Manifold joints and piping structures

Abstract

Furthermore, the present invention provides a manifold joint and piping structure with even higher sound insulation properties. [Solution] The manifold 10 comprises an upper connecting pipe 11 having a vertical pipe connection portion 13 located on the upper side and a horizontal pipe connection portion 14 provided on the vertical pipe connection portion 13, a tubular lower connecting pipe 12 connected to the upper connecting pipe 11 and decreasing in diameter from top to bottom, and a first sound insulation cover 20 that covers the upper connecting pipe 11 and the lower connecting pipe 12 from the outside, wherein the first sound insulation cover 20 has an upper cover 21 that covers the upper connecting pipe 11 from the outside and a lower cover 22 that covers the lower connecting pipe 12 from the outside, and the lower end of the lower cover 22 is located even lower than the lower end of the lower connecting pipe 12.

Description

Technical Field

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

Background Art

[0002] In order to prevent noise generated from the fluid flowing inside from leaking to the outside, a collective joint provided with a sound insulation cover is known (see, for example, Patent Document 1 below).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the sound insulation cover according to Patent Document 1 above only covers the collective joint from the outside. Therefore, a gap is formed between the sound insulation cover of the vertical pipe connected to the collective joint. As a result, there is a problem that sound still leaks from this gap.

[0005] The present invention has been made to solve the above problems, and an object thereof is to provide a collective joint and a piping structure having higher sound insulation performance.

Means for Solving the Problems

[0006] In order to solve the above problems, the present invention proposes the following means. A manifold joint according to one aspect of the present invention comprises an upper connecting pipe having a vertical pipe connection portion located on the upper side and a horizontal pipe connection portion provided on the vertical pipe connection portion; a tubular lower connecting pipe connected to the upper connecting pipe and decreasing in diameter from top to bottom; and a first sound-insulating cover covering the upper connecting pipe and the lower connecting pipe from the outside, wherein the first sound-insulating cover has an upper cover that covers the upper connecting pipe from the outside and a lower cover that covers the lower connecting pipe from the outside, and the lower end of the lower cover is located even lower than the lower end of the lower connecting pipe. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a manifold joint and a piping structure that have even higher sound insulation properties. [Brief explanation of the drawing]

[0008] [Figure 1] This is a front view showing the configuration of a manifold joint according to an embodiment of the present invention, and is a diagram showing the state before the first sound insulation cover is attached. [Figure 2] This is a front view showing the configuration of a manifold joint according to an embodiment of the present invention, with the first sound insulation cover attached. [Figure 3] This is an enlarged cross-sectional view of part III in Figure 2. [Figure 4] This is a front view showing the connection state of a manifold joint and a vertical pipe with a cover according to an embodiment of the present invention. [Figure 5] Figure 4 is an enlarged cross-sectional view of the main part. [Figure 6] This is an exploded view showing the configuration of a second sound-insulating cover according to an embodiment of the present invention. [Figure 7] This is a side view showing the configuration of a second sound-insulating cover according to an embodiment of the present invention. [Figure 8] This is a front view showing the configuration of a covered vertical pipe with a second sound-insulating cover attached, according to a modified embodiment of the present invention. [Figure 9] Figure 8 is a side view showing the configuration of the receiving opening cover according to a modified example. [Figure 10]It is a side view showing the configuration of a straight pipe cover according to a modified example shown in FIG. 8. [Figure 11] It is a side view showing a further modified example of a straight pipe cover according to a modified example shown in FIG. 8. [Figure 12] It is a figure showing a modified example of a collective joint according to an embodiment of the present invention and a connection state of a vertical pipe, and is a partial enlarged cross-sectional view corresponding to FIG. 5. [Figure 13] It is a front view showing a modified example of a vertical pipe with a cover according to an embodiment of the present invention. [Figure 14] It is a cross-sectional view taken along line XIV-XIV of FIG. 13. [Figure 15] It is a figure showing the state of a preparation step of a construction method according to an embodiment of the present invention. [Figure 16] It is a figure showing the states of the first to third steps of a construction method according to an embodiment of the present invention. [Figure 17] It is a figure showing the state of the fourth step of a construction method according to an embodiment of the present invention. [Figure 18] It is a figure showing the state of the fifth step of a construction method according to an embodiment of the present invention. [Figure 19] It is a flowchart showing each step of a construction method according to an embodiment of the present invention. [Figure 20] It is a front view showing a modified example of a collective joint according to an embodiment of the present invention. [Figure 21] It is an enlarged cross-sectional view of part XXI of FIG. 20. [Figure 22] It is a front view showing the connection state of a collective joint and a vertical pipe with a cover according to a modified example of an embodiment of the present invention.

