Foot joints, piping structures, and buildings

Abstract

To provide a piping structure capable of stably securing a drainage slope by a lateral pipe section of a leg part joint.SOLUTION: A piping structure 11 comprises: a leg part joint 12 having a vertical pipe part 13 connected with a vertical pipe 37, a lateral pipe part 14 connected with a lateral pipe 40, and a bend 15 connecting the vertical pipe part 13 with the lateral pipe part 14; and a first support part 46 connecting the lateral pipe part 14 arranged under a floor slab 6 with the floor slab 6.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a piping structure and a method for constructing the piping structure. [Background technology]

[0002] Conventionally, a piping structure including a leg joint and a support part (first support part) that connects the leg joint to a floor slab has been 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. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-270219 Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, in order to efficiently direct wastewater and other water flowing within the piping structure downstream, the horizontal pipe section of the leg joint is formed with a drainage gradient that slopes downward as it moves downstream. However, the piping structure disclosed in Patent Document 1 cannot stably ensure the drainage gradient due to the horizontal pipe section.

[0005] The present invention has been made in consideration of such problems, and aims to provide a piping structure and a construction method for the piping structure that can stably ensure a drainage gradient through the horizontal pipe section of the leg joint. [Means for solving the problem]

[0006] 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 that connects 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 a stable drainage gradient can be ensured by the horizontal pipe section of the leg joint.

[0007] 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 vertically 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, because 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 vertically, and the leg joint can be easily accommodated in the space below the floor slab arranged above the horizontal pipe section.

[0008] The above piping structure may further 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 two support portions, the first support portion and the second support portion, can more reliably connect the leg joint to the floor slab.

[0009] In addition, in the above-mentioned piping structure, an opening that radially penetrates the side wall may be formed in the 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 radially outer side of the thermal expansion material is covered by a restricting portion, which is attached to the periphery of the opening in the side wall. Therefore, the thermal expansion material expands radially inward, etc., and the internal space of any one of the vertical pipe portion, horizontal pipe portion, and 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.

[0010] In addition, the piping structure construction method of the present invention is a piping structure construction method in which any of the piping structures described above is constructed in a building having a floor slab, and is characterized by carrying out an installation process in which the leg joint is installed below the floor slab, a connection process in which the horizontal pipe portion of the leg joint and the floor slab are connected by the first support portion, a connection process in which the standpipe is connected to the standpipe portion of the leg joint, and a filling process in which a filler material is filled between the standpipe connected to the standpipe portion of the leg joint and 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 provided by the horizontal pipe section of the leg joint can be stably ensured. 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. [Effects of the Invention]

[0011] According to the piping structure and the construction method of the piping structure of the present invention, the drainage gradient can be stably ensured by the horizontal pipe portion of the leg joint. [Brief explanation of the drawings]

[0012] [Figure 1] 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. [Figure 2] FIG. 4 is a front view of the leg joint and the second support part in the drainage structure. [Figure 3] FIG. 4 is a front view of a first support part in the drainage structure. [Figure 4] 3 is a flowchart showing a construction method of the drainage structure in the first embodiment of the present invention. [Figure 5] FIG. 10 is a front view of a first support part of the drainage structure in a first modified example of the first embodiment of the present invention. [Figure 6] FIG. 10 is a side view of a drainage structure in a second modified example of the first embodiment of the present invention. [Figure 7] FIG. 4 is a front view of the leg joint and the second support part in the drainage structure. [Figure 8] FIG. 10 is a side view of a drainage structure in a third modified example of the first embodiment of the present invention. [Figure 9] FIG. 4 is a front view of the leg joint and the second support part in the drainage structure. [Figure 10] FIG. 4 is a side view of a drainage structure according to a second embodiment of the present invention. [Figure 11] 11 is a cross-sectional view taken along the line AA in FIG. 10. [Figure 12] FIG. 4 is a cross-sectional view of the lid body in the drainage structure. DETAILED DESCRIPTION OF THE INVENTION

[0013] (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 Figs. 1 to 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 vertically 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 vertically.

[0014] The drainage structure 11 is used in a multi-story building 1. The drainage structure 11 includes a leg joint 12, a joint assembly 26, vertical pipes 36, 37, horizontal pipes 39, 40, a first support portion 46, and a second support portion 51. 1 and 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.

