Expansion joints, piping systems, and buildings

Abstract

To provide an expansion joint that prevents condensation of its outer surface even when there is a shrinkage of a vertical tube or the like disposed inside.SOLUTION: An expansion joint 21 has a first tube material 27, and a hollow part 45 having a hollow layer S1 formed inside, the hollow layer covering the first tube material 27 from outside or inside in radial direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an expansion joint. [Background technology]

[0002] Conventionally, in piping systems for disposing of wastewater from buildings, joints are used to connect a pair of vertical pipes, a pair of horizontal pipes, etc. (See, for example, Patent Document 1). For example, a pair of vertical pipes are connected by placing one of the pair of vertical pipes at one end of the joint and placing the other of the pair of vertical pipes at the other end of the joint. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-109194 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, when drain water (cold condensed water) discharged from an air conditioning system flows inside a vertical pipe, etc., condensation may occur on the outer surfaces of the vertical pipe, etc. and fittings. For this reason, foam layers are provided on the fittings and vertical pipes, etc. to improve the insulating performance of the fittings and vertical pipes, etc., and to prevent condensation on their outer surfaces. However, the axial length of the vertical pipes may shrink due to temperature changes, for example. This causes the length of the vertical pipes inside the joint to change compared to before the shrinkage, which may result in insufficient insulation performance in the portion of the joint where the vertical pipes are not placed. In this case, there is a risk of condensation on the outer surface of this portion.

[0005] The present invention has been made in consideration of these problems, and has as its object to provide an expansion joint that suppresses condensation on the outer surface even when a vertical pipe or the like placed inside shrinks. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention proposes the following means. The expansion joint of the present invention comprises a first pipe member in which an end of a vertical pipe is placed, a hollow portion formed with a hollow layer that covers the first pipe member from the outside or inside in the radial direction, and a locking portion fixed to the inner circumferential surface of the first pipe member, wherein the hollow portion covers the first pipe member from the outside or inside in the radial direction and the hollow layer is formed between the first pipe member and a second pipe member, and a first annular member and a second annular member that are provided at a distance from each other in the axial direction of the first pipe member and close the hollow layer from both sides in the axial direction. the second pipe material covers the first pipe material from the outside in the radial direction, the first annular member is connected to the outer peripheral surface of the first pipe material and contacts the second pipe material, the second annular member is connected to the inner peripheral surface of the second pipe material and contacts the first pipe material, and the hollow layer is arranged in the axial direction of the first pipe material to include the range of the locking portion and extends toward the vertical pipe beyond the locking portion, so that a portion of the hollow layer overlaps the vertical pipe. According to this invention, an expansion joint is constructed by placing a vertical pipe or the like having a foam layer within each axial end of a first pipe material. Thereafter, a hollow layer is placed so that when the vertical pipe or the like shrinks axially from a predetermined length, it includes the range in the axial direction between the end of the vertical pipe or the like before the length change and the end after the change. Generally, the insulating performance of the hollow layer is higher than that of the foam layer and the pipe material, so even if the vertical pipe or the like shrinks and the foam layer disappears inside the expansion joint, condensation on the outer surface of the expansion joint can be suppressed. Furthermore, a hollow layer can be formed by the second pipe, the first annular member, and the second annular member.

[0007] Another expansion joint of the present invention comprises a first pipe material inside which an end of a vertical pipe is placed, a hollow section having a hollow layer formed inside which covers the first pipe material from the radial inside, and a locking section fixed to the inner surface of the first pipe material, wherein the first pipe material and the hollow section are each made of a transparent resin, and the hollow layer is positioned closer to the vertical pipe than the locking section in the axial direction of the first pipe material, and extends toward the vertical pipe than the locking section, so that a portion of the hollow layer overlaps the vertical pipe. According to this invention, an expansion joint is constructed by placing a vertical pipe or the like having a foam layer within each axial end of a first pipe material. Thereafter, a hollow layer is placed so that when the vertical pipe or the like shrinks axially from a predetermined length, it includes the range in the axial direction between the end of the vertical pipe or the like before the length change and the end after the change. Generally, the insulating performance of the hollow layer is higher than that of the foam layer and the pipe material, so even if the vertical pipe or the like shrinks and the foam layer disappears inside the expansion joint, condensation on the outer surface of the expansion joint can be suppressed. Furthermore, the positions of the vertical pipes and the like arranged inside the first pipe can be visually confirmed from outside the expansion joint by passing through the first pipe and the hollow portion.

[0008] Furthermore, in the above expansion joint, the hollow portion may include a second pipe material that covers the first pipe material from the outside or inside in the radial direction and has the hollow layer formed between it and the first pipe material, and a first annular member and a second annular member that are spaced apart from each other in the axial direction of the first pipe material and block the hollow layer from both sides in the axial direction. According to this invention, the hollow layer can be formed by the second pipe, the first annular member, and the second annular member.

[0009] Furthermore, in the above expansion joint, the second pipe material may cover the first pipe material from the radially inside, and the first annular member and the second annular member may each be connected to the outer circumferential surface of the second pipe material and each be in contact with the first pipe material. According to this invention, a hollow layer can be formed by the first pipe, the second pipe, the first annular member, and the hollow portion connecting the second annular member.