Mode for Carrying Out the Invention

[0009] <First Embodiment> Hereinafter, a manifold joint 10, a piping structure 200, and a construction method according to the first embodiment of the present invention will be described with reference to Figures 1 to 19. The manifold joint 1 with a cover is used, for example, for building drainage and is placed in a slab penetration hole S1 formed in a floor slab S. A filler S2 is filled into the slab penetration hole S1, and the manifold joint 10 is fixed to the floor slab S via the filler S2. As shown in Figures 1 and 2, the manifold joint 1 with a cover according to this embodiment comprises a manifold joint 10 (manifold pipe joint) and a sound insulation cover 20 (first sound insulation cover) that covers the manifold joint 10.

[0010] The manifold joint 10 comprises 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 connection portion 13 that can be connected to a first vertical pipe P1, and a horizontal pipe connection portion 14 that protrudes from the side of the vertical pipe connection portion 13 and can be connected to a horizontal pipe P3. The first vertical pipe P1 is connected to the upper end of the upper connecting pipe 11.

[0011] In the following explanation, the direction along the central axis O of the vertical pipe connection 13 is referred to as the axial direction, the upper connecting pipe 11 side of the vertical pipe connection 13 along the axial direction is referred to as the upward direction, and the lower connecting pipe 12 side is referred to as the downward direction. Also, in a plan view from the axial direction, the direction perpendicular to the central axis O is referred to as the radial direction, and the direction that circles around the central axis O is referred to as the circumferential direction.

[0012] The horizontal pipe connection section 14 extends radially outward from the circumferential wall of the vertical pipe connection section 13. In the illustrated example, three horizontal pipe connection sections 14 are arranged. Two of the three horizontal pipe connection sections 14 are individually positioned on either side of the central axis O in the radial direction. The remaining horizontal pipe connection section 14 extends radially in a direction that forms a 90° angle with the direction in which each of the aforementioned two horizontal pipe connection sections 14 extends, when viewed from above. Note that the number and direction of extension of the horizontal pipe connection sections 14 are not limited to this configuration and can be changed as desired. As shown in Figure 1, connecting rings 15 to which horizontal pipes P3 are individually connected are attached to the radial outer ends of the horizontal pipe connection sections 14. The outer diameter of the connecting rings 15 is larger than the outer diameter of the horizontal pipe connection section 14.

[0013] The lower connecting pipe 12 is tubular in shape, with a smaller diameter at the bottom than at the top. The lower connecting pipe 12 includes a connecting pipe section 16 located at the upper end and connected below the upper connecting pipe 11, an inclined pipe section 17 connected below the connecting pipe section 16 and gradually decreasing in diameter as it extends downward, and a lower pipe section 18 connected to the lower end of the inclined pipe section 17 and to which the second vertical pipe P2 is connected. The connecting pipe section 16, the inclined pipe section 17, and the lower pipe section 18 are integrally formed, for example, by injection molding of a synthetic resin material.

[0014] The outer diameter of the connecting pipe section 16 is smaller than the outer diameter of the vertical pipe connecting section 13 in the upper connecting pipe 11. The peripheral wall of the connecting pipe section 16 is fitted inside the vertical pipe connecting section 13. However, the vertical pipe connecting section 13 may be fitted inside the connecting pipe section 16, and the connecting pipe section 16 and the vertical pipe connecting section 13 may be connected via an intermediate pipe (not shown). The outer diameter at the upper end of the inclined pipe section 17 is smaller than the outer diameter of the connecting pipe section 16. The outer diameter at the lower end of the inclined pipe section 17 is smaller than the outer diameter of the connecting pipe section 16. The axial size of the inclined pipe section 17 is larger than the axial size of the connecting pipe section 16.

