JP7637209B2 - Foot joints, piping structures, and buildings - Google Patents

Description

The present invention relates to a piping structure and a method for constructing the piping structure.

Conventionally, a piping structure including a leg joint and a support part (first support part) that connects the leg joint to a floor slab is known (see, for example, Patent Document 1). The leg joint has a vertical pipe part to which a vertical pipe is connected, a horizontal pipe part to which a horizontal pipe is connected, and a curved pipe part that connects the vertical pipe part and the horizontal pipe part.
The support section connects the horizontal pipe to the floor slab.

JP 2004-270219 A

Generally, in order to efficiently direct wastewater, etc. flowing within the piping structure downstream, a drainage gradient that slopes downward as it approaches the downstream side is formed in the horizontal pipe section of the leg joint.
However, in the piping structure disclosed in Patent Document 1, the drainage gradient by the horizontal pipe section cannot be stably ensured.

The present invention was made in consideration of these problems, and aims to provide a piping structure and a construction method for the piping structure that can stably ensure the drainage gradient through the horizontal pipe section of the leg joint.

In order to solve the above problems, the present invention proposes the following means.
The piping structure of the present invention is characterized by comprising a leg joint having a vertical pipe section to which a vertical pipe is connected, a horizontal pipe section to which a horizontal pipe is connected, and a curved pipe section connecting the vertical pipe section and the horizontal pipe section, and a first support section connecting the horizontal pipe section, which is arranged below the floor slab, to the floor slab.
According to this invention, when the leg joint swings from the vertical pipe section as a starting point, the position and posture of the horizontal pipe section become unstable. The swinging of the vertical pipe section is easily affected by gravity acting on the horizontal pipe section. By connecting the horizontal pipe section and the floor slab with the first support section, the leg joint can be efficiently prevented from swinging from the vertical pipe section as a starting point, and the drainage gradient of the horizontal pipe section of the leg joint can be stably secured.

In the above piping structure, the horizontal pipe portion may be longer than the vertical pipe portion.
According to this invention, when the horizontal pipe section is longer than the vertical pipe section, the tip of the horizontal pipe section is displaced more in the vertical direction when the leg joint swings from the vertical pipe section as a starting point, compared to when the horizontal pipe section is shorter than the vertical pipe section. Even in this case, since the horizontal pipe section and the floor slab are connected by the first support section, the tip of the horizontal pipe section is prevented from displacing in the vertical direction, and the leg joint can be easily accommodated in the space below the floor slab arranged above the horizontal pipe section.

In addition, the above piping structure may include a second support portion that connects at least one of the vertical pipe portion and the curved pipe portion to the floor slab.
According to this invention, the leg joint can be more reliably connected to the floor slab by the two support parts, the first support part and the second support part.

In addition, in the above-mentioned piping structure, an opening that radially penetrates the side wall may be formed in a side wall of any one of the vertical pipe section, the horizontal pipe section, and the curved pipe section, and the structure may include a thermal expansion material arranged in the opening, and a regulating section that covers the radial outside of the thermal expansion material and is attached to the peripheral portion of the opening in the side wall, regulating the radial outward expansion of the thermal expansion material.
According to this invention, when the thermal expansion material is heated, it expands, but the radial outside of the thermal expansion material is covered by the restricting portion, and this restricting portion is attached to the peripheral portion of the opening of the side wall. Therefore, the thermal expansion material expands toward the radial inside, etc., and the internal space of any one of the vertical pipe portion, the horizontal pipe portion, and the curved pipe portion can be narrowed. For example, the internal space can be blocked by adjusting the amount of thermal expansion material placed in the opening.

In addition, the piping structure construction method of the present invention is a piping structure construction method for constructing any of the piping structures described above in a building having a floor slab, and is characterized by carrying out an installation process for installing the leg joint below the floor slab, a connection process for connecting the horizontal pipe portion of the leg joint and the floor slab with the first support portion, a connection process for connecting the standpipe to the standpipe portion of the leg joint, and a filling process for filling the space between the standpipe connected to the standpipe portion of the leg joint and the floor slab with filler material.
According to this invention, when the leg joint swings from the vertical pipe section as a starting point, the position and posture of the horizontal pipe section become unstable. The swinging of the vertical pipe section is easily affected by gravity acting on the horizontal pipe section. By connecting the horizontal pipe section and the floor slab with the first support section, the leg joint can be efficiently prevented from swinging from the vertical pipe section as a starting point, and the drainage gradient by the horizontal pipe section of the leg joint can be stably secured. Furthermore, by filling the space between the vertical pipe and the floor slab with a filler material, the swinging of the vertical pipe section to which the vertical pipe is connected can be more reliably prevented.