[0010] Furthermore, in the above expansion joint, the hollow portion has a pair of divided bodies that cover the first pipe material from the outside in the radial direction, and each of the divided bodies comprises a tubular piece formed by circumferentially dividing a second pipe material having the hollow layer formed between it and the first pipe material, a first annular member piece formed in a semicircular ring shape and extending from a first end of the tubular piece toward the inside in the radial direction, and a second annular member piece formed in a semicircular ring shape and extending from a second end of the tubular piece toward the inside in the radial direction, and the hollow layer may be formed between the pair of tubular pieces and the first pipe material. Furthermore, in the above expansion joint, each of the divided bodies may comprise a first flange protruding from the radially inner end of the first annular member piece toward the opposite side to the second annular member piece, and a second flange protruding from the radially inner end of the second annular member piece toward the opposite side to the first annular member piece, and each of the divided bodies may be integrally formed from resin, and each of the divided bodies may be fixed to the first pipe material. [Effects of the Invention]

[0011] According to the expansion joint of the present invention, even if a vertical pipe or the like arranged inside contracts, condensation on the outer surface can be suppressed. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a longitudinal sectional view of a piping system in which an expansion joint according to a first embodiment of the present invention is used. [Figure 2] FIG. 2 is an enlarged view of part A in FIG. [Figure 3] FIG. 10 is a longitudinal sectional view of a piping system in which an expansion joint according to a modified example of the first embodiment of the present invention is used. [Figure 4] FIG. 10 is a longitudinal sectional view of a piping system in which an expansion joint according to a modified example of the first embodiment of the present invention is used. [Figure 5] FIG. 10 is a longitudinal sectional view of a piping system in which an expansion joint according to a second embodiment of the present invention is used. [Figure 6]FIG. 10 is a longitudinal sectional view of a piping system in which an expansion joint according to a third embodiment of the present invention is used. [Figure 7] FIG. 10 is a longitudinal sectional view of a piping system in which an expansion joint according to a fourth embodiment of the present invention is used. [Figure 8] FIG. 10 is a perspective view of an expansion joint according to a fifth embodiment of the present invention. [Figure 9] FIG. 2 is a longitudinal cross-sectional view of the expansion joint. DETAILED DESCRIPTION OF THE INVENTION

[0013] (First embodiment) A piping system in which a first embodiment of an expansion joint according to the present invention is used will be described below with reference to FIGS. 1, a piping system 1 is used in, for example, a building 11. An air conditioning device (not shown) is connected to the piping system 1, and the piping system 1 discharges drain water generated by the air conditioning device to the outside of the building 11. The piping system 1 includes the expansion joint 21 of this embodiment, a first vertical pipe (vertical pipe) 61, and a second vertical pipe (vertical pipe) 66. First, the vertical pipes 61 and 66 will be described below.

[0014] The first vertical pipe 61 includes, for example, a non-foamed inner layer 62, a foamed layer 63, and a non-foamed outer layer 64. The non-foamed inner layer 62, the foamed layer 63, and the non-foamed outer layer 64 are each formed in a tubular shape and are arranged coaxially with one another. The foamed layer 63 is fixed to the outer peripheral surface of the non-foamed inner layer 62. The non-foamed outer layer 64 is fixed to the outer peripheral surface of the foamed layer 63. The non-foamed inner layer 62 and the non-foamed outer layer 64 are formed without foaming the vinyl chloride resin. The foamed layer 63 is formed by foaming a thermoplastic resin composition for a foamed layer, which contains a resin including a vinyl chloride resin and a foaming agent. The configuration of the first vertical pipe 61 is not limited to this, and the first vertical pipe may be configured by providing a heat insulating material on the outer peripheral surface of a vertical pipe formed without foaming resin. The second vertical pipe 66 is provided with a non-foamed inner layer 67 , a foamed layer 68 , and a non-foamed outer layer 69 , which are configured similarly to the non-foamed inner layer 62 , the foamed layer 63 , and the non-foamed outer layer 64 of the first vertical pipe 61 .

[0015] The expansion joint 21 includes a pipe body 26 , a first cap 41 , and a second cap 51 . The pipe main body 26 includes a first pipe material 27, a first annular member 28, a second pipe material 29, a locking portion 30, and a holding portion 31. The first pipe material 27 is formed in a circular pipe shape. The first pipe material 27 is arranged so that the axial direction of the first pipe material 27 is along the vertical direction Z. However, the arrangement of the first pipe material 27 is not limited to this, and the first pipe material 27 may be arranged so that the axial direction of the first pipe material 27 intersects with the vertical direction Z.

[0016] The inner diameter of the first pipe material 27 is constant regardless of the position in the vertical direction Z. The inner diameter of the first pipe material 27 and the outer diameters of the vertical pipes 61, 66 are approximately the same. 1 and 2, the outer diameter of the first tubular member 27 is larger at its upper end (the other axial side) Z2 than at its lower end (one axial side) Z1. As a result, a step 27a is formed on the outer peripheral surface of the first tubular member 27 in the middle in the up-down direction Z. It is preferable that the step 27a is formed around the entire circumference of the first tubular member 27. 1, a plurality of protrusions 27b are formed on the outer peripheral surface of the first tubular member 27 above the step portion 27a in a direction Z2, protruding radially outward from the first tubular member 27. The plurality of protrusions 27b are spaced apart from one another in the vertical direction Z.

[0017] The distance between the multiple protrusions 27b is set so that the expansion joint 21 can be gripped by a support (shown by two-dot chain lines D in FIG. 1) equipped with a gripping portion for fixing the expansion joint 21 to the wall surface. The gripping portion of the support D grips the outer surface of the first pipe material 27 between the protrusions 27b, and the gripping portion abuts against the side surface of the protrusions 27b, thereby fixing the expansion joint 21 so that it does not follow the expansion and contraction of the first vertical pipe 61.

