JP7206076B2 - Joint structure - Google Patents

Description

The present invention relates to bushings, bushing structures, and joint structures.

Conventionally, a collective joint as described in, for example, Patent Document 1 below has been known.

JP-A-2011-6893

By the way, it is desirable for this type of collective joint to make effective use of the underfloor space.

SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances described above, and an object of the present invention is to effectively utilize the underfloor space.

In order to solve the above problems, the present invention proposes the following means.
A bushing according to the present invention is a tubular bushing comprising: a first outer peripheral surface formed by a curved surface having a first curvature; A second outer peripheral surface provided on another part and formed by a flat surface or a curved surface having a second curvature smaller than the first curvature.
Here, each of the first curvature and the second curvature is the curvature (reciprocal of the radius of curvature) of an arc formed by each curved surface in a front view of the bush when viewed from the central axis direction.

The second outer peripheral surface is formed by a flat surface or a curved surface having a second curvature. For example, when the bush is arranged at the horizontal pipe connecting portion in a state where the second outer peripheral surface is located below the first outer peripheral surface, the central axis of the bush can be brought closer to the floor slab. As a result, it is possible to effectively utilize the space under the floor.

The second outer peripheral surface may be a flat surface.
The second outer peripheral surface may be smaller in the circumferential direction than the first outer peripheral surface.

In these cases, the space under the floor can be used more effectively.

A partition wall is provided in the bush and divides the inside of the bush into a first space and a second space in a cross section that intersects the central axis of the bush, and the second outer peripheral surface defines the second space. It may be provided on the opposite side of the first space on both sides.

A second outer peripheral surface is provided on the opposite side of the first space across the second space. Therefore, for example, when the bush is arranged at the horizontal pipe connecting portion in a state where the second outer peripheral surface is located below the first outer peripheral surface, the second space is located below the first space. Therefore, it is possible to easily secure the water gradient of the horizontal pipe connecting to the second space.

The bushing structure according to the present invention includes the bushing and a ring member arranged outside the maximum outer shape portion, and the ring member has a flat portion having an opening for exposing the second outer peripheral surface to the outside. is formed.

A flat portion is formed in the ring member. Therefore, even when the ring member is arranged outside the bush, the second outer peripheral surface can be reliably brought close to the floor slab by exposing the second outer peripheral surface to the outside through the opening of the flat portion. As a result, it is possible to effectively utilize the space under the floor.

A joint structure according to the present invention includes a collective joint including a horizontal pipe connection portion, and the above-mentioned joint provided at the horizontal pipe connection portion in a state in which the second outer peripheral surface is positioned below the first outer peripheral surface. a bushing;

The second outer peripheral surface is formed by a flat surface or a curved surface having a second curvature. If the bush is arranged at the horizontal pipe connecting portion in a state where the second outer peripheral surface is located below the first outer peripheral surface, the central axis of the bush can be arranged closer to the floor slab. As a result, it is possible to effectively utilize the space under the floor.

According to the present invention, it is possible to effectively utilize the underfloor space.

It is a longitudinal section showing a joint structure concerning one embodiment of the present invention. FIG. 2 is an exploded view showing the component configuration of the joint structure shown in FIG. 1; FIG. 2 is a vertical cross-sectional view of a bush used in the joint structure shown in FIG. 1; 4 is a front view of the bush shown in FIG. 3; FIG. 2 is a perspective view of the bush and second ring of the joint structure shown in FIG. 1 as viewed from below; FIG. 6 is a front view of the second ring shown in FIG. 5; FIG.

A joint portion (joint structure) 1 according to an embodiment of the present invention will be described below with reference to the drawings. The joint part 1 is used, for example, for building drainage, and is arranged in a slab through-hole formed in a floor slab.
As shown in FIGS. 1 and 2, the joint portion 1 according to this embodiment includes a collective joint 10. As shown in FIGS.

The collective joint 10 includes an upper connection pipe 11 , a lower connection pipe 12 , and an intermediate pipe 15 connecting the upper connection pipe 11 and the lower connection pipe 12 . The upper connection pipe 11 includes a vertical pipe connection portion 13 connectable to the first vertical pipe P1, and a horizontal pipe connection portion 14 projecting from the side surface of the vertical pipe connection portion 13 and connectable to the horizontal pipe P3. have.