The piping structure and construction method of the piping structure of the present invention can stably ensure the drainage gradient through the horizontal pipe section of the leg joint.

1 is a vertical cross-sectional view of a main part of a multi-storey building in which a drainage structure according to a first embodiment of the present invention is used. 13 is a front view of the leg joint and the second support part in the drainage structure. FIG. FIG. 4 is a front view of a first support portion in the drainage structure. 4 is a flowchart showing a construction method for the drainage structure in the first embodiment of the present invention. 13 is a front view of a first support portion of a drainage structure in a first modified example of the first embodiment of the present invention. FIG. FIG. 11 is a side view of a drainage structure in a second modified example of the first embodiment of the present invention. 13 is a front view of the leg joint and the second support part in the drainage structure. FIG. FIG. 13 is a side view of a drainage structure in a third modified example of the first embodiment of the present invention. 13 is a front view of the leg joint and the second support part in the drainage structure. FIG. FIG. 6 is a side view of a drainage structure according to a second embodiment of the present invention. 11 is a cross-sectional view taken along line AA in FIG. 10. FIG. 4 is a cross-sectional view of a lid in the drainage structure.

First Embodiment
A multi-story building (architecture) in which a first embodiment of the piping structure according to the present invention is used will be described below with reference to Fig. 1 to Fig. 9, taking as an example a case in which the piping structure is a drainage structure. As shown in Fig. 1, in a multi-story building 1, a plurality of stories 5 stacked in the vertical direction are separated by floor slabs 6 provided in the multi-story building 1. A through hole 6a is formed in the floor slab 6, penetrating in the vertical direction.

The drainage structure 11 is used in a multi-story building 1. The drainage structure 11 includes a leg joint 12, a joint 26, stand pipes 36, 37, horizontal pipes 39, 40, a first support portion 46, and a second support portion 51.
As shown in Fig. 1 and Fig. 2, the leg joint 12 includes a vertical pipe section 13, a horizontal pipe section 14, and a curved pipe section 15. In Fig. 1, the boundary between the horizontal pipe section 14 and the curved pipe section 15 is indicated by a two-dot chain line. In Fig. 2, the first support section 46 is indicated by a two-dot chain line.

The vertical pipe section 13 is formed in a straight pipe shape and is arranged so that the axis O1 of the vertical pipe section 13 is along the vertical direction (i.e., the axis O1 of the vertical pipe section 13 is parallel to the pipe axis of the vertical pipe 37). The vertical pipe section 13 is arranged below the floor slab 6. Note that the arrangement of the vertical pipe section 13 is not limited to this, and the vertical pipe section 13 may be arranged so that the axis O1 is inclined with respect to the vertical direction. The vertical pipe section 13 is formed with a vertical pipe connection section 18 which is a receiving port. Note that the connection type of the vertical pipe connection section 18 is not limited to a receiving port, and may be a spigot or a flange. When the connection type of the vertical pipe connection section 18 is a receiving port, the inside of the vertical pipe connection section 18 may be provided with a rubber packing for watertightness, and when the vertical pipe 37 is made of resin, the vertical pipe connection section 18 may be connected to the vertical pipe 37 with an adhesive. The same applies to the horizontal pipe connection section 19, the horizontal pipe connection section 31, etc. described later.

The horizontal pipe section 14 is formed in a straight pipe shape and is disposed so that the axis O2 of the horizontal pipe section 14 is substantially along a horizontal plane. More specifically, the horizontal pipe section 14 is disposed so that the axis O2 faces downward as it approaches the downstream side, forming a drainage gradient in the horizontal pipe section 14.
A horizontal pipe connection portion 19 , which is a flange, is formed at the downstream end of the horizontal pipe portion 14 .
In this example, the length L2 of the horizontal pipe section 14 along the axis O2 is longer than the length L1 of the vertical pipe section 13 along the axis O1. For example, if the horizontal pipe section has no portion along the axis O2 or if the portion along the axis O2 is short, or if the portion of the horizontal pipe section supported by the first support section 46 is curved, it becomes difficult to support the horizontal pipe section by the first support section 46. In contrast, by forming the horizontal pipe section 14 into a straight pipe shape as in this embodiment, it becomes easier to support the horizontal pipe section 14 by the first support section 46.