[0018] The first annular member 28 is formed in a circular ring shape. The first annular member 28 is arranged coaxially with the first tubular member 27 in the vertical direction Z, in a portion between the step portion 27a and the plurality of protrusions 27b on the outer peripheral surface of the first tubular member 27. The inner peripheral edge of the first annular member 28 is connected to the outer peripheral surface of the first tubular member 27. The second pipe member 29 is formed in a cylindrical shape. The second pipe member 29 is arranged coaxially with the first pipe member 27 and covers the middle portion of the first pipe member 27 in the up-down direction Z from the radially outer side. The second pipe member 29 is spaced radially outward from the first pipe member 27. The second pipe member 29 extends downward Z1 from the radially outer end of the first annular member 28. As shown in FIG. 2 , the end of the second pipe member 29 in the downward Z1 direction is arranged above the step portion 27a of the first pipe member 27 at a position Z2 above. A first locking portion 29a protruding radially outward is formed on the outer peripheral surface of the lower end portion of the second pipe member 29. It is preferable that the first locking portion 29a is formed around the entire circumference of the second pipe member 29.

[0019] 1, the locking portion 30 is formed in an annular shape. The inner diameter of the locking portion 30 and the inner diameter of the first vertical pipe 61 are approximately the same. The locking portion 30 is disposed coaxially with the first pipe 27 within the first pipe 27. The outer peripheral edge of the locking portion 30 is fixed to the inner peripheral surface of the first pipe 27. The lower surface of the locking portion 30 is formed flat and is disposed along a horizontal plane. On the other hand, the upper surface of the locking portion 30 is gradually inclined downward Z1 as it approaches the axis of the first pipe 27. As shown in FIG. 2, in the vertical direction Z, the lower surface of the locking portion 30 and the end of the second pipe member 29 on the lower side Z1 are aligned with each other.

[0020] As shown in Fig. 1, the holding portion 31 is formed in a cylindrical shape. The holding portion 31 is arranged coaxially with the first pipe material 27 so as to cover the upper end portion of the first pipe material 27 from the outside in the radial direction. The lower end portion of the holding portion 31 is fixed to the outer peripheral surface of the upper end portion of the first pipe material 27. The upper end portion of the holding portion 31 protrudes upward Z2 beyond the first pipe material 27. A second locking portion 31a protruding radially outward is formed on the outer peripheral surface of the upper end of the holding portion 31. It is preferable that the second locking portion 31a is formed around the entire circumference of the holding portion 31. The pipe body 26 configured as above is integrally formed without foaming vinyl chloride resin, etc. In this case, the color of the pipe body 26 is colored gray, black, etc.

[0021] A first sealing member 33 is held on the radially inner side of the upper end of the holding portion 31. The first sealing member 33 is formed in an annular shape and is arranged coaxially with the holding portion 31. In a natural state where no external force is applied to the first sealing member 33, the inner diameter of the first sealing member 33 is smaller than the inner diameter of the first pipe material 27. The first sealing member 33 is formed of, for example, a resin that is softer than the pipe main body 26. The first sealing member 33 is disposed above the first pipe member 27 at Z2.

[0022] The first cap 41 includes a second annular member 42 and a first peripheral wall portion 43. The second annular member 42 is formed in an annular shape and is arranged coaxially with the first pipe 27. The second annular member 42 is spaced downward Z1 from the first annular member 28. In a natural state where no external force is acting on the second annular member 42, the upper surface of the second annular member 42 is formed flat and is arranged along a horizontal plane. In Figure 2, the shape of the upper surface of the second annular member 42 in its natural state is indicated by a two-dot chain line. A recess 42a recessed upward Z2 is formed on the inner peripheral edge of the lower surface of the second annular member 42. The recess 42a opens radially inward. By forming the recess 42a in the second annular member 42, a thin-walled portion 42b is formed on the inner peripheral edge of the second annular member 42. The thin-walled portion 42b has a shorter length in the up-down direction Z (a thinner thickness) than the other portions of the second annular member 42 other than the inner peripheral edge. The thin-walled portion 42b is more easily deformed in the up-down direction Z than the other portions of the second annular member 42. The thin-walled portion 42b is formed on the upper surface of the inner peripheral edge of the second annular member 42. It is preferable that the thin-walled portion 42b is formed around the entire circumference of the second annular member 42. The inner diameter of the second annular member 42 and the outer diameter of the lower end portion Z1 below the step portion 27a of the first pipe 27 are approximately the same. The outer diameter of the thin-walled portion 42b is larger than the outer diameter of the upper end portion Z2 above the step portion 27a of the first pipe 27.

[0023] 1 and 2, the first circumferential wall portion 43 is formed in a cylindrical shape and is disposed coaxially with the second annular member 42. The first circumferential wall portion 43 extends upward Z2 from the outer peripheral edge of the second annular member 42. The inner diameter of the first circumferential wall portion 43 is larger than the outer diameter of the second tubular member 29. A first locked portion 43a protruding radially inward is formed on the inner circumferential surface of the upper end portion of the first circumferential wall portion 43. The first locked portion 43a is preferably formed around the entire circumference of the holding portion 31. The inner diameter of the first locked portion 43a and the outer diameter of the second pipe material 29 are approximately the same. The first cap 41 configured as described above is integrally formed from a resin such as polypropylene (PP). The first cap 41 may also be formed from a resin such as polyethylene (PE), acrylonitrile-butadiene-styrene (ABS), or vinyl chloride.

[0024] The first cap 41 is fitted onto the lower end of the second pipe material 29 of the pipe main body 26. More specifically, the second annular member 42 of the first cap 41 contacts the lower surface of the second pipe material 29 from a point Z1 below the lower surface. The thin-walled portion 42b of the second annular member 42 contacts the step 27a of the first pipe material 27 from a point Z1 below the step 27a. Because the step 27a is positioned Z1 below the lower end of the second pipe material 29, the inner peripheral edge side of the second annular member 42 bends downward Z1, and the elastic force of the second annular member 42 causes the thin-walled portion 42b to make strong contact with the step 27a. This improves the airtightness between the step 27a of the first pipe 27 and the thin-walled portion 42b of the first cap 41. Furthermore, even if the shape of the first cap 41 is distorted, the step 27a and the thin-walled portion 42b can be reliably brought into contact with each other. Because the thin-walled portion 42b is more easily deformed than the other portions of the second annular member 42, the thin-walled portion 42b can be easily deformed.

