Piping construction

Abstract

To provide a piping structure that suppresses the flow of water through between a collective joint and both ends of an adhesive tape.SOLUTION: A piping structure 1 includes a collective joint 10 made of resin, a cover 25 that covers a part of the outer peripheral surface of the collective joint in the direction of an axis O of the collective joint, an adhesive tape 40 that adheres to the outer peripheral surface of the collective joint and the outer peripheral surface of the cover from the outside in the radial direction and connects the collective joint and the cover to each other over the entire circumferential direction, and a suppression part 45 that suppresses the flow of water through between the collective joint and the adhesive tape. A first end of the adhesive tape located on a first side in the circumferential direction is covered with a second end located on a second side of the adhesive tape in the circumferential direction from the outside in the radial direction. The suppression part suppresses the flow of water through between the collective joint and both ends of the adhesive tape.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a piping structure.

Background Art

[0002] Conventionally, a piping structure is known that includes a collective joint having a connection portion of a horizontal pipe extending substantially horizontally to a pipe having a vertical flow path (see, for example, Patent Document 1). A part of the piping structure is disposed within a through-hole of a floor slab. The through-hole is filled back with a filling material such as mortar.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, cast iron collective joints have been used. However, from the viewpoints of workability and durability, resin collective joints may be used. Since resin is lighter than cast iron, in resin collective joints, the sound when water such as drainage flows tends to be louder. In order to enhance the sound insulation property of the collective joint, the outer peripheral surface of the collective joint is covered with a cover. At this time, for example, the collective joint and the cover are connected to each other by an adhesive tape. The first end disposed at the first side in the circumferential direction of the adhesive tape is covered and connected from the radially outer side by the second end disposed at the second side in the circumferential direction of the adhesive tape. However, when constructing a piping structure in a multi-layer building, water such as rainwater may enter from the outside of the building into the building and accumulate on the floor slab. This water may flow between the collective joint and the adhesive tape and leak to the layer below the floor slab. In particular, this water easily flows between the collective joint and both ends of the adhesive tape.

[0005] This invention has been made in view of the above problems, and aims to provide a piping structure that suppresses the flow of water between the manifold joint and both ends of the adhesive tape. [Means for solving the problem]

[0006] To solve the aforementioned problems, this invention proposes the following means. The piping structure of the present invention comprises a resin manifold joint, a cover that covers a portion of the axial direction of the manifold joint on its outer circumferential surface, an adhesive tape bonded to the outer circumferential surface of the manifold joint and the outer circumferential surface of the cover from the radially outward direction, connecting the manifold joint and the cover to each other over their entire circumferential length, and a suppression portion that prevents water from flowing through the manifold joint and the adhesive tape, wherein a first end located at the first circumferential end of the adhesive tape is covered from the radially outward direction by a second end located at the second circumferential end of the adhesive tape, and the suppression portion prevents water from flowing through the manifold joint and both ends of the adhesive tape. In this invention, the adhesive tape is used with its first end covered radially outward by its second end. The cover enhances the sound insulation of the manifold joint. The piping structure is provided with a restraining portion for the adhesive tape connecting the manifold joint and the cover to each other. Therefore, it is possible to prevent water from flowing between the manifold joint and both ends of the adhesive tape.

[0007] Furthermore, in the piping structure, the restraining portion may be configured such that the axial length of the adhesive tape at the first end is shorter than the axial length of the adhesive tape at the second end, and a portion of the second end of the adhesive tape is bonded to the outer circumferential surface of the manifold joint from the radially outer side. In this invention, at the overlapping portion of the adhesive tape, not only is the first end of the adhesive tape adhered to the outer surface of the manifold joint, but a portion of the second end of the adhesive tape can also be adhered to the outer surface of the manifold joint. This ensures that both ends of the adhesive tape are securely adhered to the manifold joint.

[0008] Furthermore, in the piping structure, the restraining portion may be configured such that the first end of the joint in the axial direction at the first circumferential edge of the adhesive tape is inclined so that it gradually moves toward the second circumferential side as it moves from the second side toward the first side in the axial direction. In this invention, compared to the case where the end is aligned in the axial direction, the gap between the first and second ends of the adhesive tape, which serves as a water passage, becomes longer, making it possible to more reliably prevent water from flowing between the manifold and both ends of the adhesive tape.

[0009] Furthermore, in the piping structure, the restraining portion may be configured such that the end of the adhesive tape on the first side in the circumferential direction, on the second side in the axial direction of the manifold joint, is inclined to gradually move towards the second side in the circumferential direction as the manifold joint moves from the first side to the second side in the axial direction. In this invention, the gap between the first and second ends of the adhesive tape becomes longer, and this gap takes on a folded shape, making it difficult for water to flow through the inside of this gap. Therefore, it is possible to further prevent water from flowing through the joint and both ends of the adhesive tape.

[0010] Furthermore, in the piping structure, the restraining portion may be configured such that the first circumferential edge of the adhesive tape is formed in a stepped shape. In this invention, the gap between the first and second ends of the adhesive tape is folded in a stepped shape, making it difficult for water to flow through the gap between the first and second ends of the adhesive tape. Therefore, it is possible to more reliably prevent water from flowing between the manifold and both ends of the adhesive tape.