[0015] The standpipe section 13 is formed in a straight pipe shape and is arranged so that the axis O1 of the standpipe section 13 is along the vertical direction (i.e., so that the axis O1 of the standpipe section 13 is parallel to the pipe axis of the standpipe 37). The standpipe section 13 is arranged below the floor slab 6. Note that the arrangement of the standpipe section 13 is not limited to this, and the standpipe section 13 may be arranged so that the axis O1 is inclined with respect to the vertical direction. A standpipe connection section 18, which is a receiving port, is formed in the standpipe section 13. Note that the connection type of the standpipe connection section 18 is not limited to a receiving port, and may be a spigot, a flange, or the like. When the connection type of the standpipe connection section 18 is a receiving port, the standpipe connection section 18 may be provided with a rubber gasket for waterproofing inside, and when the standpipe 37 is made of resin, the standpipe connection section 18 may be connected to the standpipe 37 with an adhesive. The same applies to the horizontal pipe connection section 19, horizontal pipe connection section 31, etc., which will be described later.

[0016] The horizontal pipe section 14 is formed in a straight pipe shape and is arranged so that the axis O2 of the horizontal pipe section 14 is approximately along a horizontal plane. More specifically, the horizontal pipe section 14 is arranged so that the axis O2 points downward as it moves downstream, 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 does not have a portion along the axis O2, or if the portion along the axis O2 is short, or if the portion of the horizontal pipe section that is 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.

[0017] 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 bottom of the curved pipe portion 15. The boss 20 protrudes downward from the outer peripheral surface of the bottom of the curved pipe portion 15. In this example, the entire leg joint 12 including 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 that has excellent impact resistance.

[0018] Resins with excellent impact resistance include, for example, 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. Furthermore, the polyvinyl chloride resins may be chlorinated as needed.

[0019] The impact-improving resin to be mixed with the polyvinyl chloride polymer in (1) above, or the impact-improving resin to be graft-copolymerized with the polyvinyl chloride polymer in (2) above, may be a resin 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 in combination of two or more.

[0020] The leg joint 12 may be made of metal. Cast iron is particularly an example of metal, and since cast iron is heavier than resin, it is more difficult to ensure a drainage gradient than resin, making the present invention more effective.

[0021] There are no particular limitations on the configuration of the collective joint 26. In this example, the collective joint 26 is made up of two members: an upper connecting pipe 27 and a lower connecting pipe 28. The collective joint may be integrally made up of one member, or may be made up 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 main body 30 is disposed above the leg joint 12 so that its axis is aligned in the vertical direction. In this example, multiple horizontal pipe connecting parts 31 are fixed to the outer peripheral surface of the pipe main body 30. The number of horizontal pipe connecting parts 31 fixed to the pipe main body 30 is not particularly limited, and may be one, or two or more. The collective joint 26 may be made of a resin such as polyvinyl chloride (PVC), or may be made of a metal such as cast iron.

[0022] The lower connecting pipe 28 is formed in a tubular shape with its outer and inner diameters decreasing downward. The lower connecting pipe 28 may have substantially the same outer and inner diameters as the pipe body 30, but is at least equal to or larger than the outer and inner diameters 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, flange, or the like. The lower connecting pipe 28 may not be connected to the standpipe connecting portion 18 of the leg joint 12 via the standpipe 37, and the lower connecting portion 28 of the manifold joint 26 may be directly connected to the standpipe connecting portion 18 of the leg joint 12.

[0023] The thus configured collective joint 26 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 placed 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. Because 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.

[0024] 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, sinks, etc. (not shown) that are arranged on a layer 5 (hereinafter also referred to as layer 5A) above the layer 5 on which the upper connecting pipe 27 of the collecting joint 26 is arranged. The upper end of the standpipe 37 is connected to the lower end of the lower connecting pipe 28 of the joint assembly 26. The lower end of the standpipe 37 is connected to the standpipe connecting portion 18 of the standpipe portion 13 of the leg joint 12.

[0025] 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 on 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 led 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.

[0026] 1 and 3, the first support section 46 is a so-called single-hanging type support section. The first support section 46 connects the horizontal pipe section 14 of the leg joint 12 to the floor slab 6. The first support section 46 includes a support bracket 47, a rod 48, and an anchor 49. Although not shown, the support fitting 47 includes, for example, a metal band-shaped member and an opening / closing mechanism that connects both ends of the band-shaped member to each other. The opening / closing mechanism can be switched between a connected state in which both ends of the band-shaped member are connected to each other and a released state in which the connection between the 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 U-shaped band-shaped member from outside, or the horizontal pipe portion 14 can be removed from inside the band-shaped member to outside. 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.

[0027] 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 arranged so as to extend in the vertical direction. The lower end of the rod 48 is fixed to the strip-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.

[0028] 1 and 2, the second support part 51 connects the curved pipe part 15 of the leg joint 12 and the floor slab 6. The second support part 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 arranged to extend in a direction along the 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 end 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 .