[0025] The first peripheral wall portion 43 of the first cap 41 is disposed coaxially with the second tubular material 29 and covers the second tubular material 29 from the outside in the radial direction. As shown in Fig. 2, the first locked portion 43a of the first peripheral wall portion 43 is locked to the first locking portion 29a of the second tubular material 29 from above Z2 of the first locking portion 29a. In this way, the first cap 41 is fitted onto the lower end of the second pipe 29 .

[0026] As shown in FIG. 1, the first annular member 28, the second pipe material 29, and the second annular member 42 of the first cap 41 that constitute the pipe main body 26 define a hollow section 45 having a hollow layer S1 formed therein that covers the first pipe material 27 from the outside in the radial direction. The hollow layer S1 is formed between the first pipe material 27 and the second pipe material 29. The annular members 28, 42 close the hollow layer S1 from both sides in the vertical direction Z. The hollow layer S1 is formed of a fluid (gas) such as air. The hollow section 45 (hollow layer S1) is formed in an annular shape around the entire circumference of the first pipe material 27. The hollow layer S1 covers the middle portion of the first pipe material 27 in the vertical direction Z. In general, the insulating performance of the hollow layer is higher than that of the foam layer of a pipe made of resin or metal, and the insulating performance of the pipe material. The upper end of the hollow layer S1 extends to Z2 above the upper surface of the locking portion 30. As shown in Fig. 2, in the vertical direction Z, the lower end of the hollow layer S1 and the lower surface of the locking portion 30 are substantially aligned with each other.

[0027] As shown in FIG. 1, the second cap 51 includes a third annular member 52 and a second circumferential wall portion 53. The third annular member 52 is formed in an annular shape and is disposed coaxially with the first pipe member 27. The inner diameter of the third annular member 52 and the outer diameter of the second vertical pipe 66 are approximately the same. The second peripheral wall portion 53 is formed in a cylindrical shape and is disposed coaxially with the third annular member 52. The second peripheral wall portion 53 extends downward Z1 from the outer peripheral edge of the third annular member 52. The inner diameter of the second peripheral wall portion 53 is larger than the outer diameter of the holding portion 31. A second locked portion 53a protruding radially inward is formed on the inner peripheral surface of the lower end portion of the second peripheral wall portion 53. The second locked portion 53a is preferably formed around the entire circumference of the second peripheral wall portion 53. The inner diameter of the second locked portion 53a and the outer diameter of the holding portion 31 are approximately the same. The second cap 51 configured as above is integrally formed with the first cap 41 using the same material.

[0028] The second cap 51 is fitted onto the upper end of the holding portion 31 of the tube body 26 . More specifically, the third annular member 52 of the second cap 51 contacts the upper surface of the holding portion 31 from above Z2 of this upper surface. The second peripheral wall portion 53 of the second cap 51 is disposed coaxially with the holding portion 31 and covers the holding portion 31 from the outside in the radial direction. The second locked portion 53a of the second peripheral wall portion 53 is locked to the second locking portion 31a of the holding portion 31 from below Z1 of the second locking portion 31a. In this way, the second cap 51 is fitted onto the upper end of the holding portion 31 .

[0029] An annular second sealing member 56 is disposed within the first pipe 27 below the locking portion 30 at a position Z1 below the locking portion 30. The inner and outer diameters of the second sealing member 56 are approximately the same as those of the first vertical pipe 61. The second sealing member 56 is formed from the same material as the first sealing member 33. The second sealing member 56 contacts the lower surface of the locking portion 30 from a position Z1 below the locking portion 30. The first vertical pipe 61 is disposed so that its axis extends along the vertical direction Z. The upper end of the first vertical pipe 61 is disposed within the lower end of the first pipe 27. The first vertical pipe 61 contacts the second sealing member 56 from a position Z1 below the second sealing member 56. The first vertical pipe 61 is locked to the locking portion 30 via the second sealing member 56, thereby restricting upward movement of the first vertical pipe 61 relative to the pipe main body 26. The second sealing member 56 provides a watertight seal between the locking portion 30 and the first vertical pipe 61. In addition, in the vertical direction Z, the lower end of the hollow layer S1 may extend downward Z1 to a position equivalent to the lower end of the second sealing member 56 or to a position Z1 below the lower end of the second sealing member 56. Furthermore, the second sealing member 56 does not necessarily have to be provided in the expansion joint 21.

[0030] The second vertical pipe 66 is arranged so that its axis is along the vertical direction Z. The lower end of the second vertical pipe 66 is arranged within the upper end of the first pipe material 27. When the second vertical pipe 66 is arranged within the first sealing member 33, the first sealing member 33 elastically deforms, increasing the inner diameter of the first sealing member 33, and creating a watertight seal between the first sealing member 33 and the second vertical pipe 66. The lower end of the second vertical pipe 66 is disposed in the middle of the hollow layer S1 in the vertical direction Z. The lower end of the second vertical pipe 66 and the lower end of the hollow layer S1 are spaced apart by a distance L1 in the vertical direction Z. The lower end of the second vertical pipe 66 and the upper end of the hollow layer S1 are spaced apart by a distance L2 in the vertical direction Z. The distance L1 is set so that even if the constructed second vertical pipe 66 expands in the vertical direction Z, the second vertical pipe 66 will not come into contact with the locking portion 30. On the other hand, the distance L2 is set so that even if the constructed second vertical pipe 66 contracts in the vertical direction Z, the lower end of the second vertical pipe 66 will not be positioned Z2 above the upper end of the hollow layer S1. In other words, the hollow layer S1 is positioned in the vertical direction Z so as to include the range between the lower end of the second vertical pipe 66 before the length changes and the lower end after the change.