[0015] The connecting pipe section 16 may contain a resin composition containing a polyvinyl chloride resin and thermally expandable graphite. The connecting pipe section 16 is manufactured by molding the resin composition. Typically, the connecting pipe section 16 is manufactured by extrusion molding of the resin composition. The connecting pipe section 16 may be a single-layer structure consisting entirely of the resin composition, or it may be a multi-layer structure consisting of multiple layers. In the case of a multi-layer structure, it is sufficient if any of the layers are formed from the resin composition. For example, if the connecting pipe section 16 has a three-layer structure consisting of a surface layer, an intermediate layer, and an inner layer, the intermediate layer may be formed from the resin composition, and the surface layer, intermediate layer, and inner layer may contain a heat absorbent.

[0016] The intermediate layer is black because it contains thermally expandable graphite. 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 inner layer is preferably 0.3 mm to 3.0 mm, and preferably 0.6 mm to 1.5 mm. If the thickness of the coating layer is 0.3 mm or more, sufficient mechanical strength as a pipe can be ensured, and if it is 3.0 mm or less, a decrease in fire resistance can be suppressed. Furthermore, it is preferable that the connecting pipe section 16 meets the performance requirements described in JIS K6741.

[0017] The outer diameter of the lower pipe section 18 is smaller than the outer diameter of the connecting pipe section 16, and larger than the outer diameter of the lower end of the inclined pipe section 17. The axial size of the lower pipe section 18 is smaller than the axial size of the connecting pipe section 16. In this embodiment, a spout pipe 90 is inserted through the inner circumference of the lower pipe section 18. The second vertical pipe P2 is fitted onto the outside of the spout pipe 90 from below, thereby connecting the second vertical pipe P2 to the lower connecting pipe 12.

[0018] The upper connecting pipe 11 and the lower connecting pipe 12 may be made transparent. This allows the connection status of the upper connecting pipe 11 and the 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 upper connecting pipe 11 and the lower connecting pipe 12.

[0019] As shown in Figure 2, the sound insulation cover 20 comprises a flexible upper sound insulation cover 21 (upper cover) that is wrapped around the upper connecting pipe 11 from the radial outside, and a tubular lower sound insulation cover 22 (lower cover) through which the lower connecting pipe 12 is inserted. The lower end of the upper connecting pipe 11 is positioned inside the upper end of the lower sound insulation cover 22. The lower end of the upper sound insulation cover 21 is wrapped around the upper end of the lower sound insulation cover 22 from the radial outside.

[0020] The upper sound insulation cover 21 is formed in sheet form from an elastic material such as modified asphalt, elastomer, rubber, polyolefin resin, or soft polyvinyl chloride resin. The upper sound insulation cover 21 may also contain inorganic materials such as calcium carbonate or barium sulfate, metal sheets such as iron or lead, or metal powder. The thickness of the upper sound insulation cover 21 is preferably 1.0 mm to 5.0 mm, and more preferably 1.5 mm to 4.0 mm. Furthermore, a surface material such as synthetic fiber nonwoven fabric or glass fiber nonwoven fabric may be laminated on one or both sides of the upper sound insulation cover 21.

[0021] As shown in Figure 2 or Figure 3, the lower sound insulation cover 22 comprises a tubular body 31 and a sheet body 32 attached to the inner circumferential surface of the tubular body 31 in a tubular shape. The axis of the tubular body 31 is located on the central axis O of the vertical pipe connection 13, and the axial direction of the tubular body 31 is parallel to the axial direction. The axial size of the tubular body 31 is, for example, about 283 mm. The wall thickness of the tubular body 31 is preferably, for example, about 1 to 5 mm. The surface density of the tubular body 31 is 1 to 8 kg / m³. 2 It is preferable that this be the case.

[0022] The tube body 31 comprises a first upper tube section 33, a first tapered section 34, and a first lower tube section 35. The first tapered section 34 is axially connected to the first upper tube section 33 and tapers as it moves away from the first upper tube section 33. Specifically, the first tapered section 34 is connected to the lower end of the first upper tube section 33 and decreases in diameter as it extends downward.

[0023] The first lower pipe section 35 extends downward from the lower end of the first tapered section 34. The first lower pipe section 35 is positioned on the opposite side of the first upper pipe section 33, straddling the first tapered section 34 in the axial direction, and is located below the first upper pipe section 33. The inner diameter of the first lower pipe section 35 is constant along its entire length in the axial direction. In the first lower pipe section 35, excluding the lower end, the outer diameter is constant along its entire length in the axial direction. The outer diameter of this portion (the maximum outer diameter of the first lower pipe section 35) is, for example, about 150 mm.