The vertical pipe connection 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) thereof via an intermediate pipe 15. be done. In the illustrated example, the damming plate 13a is protruded at a position avoiding the horizontal pipe connecting portion 14 on the inner peripheral surface of the vertical pipe connecting portion 13, but the damming 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.

The horizontal pipe connection portion 14 protrudes from the outer peripheral surface of the vertical pipe connection portion 13 . In the illustrated example, three horizontal pipe connecting portions 14 are arranged around the central axis O at intervals. Two of the three horizontal pipe connecting portions 14 are separately arranged at positions sandwiching the central axis O therebetween. The remaining horizontal pipe connection portions 14 extend in a direction forming 90° around the central axis O with respect to each of the two horizontal pipe connection portions 14 when viewed from above. In addition, the quantity and extending direction of the horizontal pipe connecting portions 14 are not limited to such an aspect, and can be arbitrarily changed.

For the upper connection pipe 11, for example, a polyvinyl chloride resin composition containing 0.1 to 1.0 parts by weight of non-expanding graphite with respect to 100 parts by weight of polyvinyl chloride resin is injected into the cavity. Obtained with filling.

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 connection portion 13 . The intermediate pipe 15 preferably satisfies the performance described in JIS K6741.
The intermediate pipe 15 contains a resin composition containing polyvinyl chloride resin and thermally expandable graphite. The intermediate pipe 15 is manufactured, for example, by extruding a resin composition.

The intermediate pipe 15 may have a single-layer structure in which the entire intermediate pipe 15 is made of a resin composition, or may have a multi-layer structure in which a plurality of layers are formed. In the case of a multilayer structure, a configuration in which any layer is formed from a resin composition can be adopted.
For example, when the intermediate pipe 15 has a three-layer structure consisting of a surface layer, an intermediate layer and an inner layer, the intermediate pipe 15 may have a structure in which the intermediate layer is made of a resin composition.

Further, for example, when the intermediate tube 15 has a three-layer structure, the surface layer, intermediate layer, and inner layer may contain a heat-absorbing agent. Since the intermediate layer contains thermally expandable graphite, it can adopt a configuration exhibiting a black color. In this case, it is preferable that the surface layer and the inner layer contain a coloring agent other than black so as to be distinguishable from the intermediate layer. When the intermediate tube does not contain thermally expandable graphite, a sheet-like refractory material containing thermally expandable graphite is wrapped around the outer surface of the intermediate tube 15 or the outer surface of a sound insulating material covering the intermediate tube 15, which will be described later. Alternatively, the refractory material may be embedded in the slab penetration.

The lower connection pipe 12 has a tubular shape with a smaller diameter at the bottom than at the top. The lower connecting pipe 12 includes a connecting pipe portion 16 connected to the intermediate pipe 15, an inclined pipe portion 17 extending downward from the connecting pipe portion 16 and gradually decreasing in diameter as it goes downward, and a lower end portion of the inclined pipe portion 17. and a lower pipe portion 18 to which the second vertical pipe P2 is connected. The intermediate pipe 15 is fitted in the connecting pipe portion 16 . A second vertical pipe P<b>2 is fitted in the lower pipe portion 18 . The connecting pipe portion 16, the inclined pipe portion 17 and the lower pipe portion 18 are integrally formed by, for example, injection molding of a synthetic resin material.

In addition, the upper connection pipe 11 and the lower connection pipe 12 may be made transparent. Thereby, the connection state of the upper connection pipe 11 and the lower connection pipe 12 can be visually confirmed. Further, the upper connecting pipe 11 and the lower connecting pipe 12 may be blended with a flame retardant such as non-thermally expandable graphite or magnesium hydroxide.

A first bushing 21 , a first packing 22 , and a first ring 23 are provided at the upper end portion of the upper connection pipe 11 (the upper end portion of the vertical pipe connection portion 13 ).
The first bushing 21 includes a fitting portion 21a, a support portion 21c, and a swirl vane 21b. The fitting portion 21 a is formed in a tubular shape that fits inside 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 center axis O. As shown in FIG.

The first packing 22 is fitted inside the first bushing 21 . The upper end portion of the first packing 22 is provided with a lip portion 22a that is in close contact with the outer peripheral surface of the first vertical pipe P1. A step portion 22b facing upward is formed at the lower end portion of the first packing 22 . The end of the first vertical pipe P1 abuts against the stepped portion 22b.

