe 51 at the first end 51a of the main pipe 51. The blocking portion 53 is also provided integrally with the first end 52a of the partition wall 52. The blocking portion 53 is formed in a plate shape facing the central axis C1 (in the illustrated example, a plate shape perpendicular to the central axis C1). The outer peripheral edge of the blocking portion 53 is connected to the first surface 52f of the partition wall 52 and the inner peripheral surface 51f of the main pipe 51.

[0041] 4, a reinforcing rib 56 is provided in the first space S1, connecting the first surface 52f of the partition wall 52 and the inner circumferential surface 51f of the main tube 51. A plurality of reinforcing ribs 56 (three in the illustrated example) are provided at intervals in the circumferential direction around the central axis C2. A first end of the reinforcing rib 56, located on the first side D1 in the direction of the central axis C1, is connected to the blocking portion 53.

[0042] 3, a protruding wall 54 that protrudes toward the second space S2 is provided at a first end 52a of the partition wall 52 that is located on the first side D1 in the direction of the central axis C1. The protruding wall 54 is located on the opposite side of the blocking portion 53 across the partition wall 52. The tip of the horizontal pipe P31 that is inserted into the second space S2 abuts against the protruding wall 54.

[0043] The protruding portion 55 protrudes from the second surface 52g of the partition wall 52 into the second space S2. The protruding portion 55 has a plurality of protrusions 55A. A plurality of protrusions 55A (three in the illustrated example) are provided at intervals in the circumferential direction. Each protrusion 55A is not formed over the entire length of the main tube 51 in the direction of the central axis C1, but is formed only on a portion of the main tube 51 in the direction of the central axis C1. In the illustrated example, the protrusion 55A is formed so as to be eccentric to the first side D1 of the main tube 51. The protrusion 55A extends continuously from the protruding wall 54 in the direction of the central axis C1.

[0044] Of the protrusion 55A, the tip 55s located on the second side D2 has a protruding height (overhanging height) from the second surface 52g of the partition wall 52 that gradually decreases from the first side D1 to the second side D2. The end face of the tip 55s is inclined with respect to the central axis C2 in a vertical cross section including the central axis C2. As a result, when the horizontal pipe P31 is inserted into the second space S2, the horizontal pipe P31 is guided toward the central axis C2 by the protrusion 55A (overhanging portion 55).

[0045] As shown in Fig. 3, the second end 51b of the main body tube 51 is an expanded diameter section 59. The expanded diameter section 59 has a larger diameter than a portion of the main body tube 51 that is located closer to the first side D1 than the expanded diameter section 59. As shown in Fig. 4, a flat surface 60 is formed on a portion of the expanded diameter section 59 that faces the partition wall 52 across the central axis C2.

[0046] 5, flat surface 60 is formed by cutting out a portion of the outer peripheral surface of expanded diameter portion 59 (main tube 51). Flat surface 60 is formed by making a portion of main tube 51 around central axis C1 thinner than the other portions. Note that flat surface 60 is not limited to a structure formed by actually cutting out a portion of main tube 51, and may be formed by designing a mold so that flat surface 60 is formed during injection molding.

[0047] Convex portions 57 and 58 are formed on the outer circumferential surface of main body pipe 51. Convex portions 57 and 58 are located closer to first side D1 than expanded diameter portion 59. The protrusion 57 engages with a recess (not shown) formed in the horizontal pipe connecting portion 14A. By engaging with the recess, the protrusion 57 determines the position of the bushing 50 around the central axis C1 relative to the horizontal pipe connecting portion 14A. The protrusion 58 engages with a recess 73 of the eccentric ring 70, which will be described later. The protrusion 58, by engaging with the recess, determines the position of the eccentric ring 70 relative to the bush 50 around the central axis C1.

[0048] As shown in FIGS. 1 and 5, the bush 50 uses an eccentric ring 70 as the second ring 33, as will be described below. The eccentric ring 70 integrally includes a main ring 72 and an eccentric flange 71 . The second end 51b of the main body tube 51 is inserted into the main body ring 72. A recess 73 that opens toward the first side D1 is formed in a part of the main body ring 72 in the circumferential direction.