[0011] Also, in the piping structure, the restraining portion may cover the adhesive tape from the radially outer side so as to urge the adhesive tape toward the radially inner side. In this invention, due to the urging of the restraining portion, the adhesive tape is pressed against the outer peripheral surface of the collective joint. Therefore, the gap between the collective joint that serves as a water passage and the adhesive tape is narrowed, and it is possible to more reliably prevent water from flowing through between the collective joint and both end portions of the adhesive tape.

[0012] Also, in the piping structure, a part of the collective joint may be disposed in a through-hole of the floor slab, and a filler may be filled in the through-hole. In this invention, in a situation where the filler is filled in the through-hole and water tends to accumulate on the floor slab, it is possible to suppress water from flowing through between the collective joint and both end portions of the adhesive tape.

Advantages of the Invention

[0013] In the piping structure of the present invention, it is possible to suppress water from flowing through between the collective joint and both end portions of the adhesive tape.

Brief Description of the Drawings

[0014] [Figure 1] It is a front view showing a part of the piping structure according to the first embodiment of the present invention in a broken state. [Figure 2] It is a view seen in the A1 direction with a part of FIG. 1 being transparent. [Figure 3] It is a cross-sectional view taken along the cutting line A3 - A3 in FIG. 2. [Figure 4] It is a view for explaining a procedure of adhering an adhesive tape to a collective joint and a lower cover. [Figure 5] It is a view of a main part in the piping structure according to the first modification of the first embodiment of the present invention. [Figure 6] It is a view for explaining a procedure of adhering an adhesive tape to a collective joint and a lower cover. [Figure 7]It is a view of a main part in the pipe structure of the second modification of the first embodiment of the present invention. [Figure 8] It is a cross-sectional view of the cutting line A5 - A5 in FIG. 7. [Figure 9] It is a view for explaining the procedure of adhering an adhesive tape to the collective joint and the lower cover. [Figure 10] It is a view of a main part in the pipe structure of the third modification of the first embodiment of the present invention. [Figure 11] It is a front view of a part of the pipe structure of the second embodiment of the present invention with a break.

Mode for Carrying Out the Invention

[0015] (First Embodiment) Hereinafter, the first embodiment of the pipe structure according to the present invention will be described with reference to FIGS. 1 to 10. As shown in FIG. 1, the pipe structure 1 of the present embodiment is used in a multi - storey building (building) 101. In the multi - storey building 101, a plurality of floors 102 are stacked in the vertical direction. The floor slab 103 partitions between the plurality of floors 102 (that is, the upper floor and the lower floor). The floor slab 103 has a through - hole 103a penetrating in the vertical direction. The pipe structure 1 includes a collective joint 10, a cover 25, an adhesive tape 40, and a suppression part 45.

[0016] Here, the collective joint 10, the cover 25, and the adhesive tape 40 are each formed in a cylindrical shape. The central axes (axes) of the collective joint 10, the cover 25, and the adhesive tape 40 are arranged coaxially with a common axis. Hereinafter, the common axis is referred to as the axis O, and the direction along the axis O is referred to as the axis O direction. Among the axis O directions, the side of the lower connection pipe 12 with respect to the upper connection pipe 11 described later is referred to as the lower side (the first side in the axis O direction) Z1, and the side of the upper connection pipe 11 with respect to the lower connection pipe 12 is referred to as the upper side (the second side opposite to the first side in the axis O direction) Z2. When the pipe structure 1 is viewed from the vertical direction, the direction orthogonal to the axis O is referred to as the radial direction, and the direction of orbiting around the axis O is referred to as the circumferential direction. However, the downward Z1 and upward Z2 in the diagram are for illustrative purposes only and represent the orientation relative to the reference point. The same applies to the first side X1 and second side X2, which will be discussed later.

[0017] The shape of the manifold joint 10 is not particularly limited. For example, the manifold joint 10 has an upper connecting pipe 11 and a lower connecting pipe 12 connected to the upper connecting pipe 11. The upper connecting pipe 11 has a vertical pipe connecting portion 13 that can be connected to the first vertical pipe P1, and a horizontal pipe connecting portion 14 that protrudes from the side of the vertical pipe connecting portion 13 and can be connected to the horizontal pipe P3. The upper end of the vertical pipe connection section 13 has multiple ribs 13a that project radially outward. In the illustrated example, there are three sets of ribs 13a spaced apart in the axial direction O, and four sets of ribs 13a spaced apart in the circumferential direction. The four sets of ribs 13a are arranged at equal intervals in the circumferential direction. The radial size of the ribs 13a is not particularly limited. When the manifold joint 10 is installed in the multi-story building 101, the manifold joint 10 is held in place by a support fitting (not shown) that abuts against the rib 13a from the radially outer side.

[0018] The horizontal pipe connection portion 14 extends radially outward from the peripheral wall of the vertical pipe connection portion 13. In this embodiment, there are two horizontal pipe connection portions 14. The directions in which the two horizontal pipe connection portions 14 extend form a 90° angle in a plan view. The number of horizontal pipe connection sections 14 on the upper connecting pipe 11 may be one or three or more. A vertical rib 15 extending in the vertical direction is provided inside the vertical pipe connection section 13. The vertical rib 15 is positioned to avoid the base end opening of the horizontal pipe connection section 14. The upper connecting pipe 11 is a single molded piece. The upper end of the upper connecting pipe 11 is connected to the first vertical pipe P1.