[0031] In the piping system 1 constructed as described above, even if the second vertical pipe 66 contracts in the vertical direction Z after construction and moves upward Z2 relative to the pipe main body 26, as long as the movement distance is equal to or less than the distance L2, there will be an overlapping portion of the second vertical pipe 66 and the hollow layer S1 in the vertical direction Z. Therefore, even if cold drain water flows through the piping system 1, the heat of the drain water is less likely to be transferred to the outer surface of the expansion joint 21, and condensation is less likely to form on the outer surface of the expansion joint 21. On the other hand, even if the second vertical pipe 66 extends in the up-down direction Z after installation and moves downward Z1 relative to the pipe main body 26, as long as the moving distance is equal to or less than the distance L1, the second vertical pipe 66 will not come into contact with the locking portion 30 of the pipe main body 26. Therefore, the second vertical pipe 66 is prevented from coming into contact with the locking portion 30 and causing stress to act on the second vertical pipe 66.

[0032] As described above, according to the expansion joint 21 of this embodiment, the vertical pipes 61, 66 are disposed within each end of the first pipe member 27 in the up-down direction Z. In this case, the hollow layer S1 is disposed so that, when the second vertical pipe 66 contracts in the up-down direction Z from a predetermined length, it includes the range in the up-down direction Z between the lower end of the second vertical pipe 66 before the length changes and the lower end after the change. Generally, the insulating performance of the hollow layer is higher than that of the foam layer and the insulating performance of the pipe member. Therefore, even if the second vertical pipe 66 contracts and the foam layer 68 of the second vertical pipe 66 disappears inside the expansion joint 21, condensation on the outer surface of the expansion joint 21 can be suppressed. Since the hollow portion 45 comprises the first annular member 28, the second tubular material 29, and the second annular member 42, the first annular member 28, the second tubular material 29, and the second annular member 42 can form a hollow layer S1.

[0033] The first pipe member 27 and hollow portion 45 constituting the expansion joint 21 may each be transparent. Here, "transparent" includes colorless transparent and colored transparent. In this case, the expansion joint 21 can be formed from acrylic resin, polycarbonate resin, or the like. By configuring the expansion joint 21 in this modified example, the positions of the vertical pipes 61, 66 arranged within the first pipe material 27 can be seen from outside the expansion joint 21 through the first pipe material 27 and the hollow portion 45, respectively. The first cap 41, the locking portion 30, etc. do not have to be transparent.

[0034] As in the expansion joint 21A of the piping system 1A shown in Fig. 3, a first cap 76 may be provided instead of the first cap 41 of the expansion joint 21 of this embodiment. Note that in this modification, the second pipe 29 does not have a first locking portion 29a formed thereon. The first cap 76 includes a second annular member 77 , a first circumferential wall portion 78 , and a third circumferential wall portion 79 . The second annular member 77 is formed in a circular ring shape like the second annular member 42, and is arranged coaxially with the first pipe 27. The outer diameter of the second annular member 77 and the outer diameter of the second pipe 29 are approximately the same. The inner peripheral edge of the second annular member 77 contacts the step 27a of the first pipe 27 from below Z1 of the step 27a.

[0035] The peripheral wall portions 78, 79 are each formed in an annular shape and are arranged coaxially with the second annular member 77. The first peripheral wall portion 78 is fixed to the inner peripheral edge portion on the upper surface of the second annular member 77. The inner diameter of the first peripheral wall portion 78 and the outer diameter of the portion Z2 above the step portion 27a of the first tubular member 27 are approximately the same. The first peripheral wall portion 78 contacts the outer peripheral surface of the first tubular member 27 above the step portion 27a. The third circumferential wall portion 79 is fixed to a radially middle portion of the upper surface of the second annular member 77 so as to cover the radially outer side of the first circumferential wall portion 78. The outer diameter of the third circumferential wall portion 79 and the inner diameter of the second tubular member 29 are approximately the same. The outer peripheral surface of the third circumferential wall portion 79 contacts the inner peripheral surface of the second tubular member 29. The first cap 76 is made of the same material as the first cap 41 .

[0036] The pipe members 27, 29 and the first cap 76 are fixed to each other by a connecting portion (not shown) formed with a known adhesive or pressure-sensitive adhesive. The first annular member 28 and the second pipe member 29 constituting the pipe main body 26, and the second annular member 77 of the first cap 76 form a hollow portion 81 having a hollow layer S2 formed therein that covers the first pipe member 27 from the outside in the radial direction.

[0037] The expansion joint 21A of the modified example configured in this manner can also achieve the same effects as the expansion joint 21 of the present embodiment. Furthermore, by connecting the pipes 27, 29 and the first cap 76 at the connecting portion, the airtightness between the pipes 27, 29 and the first cap 76 can be improved.

[0038] Moreover, like an expansion joint 21B of a piping system 1B shown in FIG. 4, a foam material (second annular member) 86 may be provided instead of the first cap 76 of the expansion joint 21A of the modified example. In this modified example, a step 29b is formed on the inner peripheral surface of the second tubular member 29. The inner diameter of a portion Z1 below the step 29b of the second tubular member 29 is larger than the inner diameter of a portion Z2 above the step 29b of the second tubular member 29. The step 29b and the step 27a of the first tubular member 27 are located at the same position in the vertical direction Z.