[0049] The eccentric flange 71 is formed in an annular shape and protrudes from the inner circumferential surface at the end of the second side D2 of the main ring 72. The eccentric flange 71 abuts against the second end 51b of the main tube 51 and presses against the second packing 32. The outer circumferential surface of the eccentric flange 71 is coaxial with the central axis C1. The inner circumferential surface of the eccentric flange 71 is coaxial with the central axis C2 and is eccentric with respect to the central axis C1.

[0050] The eccentric ring 70 has a flat portion 74 formed at a position corresponding to the flat surface 60 when the eccentric ring 70 is attached to the bush 50 (when the eccentric ring 70 is positioned around the central axis C1 by the convex portion 58). The flat portion 74 is formed by cutting out a part of the main ring 72. The part of the main ring 72 where the flat portion 74 is formed is missing, and an opening 74a is formed in this part. The flat surface 60 is exposed to the outside from the flat portion 74. Note that the flat portion 74 is not limited to a structure in which it is actually formed by cutting out a part of the eccentric ring 70, and may be formed by designing a mold so that the flat portion 74 is formed during injection molding.

[0051] 1, the bushing 50 is inserted into the horizontal pipe connection portion 14A so that the first space S1 is located above and the second space S2 is located below. That is, with the bushing 50 positioned around the central axis C1 relative to the horizontal pipe connection portion 14A by the protrusion 57, the first space S1 is located above the second space S2. With the bushing 50 inserted into the horizontal pipe connection portion 14A (with the bushing 50 positioned around the central axis C1 by the protrusion 57), the flat surface 60 and the flat portion 74 are located at their lowest ends.

[0052] In the bushing 50, the horizontal pipe P31 is inserted into the second space S2 from the second side D2 in the direction of the central axis C1. Here, the protruding portion 55 is provided only on the first end portion 52a of the partition wall 52. Therefore, on the second side D2, closer to the protruding portion 55, the inner diameter (cross-sectional area) of the second space S2 is larger than the outer diameter of the horizontal pipe P31. Therefore, when starting to insert the horizontal pipe P31 into the second space S2, the horizontal pipe P31 can be easily inserted into the bushing 50.

[0053] When the horizontal pipe P31 is inserted into the second space S2 toward the first side D1 and reaches the tip 55s of the protrusion 55A, the tip of the horizontal pipe P31 is guided by the inclined tip 55s between the multiple protrusions 55A and the inner circumferential surface 51g of the main pipe 51. When the tip of the horizontal pipe P31 hits the protruding wall 54, the horizontal pipe P31 is sandwiched and held between the multiple protrusions 55A (extending portions 55) and the inner circumferential surface 51g of the main pipe 51.

[0054] Here, the second space S2 is offset downward with respect to the central axis C2 of the horizontal pipe connection portion 14A. Therefore, the position of the horizontal pipe P31 can be lowered to a position close to the floor slab S. This makes it easier to ensure, for example, a water gradient in the horizontal pipe P31. Furthermore, the eccentric ring 70 and the bushing 50 are formed with a flat portion 74 and a flat surface 60. This allows the eccentric ring 70 and the bushing 50 to be lowered to a position close to the floor slab S. This makes it easier to ensure a water gradient in the horizontal pipe P31, for example.

[0055] As described above, the bushing 50 according to this embodiment is disposed between the horizontal pipe connecting portion 14A of the collecting joint 10 and the horizontal pipe P31, which have different diameters, and connects them after adjusting the difference in diameter between them. The horizontal pipe connecting portion 14A of the collecting joint 10 can be connected to the horizontal pipe P31 by inserting the main pipe 51 into the horizontal pipe connecting portion 14A and inserting the horizontal pipe P31, which has a smaller diameter than the horizontal pipe connecting portion 14A, into the second space S2.