[0029] The rods 53 are configured similarly to the rods 48, and are provided as a pair on the second support part 51. The rods 53 are arranged along the vertical direction. The lower ends of the rods 53 are inserted into through holes in 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 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 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 also connect the vertical pipe portion 13 and curved pipe portion 15 of the leg joint 12 and the floor slab 6.

[0030] 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 strip-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.

[0031] 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. Furthermore, an axis O4 passes through the portion where the second support portion 51 supports the leg joint 12 and is perpendicular to the axis O1 and the axis O2. If the drainage structure 11 does not have the first support portion 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 filler material 7, it is possible to prevent the leg joint 12 from swaying around the axis O4.

[0032] 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 the 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 the 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.

[0033] Next, in the connection step S3, the standpipe 37 is connected to the standpipe connection portion 18 of the standpipe section 13 of the leg joint 12. In the connection step S3, the standpipe 37 is further connected to the lower connection pipe 28 of the collecting joint 26. The standpipe 36 is connected to the standpipe connection portion 32 of the collecting joint 26, and a horizontal pipe 39 is connected to the horizontal pipe connection portion 31 of the collecting 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.

[0034] 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 periphery of the through hole 6a in the floor slab 6. The filler 7 is also filled between the opening periphery of the through hole 6a in the floor slab 6 and the lower connecting pipe 28 of the collective joint 26. When the filling step S4 is completed, all steps of the drainage structure construction method S are completed, and the drainage structure 11 is constructed in the multi-story building 1.

[0035] The order in which the linking step S2, the connecting step S3, and the filling step S4 are performed is not particularly limited, and for example, the filling step, the connecting step, and the linking step may be performed in this order after the setting step S1.

[0036] 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, the leg joint 12 is efficiently prevented from swinging around the axis O3 starting from the vertical pipe section 13, and the drainage gradient provided by the horizontal pipe section 14 of the leg joint 12 can be stably ensured. By supporting the horizontal pipe portion 14 with the first support portion 46, the degree of freedom when constructing the drainage structure 11 can be increased.

[0037] The horizontal pipe section 14 is longer than the vertical pipe section 13. In this case, compared to when the horizontal pipe section 14 is shorter than the vertical pipe section 13, when the leg joint 12 swings around the axis O3 starting from the vertical pipe section 13, the tip end of the horizontal pipe section 14 (the end where the horizontal pipe connection section 19 is provided) is displaced more significantly in the vertical direction. Even in this case, because the horizontal pipe section 14 and the floor slab 6 are connected by the first support section 46, the tip end of the horizontal pipe section 14 is prevented from displacing in the vertical direction, and the leg joint 12 can be more easily accommodated in the space below the floor slab 6 located immediately above the horizontal pipe section 14 (improving the fit of the leg joint 12). The drainage structure 11 is provided with 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. This can improve the strength of the drainage structure 11 against vibration and impact.

[0038] Furthermore, according to the construction method S of the drainage structure of this embodiment, by filling the space between the vertical pipe 37 and the floor slab 6 with filler material 7, it is possible to more reliably prevent the vertical pipe section 13 to which the vertical pipe 37 is connected from shaking.

[0039] The drainage structure 11 of this embodiment can have its configuration modified in various ways as described below. 5, a so-called two-rod 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 protrusions 62b and 62c. The main body 62a is formed into a C-shape from, for example, a metal strip-shaped member. The inner diameter of the main body 62a and the outer diameter of the horizontal pipe portion 14 of the leg joint 12 are approximately the same. The protrusion 62b protrudes radially outward from a first circumferential end of the main body 62a. The protrusion 62c protrudes radially outward from a second circumferential end of the main body 62a. Each of the protrusions 62b and 62c has a through-hole (not shown) that penetrates in the up-down direction.

[0040] 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 identically to the main body 62a and 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 protrusions 62b and 63b, respectively, and fixed to the protrusions 62b and 63b by a nut 54. The lower end of the other rod 48 is inserted into the through holes of the protrusions 62c and 63c, respectively, and fixed to the protrusions 62c and 63c by a nut 54. A pair of anchors 49 are provided on the first support portion 61. The female threads of each anchor 49 are fitted with the male threads at the upper end of the rod 48, respectively. The horizontal pipe portion 14 of the leg joint 12 and the floor slab 6 can also be connected by the first support portion 61 configured as described above.

[0041] 6 and 7, a second support portion 66 and a third support portion 71 may be provided instead of the leg joint 12, the stand pipe 37, the horizontal pipe 39, and the second support portion 51 of the drainage structure 11A of the present embodiment. In this modification, the stand pipe portion 13 is formed with a stand pipe connecting portion 18A that is a flange. 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.

[0042] 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 and 68 are configured similarly to the support pieces 62 and 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.