[0039] The foam material 86 is formed in an annular shape and is arranged coaxially with the first pipe member 27. The foam material 86 is made of a non-breathable foam material such as foamed polyethylene or foamed rubber. The foam material 86 is arranged between the first pipe member 27 and the second pipe member 29. The foam material 86 is engaged with the step portions 27a, 29b from below Z1 of the step portions 27a, 29b. The lower surface of the foam material 86 and the lower end surface of the second pipe member 29 are flush with each other. The pipes 27 and 29 and the foam material 86 are fixed to each other by the aforementioned connecting portions (not shown).

[0040] The first annular member 28, the second pipe material 29, and the foam material 86 that make up the pipe main body 26 form a hollow portion 88 in which a hollow layer S3 that covers the first pipe material 27 from the outside in the radial direction is formed. The expansion joint 21B of the modified example configured in this manner can also achieve the same effects as the expansion joint 21 of the present embodiment.

[0041] (Second embodiment) Next, a second embodiment of the present invention will be described with reference to Fig. 5. The same components as those in the previous embodiment are designated by the same reference numerals, and their description will be omitted, with only the differences being described. As shown in Fig. 5, an expansion joint 91 of this embodiment used in a piping system 2 includes a first pipe body 96, a second pipe body 106, and a second cap 51.

[0042] The first pipe body 96 includes a first pipe member 27 , a first annular member 98 , and a first spacer 99 . The first annular member 98 is formed in an annular shape and is arranged coaxially with the first pipe 27. The first annular member 98 extends radially outward from a middle portion in the up-down direction Z on the outer circumferential surface of the first pipe 27. The first annular member 98 is connected to the first pipe 27. The first spacer 99 is formed in a cylindrical shape and is disposed coaxially with the first pipe member 27. The first spacer 99 extends upward Z2 from a radially intermediate portion on the upper surface of the first annular member 98. A gap is formed between the first spacer 99 and the first pipe member 27 in the radial direction.

[0043] The second pipe body 106 includes a second pipe member 107 , a second annular member 108 , and a holding portion 109 . The second pipe 107 is formed in a cylindrical shape and is arranged coaxially with the first pipe 27. The second pipe 107 covers the first pipe 27 from the outside in the radial direction. The inner diameter of the second pipe 107 and the outer diameter of the first spacer 99 are approximately the same. The outer diameter of the second pipe 107 and the outer diameter of the first annular member 98 are approximately the same. The first spacer 99 is fitted inside the second pipe 107, and the lower end of the second pipe 107 contacts the upper surface of the first annular member 98. The second annular member 108 is formed in an annular shape and is arranged coaxially with the second tubular member 107. The second annular member 108 extends radially inward from the inner circumferential surface at the upper end of the second tubular member 107. The second annular member 108 is connected to the upper end of the second tubular member 107. The inner diameter of the second annular member 108 and the inner diameter of the first tubular member 27 are approximately the same. The lower surface of the second annular member 108 contacts the upper end of the first tubular member 27 from above Z2 of the first tubular member 27. The second annular member 108 is arranged so as to be spaced apart from the first annular member 98 above Z2.

[0044] The first pipe body 96 and the second pipe body 106 are fixed to each other by the aforementioned connecting portion (not shown). The first annular member 98 constituting the first pipe body 96, and the second pipe material 107 and second annular member 108 constituting the second pipe body 106 form a hollow portion 111 inside which a hollow layer S5 is formed that covers the first pipe material 27 from the radial outside. The second pipe member 107, the first annular member 98, and the second annular member 108, together with the first pipe member 27, surround the hollow layer S5.

[0045] The holding portion 109 is formed in an annular shape and is fixed to the upper surface of the second annular member 108. The first sealing member 33 is held on the inner peripheral surface of the holding portion 109. The outer peripheral surface of the holding portion 109 is formed with a second locking portion 109a configured similarly to the second locking portion 31a of the holding portion 31. The second cap 51 is fitted onto the upper end of the holding portion 109 of the second tube body .

[0046] As described above, according to the expansion joint 91 of this embodiment, even if the vertical pipes 61, 66 arranged inside contract, condensation on the outer surface can be suppressed. Furthermore, a hollow layer S5 can be formed by a first pipe body 96 connecting the first pipe material 27 and the first annular member 98, and a second pipe body 106 connecting the second pipe material 107 and the second annular member 108.

[0047] (Third embodiment) Next, a third embodiment of the present invention will be described with reference to Fig. 6. The same components as those in the previous embodiment are designated by the same reference numerals, and their description will be omitted, with only the differences being described. As shown in Fig. 6, the expansion joint 116 of this embodiment used in the piping system 3 includes a pipe main body 121, a hollow portion 131, and a second cap 51.

[0048] The pipe body 121 includes a first pipe member 122, a third annular member 123, and a third pipe member . The first pipe material 122 is formed in a circular pipe shape. The first pipe material 122 is arranged so that the axial direction of the first pipe material 122 is along the up-down direction Z. Note that the orientation in which the first pipe material 122 is arranged is not limited to this. A second locking portion 122a configured similarly to the second locking portion 31a of the holding portion 31 is formed on the outer circumferential surface of the upper end portion of the first pipe member 122. The third annular member 123 is formed in an annular shape and is disposed coaxially with the first pipe member 122. The third annular member 123 protrudes from the lower end of the first pipe member 122 toward the inside in the radial direction. The third pipe 124 is formed in a circular pipe shape and is arranged coaxially with the third annular member 123. The third pipe 124 extends downward Z1 from the inner peripheral edge of the third annular member 123. The inner diameter of the third pipe 124 and the outer diameter of the first vertical pipe 61 are approximately the same.