The curved pipe portion 15 is formed in a curved tubular shape. The curved pipe portion 15 connects the vertical pipe portion 13 and the horizontal pipe portion 14. A boss 20 is formed at the lower portion of the curved pipe portion 15. The boss 20 protrudes downward from the outer circumferential surface of the lower portion of the curved pipe portion 15.
In this example, the entire leg joint 12, which includes the vertical pipe section 13, the horizontal pipe section 14, and the curved pipe section 15, is positioned below the floor slab 6.
The leg joint 12 may be made of a resin such as polyvinyl chloride (PVC), etc. It is particularly preferable that the leg joint 12 be made of a resin having excellent impact resistance.

Examples of resins with excellent impact resistance include vinyl chloride resins, such as (1) resins obtained by mixing polyvinyl chloride polymers with impact-modified resins, (2) resins obtained by graft copolymerization of polyvinyl chloride polymers with impact-modified resins, (3) copolymers of vinyl chloride monomers with monomers having unsaturated bonds copolymerizable with the vinyl chloride monomers, and (4) graft copolymers obtained by graft copolymerization of vinyl chloride with (co)polymers other than vinyl chloride. These (1) to (4) may be used alone or in combination of two or more kinds. Furthermore, the polyvinyl chloride resins may be chlorinated as necessary.

Examples of the impact-improving resin to be mixed with the polyvinyl chloride polymer in (1) above, and the impact-improving resin to be graft-copolymerized with the polyvinyl chloride polymer in (2) above, include resins having rubber properties. Specific examples include acrylonitrile-butadiene-styrene copolymer, methyl methacrylate-butadiene-styrene copolymer, acrylic rubber, chlorinated polyethylene, ethylene-vinyl acetate copolymer resin, and acrylonitrile-butadiene copolymer. These may be used alone, or two or more types may be used in combination.

The leg joint 12 may be made of metal. Cast iron is a particular example of metal, and it is more difficult to ensure a proper drainage gradient with cast iron, which is heavier than plastic, and the effects of the present invention are greater.

There is no particular limitation on the configuration of the collective joint 26. In this example, the collective joint 26 is composed of two members, an upper connecting pipe 27 and a lower connecting pipe 28. Note that the collective joint may be integrally composed of one member, or may be composed of three or more members.
The upper connecting pipe 27 comprises a pipe main body 30, a horizontal pipe connecting portion 31 fixed to the outer peripheral surface of the pipe main body 30, and a vertical pipe connecting portion 32 fixed to the upper end of the pipe main body 30.
The pipe body 30 is disposed above the leg joint 12 so that its axis is aligned in the vertical direction. In this example, a plurality of horizontal pipe connecting parts 31 are fixed to the outer circumferential surface of the pipe body 30. The number of horizontal pipe connecting parts 31 fixed to the pipe body 30 is not particularly limited, and may be one, or two or more.
The joint assembly 26 may be made of a resin such as polyvinyl chloride (PVC) or a metal such as cast iron.

The lower connecting pipe 28 is formed in a tubular shape with an outer diameter and an inner diameter that decrease toward the bottom. The lower connecting pipe 28 may have substantially the same outer diameter and inner diameter as the pipe body 30, but is at least equal to or larger than the outer diameter and inner diameter of the standpipe 36. The lower end of the lower connecting pipe 28 is a spigot. The lower connecting pipe 28 is fixed to the lower end of the pipe body 30 of the upper connecting pipe 27. The lower end of the lower connecting pipe 28 may be a socket or a flange. The lower connecting pipe 28 may not be connected to the standpipe connection part 18 of the leg joint 12 via the standpipe 37, and the lower connecting pipe 28 of the collective joint 26 may be directly connected to the standpipe connection part 18 of the leg joint 12.

The collective joint 26 configured in this manner is arranged so that the horizontal pipe connection portion 31 and the vertical pipe connection portion 32 are positioned above the floor slab 6, and at least a portion of the lower connecting pipe 28 is positioned within the through hole 6a of the floor slab 6.
A filler 7 such as mortar is filled between the opening periphery of the through hole 6a in the floor slab 6 and the lower connecting pipe 28. The filler 7 is disposed to close the through hole 6a.
The filler 7 may be glass wool (GW), rock wool (RW), or the like. However, by using mortar as the filler 7, the positions of the lower connecting pipe 28 and the standpipe 37 relative to the floor slab 6 are fixed by the filler 7. Since glass wool and rock wool are made of fibers, the positions of the lower connecting pipe 28, etc., relative to the floor slab 6 cannot be fixed. Therefore, even if the weight balance of the leg joint 12 connected to the standpipe 37 is poor, the direction of the drainage gradient set in the horizontal pipe portion 14 of the leg joint 12 can be maintained.