[0019] The lower connecting pipe 12 is located below the upper connecting pipe 11. The lower connecting pipe 12 has an inclined pipe section 17 and a lower pipe section 18. The inclined pipe section 17 is located near the upper end of the lower connecting pipe 12 and gradually decreases in diameter as it extends downward. That is, the lower connecting pipe 12 gradually narrows downward from the upper connecting pipe 11. A flow straightening plate 19 extending in the vertical direction is provided inside the inclined pipe section 17. The lower pipe section 18 extends downward from the lower end of the inclined pipe section 17 and is connected to the second vertical pipe P2. The lower pipe section 18 is located below the inclined pipe section 17. In this embodiment, the piping structure 1 may or may not have vertical ribs 15 and flow straightening plates 19.

[0020] The manifold joint 10 is made of resin. More specifically, the upper connecting pipe 11 is a component integrally molded from a resin composition by injection molding or the like. Examples of resins constituting the resin composition include polyethylene resins, polyolefin resins such as polypropylene resins, ABS resins, and polyvinyl chloride resins, with polyvinyl chloride resins being preferred. "Polyolefin resin" means a resin consisting solely of polyolefin, or, in the case of a resin containing multiple types of resins, a resin in which the most abundant resin by mass is polyolefin. Similarly, "polyvinyl chloride resin" means a resin consisting solely of polyvinyl chloride, or, in the case of a resin containing multiple types of resins, a resin in which the most abundant resin by mass is polyvinyl chloride.

[0021] The inclined pipe section 17 and the lower pipe section 18 that constitute the lower connecting pipe 12 can be manufactured integrally, for example, by injection molding a resin composition. The resin composition that constitutes the lower connecting pipe 12 is the same as the resin composition that constitutes the upper connecting pipe 11. Alternatively, the inclined pipe section 17 and the lower pipe section 18 may be molded separately and then connected.

[0022] The upper connecting pipe 11 and lower connecting pipe 12 in the manifold joint 10 may be transparent or opaque. Making the upper connecting pipe 11 and lower connecting pipe 12 transparent allows the connection status of the upper connecting pipe 11 and lower connecting pipe 12 to be visually inspected. In addition, flame retardants such as non-thermal-expanding graphite or magnesium hydroxide may be incorporated into the manifold joint 10. The upper connecting pipe 11 and the lower connecting pipe 12 are connected to each other by adhesive or the like.

[0023] In this embodiment, the inclined pipe section 17 (part of the manifold joint 10) is located within the through-hole 103a of the floor slab 103. A filler material 104 such as mortar is filled between the opening periphery of the through-hole 103a in the floor slab 103 and the cover 25 (inside the through-hole 103a).

[0024] The inclined pipe section 17 may also be manufactured by extruding a resin composition containing resin and a thermal expansion material. Examples of resins that can make up the inclined pipe section 17 include polyolefin resins and polyvinyl chloride resins, with polyvinyl chloride resins being preferred. Polyvinyl chloride resins allow for more reliable sealing of the pipeline in the event of a fire. Any material that expands due to the heat generated during a fire can be used as a thermal expansion material; for example, thermally expandable graphite can be used.

[0025] The inclined pipe section 17 may be a single-layer structure consisting of a single resin composition, or it may be a multi-layer structure consisting of multiple layers. If the inclined pipe section 17 has a multi-layer structure, it is sufficient that any of the layers are formed from a resin composition containing a thermal expansion material. For example, if the inclined pipe section 17 has a three-layer structure consisting of a surface layer, an intermediate layer, and an inner layer, the intermediate layer may be formed from a resin composition containing a thermal expansion material.

[0026] The surface layer, intermediate layer, and inner layer may contain a heat-absorbing agent. Examples of heat-absorbing agents include inorganic hydroxides such as magnesium hydroxide, aluminum hydroxide, kaolin-based minerals (kaolinite, halloysite, dickite), and hydrotalsalsite, as well as water-absorbing inorganic compounds such as sepiolite, bentonite, montmorillonite, talc, mica, quartz, zeolite, wollastonite, and nepheline siyanite.

[0027] If the intermediate layer contains thermally expandable graphite, the intermediate layer will appear black. Therefore, it is preferable to include a coloring agent other than black in the surface layer and inner layer so that they can be distinguished from the intermediate layer. The thickness of the surface layer and the inner layer is preferably 0.3 mm to 3.0 mm, and more preferably 0.6 mm to 1.5 mm. If the thickness of the coating layers, which are the surface layer and the inner layer, is 0.3 mm or more, sufficient mechanical strength of the inclined pipe section 17 as a pipe can be ensured. If the thickness of the coating layer is 3.0 mm or less, a decrease in the fire resistance of the inclined pipe section 17 can be suppressed. Furthermore, the inclined pipe section 17 is preferably one that meets the performance requirements specified in JIS K6741, for rigid polyvinyl chloride pipes.

[0028] The cover 25 has a lower cover 26 and an upper cover 27. The lower cover 26 has a lower sound-absorbing cover 30 and a lower sound-insulating cover 31. The lower sound-absorbing cover 30 is formed in a sheet-like shape that becomes flat when unfolded. The lower sound-absorbing cover 30 covers the entire circumference of the outer surface of the lower connecting pipe 12 (a portion of the outer surface of the manifold joint 10 in the direction of axis O). The lower sound-absorbing cover 30 is in direct contact with the outer surface of the lower connecting pipe 12. The upper end of the lower sound-absorbing cover 30 is positioned below the horizontal pipe connection portion 14.

