Drainage system and building

Abstract

To provide an expansion joint that suppresses dew condensation on the outer surface and facilitates construction when connecting to piping.SOLUTION: An expansion joint 26 includes a joint main body 27, a pair of sockets 28 and 29 provided at both ends of the joint main body 27 and into which pipes 16 and 52 with insulating layers 18 and 52a respectively provided are inserted, and a heat insulating portion S1 which is formed in an annular shape and arranged coaxially with the joint main body 27.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a drainage system and a building.

Background Art

[0002] Conventionally, in a general expansion joint used in the drainage field, a socket is provided at the connection portion with the downstream piping structure (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the expansion joint of Patent Document 1, for example, in order to make the outer diameters of the pipes connected to the downstream side and the upstream side of the expansion joint the same, on the downstream side of the expansion joint, a second joint that is a joint different from the expansion joint and both ends of which are sockets (so-called sockets) needs to be arranged. In this case, the end of the upstream pipe is connected to the end of the expansion joint on the side opposite to the end where the socket is provided. The socket of the expansion joint is arranged in one socket of the second joint. The end of the downstream pipe is arranged in the other socket of the second joint.

[0005] However, when the expansion joint is used for draining the drain water (condensate) of air conditioning equipment, since the drain water is relatively cold, there is a risk of dew condensation on the outer surface of the expansion joint. For pipes, dew condensation can be suppressed by using pipes provided with a heat insulating layer.

[0006] The present invention has been made in view of such problems, and an object thereof is to provide an expansion joint that suppresses dew condensation on the outer surface and is easy to construct when connecting to a pipe, and a drainage system including this expansion joint.

Means for Solving the Problem

[0007] To solve the above problems, the present invention proposes the following means. The expansion and contraction joint of the present invention includes a joint body, a pair of receiving ports provided at both ends of the joint body and into which pipes provided with heat insulation layers are inserted, a heat insulation portion formed in a ring shape and coaxially arranged on the joint body, a holding portion formed in one of the receiving ports and having a sealing member disposed inside, and a locking portion provided on the inner surface of the joint body. The end of the heat insulation portion is disposed at a distance from the holding portion and is disposed between the holding portion and the end of the pipe inserted into the one receiving port. According to the present invention, by inserting a pipe into the receiving ports provided at both ends of the joint body, the pipe can be connected to the expansion and contraction joint, so that the construction for connecting the expansion and contraction joint and the pipe can be easily performed. Further, since the heat insulation portion is disposed on the joint body, condensation on the outer surface of the expansion and contraction joint can be suppressed. Further, in the above expansion and contraction joint, in the axial direction of the joint body, the outer surface of the joint body between the end of the heat insulation portion and the holding portion may not be covered by the heat insulation portion.

[0008] Further, in the above expansion and contraction joint, the locking portion and the inner diameter of the pipe may be of the same degree. Further, in the above expansion and contraction joint, in the axial direction of the joint body, the lower end of the heat insulation portion may be at the same position as the locking portion.

[0009] The drainage system of the present invention is a drainage system including the expansion and contraction joint according to any one of the above and the pipe, wherein the pipe connected to the other receiving port is shorter than the pipe connected to the one receiving port. Further, in the above drainage system, the pipe connected to the other receiving port penetrates the floor slab of the building in the vertical direction, and the lower end of the pipe connected to the other receiving port may be connected to a cheese connected to a horizontal pipe connected to an air conditioner.

[0010] In the above drainage system, the pipe connected to the other receiving port may penetrate the floor slab of the building in the vertical direction, and a thermally expandable refractory material may be disposed on the outer surface of the pipe disposed in the through hole of the floor slab. In the above drainage system, the lower end of the pipe connected to the other receiving port may be connected to a trap.

Advantages of the Invention

[0011] According to the expansion joint and the drainage system of the present invention, it is possible to suppress condensation on the outer surface and facilitate construction when connecting to a pipe.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0013] Hereinafter, a building in which an embodiment of the drainage system according to the present invention is used will be described with reference to FIGS. 1 to 7. As shown in FIG. 1, in a building 1 such as an apartment house or an office building, each floor is partitioned by a floor slab 6. A through hole 6a penetrating in the vertical direction Z is formed in the floor slab 6. The floor slabs 6 are connected to each other by a wall 5. An air conditioner 7 is installed below the floor slab 6. For example, the drainage system 11 of the present embodiment is used to drain the drain water generated by the air conditioner 7. The drainage system 11 includes a vertical pipe (pipe) 16, a horizontal pipe (pipe) 21, an expansion joint 26 of the present embodiment, and a drain trap 56.