[0049] The hollow portion 131 includes a second pipe member 132, a first annular member 133, and a second annular member . The second pipe member 132 is formed in a cylindrical shape and is arranged coaxially with the first pipe member 122. The second pipe member 132 covers the first pipe member 122 from the radially inside. The inner diameter of the second pipe member 132 and the outer diameter of the second vertical pipe 66 are approximately the same. The first annular member 133 is formed in an annular shape and is arranged coaxially with the second pipe member 132. The first annular member 133 protrudes radially outward from the outer peripheral surface of the lower end of the second pipe member 132. The first annular member 133 is connected to the second pipe member 132. The first annular member 133 contacts the inner peripheral surface of the first pipe member 132 from the radially inner side. The second annular member 134 is formed in an annular shape and is arranged coaxially with the second pipe 132. The second annular member 134 protrudes radially outward from the outer circumferential surface of the upper end of the second pipe 132. The second annular member 134 is connected to the second pipe 132. The second annular member 134 is arranged so as to be spaced upward Z2 from the first annular member 133. The second annular member 134 contacts the inner circumferential surface of the first pipe 122 from the inside in the radial direction. The upper end of the second annular member 134 is arranged below Z1 the upper end of the first pipe 122 of the pipe main body 121.

[0050] The cross section of the hollow portion 131 including the axis of the first pipe member 122 is formed into a C-shape that is open radially outward. The second pipe member 132, the first annular member 133, and the second annular member 134 that constitute the hollow portion 131 form a hollow layer S7 therein that covers the first pipe member 122 from the inside in the radial direction. The pipe body 121 and the hollow portion 131 may or may not be fixed to each other by the above-mentioned connecting portion.

[0051] A first sealing member 33 is held radially inside the first pipe member 122 and above the hollow portion 131 at Z2. The second cap 51 is fitted onto the upper end of the first pipe member 122 of the pipe body 121 .

[0052] As described above, according to the expansion joint 116 of this embodiment, even if the vertical pipes 61, 66 arranged inside contract, condensation on the outer surface can be suppressed. Furthermore, the first pipe material 122 of the pipe main body 121 and the hollow portion 131 that connects the second pipe material 132, the first annular member 133, and the second annular member 134 together can form a hollow layer S7.

[0053] (Fourth embodiment) Next, a fourth embodiment of the present invention will be described with reference to Fig. 7. The same components as those in the previous embodiment are designated by the same reference numerals, and their description will be omitted, with only the differences being described. As shown in Fig. 7, this piping system 4 includes vertical pipes 61, 66, an expansion joint 141 of this embodiment, and a drain trap 151.

[0054] The expansion joint 141 is configured such that, in the expansion joint 21 of the first embodiment, the end of the lower Z1 of the second pipe 29 extends to near the end of the lower Z1 of the first pipe 27. The hollow layer S1 extends below the locking portion 30 to the lower Z1. The upper end of a connecting pipe (vertical pipe) 146 is disposed within the lower end of the first pipe member 27 of the expansion joint 141. The connecting pipe 146 is a drainage pipe made of resin and not provided with a foam layer.

[0055] The configuration of drain trap 151 is not particularly limited as long as it can prevent backflow of drain water. For example, drain trap 151 includes a trap body 152, a lid portion 153, a trap portion 154, a reduced diameter portion 155, and an upper receiving port 156. The lid portion 153, the trap portion 154, and a connecting member 159 (described later) constitute a trap unit 157. The upper socket 156, the reduced diameter portion 155, and the trap body 152 are arranged in this order from the upper side Z2 to the lower side Z1.

[0056] The trap body 152 is formed in a cylindrical shape extending along the vertical direction Z. An opening 152a is formed on the side surface of the trap body 152, penetrating the trap body 152 in the radial direction. The lid portion 153 is formed in a cylindrical shape with a bottom. The lid portion 153 is disposed so that the bottom wall portion faces inward in the radial direction, and is fitted into the opening 152a of the trap body 152. The lid portion 153 is detachably attached to the opening 152 a of the trap body 152 to seal the opening 152 a of the trap body 152 . The trap portion 154 is disposed within the trap body 152 at a distance from the inner circumferential surface of the trap body 152. The trap portion 154 is a funnel-shaped receiving vessel made of a flexible material such as silicone rubber.

[0057] The trap part 154 is connected to the lid part 153 via a connecting member 159. The connecting member 159 can pass through the opening 152a of the trap main body 152. The reduced diameter portion 155 is provided at the upper end of the trap main body 152. For example, the reduced diameter portion 155 is formed in a cylindrical shape extending along the vertical direction Z. The outer diameter and inner diameter of the reduced diameter portion 155 each gradually increase as they extend upward Z2. Upper socket 156 is provided at the upper end of reduced diameter portion 155. Upper socket 156 is formed in a cylindrical shape and extends upward Z2 from the outer edge of reduced diameter portion 155. Upper socket 156 has a foamed resin layer 156a inside. The inner diameter of the upper socket 156 and the outer diameter of the connecting pipe 146 are equal to each other. The lower end of the connecting pipe 146 is disposed within the upper socket 156.

[0058] A lower socket 160 is provided at the lower end of the trap body 152. The inner diameter of the lower socket 160 and the outer diameter of the first vertical pipe 61 are approximately the same. The upper end of the first vertical pipe 61 is disposed within the lower socket 160 via a third sealing member 161. Note that the drain trap 151 does not necessarily have to include the third sealing member 161. In this example, the area where the upper socket 156 of the drain trap 151 and the connecting pipe 146 overlap in the vertical direction Z is insulated by a foamed resin layer 156a of the upper socket 156. In the drain trap 151 configured in this manner, the trap unit 157 is detachable from the trap body 152.

[0059] The expansion joint 141 of this embodiment described above can also prevent condensation on the outer surface even if the second vertical pipe 66 and the connecting pipe 146 arranged inside it contract.