[0024] The outer circumferential surface of the lower end of the first lower pipe section 35 is chamfered. At the lower end of the first lower pipe section 35, the outer diameter decreases as it goes downwards, and the wall thickness also decreases as it goes downwards. In a longitudinal cross-sectional view along the axial direction, the outer circumferential surface of the lower end of the first lower pipe section 35 forms an inclined surface 35a that is inclined with respect to the central axis O (axial direction). Furthermore, the lower end of the first lower pipe section 35 is located further downward in the axial direction than the lower end of the lower pipe section 18. More specifically, the lower end of the first lower pipe section 35 is located lower than the lower end of the lower pipe section 18 in a range of 5 mm to 300 mm. Preferably, this range is 10 mm to 200 mm. More preferably, this numerical range is 10 mm to 100 mm. Most preferably, this numerical range is 10 mm to 50 mm. However, the lower end of the first lower pipe section 35 is located above the lower end of the ferrule pipe 90.

[0025] The first upper pipe section 33, the first tapered section 34, and the first lower pipe section 35 are arranged in this order from top to bottom (along the axial direction). As shown in Figure 2, the first upper pipe section 33 covers the connecting pipe section 16, the first tapered section 34 covers the inclined pipe section 17, and the first lower pipe section 35 covers the lower pipe section 18. The first upper pipe section 33 is smaller in the axial direction than the first tapered section 34 and larger in the axial direction than the first lower pipe section 35.

[0026] As shown in Figure 3, a locking portion 36 (positioning rib) is provided on the inner circumferential surface of the pipe body 31. The locking portion 36 protrudes from the inner circumferential surface of the pipe body 31. The locking portion 36 is formed in an annular shape that extends over the entire circumference in the circumferential direction. The locking portion 36 is provided on the first lower pipe section 35. The locking portion 36 is located below the axial center of the first lower pipe section 35. The locking portion 36 is located above the lower end (inclined surface 35a) of the first lower pipe section 35.

[0027] The locking portion 36 is preferably positioned, for example, about 5 to 20 mm away in the axial direction from the lower end edge of the first lower pipe portion 35. In the illustrated example, the protrusion amount (radial size) and wall thickness (axial size) of the locking portion 36 are equivalent to the wall thickness of the first lower pipe portion 35 excluding the lower end. The protrusion amount and wall thickness of the locking portion 36 are preferably both about 2 to 8 mm. However, from the viewpoint of molding and construction, it is preferable that the protrusion amount and wall thickness of the locking portion 36 are both about 3 mm.

[0028] The tube 31 is formed of a sound-insulating material. The sound insulation of the tube 31 is higher than that of the sound-absorbing material described later. The tube 31 is integrally molded by, for example, injection molding, pressure molding, blow molding, vacuum molding, etc. The tube 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).

[0029] 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.

[0030] The olefin resin is not particularly limited, but examples include low-density polyethylene, 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 / cm³, the strength of the tube 31 is insufficient. 3 If it exceeds this value, there is a risk of buckling when the pipe body 31 is flattened (when an axial force is applied to the pipe body 31). Also, the flexural modulus of the olefin resin is 100 to 3000 kg / cm 2 In that case, the strength and processability are sufficient. The tube body 31 may be made of a material other than the olefin-based material, for example, polyvinyl chloride resin, polystyrene resin, ABS resin, AS resin, elastomer material, etc. may be used.

[0031] The sheet body 32 is, for example, deformed into a tubular shape inside the tube 31, and can be unfolded into a flat shape when removed from the tube 31. The sheet body 32 has enough flexibility to be deformed from a flat shape to a tubular shape. However, the sheet body 32 does not necessarily have to be able to be unfolded into a flat shape.

[0032] The sheet body 32 is formed of a sound-absorbing material. The sound absorption properties of the sound-absorbing material are higher than those of the sound-insulating material. The sheet body 32 is formed of a porous material, such as glass wool, rock wool, felt, foamed urethane, foamed polyethylene, foamed polypropylene, etc. Of these, glass wool is preferred as the sheet body 32 in terms of fire resistance, sound insulation, vibration damping, and cost. In the lower sound-insulating cover 22 described above, the locking portion 36 locks onto the sheet body 32 and restricts the movement of the sheet body 32 relative to the pipe body 31. The locking portion 36 supports the sheet body 32 from below and restricts the sheet body 32 from moving downward relative to the pipe body 31.