[0014] As shown in FIG. 2, the vertical pipe 16 is a so-called heat-insulating pipe (drain pipe), and includes an inner layer pipe 17, a foamed resin layer (heat-insulating layer) 18, and a skin layer 19. The inner layer pipe 17 is formed of a hard vinyl chloride resin. The foamed resin layer 18 is provided in a cylindrical shape on the outer peripheral surface of the inner layer pipe 17. The skin layer 19 is provided on the outer peripheral surface of the foamed resin layer 18. That is, the vertical pipe 16 is provided with the foamed resin layer 18. The vertical pipe 16 has a lower thermal conductivity due to the gas in the foamed resin layer 18 than a normal drain pipe without the foamed resin layer 18. The vertical pipe 16 penetrates the floor slab 6 in the vertical direction Z (see FIG. 1). Note that the configuration of the vertical pipe 16 is not limited to this. For example, the vertical pipe may not include the skin layer 19.

[0015] The horizontal pipe 21 is configured in the same manner as the vertical pipe 16, for example. In this example, as shown in FIG. 1, the outer diameter of the horizontal pipe 21 is smaller than the outer diameter of the vertical pipe 16. The first end of the horizontal pipe 21 is connected to the air conditioner 7, and the second end of the horizontal pipe 21 is connected to the vertical pipe 16 via a cheese 8. The cheese 8 is disposed in the vicinity of the floor slab 6 located immediately above the cheese 8. The horizontal pipe 21 is inclined gradually downward from the first end toward the second end.

[0016] As shown in FIG. 2, the expansion joint 26 includes a joint body 27, a pair of sockets 28 and 29, a hollow portion 30, and a locking portion 31. The joint body 27 is formed in a circular tube shape. The joint body 27 is made of acrylonitrile-butadiene-styrene (ABS), polypropylene (PP), polyethylene (PE), vinyl chloride, or the like. The joint body 27 is arranged such that the axial direction of the joint body 27 is along the vertical direction Z. Note that the arrangement of the joint body 27 is not limited to this, and the joint body 27 may be arranged such that the axial direction of the joint body 27 intersects the vertical direction Z. The inner diameter of the joint body 27 is constant regardless of the position in the vertical direction Z. The inner diameter of the joint body 27 and the outer diameter of the vertical pipe 16 are approximately the same.

[0017] A plurality of protrusions 27a that protrude radially outward of the joint body 27 are formed on the outer peripheral surface of the joint body 27. The plurality of protrusions 27a are arranged at intervals in the vertical direction Z. The space between the plurality of protrusions 27a is an interval for gripping by a support tool (indicated by a two-dot chain line D in FIG. 2 and reference numeral 100 in FIG. 1) having a gripping portion for fixing the expansion joint 26 to the wall surface. The gripping portion of the support tool grips the outer surface of the joint body 27 between the protrusions 27a, and by a gripping portion (not shown) abutting against the side surface of the protrusion 27a, the expansion joint 26 is fixed so as not to follow the expansion and contraction of the vertical pipe 16. As shown in FIG. 1, the support tool 100 is fixed to the wall 5.

[0018] As shown in FIG. 2, the receiving port 28 is provided at the upper end portion of the joint body 27. In the receiving port 28, a holding portion 28a having a larger inner diameter and outer diameter than other portions in the receiving port 28 is formed. The holding portion 28a is formed in a cylindrical shape and is arranged coaxially with the joint body 27. Note that the coaxiality referred to in this specification means approximately coaxial. For example, it includes a state where one axis and the other axis are displaced by about several millimeters. On the outer peripheral surface of the holding portion 28a, a first locking portion 28b that protrudes radially outward is formed. The first locking portion 28b is preferably formed over the entire circumference of the holding portion 28a. Inside the radial direction of the holding part 28a, a first sealing member 34 is held. The first sealing member 34 is formed in an annular shape and is arranged coaxially with the holding part 28a. In the natural state where no external force acts on the first sealing member 34, the inner diameter of the first sealing member 34 is smaller than the inner diameter of the joint body 27. The first sealing member 34 is formed of, for example, a resin that is softer than the joint body 27.