[0029] The lower sound-absorbing cover 30 is formed from, for example, needle felt. For example, needle felt contains 40% to 50% polyethylene terephthalate, 35% to 45% acrylic fibers, and 10% to 20% wool or rayon. In manufacturing needle felt, a needle with a barb is inserted into the felt, and the fibers are mechanically intertwined. The lower sound-absorbing cover 30 may be formed from thermal felt, PET felt, or other felt materials, or from an acrylic fiber mixture, glass wool, or polyurethane foam. The density of the lower sound-absorbing cover 30 is 80 kg / m³. 3 The above is preferable. The thickness of the lower sound-absorbing cover 30 is preferably about 10 mm.

[0030] The lower sound insulation cover 31 is formed in a sheet shape that becomes flat when unfolded. The lower sound insulation cover 31 is in direct contact with the outer surface of the lower sound absorption cover 30. The upper end of the lower sound insulation cover 31 is positioned below the upper end of the lower sound absorption cover 30. The thickness of the lower sound insulation cover 31 is preferably about 1 to 5 mm, and more preferably about 2 mm. The surface density of the lower sound insulation cover 31 is 1 to 8 kg / m². 2 Preferably, it is 3.4 kg / m 2 It is preferable to have a degree of saturation. The lower sound insulation cover 31 is formed of an elastic resin material, such as an olefin-based material (a resin composition containing 300 to 600 parts by weight of inorganic filler per 100 parts by weight of olefin-based resin).

[0031] The inorganic fillers mentioned above are not particularly limited, but examples include silica, diatomaceous earth, alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, ferrites, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, basic magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, barium carbonate, donnite, hydrotalcite, calcium sulfate, barium sulfate, gypsum fiber, calcium silicate, talc, clay, mica, montmorillonite, bentonite, activated clay, sepiolite, imogolite, sericite, glass fiber, glass beads, silica-based balloons, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balloons, charcoal powder, various metal powders, potassium titanate, magnesium sulfate, lead zirconate titanate, aluminum borate, molybdenum sulfide, silicon carbide, stainless steel fiber, zinc borate, various magnetic powders, slag fiber, fly ash, dewatered sludge, etc. Of these, calcium carbonate is preferred as the inorganic filler due to the balance between weight and cost. These may be used individually or in a mixture of two or more.

[0032] The olefin resin is not particularly limited, but examples include low-density polyethylene (PE), high-density polyethylene, linear low-density polyethylene, atactic polypropylene, isotactic polypropylene, syndiotactic polypropylene, and poly-αolefin. In particular, those with a density of 0.87 to 0.93 g / cm³ are available. 3 Polyethylene is preferred as the olefin resin. Its density is 0.87 g / cm³. 3 If it is less than 0.93 g / cm², the strength of the lower sound insulation cover 31 is insufficient. 3 If it exceeds this value, there is a risk that the lower sound insulation cover 31 will buckle when it is flattened. Also, if the flexural modulus of the olefin resin is 100 to 3000 kg / cm 2 Therefore, it is sufficient in terms of strength and processability. The lower sound insulation cover 31 may be made of a material other than the olefin-based material, for example, polyvinyl chloride resin, polystyrene resin, ABS resin, AS resin, thermoplastic elastomer (TPE) or other elastomer material may be used.

[0033] Now, let's explain adhesive tape 40. For example, butyl tape is used for the adhesive tape 40. The adhesive tape 40 is in the shape of a strip. The adhesive tape 40 is used by unwinding it from a roll material in which the adhesive tape 40 is wound in a roll shape. The adhesive tape 40 has an adhesive layer (adhesive layer) (not shown) and is bonded to the manifold 10, etc., with the adhesive layer facing radially inward. The adhesive tape 40 is adhered to the outer circumferential surface of the manifold joint 10 and the outer circumferential surface of the lower cover 26 from the radially outer side. More specifically, the adhesive tape 40 is adhered to the outer circumferential surface of the upper end of the lower sound insulation cover 31, the outer circumferential surface of the portion of the lower sound absorbing cover 30 that protrudes above the lower sound insulation cover 31, and the outer circumferential surface of the manifold joint 10. The adhesive tape 40 connects the manifold joint 10 and the lower cover 26 to each other over their entire circumference. Furthermore, waterproof tape made of aluminum or similar material may be used as the adhesive tape.

[0034] Figure 2 is a view of Figure 1 as seen through the upper cover 27 in the direction of A1. That is, Figure 2 is a view of the piping structure 1 from the radially outside. As shown in Figures 2 and 3, the end of the adhesive tape 40 on the first side X1 in the circumferential direction (hereinafter simply referred to as the first side X1) is called the first end 41. The end of the adhesive tape 40 on the second side opposite to the first side in the circumferential direction (hereinafter simply referred to as the second side X2) is called the second end 42. In the adhesive tape 40, the width (length in the direction of axis O) is the same except for the first end 41. In the adhesive tape 40, the first end portion 41 is covered by the second end portion 42 from the radially outer side (hereinafter referred to as the end overlap structure). The edge 41a of the first side X1 of the adhesive tape 40 is inclined so that it gradually slopes towards the second side X2 as it goes from top to bottom (hereinafter referred to as the first inclined structure). As shown in Figure 1, in this embodiment, the upper end of the adhesive tape 40 is positioned above the upper surface of the floor slab 103. The lower part of the adhesive tape 40 is positioned within the through-hole 103a of the floor slab 103. However, the orientation and position of the adhesive tape 40 are not limited to those described herein.