[0033] Furthermore, the manifold joint 10 is further equipped with a cushioning material 61. The cushioning material 61 is fixed (attached) to the outer surface of the manifold joint 10. The cushioning material 61 is positioned between the outer surface of the manifold joint 10 and the inner surface of the pipe 31. The cushioning material 61 separates the outer surface of the manifold joint 10 and the inner surface of the pipe 31, thereby separating the manifold joint from the pipe 31. The cushioning material 61 supports the locking portion 36 from below. The cushioning material 61 restricts the detachment of the lower sound insulation cover 22 from the manifold joint 10.

[0034] The cushioning material 61 is formed from foamed tape (e.g., foamed polyethylene, foamed polyurethane, foamed polystyrene, etc.). The cushioning material 61 is formed by wrapping the foamed tape around the joint. The surface density (density) of the cushioning material 61 is lower than the surface density (density) of the pipe body 31. The surface density of the cushioning material 61 is 0.5 to 1.0 kg / m 2 The degree is suitable. The cushioning material 61 is not limited to the above material, and may be rubber material, for example.

[0035] As shown in Figures 4 and 5, a vertical pipe P2 is connected to the manifold joint 10 configured as described above, thereby forming a piping structure 200. In the piping structure 200, a second sound insulation cover 100 is attached to the vertical pipe P2 from the outer circumference. The vertical pipe P2 and the second sound insulation cover 100 function as a covered vertical pipe 300. The vertical pipe P2 has a receiving portion 110 and a straight pipe portion 111.

[0036] The socket portion 110 is provided at the upper end of the vertical pipe P2 and is connected to the ferrule pipe 90 provided at the lower end of the manifold joint 10. The socket portion 110 has a larger diameter than the straight pipe portion 111. The lower end of the socket portion 110 (the part that connects to the straight pipe portion 111) is funnel-shaped, gradually widening in diameter from bottom to top. The ferrule pipe 90 is fitted into the socket portion 110. An annular rubber ring 140 is provided inside the socket portion 110. The rubber ring 140 is interposed between the ferrule pipe 90 and the vertical pipe P2. This rubber ring 140 is provided to ensure watertightness and airtightness between the second sound insulation cover 100 and the vertical pipe P2. The straight pipe section 111 extends downward from the lower end of the socket section 110. The inner and outer diameters of the straight pipe section 111 are constant throughout its entire length.

[0037] The second sound insulation cover 100 includes a receiving opening cover 101 that covers the receiving opening 110 and a straight pipe cover 102 that covers the straight pipe section 111. Both the receiving opening cover 101 and the straight pipe cover 102 are made by laminating sound-absorbing material 120 and sound insulation material 122. The sound-absorbing material 120 is positioned radially inward relative to the sound insulation material 122. For example, the sound-absorbing material 120 can be made of the same material as the sheet body 32 (sound-absorbing material) described above. For example, the sound insulation material 122 can be made of the same material as the pipe body 31 (sound insulation material) described above.

[0038] The receiving opening cover 101 is, for example, a cylindrical body. The receiving opening cover 101 has an upper part 103 provided above the receiving opening 110 and a lower part 104 provided at the lower end of the receiving opening 110 and the upper end of the straight pipe section 111.

[0039] Here, the receiving cover 101 is fixed to the receiving portion 110 from the outer circumference by a fixing member 130 so as not to fall off. Shrink film or rubber membrane are preferably used as the fixing member 130. The fixing member 130 is provided over the entire area of ​​the receiving cover 101. The fixing member 130 is provided on both sides of the upper portion 103 and the lower portion 104. As a modified example, as shown in Figure 12, rubber rings can be provided as fixing members 130 on the upper portion 103 and the lower portion 104 of the receiving cover 101, respectively.

[0040] As shown in Figures 6 and 7, the straight pipe cover 102 can be unfolded into a planar shape, for example, and the straight pipe cover 102 becomes tubular when the planar straight pipe cover 102 is wrapped around the straight pipe section 111. In addition to the sound insulation material 122 and sound absorbing material 120 described above, the straight pipe cover 102 further includes hook-and-loop fasteners 121. The sound insulation material 122 can be unfolded into a rectangular planar shape. The hook-and-loop fasteners 121 are provided to fix the straight pipe cover 102 in the state where it is wrapped around the straight pipe section 111. The sound absorbing material 120 is laminated on the inside (inner surface) of the sound insulation material 122.