The first ring 23 is fitted to the upper end of the first bushing 21 from the outside. An upper end portion of the first ring 23 is provided with a flange portion 23a. The flange portion 23 a restricts the separation of the first packing 22 from 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 assembled (bonded) to the upper connecting pipe 11 .

The first packing 22 and a second packing 32, which will be described later, are made of a rubber material generally used for 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 which will be described later, for example, contain 0.1 to 1 part of non-expandable graphite with respect to 100 parts by weight of the polyvinyl chloride resin. It is obtained by injection molding a polyvinyl chloride resin composition containing 0.0 part by weight. Note that the first bushing 21 and the second bushing 31 may be made transparent.

A second bushing 31 , a second packing 32 , and a second ring 33 are provided at the distal end portion of the horizontal pipe connecting portion 14 .
The second bushing 31 is adhered to the horizontal pipe connecting portion 14 while being fitted in the horizontal pipe connecting portion 14 . A distal end portion of the second bushing 31 protrudes from the horizontal pipe connecting portion 14 .

The second packing 32 is fitted into the second bushing 31 and adheres tightly to the outer peripheral surface of the horizontal pipe P3.
The second ring 33 is fitted to the tip of the second bushing 31 from the outside. The second ring 33 is provided with a flange portion 33a. The flange portion 33 a restricts the second packing 32 from separating from the second bushing 31 .

A bushing 50 as described below is used as the second bushing 31 for at least one horizontal pipe connection portion (pipe connection portion) 14A among the plurality of horizontal pipe connection portions 14 .
As shown in FIGS. 3 and 4, the bush 50 includes a main tube 51, a partition wall 52, and a closing portion 53. As shown in FIGS.

The main tube 51 has a circular tubular shape. A first end portion 51a of the main tube 51 is fitted to the horizontal tube connection portion 14A. A second end portion 51b of the main tube 51 protrudes outside from the horizontal tube connection portion 14A. Below, along the central axis C1 direction of the main tube 51, the first end portion 51a side is referred to as a first side D1, and the second end portion 51b side is referred to as a second side D2.

A partition wall 52 is provided within the main tube 51 . The partition wall 52 partitions the interior of the main tube 51 into a first space S1 and a second space S2 in a cross section intersecting the central axis C1.
As shown in FIG. 4, the partition wall 52 is formed in an arc shape with the central axis C2 as the center of curvature 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 with respect to the central axis C1. A curvature radius r2 of the partition wall 52 centered on the central axis C2 is smaller than a curvature radius r1 of the main tube 51 centered on the central axis C1.

Below, a portion of the surface of the partition wall 52 that faces the direction in which the partition wall 52 curves and protrudes is referred to as a first surface 52f of the partition wall 52 . A portion of the surface of the partition wall 52 located on the opposite side of the first surface 52f with the partition wall 52 interposed therebetween is referred to as a second surface 52g. The first surface 52f forms the first space S1, and the second surface 52g forms the second space S2.

The first space S1 is formed between the first surface 52f of the partition wall 52 and the inner peripheral surface 51f of the main tube 51 facing the first surface 52f. The first space S1 has a crescent shape in a cross section that intersects the central axis C1.
The second space S2 is formed between the second surface 52g of the partition wall 52 and the inner peripheral surface 51g of the main tube 51 facing the second surface 52g. The second space S2 has a substantially circular shape in a cross section orthogonal to the central axis C1. The central axis C2 is the central axis of the second space S2.

As shown in FIG. 1, a horizontal pipe P31 is inserted into the second space S2. The second packing 32 described above is arranged in the end of the second space S2 on the second side D2. Note that, 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 .

As shown in FIG. 3, the blocking part 53 blocks the first space S1. The closing portion 53 is provided integrally with the main tube 51 at the central portion of the main tube 51 in the direction of the central axis C<b>1 . The closing portion 53 is formed in a plate shape facing the direction of the central axis C1. The outer peripheral edge of the closing portion 53 is connected to the first surface 52 f of the partition wall 52 and the inner peripheral surface 51 f of the main tube 51 .