[0019] In this example, a first cap 37 is detachably attached to the receiving port 28. The first cap 37 includes a first annular member 38 and a first peripheral wall portion 39. The first annular member 38 is formed in an annular shape and is arranged coaxially with the joint body 27. The inner diameter of the first annular member 38 and the outer diameter of the vertical pipe 16 are approximately the same. The first peripheral wall portion 39 is formed in a cylindrical shape and is arranged coaxially with the first annular member 38. The first peripheral wall portion 39 extends downward Z1 from the outer peripheral edge of the first annular member 38. The inner diameter of the first peripheral wall portion 39 is larger than the outer diameter of the holding part 28a. On the inner peripheral surface of the lower end portion of the first peripheral wall portion 39, a first engaged portion 39a that protrudes radially inward is formed. It is preferable that the first engaged portion 39a is formed over the entire circumference of the first peripheral wall portion 39. The inner diameter of the first engaged portion 39a and the outer diameter of the holding part 28a are approximately the same.

[0020] As shown in FIG. 7, a lubricant A1 may be applied in advance to the inner peripheral surface of the first sealing member 34 or the like. The lubricant A1 reduces the frictional force between the first sealing member 34 and the vertical pipe 16. The application of the lubricant A1 can be performed using a brush A2 or the like in a factory or the like. Applying the lubricant A1 in advance is preferable because it can prevent the omission of applying the lubricant A1 at the construction site of the drainage system 11 and prevent the use of an unexpected material as the lubricant A1. As the lubricant A1, castor oil, silicone, or the like is used, and it is particularly preferable to use silicone. When applying the lubricant A1 in advance, it is preferable to seal the opening of the first cap 37 (the opening of the first annular member 38) with a sealing member A3 such as a label so that dust does not adhere to the lubricant A1 or the like. In order to prevent dust from adhering to the lubricant A1 or the like, instead of the sealing member A3, the entire expansion joint 26 may be covered with a bag.

[0021] The first cap 37 configured as described above is integrally formed of a resin that does not include a foamed resin layer such as PP. Note that the first cap 37 may be formed of a resin such as PE, ABS, or vinyl chloride. As shown in FIG. 2, the first cap 37 is fitted into the receiving port 28 of the joint body 27. More specifically, the first annular member 38 of the first cap 37 contacts the upper surface of the holding portion 28a from above (one side in the axial direction) Z2 of this upper surface. The first peripheral wall portion 39 of the first cap 37 covers the holding portion 28a from the outside in the radial direction. The first engaged portion 39a of the first peripheral wall portion 39 is engaged with the first engaging portion 28b of the holding portion 28a from below Z1 of the first engaging portion 28b. In this way, the first cap 37 is fitted into the receiving port 28 of the joint body 27.

[0022] The vertical pipe 16 is disposed inside the receiving port 28 and the first annular member 38 of the first cap 37. Depending on the construction conditions, the lower end portion of the vertical pipe 16 is separated upward Z2 from the locking portion 31 described later.

[0023] The receiving port 29 is provided at the lower end portion of the joint body 27. A stepped portion (not shown) is formed on the outer peripheral surface of the receiving port 29.

[0024] The hollow portion 30 is formed in an annular shape and is coaxially disposed with the joint body 27. The hollow portion 30 includes a second annular member 42, a pipe member 43, and a second cap 44. The second annular member 42 is formed in an annular shape. The second annular member 42 is coaxially disposed with the joint body 27 at a portion between the stepped portion and the plurality of protrusions 27a on the outer peripheral surface of the joint body 27 in the vertical direction Z. The inner peripheral edge of the second annular member 42 is connected to the outer peripheral surface of the joint body 27. The pipe member 43 is formed in a circular tube shape. The pipe member 43 is arranged coaxially with the joint body 27 and covers the lower Z1 portion of the joint body 27 from the radially outer side. The pipe member 43 is spaced apart from the joint body 27 in the radially outer direction. The pipe member 43 extends downward Z1 from the radially outer end of the second annular member 42. On the outer peripheral surface of the lower end portion of the pipe member 43, a second locking portion 43a protruding outward in the radial direction is formed. It is preferable that the second locking portion 43a is formed over the entire circumference of the pipe member 43.