The lower end of the standpipe 36 is connected to the standpipe connection portion 32 of the collecting joint 26. The standpipe 36 guides to the collecting joint 26 wastewater discharged from sanitary equipment (drainage equipment) such as toilets, vanities, and sinks (not shown) arranged in a layer 5 (hereinafter also referred to as layer 5A) above the layer 5 in which the upper connecting pipe 27 of the collecting joint 26 is arranged.
An upper end of the riser pipe 37 is connected to a lower end of the lower connecting pipe 28 of the collective joint 26. A lower end of the riser pipe 37 is connected to the riser pipe connecting portion 18 of the riser pipe portion 13 of the leg joint 12.

The horizontal pipe 39 is connected to the horizontal pipe connection portion 31 of the collecting joint 26. The horizontal pipe 39 guides, to the collecting joint 26, wastewater discharged from sanitary equipment (not shown) arranged in the layer 5A.
The horizontal pipe 40 is connected to the horizontal pipe connection portion 19 of the horizontal pipe portion 14 of the leg joint 12. The horizontal pipe 40 guides the wastewater guided to the collection joint 26 via the leg joint 12 to a wastewater treatment facility (not shown) or the like outside the multi-story building 1.

1 and 3, the first support section 46 is a so-called single-suspension type support section. The first support section 46 connects the horizontal pipe section 14 of the leg joint 12 and the floor slab 6. The first support section 46 includes a support bracket 47, a rod 48, and an anchor 49.
The support fitting 47 includes, for example (not shown), a metal belt-shaped member and an opening/closing mechanism for connecting both ends of the belt-shaped member to each other. The opening/closing mechanism can be switched between a connected state in which both ends of the belt-shaped member are connected to each other and a released state in which the connection between both ends is released. When the opening/closing mechanism is in the released state, the horizontal pipe portion 14 of the leg joint 12 can be inserted into the belt-shaped member from outside the U-shaped member, or the horizontal pipe portion 14 can be removed from inside the belt-shaped member to outside the belt-shaped member.
On the other hand, when the opening and closing mechanism is in the connected state, the horizontal tube portion 14 inside the belt-shaped member is fixed to the belt-shaped member.

A male screw is formed on the outer circumferential surface of the rod 48 over the entire length of the rod 48. The rod 48 is a so-called fully threaded bolt. The rod 48 is disposed so as to extend in the up-down direction. The lower end of the rod 48 is fixed to the band-shaped member of the support bracket 47.
The anchor 49 is embedded in the lower end of the floor slab 6. The female thread formed in the anchor 49 is exposed from the lower surface of the floor slab 6 to the outside of the floor slab 6. The male thread at the upper end of the rod 48 is fitted into the female thread of the anchor 49.
The configuration of the first support portion 46 is not limited to this.

1 and 2 , the second support portion 51 connects the curved pipe portion 15 of the leg joint 12 and the floor slab 6. The second support portion 51 includes a support member 52, a rod 53, a nut 54, and an anchor 55.
The support member 52 has an L-shaped cross section perpendicular to the longitudinal direction. The support member 52 is disposed so as to extend in a direction along a horizontal plane perpendicular to the axis O2 of the horizontal tube portion 14. The support member 52 protrudes on both sides in the perpendicular direction beyond the leg joint 12. A through hole (not shown) penetrating in the up-down direction is formed at each of both ends of the support member 52 in the perpendicular direction.
The support member 52 supports the boss 20 of the leg joint 12 from below the boss 20 .

The rods 53 are configured similarly to the rods 48, and a pair of rods 53 are provided on the second support portion 51. The rods 53 are arranged along the up-down direction. The lower ends of the rods 53 are inserted into through holes of the support member 52 and fixed to the support member 52 by nuts 54.
The anchor 55 is embedded in the lower end of the floor slab 6. The female thread formed in the anchor 55 is exposed to the outside of the floor slab 6 from the lower surface of the floor slab 6. The male thread at the upper end of the rod 53 is fitted into the female thread of the anchor 55.
Although the second support portion 51 is said to connect the curved pipe portion 15 and the floor slab 6, the second support portion may also connect the vertical pipe portion 13 of the leg joint 12 and the floor slab 6, or the second support portion may connect the vertical pipe portion 13 and the curved pipe portion 15 of the leg joint 12 and the floor slab 6.

Each of the first support portion 46 and the second support portion 51 may include rubber having vibration-proof properties. This rubber is disposed, for example, between the band-shaped member of the first support portion 46 and the horizontal tube portion 14.
The first support portion 46 and the second support portion 51 may be made of resin instead of metal.