As shown in FIG. 4, reinforcing ribs 56 connecting the first surface 52f of the partition wall 52 and the inner peripheral surface 51f of the main tube 51 are provided in the first space S1. A plurality of reinforcing ribs 56 (three in the illustrated example) are provided at intervals around the central axis C2. As shown in FIG. 3, the reinforcing rib 56 extends from the closing portion 53 toward the second side D2.

As shown in FIG. 3, in the partition wall 52, a projecting wall 54 projecting into the second space S2 is provided at a first end portion 52a 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 closing portion 53 with the partition wall 52 interposed therebetween. The distal end of the horizontal pipe P31 inserted into the second space S2 abuts against the projecting wall 54 .

As shown in FIG. 3, the second end portion 51b of the main tube 51 is an enlarged diameter portion 59 (maximum outer shape portion). The enlarged diameter portion 59 has a larger diameter than a portion of the main tube 51 located on the first side D<b>1 with respect to the enlarged diameter portion 59 . The enlarged diameter portion 59 is a portion having the largest outer area (outer diameter) of the bush 50 (main tube 51). An annular rib 59f continuous in the circumferential direction around the central axis C1 is formed on the outer peripheral surface of the enlarged diameter portion 59. As shown in FIG.

The enlarged diameter portion 59 has a first outer peripheral surface 59a and a second outer peripheral surface 59b.
The first outer peripheral surface 59a is formed on a portion of the enlarged diameter portion 59 (annular rib 59f) in the circumferential direction. The first outer peripheral surface 59a is formed by a curved surface having a first curvature when viewed from the front in the direction of the central axis C1. The second outer peripheral surface 59b is formed on another portion (residual portion) of the enlarged diameter portion 59 (in the circumferential direction of the annular rib 59f). The curvature of the second outer peripheral surface 59b is smaller than the curvature of the first outer peripheral surface 59a in a front view viewed from the direction of the central axis C1. In the illustrated example, the second outer peripheral surface 59 b is formed by a flat surface 60 . The curvature of the peripheral surface (inner peripheral surface, outer peripheral surface) of the bush 50 is the curvature (reciprocal of the curvature radius) of the arc formed by each peripheral surface in a front view of the bush 50 viewed from the direction of the central axis C1. be.

As shown in FIG. 4, the flat surface 60 is formed in a portion of the enlarged diameter portion 59 that faces the partition wall 52 across the central axis C2. The flat surface 60 is located on the opposite side of the first space S1 with the second space S2 interposed therebetween.
The second outer peripheral surface 59b (flat surface 60) is circumferentially smaller than the first outer peripheral surface 59a. The second outer peripheral surface 59b has a size within a range of a central angle of less than 180° (less than 90° in the illustrated example) around the central axis C1. The first outer peripheral surface 59a has a size within a range of a central angle of 180° or more (270° or more in the illustrated example) around the central axis C1.

As shown in FIG. 5, the flat surface 60 is formed by cutting out a portion of the outer peripheral surface of the enlarged diameter portion 59 (main tube 51). A flat surface 60 is formed by making a part of the main tube 51 around the central axis C1 thinner than the other part. Note that the flat surface 60 is not limited to the structure in which a part of the main tube 51 is actually cut out, and may be formed after designing the mold so that the flat surface 60 is formed during injection molding.

Protrusions 57 and 58 are formed on the outer peripheral surface of the main tube 51 . The convex portions 57 and 58 are positioned closer to the first side D<b>1 than the enlarged diameter portion 59 .
The convex portion 57 engages with a concave portion (not shown) formed in the horizontal pipe connecting portion 14A. The projection 57 defines the position of the bush 50 around the central axis C1 with respect to the horizontal pipe connecting portion 14A by engaging with the recess.
The convex portion 58 engages with a concave portion 73 of an eccentric ring 70 which will be described later. The projection 58 defines the position of the eccentric ring 70 about the central axis C1 with respect to the bush 50 by engaging with the recess.

As shown in FIGS. 1, 5 and 6, the bush 50 uses an eccentric ring 70 as the second ring 33 as described below.
The eccentric ring 70 integrally has a body ring 72 and an eccentric flange 71 .
The second end 51 b of the main tube 51 is inserted into the main ring 72 . A recess 73 that opens toward the first side D1 is formed in a part of the body ring 72 in the circumferential direction.