[0060] (Fifth embodiment) Next, a fifth embodiment of the present invention will be described with reference to FIGS. 8 and 9. 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. As shown in FIGS. 8 and 9, the expansion joint 171 of this embodiment includes a first pipe 27, a hollow portion 176, and a second cap 51. The hollow portion 176 is a cover that radially covers the outside of the first pipe material 27 and is formed in a cylindrical shape as a whole. The hollow portion 176 is composed of a pair of divided bodies 177 formed by dividing the hollow portion 176 into two at a plane including the central axis of the hollow portion 176. Each divided body 177 includes a tubular piece 178 , a first annular member piece 179 , and a second annular member piece 180 .

[0061] The tubular pieces 178 cover the first tubular material 27 from the outside in the radial direction. A second tubular material 178A is formed by a pair of tubular pieces 178. That is, the pair of tubular pieces 178 are formed by dividing the second tubular material 178A in the circumferential direction. The first annular member piece 179 is formed in a semicircular ring shape. The first annular member piece 179 extends radially inward from the upper end of the tubular piece 178. The pair of first annular member pieces 179 constitute a first annular member 179A. A flange 183 is formed on the radially inner end of the first annular member piece 179, protruding upward in the direction Z2. The second annular member pieces 180 are formed in a semicircular ring shape. The second annular member pieces 180 extend radially inward from the lower end of the tubular piece 178. A pair of second annular member pieces 180 constitute a second annular member 180A. The second annular member piece 180 has a flange 184 formed at its radially inner end portion, which projects downward Z1.

[0062] Each divided body 177 is integrally formed from resin etc. Each divided body 177 is fixed to the first pipe 27 by an adhesive (not shown) disposed between the outer circumferential surface of the first pipe 27 and the flanges 183, 184. Between the second pipe member 178A of the hollow portion 176 and the first pipe member 27, a hollow layer S9 is formed.

[0063] The expansion joint 171 of this embodiment described above can also prevent condensation on the outer surface even if the vertical pipe arranged inside contracts.

[0064] Although the first to fifth 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 to fifth embodiments, the first and second pipe materials may be integrally formed by a gas injection method to form an expansion joint having a hollow layer, with the portion of the expansion joint radially inward from the hollow layer being the first pipe material, and the portion of the expansion joint radially outward from the hollow layer being the second pipe material.

[0065] The expansion joint does not necessarily have to include the locking portion 30, the first sealing member 33, and the second cap 51. Although the piping connected by the expansion joint is a pair of vertical pipes, it may be a pair of horizontal pipes, for example. [Explanation of symbols]

[0066] 21, 21A, 21B, 91, 116, 141, 171 Expansion joints 27,122 1st pipe material 28, 98, 133, 179A First annular member 29,107,132,178A 2nd pipe material 42, 77, 108, 134, 180A Second annular member 45,81,88,111,131,176 Hollow part 86 Foam material (second annular member) S1,S2,S3,S5,S7,S9 Hollow layer

Claims

1. a first pipe member into which the end of the vertical pipe is disposed; a hollow portion in which a hollow layer is formed on the outer periphery of the first pipe material; a locking portion fixed to an inner peripheral surface of the first pipe; Equipped with The first pipe material is made of a resin that can be seen through, The hollow layer is positioned closer to the vertical pipe than the locking portion in the axial direction of the first pipe material, and extends toward the vertical pipe than the locking portion, so that a portion of the hollow layer overlaps with the vertical pipe.

2. a first pipe member into which the end of the vertical pipe is disposed; a hollow portion in which a hollow layer is formed on an inner periphery of the first pipe material; a locking portion fixed to an inner peripheral surface of the first pipe; Equipped with The first pipe material is made of a resin that can be seen through, The hollow layer is positioned closer to the vertical pipe than the locking portion in the axial direction of the first pipe material, and extends toward the vertical pipe than the locking portion, so that a portion of the hollow layer overlaps with the vertical pipe.

3. a first pipe member into which the end of the vertical pipe is disposed; a hollow portion in which a hollow layer is formed on an inner periphery of the first pipe material; a locking portion fixed to an inner peripheral surface of the first pipe; Equipped with The first pipe material is made of a resin that can be seen through, a sealing member is disposed below the locking portion; the hollow layer is disposed above the sealing member and closer to the vertical pipe than the engaging portion in the axial direction of the first pipe member, a lower end of the hollow layer is located closer to the vertical pipe than the engaging portion and lower than the lower end of the vertical pipe; an upper end of the hollow layer is located above a lower end of the vertical pipe; An expansion joint in which a portion of the hollow layer overlaps the vertical pipe.

4. The expansion joint according to claim 1 , wherein the hollow portion is made of a resin that is visible through the hollow portion.

5. The expansion joint according to claim 4 , wherein the resin of the first pipe material and the hollow portion is colorless and transparent or colored and transparent.

6. The hollow portion is a second pipe material that covers the first pipe material from the inside in the radial direction and has the hollow layer formed between the first pipe material and the second pipe material; a first annular member and a second annular member that are spaced apart from each other in the axial direction of the first pipe member and that close the hollow layer from both sides in the axial direction; 6. The expansion joint according to claim 2, wherein

7. 7. The expansion joint according to claim 6, wherein the first annular member and the second annular member are each connected to an outer circumferential surface of the second pipe and each contact the first pipe.

8. An expansion joint according to any one of claims 1 to 7; The vertical pipes include a first vertical pipe and a second vertical pipe, the first vertical pipe is connected to one end of the expansion joint; the second vertical pipe is connected to the other end of the expansion joint.

9. an air conditioning device connected upstream of the first vertical pipe; The piping system of claim 8.

10. Using the piping system according to claim 8 or 9, A building where water is drained to the outside from downstream of the second vertical pipe.

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