[0056] The protruding portion 55 protrudes into the second space S2. Therefore, by increasing or decreasing the protruding dimension of the protruding portion 55 into the second space S2, it is possible to increase or decrease the cross-sectional area (inner diameter) of the second space S2 while fixing the position and shape of the partition wall 52. Therefore, it is possible to form the second space S2 to accommodate horizontal pipes P31 of various sizes while ensuring design freedom for the position and shape of the partition wall 52.

[0057] Incidentally, for example, when manufacturing bushing 50 using a mold, there is a risk that restrictions will arise in the direction in which the mold can be removed from first space S1 or second space S2 depending on the shapes of first space S1 or second space S2 (the shapes of partition walls 52). Due to these restrictions, the position of closure portion 53 in the direction of central axis C1 will be limited depending on the position and shape of partition walls 52. In some cases, it may be necessary to form closure portion 53 as a separate member from main pipe 51 and attach closure portion 53 to main pipe 51 later.

[0058] However, this bushing 50 allows for greater freedom in the design of the partition wall 52. Therefore, while the blocking portion 53 and the main pipe 51 are integrally molded, the position of the blocking portion 53 in the direction of the central axis C1 is less likely to be restricted, and the degree of freedom in the position of the blocking portion 53 in the direction of the central axis C1 can be increased. As a result, the blocking portion 53 can be disposed at the end of the main pipe 51 in the direction of the central axis C1. This, for example, can simplify manufacturing and restrict the inflow of fluid from outside into the first space S1.

[0059] The blocking portion 53 is provided at the first end 51a of the main body pipe 51. Therefore, it is possible to prevent the fluid from flowing into the first space S1 from the first side D1.

[0060] The overhanging portion 55 has a plurality of protrusions 55A. Therefore, the overhanging portion 55 can be formed by increasing the thickness of the portion of the partition wall 52 where the overhanging portion 55 is provided only in the portion corresponding to the protrusions 55A. Therefore, the portion of the partition wall 52 that is to be thickened can be limited to a narrow range. When the bushing 50 is injection molded using a resin or rubber material, sink marks in the material tend to occur in thick portions, which can lead to poor quality. However, by partially providing the protruding portions 55 (protrusions 55A) while maintaining the thickness of the partition wall 52, for example, it is possible to prevent sink marks and the like from occurring during molding. As a result, the bushing 50 can be manufactured more easily.

[0061] The protruding portion 55 is provided only on a portion of the main pipe 51 in the direction of the central axis C1. Therefore, when the end of the horizontal pipe P31 is inserted into the second space S2, excessive frictional resistance generated at the contact portion between the horizontal pipe P31 and the protruding portion 55 can be prevented. This makes it easy to connect the horizontal pipe P31 to the second space S2.

[0062] (First Modification of the Embodiment) In the above embodiment, only the tip 55s of the protrusion 55A in the direction of the central axis C2 is inclined, and the protrusion dimension of the protrusion 55A from the second surface 52g of the partition wall 52 in other parts is made constant, but the present invention is not limited to this. As shown in Figure 6, the protrusion 55B constituting the protrusion portion 55 of the bushing 50B of this modified example may be formed so that the protrusion dimension from the second surface 52g of the partition wall 52 gradually increases along the direction of the central axis C2 from the second side D2 of the main tube 51 toward the first side D1.

[0063] (Second Modification of the Embodiment) In the above embodiment, the reinforcing ribs 56 are provided on the opposite sides of the partition wall 52 from the plurality of protrusions 55A, but the present invention is not limited to this. 7 and 8, for example, in bushing 50C of this modified example, the inner diameter of second space S2 is larger than that of bushing 50 shown in the above embodiment. A protrusion 55C is provided on circumferential end 52e of partition wall 52C (the portion where partition wall 52C joins with main pipe 51).

[0064] (Third Modification of the Embodiment) Furthermore, in the above embodiment, the bushing 50 is provided with three protrusions 55A, but the number of protrusions is not limited in any way. For example, like a bushing 50D of this modified example shown in FIG. 9, two protrusions 55D may be provided spaced apart in the circumferential direction.