[0035] Here, the procedure for adhering the adhesive tape 40 to the manifold joint 10 and the lower cover 26 will be explained using Figure 4. For example, the adhesive tape 40 is manufactured by unwinding it from a roll and then appropriately cutting the first end 41 to form the edge 41a. The adhesive tape 40 is adhered to the outer surfaces of the lower sound insulation cover 31, the lower sound absorption cover 30, and the manifold joint 10, starting from the first end 41 of the adhesive tape 40, while pulling the adhesive tape 40 in the circumferential direction. Then, as shown in Figures 2 and 3, the second end 42 is placed over the radially outside of the first end 41 and adhered. As the adhesive tape 40 is applied while being stretched, a gap S1 is formed between the first end X1 of the first end 41 and the second end 42 of the adhesive tape 40, as shown in Figure 3.

[0036] The suppression portion 45 is configured to include the end overlapping structure and the first inclined structure. Because the piping structure 1 includes the first inclined structure, the gap S1 becomes longer compared to the case where the edge of the first side X1 of the adhesive tape 40 is aligned with the axis O direction, making it more difficult for water to flow inside the gap S1. In this way, the suppression part 45 suppresses the flow of water through the manifold joint 10 and both ends 41, 42 (first end 41 and second end 42) of the adhesive tape 40. Furthermore, the lower end Z1 of the first side X1 edge of the adhesive tape 40 may be inclined so as it moves from top to bottom, it gradually slopes toward the second side X2.

[0037] As shown in Figure 1, the upper cover 27 has an upper sound-absorbing cover 34 and an upper sound-insulating cover 35. The upper sound-absorbing cover 34 and the upper sound-insulating cover 35 are constructed in the same way as the lower sound-absorbing cover 30 and the lower sound-insulating cover 31. The upper sound-absorbing cover 34 and the upper sound-insulating cover 35 each have two through holes 34a and 35a. The upper sound-absorbing cover 34 covers the outer surface of the upper connecting pipe 11 and the outer surface of the adhesive tape 40 over their entire circumference. Two horizontal pipe connection parts 14 of the upper connecting pipe 11 are located within the two through holes 34a of the upper sound-absorbing cover 34. The upper sound insulation cover 35 covers the entire outer surface of the upper sound absorption cover 34 in the circumferential direction. Two horizontal pipe connection parts 14 of the upper connecting pipe 11 are located within the two through holes 35a of the upper sound insulation cover 35. The lower cover 26 and the upper cover 27 may be fixed to the manifold 10 with tape or the like (not shown).

[0038] Next, we will explain the operation of the piping structure 1 configured as described above. Within the multi-story building 101, the layer 102 on which the upper cover 27 of the manifold joint 10 is located, and the layer 102 above it Z2, are equipped with drainage facilities such as toilets (not shown). Drainage water flows from these drainage facilities into the manifold joint 10 through the first vertical pipe P1 and horizontal pipe P3. The wastewater flows downward towards Z1 within the manifold joint 10, hitting the longitudinal ribs 15 and the flow straightening plate 19. The wastewater flows from the manifold joint 10 into the second vertical pipe P2 and is drained as needed. The sound generated when wastewater flows through the manifold joint 10 is less likely to leak to the outside of the cover 25 due to the cover 25.

[0039] As described above, in the piping structure 1 of this embodiment, the adhesive tape 40 is used with its first end 41 covered radially from the outside by the second end 42. The cover 25 enhances the sound insulation of the manifold joint 10. The piping structure 1 is equipped with a restraining part 45 for the adhesive tape 40 that connects the manifold joint 10 and the cover 25 to each other. Therefore, when installing the piping structure 1 in a multi-story building 101, it is possible to prevent water from accumulating on the floor slab 103 and flowing through the manifold joint 10 and both ends 41 and 42 of the adhesive tape 40. The floor slab may be a so-called stepped slab, where the upper and lower slabs are stepped. In this case, water tends to accumulate more on the lower slab than on the upper slab. The effect of this embodiment becomes even more pronounced when through holes are formed in the lower slab.

[0040] The suppression section 45 is configured to include a first inclined structure. As a result, the gap S1 between the first end 41 and the second end 42 of the adhesive tape 40, which serves as a water passage, becomes longer compared to the case where the edge 41a is aligned in the direction of axis O. As a result, it is possible to more reliably prevent water from flowing through the manifold 10 and both ends 41 and 42 of the adhesive tape 40. In addition, the gap S1 between the first end 41 and the second end 42 of the adhesive tape 40 becomes less likely to form, and the gap S1 becomes smaller. This also makes it possible to more reliably prevent water from flowing through the manifold 10 and both ends 41 and 42 of the adhesive tape 40. A portion of the manifold joint 10 is positioned within the through-hole 103a of the floor slab 103, and the through-hole 103a is filled with a filler material 104. As a result, when the through-hole 103a is filled with the filler material 104 and water tends to accumulate on the floor slab 103, it is possible to suppress the flow of water between the manifold joint 10 and both ends 41 and 42 of the adhesive tape 40.

[0041] The piping structure 1 of this embodiment can be modified in various ways, as described below. As shown in Figure 5, the first modified piping structure 1A may be provided instead of the restraining portion 45 of this embodiment. The restraining portion 50 is configured such that the end edge 41b of the first side X1 of the adhesive tape 40A is formed in a stepped shape (hereinafter referred to as the stepped structure). The restraining portion 50 is configured to include the stepped structure and the end overlapping structure. In this modified example, a portion of the edge 41b extends in the circumferential direction, while another portion of the edge 41b extends in the direction of axis O.