[0043] In this modification, the lower end of the standpipe 36 is connected to the standpipe connecting portion 18A of the standpipe portion 13. The third support portion 71 is a so-called single-hanging 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.

[0044] In the drainage structure 11B configured in this manner, 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, 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 for 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.

[0045] 8 and 9, a drainage structure 11C of a third modified example may be provided with a second support portion 76 instead of the second support portion 66 of the drainage structure 11B of the modified example. 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 standing pipe portion 13 is disposed within the through-hole 6 a of the floor slab 6 , and the upper end of the standing 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 fitting 77, a rod 53, and an anchor 55. The support fitting 77 has a known configuration and can be attached to and detached from the upper end of the vertical pipe portion 13. 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.

[0046] (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 a description thereof will be omitted. Only the differences will be described. 10 and 11, the drainage structure 81 of this embodiment includes each component of the drainage structure 11B of the second modified example of the first embodiment, as well as a pair of lid bodies 85. Note that Fig. 11 also shows the upper part of the drainage structure 81, etc. An opening 15b that penetrates the side wall 15a in the radial direction is formed in the side wall 15a of the curved pipe portion 15. A pair of openings 15b are formed on either side of the central axis of the curved pipe portion 15. A flange 82 that protrudes radially outward is attached to the peripheral edge of the opening 15b of the side wall 15a. The flange 82 is disposed around the entire periphery of this peripheral edge. A plurality of bolt holes (not shown) are formed in the flange 82. In this embodiment, the horizontal pipe 40 does not need to be fire-resistant, and therefore the horizontal pipe 40 is made of a resin such as polyvinyl chloride.

[0047] As shown in FIG. 12, the lid body 85 includes an outer lid (restriction 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 the peripheral wall of the outer lid main body 90. The flange 91 protrudes outward from the peripheral wall of the outer lid main body 90 and is provided around the entire periphery of the peripheral wall. The flange 91 has a plurality of through holes (not shown) formed in positions corresponding to the bolt holes of the curved pipe portion 15. The outer lid body 90 and flange 91 that constitute the outer lid 86 are integrally formed from metal such as cast iron.

[0048] 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 have a size that allows it to be placed within the flange 82 of the curved pipe portion 15 (see Figure 11). The bottom wall portion of the inner lid body 93 is curved to a shape that corresponds to the side wall 15a of the curved pipe portion 15. The flange 94 protrudes outward from the peripheral wall of the inner lid main body 93 and is provided around the entire periphery 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. The inner lid body 93 and flange 94 that constitute the inner lid 87 are integrally formed from a synthetic resin such as polyvinyl chloride. The inner lid 87 is arranged 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 .

[0049] The thermal expansion material 88 is made of a rubber-based material or a resin material containing thermally expandable graphite. For example, when the temperature reaches 200°C 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. As shown in Figure 11, the lid body 85 is attached to the curved pipe portion 15 by passing bolts 96 through the through holes of the outer lid 86 and the inner lid 87 and fitting them into the bolt holes of the curved pipe portion 15. The outer lid 86 and the inner lid 87 are attached to the periphery of the opening 15b in the side wall 15a. The lid body 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.

[0050] The outer lid 86 covers the outside of the curved pipe portion 15 in the radial direction relative to the thermal expansion material 88. The outer lid 86 restricts the thermal expansion material 88 from expanding outward in the radial direction of the curved pipe portion 15.

[0051] 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 edge of the opening 15b in the side wall 15a. Therefore, the thermal expansion material 88 expands radially inward, etc., and can narrow the internal space of the curved pipe portion 15. Then, by adjusting the amount of thermal expansion material 88 placed 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 will disappear.

[0052] It is preferable that the distance between the pair of openings 15b is wider than the width of the horizontal pipe portion 14, and that the second support portion 66 supports the vertical pipe portion 13 rather than the curved pipe portion 15 so that the second support portion 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 that the second support portion 66 supports 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.

[0053] 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 have to include the inner lid 87.

[0054] 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 portion 14 may have the same length as the vertical pipe portion 13, or may be shorter than the vertical pipe portion 13. The drainage structure does not necessarily have 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. [Explanation of symbols]

[0055] 1 Multi-story building (building) 6 Floor slab 7 Filling material 11,11A,11B,11C,81 Drainage structure (piping structure) 12 feet and hands 13. Riser 14 transverse tube 15. Curved tube 15a Side wall 15b Opening 36,37 riser 39,40 cross tube 46,61 1st Support Department 51,66,76 Second Support Department 86 Cover (Regulatory Department) 88 Thermal expansion material S Construction method of piping structure S1 Setting up the project S2 Link Engineering S3 connection project S4 filling project

Claims

1. 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.

2. 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.

3. 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:

4. Floor slabs and A collecting joint or a 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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