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

The eccentric ring 70 is arranged outside the enlarged diameter portion 59 (annular rib 59 f ) of the bush 50 . The outer peripheral surface 70f of the eccentric ring 70 has a third outer peripheral surface 70a and a fourth outer peripheral surface 70b. The third outer peripheral surface 70a is formed on a portion of the eccentric ring 70 (main body ring 72) in the circumferential direction. The third outer peripheral surface 70a is formed by a curved surface having a third curvature when viewed from the front in the direction of the central axis C1. The fourth outer peripheral surface 70b is formed on another portion (residual portion) of the eccentric ring 70 (main body ring 72) in the circumferential direction. The curvature of the fourth outer peripheral surface 70b is smaller than the curvature of the third outer peripheral surface 70a when viewed from the front in the central axis C1 direction. In the illustrated example, the fourth outer peripheral surface 70 b is formed by a flat portion 74 .

The flat portion 74 (fourth outer peripheral surface 70b) is located at a position corresponding to the flat surface 60 when the eccentric ring 70 is mounted on the bush 50 (the eccentric ring 70 is positioned around the central axis C1 by the convex portion 58). formed.
The flat portion 74 is formed by cutting out a portion of the body ring 72 . A portion of the body ring 72 where the flat portion 74 is formed is missing, and an opening 74a is formed in this portion. The flat surface 60 is exposed to the outside from the flat portion 74 (opening) 74a. Note that the flat portion 74 is not limited to the structure in which a portion of the eccentric ring 70 is actually cut away, and may be formed after designing the mold so that the flat portion 74 is formed during injection molding.

As shown in FIG. 1, the bush 50 is inserted into the horizontal pipe connecting portion 14A so that the first space S1 is positioned above and the second space S2 is positioned below. That is, the first space S1 is located above the second space S2 in a state where the bush 50 is positioned around the central axis C1 with respect to the horizontal pipe connecting portion 14A by the protrusion 57 . The flat surface 60 and the flat portion 74 are positioned at the lowest end when the bush 50 is inserted into the horizontal pipe connection portion 14A (the bush 50 is positioned around the central axis C1 by the protrusion 57).

As described above, in the bush 50 according to this embodiment, the second outer peripheral surface 59b is formed by the flat surface 60. As shown in FIG. Therefore, for example, the bushing 50 is arranged on the horizontal pipe connecting portion 14A with the second outer peripheral surface 59b positioned downward with respect to the first outer peripheral surface 59a, and the second outer peripheral surface 59b is positioned on the slab surface Sf of the floor slab S. , the center axis C1 of the bush 50 can be brought closer to the floor slab S (slab surface Sf). As a result, it is possible to effectively utilize the space under the floor.

A second outer peripheral surface 59b is provided on the opposite side of the first space S1 across the second space S2. For example, if the bushing 50 is arranged in the horizontal pipe connecting portion 14A with the second outer peripheral surface 59b positioned below the first outer peripheral surface 59a, the second space S2 is positioned lower than the first space S1. . Therefore, it is possible to easily secure the water gradient of the horizontal pipe P31 connected to the second space S2.

A flat portion 74 is formed on the eccentric ring 70 . Therefore, even when the eccentric ring 70 is arranged outside the bush 50, the second outer peripheral surface 59b can be reliably attached to the floor slab S by exposing the second outer peripheral surface 59b from the opening 74a of the flat portion 74 to the outside. can be approached. As a result, it is possible to effectively utilize the space under the floor.

(Modification of embodiment)
The upper connection pipe 11 and the lower connection pipe 12 can also be fitted with a sound insulation cover (not shown) that covers the respective outer peripheral surfaces.

For example, a sheet body (not shown) may be wrapped around the upper connection pipe 11 as a sound insulation cover. Such a sheet body is formed in a sheet form from an elastic material such as modified asphalt, elastomer, rubber, polyolefin resin, soft vinyl chloride resin, or the like. The sheet body may contain an inorganic material such as calcium carbonate or barium sulfate, a metal sheet such as iron or lead, or a metal powder.

Further, for example, the lower connection pipe 12 may be provided with a tubular body made of a sound insulating material as a sound insulating cover (not shown). The sheet body is integrally molded by, for example, injection molding, pressure molding, blow molding, vacuum molding, or the like. The sheet body is formed of an elastic resin material such as an olefinic material (resin composition containing 300 to 600 parts by weight of an inorganic filler with respect to 100 parts by weight of an olefinic resin).