[0042] Here, the procedure for adhering adhesive tape 40A to the manifold joint 10 and the lower cover 26 will be explained using Figure 6. For example, adhesive tape 40A is manufactured by unwinding it from a roll and then appropriately cutting the first end 41 to form the edge 41b. In the adhesive tape 40A constituting the piping structure 1A of the first modified example, the adhesive tape 40A is adhered to the outer surface of the lower sound insulation cover 31, the outer surface of the lower sound absorption cover 30, and the outer surface of the manifold joint 10, starting from the first end 41 of the adhesive tape 40A, while pulling it in the circumferential direction. Then, the adhesive tape 40A is adhered in the circumferential direction, and the second end 42 is placed over the radially outside of the first end 41 and adhered.

[0043] In the piping structure 1A of the first modified example configured as described above, the gap between the first end 41 and the second end 42 of the adhesive tape 40A is folded in a stepped shape, making it difficult for water to flow inside the gap between the first end 41 and the second end 42 of the adhesive tape 40A. Therefore, it is possible to more reliably prevent water from flowing through the manifold 10 and both ends 41 and 42 of the adhesive tape 40.

[0044] As shown in Figures 7 and 8, the piping structure 1B of the second modified example may be provided with a restraining portion 55 instead of the restraining portion 45 of this embodiment. The restraining portion 55 is configured such that the width at the first end 41 of the adhesive tape 40B is shorter than the width at the second end 42 of the adhesive tape 40 (hereinafter referred to as a width-changing structure). A portion of the second end 42 in the direction of axis O protrudes in the direction of axis O more than the first end 41. The restraining portion 55 is configured such that the lower end 41c of the first side X1 edge of the adhesive tape 40B is inclined toward the second side X2 as it moves from the upper side Z2 toward the lower side Z1 (hereinafter referred to as the first inclined structure). The restraining portion 55 is configured such that the upper end 41d of the first side X1 edge of the adhesive tape 40B is inclined toward the second side X2 as it moves from the lower side Z1 toward the upper side Z2 (hereinafter referred to as the second inclined structure).

[0045] Furthermore, the suppression portion 55 is configured such that a portion of the second end portion 42 of the adhesive tape 40B is directly bonded to the outer circumferential surface of the manifold joint 10 from the radially outer side (hereinafter referred to as the direct bonding structure). The suppression portion 55 is composed of the end overlapping structure, width change structure, first inclined structure, second inclined structure, and direct bonding structure.

[0046] Here, the procedure for adhering adhesive tape 40B to the manifold joint 10 and the lower cover 26 will be explained using Figure 9. For example, adhesive tape 40B is manufactured by unwinding it from a roll and then appropriately cutting the first end 41 to form ends 41c, 41d, etc. In the adhesive tape 40B that constitutes the piping structure 1B of the second modified example, the adhesive tape 40B is adhered to the outer surface of the lower sound insulation cover 31, the outer surface of the lower sound absorption cover 30, and the outer surface of the manifold joint 10, starting from the first end 41 of the adhesive tape 40B, while pulling the adhesive tape 40B in the circumferential direction. Then, the adhesive tape 40B is adhered in the circumferential direction, and the second end 42 is placed over the radially outside of the first end 41 and adhered.

[0047] In the second modified piping structure 1B configured as described above, the restraining portion 55 is configured to include a width-changing structure and a direct bonding structure. Therefore, in the portion where both ends 41 and 42 of the adhesive tape 40B overlap, not only is the first end 41 of the adhesive tape 40B bonded to the outer surface of the manifold joint 10, but a portion of the second end 42 of the adhesive tape 40B can also be bonded to the outer surface of the manifold joint 10. This ensures that both ends 41 and 42 of the adhesive tape 40B are securely bonded to the manifold joint 10. The suppression section 55 is configured to include a second inclined structure in addition to the first inclined structure. As a result, the gap between the first end 41 and the second end 42 of the adhesive tape 40B becomes longer, and this gap takes on a folded shape, making it difficult for water to flow through the inside of this gap. Therefore, it is possible to further prevent water from flowing through the manifold 10 and both ends 41 and 42 of the adhesive tape 40B.

[0048] In addition, in the second modified piping structure 1B, the restraining portion 55 does not need to include the first inclined structure and the second inclined structure. The restraining portion 55 does not need to include the width-changing structure and the direct bonding structure.

[0049] As shown in Figure 10, the third modified piping structure 1C may be provided with a restraining portion 65 instead of the restraining portion 45 of this embodiment. This restraining portion 65 includes an overlap of a predetermined length (hereinafter also referred to as the overlap length L) between the ends 41 and 42 of the adhesive tape 40D.

[0050] The overlap length L is the length of the adhesive tape 40D in the longitudinal direction (circumferential direction) of the overlap portion of the adhesive tape 40D. In this modified example, the overlap length L is 30 mm or more and 200 mm or less. In this modified piping structure 1C, the edge 41e of the first side X1 in the adhesive tape 40D extends parallel to the direction of axis O. The edge 42a of the second side X2 in the adhesive tape 40D extends parallel to the direction of axis O. As a result, the overlap length L is the same along the entire length in the direction of axis O.