[0065] (Fourth Modification of the Embodiment) In addition, in the above embodiment, the blocking portion 53 is provided integrally with the main body tube 51 at the first end 51a of the main body tube 51, but the present invention is not limited to this. 10 , the upper end of the blocking portion 53 may be provided in the center of the main body pipe 51 in the direction of the central axis C1. In this bushing 50E, the blocking portion 53 extends downward to the first side D1 and is inclined with respect to the direction of the central axis C1. The lower end of the blocking portion 53 is connected to the first end 52a of the partition wall 52. Because the blocking portion 53 is inclined as described above, even if sewage or the like enters the first space S1 from the first side D1, the sewage will not remain in the first space S1 but will be discharged from the first space S1 to the first side D1. In this modification, the blocking portion 53 does not protrude outward along the central axis C1 direction from the main pipe 51 or the partition wall 52. Therefore, even if the blocking portion 53 is inclined as described above, the size of the bushing 50E can be reduced.

[0066] (Fifth Modification of the Embodiment) Furthermore, for example, like a bushing 50F of this modified example shown in FIG. 11, the blocking portion 53 may extend downward to the second side D2.

[0067] (Sixth Modification of the Embodiment) In the above embodiment, the protruding portion 55 is provided with a plurality of protrusions 55A, but the present invention is not limited to this. For example, as in a bushing 50G of this modified example shown in Figures 12 and 13, the protruding portion 55 may be formed by a single protrusion 55G. The circumferential size of the protrusion 55G is smaller than the circumferential size of the above-mentioned protrusion 55A, and is, for example, about half the circumferential size of the entire partition wall 52.

[0068] (Seventh Modification of the Embodiment) Furthermore, for example, as in a bushing 50H of this modified example shown in FIG. 14 , a lightening portion S3 may be formed in the partition wall 52. The lightening portion S3 is provided in a circumferential portion of the partition wall 52 where the protrusion 55G (protruding portion 55) is provided. The lightening portion S3 opens toward the first side D1 in the direction of the central axis C1. In the lightening portion S3, the radial size, which is a direction perpendicular to the central axis C2, of the lightening portion S3 gradually increases toward the first side D1. In other words, in this modified example, the partition wall 52 is divided into two portions in the radial direction from the center portion in the direction of the central axis C1 toward the first side D1. Of the two divided portions of the partition wall 52, the outer portion located on the radially outer side forms the first space S1, and the inner portion located on the radially inner side forms the second space S2. The inner portion protrudes radially inward compared to the other circumferential portion that forms the second space S2.

[0069] (Eighth Modification of the Embodiment) The upper connecting pipe 11 and the lower connecting pipe 12 may be fitted with sound insulating covers (not shown) that cover the outer circumferential surfaces of each pipe.

[0070] For example, a sheet (not shown) may be wrapped around the upper connecting pipe 11 as a sound-insulating cover. Such a sheet may be made of an elastic material such as modified asphalt, elastomer, rubber, polyolefin resin, soft vinyl chloride resin, etc. The sheet may contain an inorganic material such as calcium carbonate or barium sulfate, a metal sheet such as iron or lead, or metal powder.

[0071] Furthermore, for example, a pipe body made of a sound-insulating material may be provided as a sound-insulating cover (not shown) on the lower connecting pipe 12. The sheet body is integrally molded by, for example, injection molding, pressure molding, blow molding, vacuum forming, etc. The sheet body is formed from an elastic resin material such as an olefin-based material (a resin composition containing 300 to 600 parts by weight of inorganic filler per 100 parts by weight of olefin-based resin).

[0072] The inorganic filler is not particularly limited, but examples thereof include silica, diatomaceous earth, alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, ferrites, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, basic magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, barium carbonate, dawnnite, hydrotalcite, calcium sulfate, barium sulfate, gypsum fiber, calcium silicate, talc, clay, mica, montmorillonite, bentonite, activated clay, sepiolite, imogolite, sericite, glass fiber, glass beads, silica-based balun, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balun, charcoal powder, various metal powders, potassium titanate, magnesium sulfate, lead zirconate titanate, aluminum borate, molybdenum sulfide, silicon carbide, stainless steel fiber, zinc borate, various magnetic powders, slag fiber, fly ash, and dewatered sludge. Of these, calcium carbonate is preferably used as the inorganic filler in view of the balance between weight and cost. These may be used alone or in combination of two or more.