[0041] The receiving cover 101 and the straight pipe cover 102 may be fixed together. For example, in the modified configuration shown in Figures 8 to 10, a first hook-and-loop fastener 105 extending in the width direction (circumferential direction) is provided at the lower end of the lower part 104. A second hook-and-loop fastener 106 extending in the width direction is provided at the upper end of the straight pipe cover 102. The second hook-and-loop fastener 106 is bonded to the first hook-and-loop fastener 105 to securely fix the straight pipe cover 102 to the receiving cover 101 so that it cannot fall off. In this embodiment, the straight pipe cover 102 is attached from the outer circumference side of the receiving cover 101. Incidentally, as shown in Figure 11, it is also possible to form a slit 107 extending downward from the upper end of the straight pipe cover 102. For example, by tightly wrapping the straight pipe cover 102 around the slit 107 in a way that expands and contracts it, gaps between the receiving cover 101 and the straight pipe cover 102, and between the straight pipe cover 102 and the straight pipe section 111 can be prevented.

[0042] As shown in Figure 5, the vertical pipe P2 is inserted so as to cover the ferrule pipe 90 of the manifold joint 10 from the outer circumference. At this time, the upper end of the second sound insulation cover 100 is radially overlapping with the lower end of the sound insulation cover 20 (first sound insulation cover) of the manifold joint 10. For example, the lower end of the sound insulation cover 20 may be in contact with the upper end of the second sound insulation cover 100 from the outer circumference.

[0043] Furthermore, in this embodiment, the straight pipe cover 102 is attached to the outer circumference of the receiving cover 101. However, it is also possible to adopt a configuration in which the straight pipe cover 102 is attached to the inner circumference of the receiving cover 101, as in the modified vertical pipe 300 with cover shown in Figure 13. This configuration is suitable when the straight pipe cover 102 is a hard coating, for example, as shown in Figure 14. In this configuration, the straight pipe cover 102 has a tubular cover body 102a and ribs 102b. The ribs 102b protrude radially inward from the cover body 102a and are fixed to the outer circumference of the vertical pipe P2. Examples of this type of straight pipe cover 102 include VPS and fire-resistant double-layer pipes. Note that the ribs 102b may be omitted.

[0044] Next, the construction method according to this embodiment will be described with reference to Figures 15 to 19. In this construction method, first, as shown in Figure 15, the manifold joint 10 is installed on the floor slab S of the lower floor. Then, as shown in Figures 16 and 17, the vertical pipe P2 (vertical pipe with cover 300) is assembled to the installed manifold joint 10 from the upper floor side. After that, as shown in Figure 18, the manifold joint 10 of the upper floor is fixed to the floor slab S of the upper floor while being assembled to the vertical pipe P2 (vertical pipe with cover 300). At this time, the lower end of the lower sound insulation cover 22 of the manifold joint 10 of the upper floor covers the upper end of the receiving cover 101 radially. In this state, the lower sound insulation cover 22 and the receiving cover 101 may be fixed together, for example, with tape 150.

[0045] During the above construction process, when assembling the vertical pipe P2 to the manifold joint 10, as shown in Figure 16, the lower end of the straight pipe section 111 is inserted into the upper end (receiving port) of the manifold joint 10, so the lower end of the vertical pipe P2 needs to be exposed from the straight pipe cover 102. To expose the lower end of the vertical pipe P2 in this way, for example, the construction method shown in Figure 19 can be implemented.

[0046] As shown in Figure 19, this construction method includes a first step S1 of moving the straight pipe cover 102 downward relative to the straight pipe, a second step S2 of cutting the straight pipe cover 102 and the straight pipe section 111 by a predetermined distance from the lower end, a third step S3 of moving the straight pipe cover 102 upward relative to the straight pipe section 111, and a fourth step S4 of fixing the straight pipe cover 102 to the straight pipe section 111. This construction method assumes that the straight pipe cover 102 is movable relative to the receiving cover 101.