[0051] By the way, when the end 41 of the first side X1 in the adhesive tape 40D is covered by the end 42 of the second side X2, a step (a step in the thickness direction of the adhesive tape 40D) is created radially inward from the end 42 of the second side X2, caused by the edge 41e of the first side X1. Normally, a certain amount of tension is required to attach the adhesive tape 40D, but if too much tension is applied to the adhesive tape 40D, the adhesive tape 40D will stretch significantly in the circumferential direction (the longitudinal direction of the adhesive tape 40D) and will not follow the step, resulting in a large gap S1 (see, for example, Figure 3).

[0052] For example, when applying adhesive tape 40D with a specified elongation (JIS Z 0237 (2009)) as described later, if the adhesive tape 40D is applied with tension such that the overlap length L exceeds 200 mm, there is a high possibility that the adhesive tape 40D (end 42 of the second side X2) will not follow the step, resulting in a gap S1. Furthermore, even with appropriate tension, an overlap length L exceeding 200 mm is unnecessary, and in this case, costs will increase and installation will become more difficult. In contrast, by setting the overlap length L to 200 mm or less, the adhesive tape 40D (end 42 of the second side X2) can follow the step and fill the gap S1, making it easier to wrap and install.

[0053] On the other hand, if the overlap length L is less than 30 mm, installation becomes difficult even if the tension is appropriate. Furthermore, in this case, even a slight misalignment of the overlap of the adhesive tape 40D can reduce the adhesive strength, and there is a risk that the ends 41 and 42 of the adhesive tape 40D will peel off from each other. By setting the overlap length L to 30 mm or more, the peeling of the ends 41 and 42 from each other can be prevented.

[0054] In this modified example, one preferred form of adhesive tape 40D is illustrated below. The width of the adhesive tape 40D is preferably 20 mm to 75 mm, and more preferably 30 mm to 50 mm. If the width of the adhesive tape 40D is 20 mm or more, it is possible to suppress changes in the tensile load of the adhesive tape 40D due to temperature changes during storage. On the other hand, if the width of the adhesive tape 40D is 75 mm or less, it is possible to prevent the tape from shifting due to the load applied to the cover 25 during installation.

[0055] The thickness of the adhesive tape 40D is preferably 0.15 mm to 3.0 mm, more preferably 0.5 mm to 2.5 mm, and most preferably 1.0 mm to 2.0 mm before wrapping. If the thickness of the adhesive tape 40D is 0.15 mm or more, it is thick enough to compress and deform the adhesive tape 40D to fill the gap S1. On the other hand, if the thickness of the adhesive tape 40D is 3.0 mm or less, the gap S1 created by the thickness of the adhesive tape 40D can be reduced, and less force is required when wrapping.

[0056] The longitudinal tensile strength of the adhesive tape 40D is preferably 1N / 25mm to 45N / 25mm, and more preferably 2N / 25mm to 40N / 25mm, in an atmosphere of 23°C. If the tensile load of the adhesive tape 40D is 1N / 25mm or more, wrinkles are less likely to occur and the tape is less likely to break when wrapped. On the other hand, if the tensile load of the adhesive tape 40D is 45N / 25mm or less, changes in the tensile load of the adhesive tape 40D due to temperature changes during storage can be suppressed.

[0057] The longitudinal elongation of the adhesive tape 40D is preferably 300% to 2000% in an atmosphere of 23°C. An elongation of 300% or more allows the adhesive tape 40D to easily conform to steps in the thickness direction. An elongation of 2000% or less prevents excessive tension from being applied during wrapping.

[0058] The tensile strength and elongation of adhesive tape 40D can be measured under conditions of 23°C using a method conforming to JIS Z 0237 (2009).

[0059] The absolute value of the difference in tensile load of the adhesive tape 40D during temperature changes, specifically the difference between the tensile load at 0°C and the tensile load at 45°C, is preferably 60N or less, and more preferably 40N or less. If the difference in tensile load of the adhesive tape 40D during temperature changes is 60N or less, it is possible to suppress changes in the tensile load of the adhesive tape 40D due to temperature changes during storage.

[0060] The adhesive strength of the adhesive tape 40D is preferably 10N or more, and more preferably 30N or more. If the adhesive strength of the adhesive tape 40D is 10N or more, it is possible to suppress changes in the tensile load of the adhesive tape 40D due to temperature changes during storage.

[0061] The adhesive strength of adhesive tape 40D can be measured under conditions of 23°C using a method conforming to JIS Z 0237 (2009).

[0062] The thickness of the base material (resin foam) is preferably 100 μm or more and 1500 μm or less, and more preferably 600 μm or more and 1000 μm or less. If the thickness of the base material (resin foam) is 100 μm or more, it is less likely to break when wrapped around the cover 25. On the other hand, if the thickness of the base material (resin foam) is 1300 μm or less, it is easier to follow the steps and less likely to wrinkle.

[0063] The thickness of the adhesive layer is preferably 50 μm to 200 μm, and more preferably 100 μm to 150 μm. If the thickness of the adhesive layer is 50 μm or more, it is possible to prevent the adhesive tape 40D from peeling off due to temperature changes during storage. On the other hand, if the thickness of the adhesive layer is 200 μm or less, it is possible to prevent cohesive failure of the adhesive layer.