As shown in FIG. 1, an axis that passes through the vertical pipe portion 13 and is perpendicular to the axis O1 and the axis O2 is defined as O3.
Also, an axis that passes through a portion where the second support part 51 supports the leg joint 12 and is perpendicular to the axis O1 and the axis O2 is defined as O4. If the drainage structure 11 does not have the first support part 46 and the stand pipe 37 and the horizontal pipe 40 are not connected to the leg joint 12, the leg joint 12 will sway around the axis O4. By connecting the leg joint 12 to the stand pipe 37 fixed to the floor slab 6 by the filling material 7, it is possible to prevent the leg joint 12 from swaying around the axis O4.

Next, a description will be given of a construction method for the drainage structure 11 of this embodiment, in which the drainage structure 11 configured as above is constructed in the multi-story building 1. Fig. 4 is a flowchart showing a construction method S for the drainage structure in one embodiment of the present invention.
First, in an installation step (step S1 in FIG. 4), the leg joint 12 is installed at a predetermined position below the floor slab 6. When the installation step S1 is completed, the process proceeds to step S2.
Next, in a connecting step S2, the horizontal pipe portion 14 of the leg joint 12 and the floor slab 6 are connected by the first support portion 46. When the connecting step S2 is completed, the process proceeds to step S3.

Next, in a connection step S3, a riser pipe 37 is connected to the riser pipe connection portion 18 of the riser pipe section 13 of the leg joint 12. In the connection step S3, the riser pipe 37 is further connected to the lower connection pipe 28 of the collective joint 26. The riser pipe 36 is connected to the riser pipe connection portion 32 of the collective joint 26, and a horizontal pipe 39 is connected to the horizontal pipe connection portion 31 of the collective joint 26. A horizontal pipe 40 is connected to the horizontal pipe connection portion 19 of the horizontal pipe section 14 of the leg joint 12.
When the connection step S3 is completed, the process proceeds to step S4.

Next, in a filling step S4, the filler 7 is filled between the standpipe 37 connected to the standpipe portion 13 of the leg joint 12 and the opening peripheral portion of the through hole 6a in the floor slab 6. The filler 7 is also filled between the opening peripheral portion of the through hole 6a in the floor slab 6 and the lower connecting pipe 28 of the collective joint 26.
When the filling process S4 is completed, all the processes of the drainage structure construction method S are completed, and the drainage structure 11 is constructed in the multi-story building 1.

The order in which the joining step S2, the connection step S3, and the filling step S4 are performed is not particularly limited. For example, the filling step, the connection step, and the joining step may be performed in this order after the installation step S1.

As described above, according to the drainage structure 11 of this embodiment, when the leg joint 12 swings around the axis O3 starting from the vertical pipe section 13, the position and posture of the horizontal pipe section 14 become unstable. The above-mentioned swinging of the vertical pipe section 13 is easily affected by gravity acting on the horizontal pipe section 14. By connecting the horizontal pipe section 14 and the floor slab 6 with the first support section 46, it is possible to efficiently prevent the leg joint 12 from swinging around the axis O3 starting from the vertical pipe section 13, and to stably ensure the drainage gradient by the horizontal pipe section 14 of the leg joint 12.
By supporting the horizontal pipe section 14 with the first support section 46, the degree of freedom when constructing the drainage structure 11 can be increased.

The horizontal pipe section 14 is longer than the vertical pipe section 13. In this case, when the leg joint 12 swings around the axis O3 starting from the vertical pipe section 13, the tip of the horizontal pipe section 14 (the end where the horizontal pipe connection section 19 is provided) is displaced significantly in the vertical direction compared to when the horizontal pipe section 14 is shorter than the vertical pipe section 13. Even in this case, since the horizontal pipe section 14 and the floor slab 6 are connected by the first support section 46, the tip of the horizontal pipe section 14 is prevented from displacing in the vertical direction, and the leg joint 12 can be easily accommodated in the space below the floor slab 6 arranged immediately above the horizontal pipe section 14 (the leg joint 12 can be fitted better).
The drainage structure 11 includes the second support portion 51. Therefore, the two support portions, the first support portion 46 and the second support portion 51, can more reliably connect the leg joint 12 to the floor slab 6. The strength of the drainage structure 11 against vibration and impact can be improved.

In addition, according to the construction method S of the drainage structure of this embodiment, by filling the space between the standpipe 37 and the floor slab 6 with filler material 7, it is possible to more reliably prevent the standpipe section 13 to which the standpipe 37 is connected from shaking.