[0047] Specifically, in the first step S1, for example, the straight pipe cover 102 is shifted downward relative to the receiving cover 101 by the length to which the lower end of the straight pipe section 111 is to be exposed. By shifting it in this way, after cutting in the second step S2, when the straight pipe cover 102 is raised again in the third step S3, the lower end of the straight pipe section 111 will be exposed by the amount that the straight pipe cover 102 was initially shifted, that is, by the length to which the lower end of the straight pipe section 111 was to be exposed. In this way, by going through the first step S1 to the third step S3, the lower end of the straight pipe section 111 is exposed below the straight pipe cover 102 (Figure 16). In this state, the lower end of the straight pipe section 111 can be inserted into the upper end (receptacle) of the manifold joint 10 (Figure 17).

[0048] (Effects and Benefits) According to the above configuration, the lower end of the lower sound insulation cover 22 is located even lower than the lower end of the lower connecting pipe 12. As a result, when another pipe (vertical pipe P2) is connected to the lower connecting pipe 12, the lower end of the lower sound insulation cover 22 covers the connection point. Therefore, since there are no gaps in the cover that would hinder sound insulation, it is possible to further improve sound insulation.

[0049] According to the above configuration, the lower sound insulation cover 22 extends below the lower end of the lower connecting pipe 12 by a range of 10 mm to 15 mm. This allows for more reliable coverage of the gaps between pipes. Therefore, it is possible to further improve sound insulation. In addition, even if there are some construction errors when connecting the pipes, the possibility of gaps forming in the cover can be reduced. Therefore, it is possible to achieve both ease of construction and sound insulation.

[0050] According to the above configuration, the lower end of the lower sound insulation cover 22 is positioned above the lower end of the connection pipe 90. This minimizes the possibility of interference between the lower sound insulation cover 22 and other piping when connecting other piping to the connection pipe 90. As a result, it is possible to achieve both sound insulation and ease of installation.

[0051] According to the above configuration, the lower end of the first sound insulation cover (sound insulation cover 20) and the second sound insulation cover 100 overlap radially. This makes it less likely for gaps to form between the first sound insulation cover and the second sound insulation cover 100, thus further improving sound insulation performance.

[0052] With the above configuration, the lower end of the receiving cover 101 and the upper end of the straight pipe cover 102 overlap radially. As a result, no gap is created between these covers, further reducing the possibility of flow noise and friction noise generated from the fluid flowing inside the vertical pipe P2 leaking to the outside.

[0053] With the above configuration, the presence of the fixing member 130 minimizes the possibility of the receiving cover 101 falling off the vertical pipe P2.

[0054] With the above configuration, the formation of the slit 107 allows the straight pipe cover 102 to wrap more securely around the receiving cover 101 when covering it from the outer circumference. This reduces the possibility of the straight pipe cover 102 falling off. As a result, the possibility of sound insulation being compromised can be kept to a minimum.

[0055] According to the above method, since the straight pipe cover 102 is fixed so as to be movable relative to the receiving cover 101, it is possible to adjust the length by cutting the straight pipe section 111 and the lower end of the straight pipe cover 102 at once, and then move only the straight pipe cover 102 upward. This makes it possible to minimize the possibility of a gap forming between the upper side of the straight pipe cover 102 and the receiving cover 101. As a result, it is possible to avoid a decrease in sound insulation due to the formation of a gap.

[0056] According to the above method, since the straight pipe cover 102 is fixed to the receiving cover 101, it is possible to reduce the possibility of the straight pipe cover 102 falling off the receiving cover 101 even after prolonged use.

[0057] Embodiments of the present disclosure have been described above. Various changes and modifications can be made to the above configuration without departing from the spirit of the present invention.

[0058] For example, as shown in Figures 20 to 22, the manifold joint 10 can be configured without the aforementioned socket pipe 90. In this case, the vertical pipe P2 is a straight pipe section 111 along its entire length, and a receiving section 110 is not required. The upper end of such a vertical pipe P2 is exposed from the second sound insulation cover 100 (straight pipe cover 102) and is directly inserted into and fitted to the inner circumference of the lower pipe section 18. Even with this configuration, the lower end of the first sound insulation cover (sound insulation cover 20) and the second sound insulation cover 100 overlap radially, and the same sound insulation effects described above can be obtained.

[0059] The lower end of the lower sound insulation cover 22 may be located above the lower end of the lower connecting pipe 12. The second soundproofing cover 100 is not required for the vertical pipe P2.