[0064] The foaming ratio of the base material (resin foam) is preferably 2 to 10 times, and more preferably 4 to 9 times. If the foaming ratio of the base material (resin foam) is above the lower limit, it is possible to suppress changes in the tensile load of the adhesive tape 40D due to temperature changes during storage. On the other hand, if the foaming ratio of the base material (resin foam) is below the upper limit, it is less likely to break when wrapped around the cover 25.

[0065] The foaming ratio of the base material (resin foam) can be calculated, for example, by dividing the specific gravity of the resin constituting the foam in its foamed state by the specific gravity of the resin constituting the foam in its unfoamed state. The specific gravity can be calculated by cutting the base material (resin foam) to a certain size and dividing the volume (calculated by measuring the thickness, width, and length with calipers) by the mass (measured with an electronic balance, etc.).

[0066] Examples of foam materials include polyethylene, polypropylene, urethane, and rubber.

[0067] Examples of materials for the adhesive layer include acrylic adhesives and rubber adhesives.

[0068] (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to Figure 11. The same reference numerals are used for parts identical to those in the previous embodiment, and their descriptions will be omitted. Only the differences will be described. As shown in Figure 11, the piping structure 2 of this embodiment is equipped with a restraining portion 60 in place of the restraining portion 45 of the piping structure 1 of the first embodiment. In this embodiment, no edge 41a is formed on the adhesive tape 40C. In the adhesive tape 40C as well, the first end portion 41 is covered from the radially outer side by the second end portion 42. For example, the restraining portion 60 is a shrink film wrapped around the adhesive tape 40C. The restraining portion 60 covers the adhesive tape 40C from the radial outside so as to bias the adhesive tape 40C radially inward.

[0069] As described above, in the piping structure 2 of this embodiment, the adhesive tape 40C is pressed against the outer surface of the manifold joint 10 by the biasing force of the restraining part 60. Therefore, the gap between the manifold joint 10, which is the passage for water, and the adhesive tape 40C is narrowed, and it is possible to more reliably prevent water from flowing through the gap between the manifold joint 10 and both ends 41, 42 of the adhesive tape 40C.

[0070] Although the first and second embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications, combinations, deletions, etc., of the configuration are also included without departing from the spirit of the present invention. Furthermore, it goes without saying that each of the configurations shown in each embodiment can be used in appropriate combinations. For example, in the first and second embodiments, the configuration of the cover is not limited to that which improves the sound insulation of the manifold 10. For example, the cover 25 does not need to have an upper cover 27. [Explanation of symbols]

[0071] 1,1A,1B,1C,2 Piping structure 10 Manifold joint 25 Cover 40, 40A, 40B, 40C, 40D Adhesive Tape 41 First end 41a,41b edge 41c,41d End 42 Second end 45,50,55,60,65 Suppression part 103 Floor slab 103a Through hole 104 Filling material O axis X1,Z1 1st side X2,Z2 2nd side

Claims

1. A resin manifold joint, A lower cover covering the lower part of the axial direction of the manifold on the outer circumferential surface of the manifold, An upper cover covering the upper part of the manifold in the axial direction of the manifold and the upper end of the lower cover, Adhesive tape is bonded to the outer circumferential surface of the manifold joint and the outer circumferential surface of the lower cover from the radially outward direction, and connects the manifold joint and the lower cover to each other over their entire circumferential direction. The ends of the adhesive tape overlap in the circumferential direction, A suppression part that prevents water from flowing through the gap between the aforementioned joint and the overlapping structure of the adhesive tape, Equipped with, The first end of the adhesive tape, which is located at the first end in the circumferential direction, is covered from the radially outer side by the second end of the adhesive tape, which is located at the second end in the circumferential direction. The suppression portion is configured such that the axial length of the adhesive tape at the first end is shorter than the axial length of the adhesive tape at the second end, and a portion of the second end of the adhesive tape is bonded to the outer circumferential surface of the manifold from the radially outer side. The adhesive tape comprises a base material and an adhesive layer. The aforementioned base material is a resin foam, and the piping structure is as described above.

2. The width of the adhesive tape is 20 mm or more and 75 mm or less. The thickness of the adhesive tape is 0.15 mm or more and 3.0 mm or less. The piping structure according to claim 1, wherein the end overlap structure is 30 mm or more and 200 mm or less.

3. The aforementioned end overlapping structure is, The axial length of the first end of the adhesive tape is shorter than the axial length of the second end of the adhesive tape, and The piping structure according to claim 1 or 2, wherein a portion of the second end of the adhesive tape is bonded to the outer circumferential surface of the manifold joint from the radially outer side.

4. The piping structure according to any one of claims 1 to 3, wherein the end overlapping structure is configured such that the first end of the joint in the axial direction at the first end of the adhesive tape in the circumferential direction is inclined so as it moves from the second side in the axial direction toward the first side toward the second side in the circumferential direction.

5. The piping structure according to claim 4, wherein the end overlapping structure is configured such that the first circumferential edge of the adhesive tape is inclined to gradually move toward the second circumferential side as it moves from the first side toward the second side in the axial direction of the manifold joint.

6. The piping structure according to claim 1 or 2, wherein the end overlapping structure is configured such that the first circumferential edge of the adhesive tape is formed in a stepped shape.

7. The piping structure according to claim 1 or 2, wherein the end overlapping structure covers the adhesive tape from the radially outer side so as to bias the adhesive tape toward the radially inward side.

8. A portion of the aforementioned joint is placed within a through-hole in the floor slab. The piping structure according to any one of claims 1 to 7, wherein the through-hole is filled with a filler material.

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