[0073] The olefin resin is not particularly limited, but examples thereof include low-density polyethylene, high-density polyethylene, linear low-density polyethylene, atactic polypropylene, isotactic polypropylene, syndiotactic polypropylene, and poly-α-olefin. 3 The olefin resin is preferably polyethylene having a density of 0.87 g / cm. 3 If the density is less than 0.93 g / cm, the strength of the tube is insufficient. 3 If the bending modulus of elasticity of the olefin resin is more than 100 to 3000 kg / cm, the tubular body may buckle when flattened (when an axial force is applied to the tubular body). 2The strength and winding processability are sufficient if the tubular body is made of a material other than an olefin-based material, such as polyvinyl chloride resin, polystyrene resin, ABS resin, AS resin, or elastomer material.

[0074] The technical scope of the present invention is not limited to the above-described embodiment and its modifications, and various modifications can be made without departing from the spirit of the present invention.

[0075] The protruding portion 55 is provided only at the first end portion 52a of the partition wall 52. However, for example, it may be provided only at the center portion along the central axis C1 direction of the partition wall 52. For example, it may be provided over the entire length of the partition wall 52. The flat surface 60 and the flat portion 74 may be omitted.

[0076] The bushing 50 may be provided at other pipe connections such as the vertical pipe connection 13 . The bushing 50 may be provided at a plurality of horizontal pipe connection portions 14 .

[0077] In addition, within the scope of the spirit of the present invention, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described modifications may be combined as appropriate. [Explanation of symbols]

[0078] 1 Joint section (joint structure) 10. Collective joint 14A Horizontal pipe connection (pipe connection) 50A, 50B, 50C, 50D, 50E, 50F, 50G, 50H Bush 51 Main tube 52, 52C partition wall 55 overhang 55A, 55B, 55C, 55D, 55G protrusion C1 center axis P31 Horizontal tube (body) S1 1st space S2 2nd space

Claims

1. A joint assembly having an upper connecting pipe and a lower connecting pipe, the upper connecting pipe includes a horizontal pipe connecting portion and a bushing connected to the horizontal pipe connecting portion; The bushing has a main pipe, a partition wall, a closing portion, a packing, and an eccentric ring, the main body pipe has a first end portion fitted to the horizontal pipe connecting portion and a second end portion protruding from the horizontal pipe connecting portion, the partition wall is provided within the main body pipe and partitions the inside of the main body pipe into a first space and a second space in a cross section intersecting a central axis of the main body pipe, the closing portion closes the first space, The packing is disposed within an end of the second space, the eccentric ring is fitted to an end of the first space and the second end of the main tube; Collective joint.

2. The bushing includes a protruding portion provided on the partition wall, The main body pipe, the partition wall, the closing portion, and the protruding portion are integrally molded. The assembly joint according to claim 1 .

3. The joint according to claim 2 , wherein a protrusion is provided at an end of the overhanging portion.

4. 4. The joint according to claim 1, wherein an outer surface of the main pipe is provided with a step that abuts against an end face of the horizontal pipe connecting portion.

5. 5. The joint according to claim 1, wherein the second end of the main pipe is an expanded diameter portion.

6. The joint assembly according to claim 1 , wherein the blocking portion is formed in a plate shape perpendicular to the central axis of the main pipe.

7. The eccentric ring includes a main ring and an eccentric flange, the body ring is inserted into the second end of the body tube; The joint according to claim 1 , wherein the second end of the main pipe abuts against the eccentric flange.

8. The eccentric ring includes a main ring and an eccentric flange, The second end of the body tube is inserted into the body ring, The group joint according to claim 1 , wherein the eccentric flange presses the packing.

9. A joint structure comprising: a first vertical pipe; a second vertical pipe; a manifold according to any one of claims 1 to 8 that connects the first vertical pipe and the second vertical pipe; and a horizontal pipe connected to the manifold.

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