The drainage structure 11 of this embodiment can have a configuration that can be modified in various ways as described below.
5, a so-called two-strand type support portion may be used as the first support portion 61. The first support portion 61 includes support pieces 62 and 63, a rod 48, and an anchor 49.
The support piece 62 includes a main body 62a and protruding portions 62b and 62c. The main body 62a is formed in a C-shape from a metal band-shaped member, for example. The inner diameter of the main body 62a and the outer diameter of the horizontal tube portion 14 of the leg joint 12 are approximately equal to each other. The protruding portion 62b protrudes radially outward from a first end portion of the main body 62a in the circumferential direction. The protruding portion 62c protrudes radially outward from a second end portion of the main body 62a in the circumferential direction. The protruding portions 62b and 62c each have a through hole (not shown) that penetrates in the up-down direction.

The support piece 63 has the same configuration as the support piece 62. That is, the support piece 63 includes a main body 63a and protruding portions 63b and 63c that are configured in the same manner as the main body 62a and the protruding portions 62b and 62c.
The support pieces 62, 63 sandwich the horizontal pipe portion 14 of the leg joint 12 in the vertical direction.
A pair of rods 48 are provided on the first support portion 61. The lower end of one rod 48 is inserted into the through holes of the protruding portions 62b, 63b, respectively, and fixed to the protruding portions 62b, 63b by a nut 54. The lower end of the other rod 48 is inserted into the through holes of the protruding portions 62c, 63c, respectively, and fixed to the protruding portions 62c, 63c by a nut 54.
A pair of anchors 49 are provided on the first support portion 61. The male threads on the upper end portion of the rod 48 are fitted into the female threads of each anchor 49, respectively.
The first support portion 61 configured as described above can also connect the horizontal pipe portion 14 of the leg joint 12 to the floor slab 6.

6 and 7, a drainage structure 11B of a second modification may be provided with a second support portion 66 and a third support portion 71 instead of the leg joint 12, the vertical pipe 37, the horizontal pipe 39, and the second support portion 51 of the drainage structure 11A of the present embodiment. In this modification, a vertical pipe connection portion 18A, which is a flange, is formed in the vertical pipe portion 13.
In this modified example, the outer diameter and inner diameter of the horizontal pipe section 14 are larger than the outer diameter and inner diameter of the vertical pipe section 13. In the curved pipe section 15, the outer diameter and inner diameter gradually increase from the vertical pipe section 13 side toward the horizontal pipe section 14 side.

The second support portion 66 connects the vertical pipe portion 13 of the leg joint 12 and the floor slab 6. The second support portion 66 includes support pieces 67, 68, a rod 53, a nut 54, and an anchor 55.
The support pieces 67, 68 are configured in the same manner as the support pieces 62, 63, and sandwich the vertical pipe portion 13 of the leg joint 12 in the radial direction of the vertical pipe portion 13.
A pair of rods 53 are provided on the second support portion 66. The lower end of each rod 53 is fixed to support pieces 67, 68. The male threads on the upper end of each rod 53 are fitted into the female threads of each anchor 55, respectively.

In this modified example, the lower end of the riser pipe 36 is connected to the riser pipe connection portion 18A of the riser pipe section 13.
The third support portion 71 is a so-called single-suspension type support portion, and is configured similarly to the first support portion 46. The third support portion 71 connects the horizontal pipe 40 and the floor slab 6 together.

In the drainage structure 11B configured in this manner, the outer and inner diameters of the horizontal pipe section 14 are larger than the outer and inner diameters of the vertical pipe section 13, respectively, and the center of gravity of the leg joint 12 is biased toward the horizontal pipe section 14, making it difficult to ensure the drainage gradient set in the horizontal pipe section 14. Furthermore, if the axis O1 of the vertical pipe section 13 is arranged so as to be inclined relative to the vertical direction (i.e., the axis O1 of the vertical pipe section 13 is not parallel to the pipe axis of the vertical pipe 36), the leg joint 12 will be more likely to incline toward the horizontal pipe section 14, making it even more difficult to ensure the drainage gradient of the horizontal pipe section 14.