[0060] <Note> The manifold joints and piping structures described in each embodiment can be understood, for example, as follows.

[0061] (1) A manifold joint according to the first embodiment comprises an upper connecting pipe having a vertical pipe connection portion located on the upper side and a horizontal pipe connection portion provided on the vertical pipe connection portion, a tubular lower connecting pipe connected to the upper connecting pipe and decreasing in diameter from top to bottom, and a first sound insulation cover covering the upper connecting pipe and the lower connecting pipe from the outside, wherein the first sound insulation cover has an upper cover that covers the upper connecting pipe from the outside and a lower cover that covers the lower connecting pipe from the outside, and the lower end of the lower cover is located even lower than the lower end of the lower connecting pipe.

[0062] According to the above configuration, the lower end of the lower cover is located even lower than the lower end of the lower connecting pipe. As a result, when other piping (vertical pipes) is connected to the lower connecting pipe, the lower end of the lower cover covers the connection point. Therefore, since there are no gaps in the cover that would hinder sound insulation, it is possible to further improve sound insulation.

[0063] (2) The manifold according to the second embodiment is the manifold according to (1), wherein the lower end of the lower cover is located below the lower end of the lower connecting pipe by a range of 10 mm to 15 mm.

[0064] According to the above configuration, the lower cover extends below the lower end of the lower connecting pipe by a range of 10 mm to 15 mm. This allows for more reliable sealing of the gaps between pipes. Therefore, it is possible to further improve sound insulation. In addition, even if there are some construction errors when connecting the pipes, the possibility of gaps forming in the cover can be reduced. Therefore, it is possible to achieve both ease of construction and sound insulation.

[0065] (3) The manifold according to the third embodiment is the manifold according to (1) or (2), further comprising a socket pipe that is inserted into the lower connecting pipe from below and protrudes downward from the lower connecting pipe, wherein the lower end of the lower cover is located above the lower end of the socket pipe.

[0066] According to the above configuration, the lower end of the lower cover is positioned above the lower end of the connection pipe. This minimizes the possibility of interference between the lower cover and other pipes when connecting them to the connection pipe. As a result, it is possible to achieve both sound insulation and ease of installation.

[0067] (4) The piping structure according to the fourth embodiment comprises a manifold fitting according to any one embodiment of (1) to (3), a vertical pipe connected to the lower connecting pipe, and a second sound insulation cover covering the vertical pipe from the outside, wherein the lower end of the first sound insulation cover and the second sound insulation cover overlap in the radial direction.

[0068] According to the above configuration, the lower end of the first sound insulation cover and the second sound insulation cover overlap radially. This makes it less likely for gaps to form between the first and second sound insulation covers, thus further improving sound insulation performance. [Explanation of Symbols]

[0069] 10 Manifold joint 20 Soundproof Cover 31. Body 32 sheets 34. First tapered section 36 Locking part 44 Second tapered section 60 Sound insulation structure 61 Cushioning material 90 Socket pipe 100 Second soundproof cover 110 Receptacle 111 Straight pipe section 101 Receiving opening cover 102 Straight pipe cover

Claims

1. An upper connecting pipe having a vertical pipe connection part located on the upper side, and a horizontal pipe connection part provided on the vertical pipe connection part, A tubular lower connecting pipe connected to the upper connecting pipe, which decreases in diameter from top to bottom, The first soundproofing cover covers the upper connecting pipe and the lower connecting pipe from the outside, A manifold fitting comprising, The first soundproof cover is An upper cover that covers the upper connecting pipe from the outside, A lower cover that covers the aforementioned lower connecting pipe from the outside, It has, The lower end of the lower cover is a manifold joint located even lower than the lower end of the lower connecting pipe.

2. The manifold joint according to claim 1, wherein the lower end of the lower cover is located below the lower end of the lower connecting pipe by a range of 10 mm to 15 mm.

3. The lower connecting pipe is further provided with a socket pipe that is inserted from below and protrudes downward from the lower connecting pipe, The manifold joint according to claim 1 or 2, wherein the lower end of the lower cover is located above the lower end of the connection pipe.

4. A manifold joint according to claim 1 or 2, A vertical pipe connected to the lower connecting pipe, A second soundproofing cover covers the aforementioned vertical pipe from the outside, Equipped with, A piping structure in which the lower end of the first sound insulation cover and the second sound insulation cover overlap radially.

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