[0025] The joint body 27, the sockets 28, 29, the second annular member 42, and the pipe member 43 (hereinafter referred to as the main body portion 45) configured as described above are integrally formed without foaming a vinyl chloride-based resin or the like. In this case, the color of the main body portion 45 is colored gray, black, or the like.

[0026] The second cap 44 includes a third annular member 47 and a second peripheral wall portion 48. The third annular member 47 is formed in an annular shape and is arranged coaxially with the joint body 27. The third annular member 47 is spaced apart from the second annular member 42 in the downward Z1 direction. The inner diameter of the third annular member 47 and the outer diameter of the joint body 27 are approximately the same. The second peripheral wall portion 48 extends upward Z2 from the outer peripheral edge of the third annular member 47. The inner diameter of the second peripheral wall portion 48 is larger than the outer diameter of the pipe member 43. On the inner peripheral surface of the upper end portion of the second peripheral wall portion 48, a second engaged locking portion 48a protruding inward in the radial direction is formed. It is preferable that the second engaged locking portion 48a is formed over the entire circumference of the second peripheral wall portion 48. The inner diameter of the second engaged locking portion 48a and the outer diameter of the pipe member 43 are approximately the same. The second cap 44 is fitted onto the pipe member 43 in the same manner as the first cap 37 is fitted into the socket 28 of the joint body 27. The inner peripheral edge of the third annular member 47 of the second cap 44 is engaged with the stepped portion of the joint body 27.

[0027] The main body portion 45 and the second cap 44 form a heat insulation portion S1 that covers the joint main body 27 from the outside in the radial direction. For example, air is accommodated in the heat insulation portion S1, and the heat insulation portion S1 functions as an air layer. The heat insulation portion S1 is formed in an annular shape over the entire circumference of the joint main body 27 and is coaxially arranged with the joint main body 27. The heat insulation portion S1 covers the portion below Z1 of the joint main body 27. The thermal resistance value of the heat insulation portion S1 is larger than the thermal resistance value of the joint main body 27. The thermal resistance value of the heat insulation portion S1 is 0.075 m 2 ·K / W or more and 1.1 m 2 ·K / W or less, and 0.083 m 2 ·K / W or more and 0.70 m 2 ·K / W or less is preferable. By setting the thermal resistance value to be equal to or higher than the above lower limit value, it becomes difficult for condensation to occur on the outer surface of the pipe material 43, and by setting it to be equal to or lower than the above upper limit value, a joint with sufficient heat insulation performance can be obtained without using an expensive heat insulating material. The thickness of the heat insulation portion S1 (the value half of the difference between the outer diameter and the inner diameter of the heat insulation portion S1) L1 is 2 mm or more and 20 mm or less.

[0028] The locking portion 31 is formed in an annular shape. The inner diameter of the locking portion 31 and the inner diameter of the vertical pipe 16 are approximately the same. The locking portion 31 is arranged coaxially with the joint main body 27 inside the joint main body 27. The locking portion 31 is provided on the inner peripheral surface (inner surface) of the joint main body 27. That is, the outer peripheral edge of the locking portion 31 is fixed to the inner peripheral surface of the joint main body 27. The lower surface of the locking portion 31 is formed flat and is arranged along the horizontal plane. On the other hand, the upper surface of the locking portion 31 is inclined so as to gradually face downward Z1 as it approaches the axis of the joint main body 27. The locking portion 31 locks the vertical pipe 16 in the vertical direction Z. The aforementioned heat insulation portion S1 extends upward Z2 by a length L2 of 7.8 mm or more and 39 mm or less from the upper end of the locking portion 31. The heat insulation portion S1 extends to a position equivalent to the lower surface of the second sealing member 50 described later in the vertical direction Z or extends to below Z1 from the lower surface of the second sealing member 50. Note that the lower end of the heat insulation portion S1 may be flush with the upper surface of the locking portion 31 or may extend below Z1 from the upper surface of the locking portion 31.

[0029] Below Z1 from the locking portion 31 inside the joint body 27, an annular second sealing member 50 is disposed. The inner diameter and outer diameter of the second sealing member 50 are approximately the same as the inner diameter and outer diameter of the vertical pipe 16, respectively. The second sealing member 50 is formed of the same material as the first sealing member 34. The second sealing member 50 is in contact with the lower surface of the locking portion 31 from below Z1 of the locking portion 31.