As in the drainage structure 11C of the third modified example shown in Figures 8 and 9, a second support portion 76 may be provided instead of the second support portion 66 of the drainage structure 11B of the modified example. Note that the boundary between the vertical pipe portion 13 and the curved pipe portion 15 is indicated by a two-dot chain line.
In this modified example, the lower end of the vertical pipe portion 13 is positioned within the through hole 6a of the floor slab 6, and the upper end of the vertical pipe portion 13 protrudes above the floor slab 6.
The second support portion 76 connects the vertical pipe portion 13 of the leg joint 12 to the floor slab 6 above the floor slab 6. The second support portion 76 includes a support bracket 77, a rod 53, and an anchor 55.
The support fitting 77 is detachably attached to the upper end of the vertical pipe portion 13 by a known configuration. The support fitting 77 protrudes from the vertical pipe portion 13 on both sides in the orthogonal direction.
A pair of rods 53 are provided on the second support portion 76. The middle portion of each rod 53 in the vertical direction is fixed to a support bracket 77.
The anchor 55 is embedded in the upper end of the floor slab 6. The female thread formed in the anchor 55 is exposed to the outside of the floor slab 6 from the upper surface of the floor slab 6. The male thread at the lower end of the rod 53 is fitted into the female thread of the anchor 55.

Second Embodiment
Next, a second embodiment of the present invention will be described with reference to FIGS. 10 to 12. The same components as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted. Only the differences will be described.
10 and 11, the drainage structure 81 of the present embodiment includes, in addition to the components of the drainage structure 11B of the second modified example of the first embodiment, a pair of lids 85. Note that the upper part of the drainage structure 81 and the like are also shown in FIG.
An opening 15b is formed in the side wall 15a of the curved pipe portion 15, penetrating the side wall 15a in the radial direction. A pair of the openings 15b are formed on either side of the central axis of the curved pipe portion 15.
A flange 82 is attached to the periphery of the opening 15b of the side wall 15a and projects outward in the radial direction. The flange 82 is disposed around the entire periphery. A plurality of bolt holes (not shown) are formed in the flange 82.
In this embodiment, since the horizontal pipe 40 does not need to be fire-resistant, the horizontal pipe 40 is made of a resin such as polyvinyl chloride.

As shown in FIG. 12 , the lid body 85 includes an outer lid (regulating portion) 86 , an inner lid 87 , and a thermal expansion material 88 .
The outer lid 86 includes an outer lid main body 90 formed in a cylindrical shape with a bottom, and a flange 91 provided on a peripheral wall portion of the outer lid main body 90. The flange 91 protrudes toward the outside of the peripheral wall portion of the outer lid main body 90 and is provided around the entire circumference of the peripheral wall portion. The flange 91 has a plurality of through holes (not shown) formed at positions corresponding to the bolt holes of the curved pipe portion 15.
An outer lid body 90 and a flange 91 that constitute the outer lid 86 are integrally formed from a metal such as cast iron.

The inner lid 87 includes an inner lid body 93 formed in a cylindrical shape with a bottom, and a flange 94 provided on the peripheral wall of the inner lid body 93 .
The inner lid body 93 is formed to have approximately the same size as the outer lid body 90 of the outer lid 86, and is formed to a size that can be placed within the flange 82 of the curved pipe portion 15 (see FIG. 11). The bottom wall portion of the inner lid body 93 is curved to a shape corresponding to the side wall 15a of the curved pipe portion 15.
The flange 94 protrudes outward from the peripheral wall of the inner lid body 93 and is provided around the entire circumference of the peripheral wall. The flange 94 has a plurality of through holes (not shown) formed at positions corresponding to the bolt holes of the curved pipe portion 15.
An inner lid body 93 and a flange 94 that constitute the inner lid 87 are integrally formed from a synthetic resin such as polyvinyl chloride.
The inner lid 87 is disposed so that the internal space of the inner lid body 93 communicates with the internal space of the outer lid body 90 of the outer lid 86 .

The thermal expansion material 88 is made of a rubber-based material or a resin material containing thermal expansion graphite. For example, when the temperature reaches 200 degrees or higher, a material that thermally expands and expands in volume by 5 to 40 times is used for the thermal expansion material 88. For example, a thermally expandable fire-resistant material manufactured by CRK Corporation is used as the thermal expansion material 88.
The thermal expansion material 88 is formed in a cylindrical shape, and is disposed between the outer lid 86 and the inner lid 87. The thermal expansion material 88 is disposed in the opening 15b of the curved pipe portion 15.
11 , the lid 85 is attached to the curved pipe portion 15 by passing a bolt 96 through a through hole in the outer lid 86 and a through hole in the inner lid 87 and fitting it into a bolt hole in the curved pipe portion 15. The outer lid 86 and the inner lid 87 are attached to the periphery of the opening 15b of the side wall 15a. The lid 85 is detachable from the periphery. The opening 15b also functions as a cleaning port for cleaning the inside of the curved pipe portion 15.