Examples of the inorganic filler include, but are not limited to, silica, diatomaceous earth, alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, ferrites, calcium hydroxide, and 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 balloon, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balloon, charcoal powder, various metal powders, titanium Potassium sulfate, magnesium sulfate, lead zirconate titanate, aluminum borate, molybdenum sulfide, silicon carbide, stainless steel fiber, zinc borate, various magnetic powders, slag fiber, fly ash, dewatered sludge, and the like. Among these, it is preferable to use calcium carbonate as the inorganic filler from the balance of weight and cost. In addition, these may be used alone or in combination of two or more.

Examples of the olefin-based resin include, but are not particularly limited to, low-density polyethylene, high-density polyethylene, linear low-density polyethylene, atactic polypropylene, isotactic polypropylene, syndiotactic polypropylene, and polyαolefin. Among them, polyethylene having a density of 0.87 to 0.93 g/cm ³ is preferable as the olefin resin. If the density is less than 0.87 g/cm ³ , the strength of the tubular body is not sufficient, and if it exceeds 0.93 g/cm ³ , when the tubular body is flattened (the axial force on the tubular body is (when applied), it may buckle. Further, if the bending elastic modulus of the olefin resin is 100 to 3000 kg/cm ² , strength and winding workability are sufficient.
The tubular body may be made of a material different from the olefin-based material. For example, polyvinyl chloride-based resin, polystyrene resin, ABS resin, AS resin, elastomer material, or the like may be used.

It should be noted that the technical scope of the present invention is not limited to the above-described embodiments and modifications thereof, and various modifications can be made without departing from the gist of the present invention.

The second outer peripheral surface 59 b may not be the flat surface 60 . For example, the second outer peripheral surface 59b may be formed by a curved surface having a second curvature smaller than the first curvature (curvature of the curved surface forming the first outer peripheral surface 59a).
The eccentric ring 70 and partition wall 52 may be omitted.
Bushings 50 may be provided in a plurality of lateral pipe connecting portions 14 .

In addition, it is possible to appropriately replace the constituent elements in the above-described embodiment with well-known constituent elements without departing from the spirit of the present invention, and the modifications described above may be combined as appropriate.

1 joint part (joint structure)
10 collective joint 14A horizontal pipe connecting portion 50 bushing 51 main pipe 52 partition wall 59 expanded diameter portion (maximum outer shape portion)
59a First outer peripheral surface 59b Second outer peripheral surface 60 Flat surface 70 Eccentric ring (ring member)
70f outer peripheral surface 74 flat portion P31 horizontal pipe (tubular body)
S1 First space S2 Second space

Claims (6)

a collection joint with a transverse pipe connection;
a tubular bush provided at the horizontal pipe connection ;
with
The bush is
having a first side fitted to the horizontal pipe connection portion and a second side projecting outward from the horizontal pipe connection portion;
a first outer peripheral surface formed by a curved surface having a first curvature provided at a portion of the maximum outer shape portion on the second side of the bush;
A second outer peripheral surface provided in another part of the maximum outer shape portion and formed by a flat surface or a curved surface having a second curvature smaller than the first curvature ;
with
The bushing is provided at the horizontal pipe connecting portion in a state in which the second outer peripheral surface is positioned downward with respect to the first outer peripheral surface,
The assembly joint is installed in the through hole of the floor slab, and the flat surface is provided at a position facing the upper surface of the floor slab,
joint structure. The joint structure according to claim 1, wherein the second outer peripheral surface is a flat surface. The joint structure according to claim 1 or 2, wherein the second outer peripheral surface is circumferentially smaller than the first outer peripheral surface. further comprising a partition wall provided in the bush and partitioning the inside of the bush into a first space and a second space in a cross section intersecting the central axis of the bush,
The joint structure according to any one of claims 1 to 3, wherein the second outer peripheral surface is provided on the opposite side of the first space across the second space. A joint structure according to any one of claims 1 to 4;
a ring member arranged outside the maximum outer shape,
A joint structure in which a flat portion having an opening for exposing the second outer peripheral surface to the outside is formed in the ring member. The collective joint is
a longitudinal pipe connection;
a tubular first bush provided at the vertical pipe connection;
further comprising
5. The joint structure according to any one of claims 1 to 4, wherein at least one of said bushing and said first bushing is transparent.

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