[0030] At the receiving port 29 of the joint body 27, the upper end portion of the connecting pipe (pipe) 52 is disposed. The connecting pipe has the same cross-sectional shape and outer diameter as the vertical pipe 16. The connecting pipe 52 is provided with a foamed resin layer (heat insulating layer) 52a. The connecting pipe 52 is in contact with the lower surface of the second sealing member 50 from below Z1 of the second sealing member 50. In addition, when the foamed resin layer 52a of the connecting pipe 52 contains many closed cells as bubbles and there is no fear that drain water will penetrate into the foamed resin layer 52a from the end face, the second sealing member 50 may not be provided.

[0031] The configuration of the drain trap 56 is not particularly limited as long as it can prevent the backflow of drain water. For example, the drain trap 56 includes a trap body 57, a lid portion 58, a trap portion 59, a reduced diameter portion 60, and an upper receiving port 61. The lid portion 58, the trap portion 59, and a connecting member 64 described later constitute a trap unit 62. The upper receiving port 61, the reduced diameter portion 60, and the trap body 57 are arranged in the order of the upper receiving port 61, the reduced diameter portion 60, and the trap body 57 from above Z2 to below Z1.

[0032] The trap body 57 is formed in a cylindrical shape extending along the vertical direction Z. An opening 57a penetrating the trap body 57 in the radial direction is formed on the side surface of the trap body 57. The lid portion 58 is formed in a cylindrical shape with a bottom. The lid portion 58 is arranged such that the bottom wall portion faces the inner side in the radial direction and is fitted into the opening 57a of the trap body 57. The lid portion 58 is detachably attached to the opening 57a of the trap body 57 and seals the opening 57a of the trap body 57. The trap section 59 is disposed within the trap body 57 in a state of being spaced apart from the inner peripheral surface of the trap body 57. The trap section 59 is a funnel-shaped receiving container formed of a flexible material such as silicone rubber.

[0033] The trap section 59 is connected to the lid section 58 via a connecting member 64. The connecting member 64 can pass through the opening 57a of the trap body 57. The reduced-diameter section 60 is provided at the upper end portion of the trap body 57. For example, the reduced-diameter section 60 is formed in a cylindrical shape extending along the vertical direction Z. The outer diameter and the inner diameter of the reduced-diameter section 60 gradually increase respectively as going upward in the Z2 direction. The upper receiving port 61 is provided at the upper end portion of the reduced-diameter section 60. The upper receiving port 61 is formed in a cylindrical shape and extends upward in the Z2 direction from the outer edge portion of the reduced-diameter section 60. The inner diameter of the upper receiving port 61 and the outer diameter of the connecting pipe 52 are equal to each other. The lower end portion of the connecting pipe 52 is disposed within the upper receiving port 61.

[0034] A lower receiving port 65 is provided at the lower end portion of the trap body 57. The inner diameter of the lower receiving port 65 and the outer diameter of the vertical pipe 16 are approximately the same as each other. The upper end portion of another vertical pipe 16 is disposed within the lower receiving port 65 via a third sealing member 66. The drain trap 56 is configured without a foamed resin layer. In this example, in the vertical direction Z, the region where the upper receiving port 61 of the drain trap 56 and the connecting pipe 52 overlap is insulated by the foamed resin layer 52a of the connecting pipe 52. In the drain trap 56 configured as described above, the trap unit 62 is detachable with respect to the trap body 57. The drain trap 56 is connected to the expansion joint 26 via the connecting pipe 52.