The outer lid 86 covers the radial outside of the curved pipe section 15 relative to the thermal expansion material 88. The outer lid 86 restricts the radial outward expansion of the curved pipe section 15 in the thermal expansion material 88.

In the drainage structure 81 of this embodiment configured as described above, when the thermal expansion material 88 is heated by a fire or the like, the thermal expansion material 88 expands, but the radial outside of the thermal expansion material 88 is covered by the outer lid 86, which is attached to the peripheral portion of the opening 15b of the side wall 15a. Therefore, the thermal expansion material 88 expands toward the radial inside, etc., and the internal space of the curved pipe portion 15 can be narrowed. Then, by adjusting the amount of the thermal expansion material 88 disposed in the opening 15b, the internal space of the curved pipe portion 15 can be blocked.
In the event of a fire, the horizontal pipe 40 disappears.

It is preferable that the distance between the pair of openings 15b is wider than the width of the horizontal pipe section 14, and the second support section 66 supports the vertical pipe section 13 rather than the curved pipe section 15 so that the second support section 66 does not interfere with the openings 15b.
In addition, in order to allow heat in the event of a fire to be quickly transferred to the opening 15b and cause the thermal expansion material 88 to thermally expand, it is preferable for the second support portion 66 to support the vertical pipe portion 13 rather than the curved pipe portion 15.
In particular, as shown in Figure 10, when the leg joint 12 is positioned so that the axis O1 of the vertical pipe section 13 is inclined relative to the vertical direction, the center of gravity of the leg joint 12 is further biased toward the horizontal pipe 40 due to the mass of the cover body 85, so the presence of the first support section 46 becomes important.

In other words, if the first support part 46 is not present, if the horizontal pipe 40 is burned during a fire and the leg joint 12 tilts, a gap will appear at the connection between the vertical pipe 36 and the leg joint 12, which may reduce the fire resistance of the drainage structure 81.
In response to this, the drainage structure 81 is provided with the first support portion 46, thereby improving fire resistance.
In this embodiment, the lid body 85 is attached to the curved pipe portion 15, but the lid body 85 may be attached to the vertical pipe portion 13 or the horizontal pipe portion 14. The lid body 85 does not need to include the inner lid 87.

Although the first and second embodiments of the present invention have been described above in detail with reference to the drawings, the specific configurations are not limited to these embodiments, and the present invention also includes modifications, combinations, deletions, etc. of the configurations within the scope of the gist of the present invention. Furthermore, it goes without saying that the configurations shown in each embodiment can be used in appropriate combinations.
For example, in the first and second embodiments, the horizontal pipe section 14 may have the same length as the vertical pipe section 13 or may be shorter than the vertical pipe section 13.
The drainage structure does not need to include the second support portion and the third support portion 71.
Although the piping structure is described as a drainage structure, the piping structure is not limited to this and may be a water supply structure or the like.

1 Multi-story building (building)
6 Floor slab 7 Filler 11, 11A, 11B, 11C, 81 Drainage structure (piping structure)
12 Leg joint 13 Stand pipe part 14 Horizontal pipe part 15 Bent pipe part 15a Side wall 15b Opening part 36, 37 Stand pipe 39, 40 Horizontal pipe 46, 61 First support part 51, 66, 76 Second support part 86 Outer cover (regulating part)
88 Thermal expansion material S Piping structure construction method S1 Installation process S2 Connection process S3 Connection process S4 Filling process

Claims (4)

A riser connection portion located below the floor slab, the riser connection portion having a collective joint or a receiving port to which a riser is connected, the collective joint being installed in a through hole of the floor slab ;
a horizontal pipe connection portion to which a resin horizontal pipe is connected;
A curved pipe portion connecting the vertical pipe connection portion and the horizontal pipe connection portion;
a horizontal pipe portion that connects the curved pipe portion and the horizontal pipe connection portion;
A resin leg joint having
The horizontal pipe portion is supported by a first support portion connected to the underside of the floor slab,
The leg joint is made of a resin obtained by mixing a polyvinyl chloride polymer with an impact-modified resin, or a resin obtained by graft-copolymerizing a polyvinyl chloride polymer with an impact-modified resin. A vertical pipe portion that connects the curved pipe portion and the vertical pipe connection portion is provided,
The horizontal pipe portion is longer than the vertical pipe portion.
A leg joint according to claim 1. A leg joint according to claim 1;
A collective joint connected to the riser pipe connection portion of the leg joint;
A piping structure comprising: Floor slabs and
A joint or standpipe;
The leg joint according to claim 1 , which is connected to the collective joint or the riser pipe;
A horizontal pipe connected to the leg joint;
A building equipped with:

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