[0035] The drainage system 11 configured as described above is installed in the building 1. In the drain trap 56 connected to the expansion joint 26 via the connecting pipe 52, as shown in FIG. 1, for example, a refractory sheet 101 formed of a known thermally expandable refractory material is wound around the outer peripheral surface of the connection portion between the drain trap 56 and the vertical pipe 16. At least a part of the refractory sheet 101 is disposed in the through hole 6a of the floor slab 6. Mortar 102 is filled between the opening peripheral edge of the through hole 6a of the floor slab 6 and the refractory sheet 101. The expansion joint 26 and the drain trap 56 are disposed in the vicinity of the floor slab 6 located immediately below Z1 the expansion joint 26 and the drain trap 56. On the other hand, in the expansion joint 26 not connected to the drain trap 56, for example, a refractory sheet 101 is wound around the outer peripheral surface of the connection portion between the expansion joint 26 and the vertical pipe 16. At least a part of the refractory sheet 101 is disposed in the through hole 6a of the floor slab 6. The expansion joint 26 is disposed in the vicinity of the floor slab 6 located immediately below Z1 the expansion joint 26. In addition, when a part of the drain trap 56 and the expansion joint 26 is not disposed in the through hole 6a of the floor slab 6, it is not necessary to wind the refractory sheet 101 around the outer peripheral surface.

[0036] Here, the linear expansion coefficient of the vertical pipe 16 is, for example, 6.5×10 -5 and the length of the vertical pipe 16 is, for example, 4 m or 10 m. When the length of the vertical pipe 16 is 4 m, it is assumed that the vertical pipe is expanded and contracted by an expansion joint for each floor in the building 1. By inserting the vertical pipe 16 and the connecting pipe 52 into the sockets 28 and 29 of the joint body 27, the vertical pipe 16 and the connecting pipe 52 can be connected to the expansion joint 26 without using other parts, so the construction of the drainage system 11 is easy.

[0037] Due to temperature differences and the like, the vertical pipe 16 and the like may expand and contract. When the vertical pipe 16 in the socket 28 of the expansion joint 26 is separated upward Z2 from the locking portion 31, the end of the vertical pipe 16 in the socket 28 moves in the vertical direction Z due to the expansion and contraction of the vertical pipe 16. Even in this case, since the expansion joint 26 is disposed in the vicinity of the floor slab 6 located immediately below Z1 of the expansion joint 26, the distances between the expansion joint 26 and the fireproof sheet 101 located immediately below Z1 of this expansion joint 26, and between the expansion joint 26 and the cheese 8 located immediately below Z1 of this expansion joint 26 can be kept short respectively. For this reason, it is difficult for the fireproof sheet 101 to move in the vertical direction Z from within the through hole 6a of the floor slab 6 and come out of the through hole 6a. Further, it is possible to suppress the cheese 8 from moving in the vertical direction Z and stress from acting on the horizontal pipe 21.

[0038] As the position of the expansion joint 26 in the drainage system 11, it is preferable that the cheese 8 disposed on a lower floor than this expansion joint 26 is closer to this expansion joint 26 than the cheese 8 disposed on the same floor as this expansion joint 26 on the upper surface of the floor slab 6, and it is more preferable that it is located 1.5 m or less from the upper surface of the floor slab 6. In other words, it is preferable that the vertical pipe 16 connected to the lower receiving port 29 of the expansion joint 26 is shorter than the vertical pipe 16 connected to the upper receiving port 28 of the expansion joint 26.

[0039] Here, the specific expansion and contraction length of the vertical pipe 16 is estimated. In winter and summer, for example, assume that the temperature difference is 30 °C. When the length of the vertical pipe 16 is 4 m, from Equation (1), the vertical pipe 16 expands and contracts by 7.8 mm. 6.5×10 -5 ×30×4 = 7.8 mm ··(1) If the aforementioned length L2 is 7.8 mm, the vertical pipe 16 with a length of 4 m is constructed so as to contact the upper surface of the locking portion 31 in summer. In this case, even if the vertical pipe 16 contracts by 7.8 mm in winter, the lower end of the vertical pipe 16 is disposed at the same position as the upper end of the heat insulating portion S1 in the vertical direction Z. For this reason, in the vertical direction Z, no region where neither the foamed resin layer 18 of the vertical pipe 16 nor the heat insulating portion S1 of the expansion joint 26 is disposed is generated, and condensation on the outer surface of the expansion joint 26 is suppressed.

[0040] On the one hand, the vertical pipe 16 with a length of 4m is constructed in winter such that the lower end of the vertical pipe 16 is separated upward by 7.8mm from the upper surface of the locking portion 31 in the Z2 direction. In this case, even if the vertical pipe 16 elongates by 7.8mm in summer, the lower end of the vertical pipe 16 is arranged at the same position as the upper surface of the locking portion 31 in the vertical direction Z. Therefore, the vertical pipe 16 strongly hits the locking portion 31, and damage to the vertical pipe 16 and the locking portion 31 can be suppressed. Considering both the case of constructing the 4m-long vertical pipe 16 in summer and it shrinking by 7.8mm in winter, and the case of constructing the 4m-long vertical pipe 16 in winter and it elongating by 7.8mm in summer, it is more preferable to set the aforementioned length L2 to 15.6mm, which is twice of 7.8mm.

[0041] When the length of the vertical pipe 16 is 10m, from equation (2), the vertical pipe 16 expands and contracts by 19.5mm. 6.5×10 -5 ×30×10 = 19.5mm ··(2) Considering the same as the case where the length of the vertical pipe 16 is 4m, if the aforementioned length L2 is set to 39mm, which is twice of 19.5, it can also cope with the case where the length of the vertical pipe 16 is 10m, so it is more preferable.

[0042] Also, assuming that the aforementioned length L2 is 26mm, the 10m-long vertical pipe 16 is constructed such that the lower end of the vertical pipe 16 is separated upward by 19.5mm from the upper surface of the locking portion 31 in the Z2 direction. Assuming that the construction period is winter, even if the temperature rises by 30°C in summer and the vertical pipe 16 elongates by 19.5mm, the vertical pipe 16 strongly hitting the locking portion 31 can be suppressed. Assuming that the construction period is summer, even if the temperature drops by 10°C in autumn, from equation (3), the vertical pipe 16 shrinks by 6.5mm. However, since the value of (26 - 19.5) is 6.5, condensation on the outer surface of the expansion joint 26 can be suppressed. 6.5×10 -5 ×10×10 = 6.5mm ··(3) After construction in summer, if the temperature drops below 10°C, assuming that the air conditioner 7 does not perform cooling operation or defrosting operation, the air conditioner 7 does not drain the drain water when the temperature drops in this way. Therefore, even if a region where neither the foamed resin layer 18 of the vertical pipe 16 nor the heat insulation part S1 of the expansion joint 26 is arranged in the vertical direction Z occurs during the period when the temperature drops below 10°C, the outer surface of the expansion joint 26 will not condense due to the drain water.

[0043] For example, when the thickness L1 of the heat insulation part S1 is 2 mm, by using the heat insulation part S1 as an air layer, the thermal resistance value is 0.083 m 2 ·K / W. Also, when the thickness L1 of the heat insulation part S1 is 20 mm, even when using the one with the highest thermal conductivity (0.05 W / m·K) as glass wool, it is 0.40 m 2 ·K / W.

[0044] As described above, according to the expansion joint 26 of the present embodiment, by inserting the vertical pipe 16 and the connecting pipe 52 into the sockets 28 and 29 provided at both ends of the joint body 27, the vertical pipe 16 and the connecting pipe 52 can be connected to the expansion joint 26, so that the construction when connecting the expansion joint 26 with the vertical pipe 16 and the connecting pipe 52 can be easily carried out. Also, since the heat insulation part S1 is arranged on the joint body 27, it is possible to suppress the outer surface of the expansion joint 26 from condensing.

[0045] The heat insulation part S1 extends upward Z2 by a length L2 of 7.8 mm or more and 39 mm or less from the upper end of the locking part 31. By configuring in this way, even if the vertical pipe 16 with a length of 4 m or 10 m expands and contracts due to temperature change, the vertical pipe 16 will not strongly hit the locking part 31, or due to the expansion and contraction of the locking part 31, a region where neither the foamed resin layer 18 of the vertical pipe 16 nor the heat insulation part S1 of the expansion joint 26 is arranged in the vertical direction Z will occur, and it is possible to more reliably suppress the outer surface of the expansion joint 26 from condensing. Also, by making the length L2 39 mm or less, it is possible to suppress the heat insulation part S1 from becoming too long in the vertical direction Z.

[0046] The thickness L1 of the heat insulation part S1 is 2 mm or more and 20 mm or less. Therefore, the inside and outside of the joint body 27 can be reliably insulated equally to a conventional expansion joint having an air layer. By making the thickness L1 20 mm or less, it is possible to suppress the outer diameter of the heat insulation part S1 from becoming too large. Further, according to the drainage system 11 of the present embodiment, it is possible to configure the drainage system using an expansion joint 26 that suppresses dew condensation on the outer surface and facilitates construction when connecting to the vertical pipe 16 and the connecting pipe 52.

[0047] The expansion joint and the drainage system of the present embodiment can be variously deformed in configuration as described below. As in the drainage system 11A shown in FIG. 3, instead of the second sealing member 50, the drain trap 56, and the connecting pipe 52 of the present embodiment, a drain trap 71 and a connecting pipe 72 may be provided. The drain trap 71 includes an upper receiving port 74 having a foamed resin layer 74a instead of the upper receiving port 61 of the drain trap 56. The inner diameters of the upper receiving port 74 and the upper receiving port 61 are approximately the same as each other. The connecting pipe 72 is a resin drain pipe without a foamed resin layer. In this example, in the vertical direction Z, the region where the upper receiving port 74 of the drain trap 71 and the connecting pipe 72 overlap is insulated by the foamed resin layer 74a of the upper receiving port 74. Also, the drainage system 11A configured in this way can achieve the same effects as the drainage system 11 of the present embodiment.

[0048] As in the expansion joint 81 shown in FIG. 4, a heat insulation part 82a that is a foamed resin layer may be formed in the joint body 82. In this modification, the heat insulation part 82a is disposed above Z2 than the locking part 31. As in the expansion joint 86 shown in FIG. 5, a heat insulating portion 88 may be provided on the outer side in the radial direction of the joint body 87. In this modification, the joint body 87 is configured by combining an upper body 87a and a lower body 87b. The heat insulating portion 88 is formed in a sheet shape, for example, of glass wool. After the joint body 87 is constructed, the heat insulating portion 88 is wound and fixed at a position above Z2 from the locking portion 31 on the outer peripheral surface of the joint body 87. As in the expansion joint 91 shown in FIG. 6, a heat insulating portion 92 may be provided inside the joint body 27 in the radial direction and at a position above Z2 from the locking portion 31. The heat insulating portion 92 is formed in an annular shape, for example, of a foamed material such as foamed polyethylene or foamed rubber.

[0049] As described above, although one embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and modifications, combinations, deletions, etc. of the configuration within the scope not departing from the gist of the present invention are also included. For example, in the above embodiment, the length L2 that the heat insulating portion S1 extends above Z2 from the locking portion 31 may be less than 7.8 mm or may exceed 39 mm. The thickness L1 of the heat insulating portion S1 may be less than 2 mm or may exceed 20 mm. The expansion joint may not include the locking portion 31. Although the heat insulating layers in the vertical pipe 16 and the connecting pipe 52 are assumed to be foamed resin layers, the heat insulating layers may be layers of only air or the like. Although the joint body is formed in a circular tubular shape, the shape of the joint body is not limited to this, and it may be formed in a square tubular shape or the like.

Explanation of reference numerals

[0050] 11, 11A Drainage system 16 Vertical pipe (pipe) 18, 52a Foamed resin layer (heat insulating layer) 26, 81, 86, 91 Expansion joint 27, 82, 87 Joint body 28, 29 Socket 31 Locking portion 52 Connecting pipe (pipe) 82a, 88, S1 Heat insulating portion L1 thickness Z vertical direction (axial direction) Z2 upward (one side in the axial direction)

Claims

1. A drainage system piped indoors in a building, a joint body, a pair of pipes each connected to both ends of the upstream side and the downstream side of the joint body and provided with a heat insulation layer, a heat insulation portion formed in a ring shape and disposed on the joint body, having, a drainage system in which the pipe connected to the end on the downstream side of the joint body is shorter than the pipe connected to the end on the upstream side of the joint body.

2. the drainage system penetrates the floor slab of the building in the vertical direction, the drainage system according to claim 1, wherein the joint body is installed above the floor slab.

3. the drainage system according to claim 1 or 2, wherein the lower end of the pipe connected to the end on the downstream side is connected to a tee connected to a horizontal pipe connected to an air conditioner.

4. the drainage system according to claim 2, wherein a thermally expandable refractory is disposed on the outer surface of the pipe disposed in the through hole of the floor slab.

5. the drainage system according to any one of claims 1 to 4, wherein the joint body is located 1.5 m or less from the upper surface of the floor slab of the building.

6. A building comprising the drainage system according to any one of claims 1 to 5.

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