Method for manufacturing a covered joint and a joint

Abstract

To secure workability and sound insulation performance.SOLUTION: A sound insulation cover 20 has an upper sound insulation cover 21 arranged on an outer surface of an upper connection pipe 11 and a lower sound insulation cover 22 arranged on an outer surface of a lower connection pipe 12. The upper sound insulation cover 21 has a sheet shape formed of an elastic material, and the lower sound insulation cover 22 comprises a pipe body 31 arranged on an outer circumference of the lower connection pipe 12, and a sheet body arranged between the lower connection pipe 12 and the pipe body 31. In a step for attaching the sound insulation cover 20 to a collective joint 1, a step in which the lower connection pipe 12 is inserted through the inside of the lower sound insulation cover 22 and then a step in which the upper sound insulation cover 21 is wound and attached from outside in a radial direction of the upper connection pipe 11, are performed.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a covered mass joint and to a mass joint. [Background technology]

[0002] BACKGROUND ART Conventionally, a sound insulating cover for a mass joint as shown in Patent Document 1 below, for example, has been known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-117245 Summary of the Invention [Problem to be solved by the invention]

[0004] This type of sound-insulating cover is required to have sound-insulating properties and be easy to install.

[0005] The present invention has been made in view of the above-mentioned circumstances, and has as its object to ensure sound insulation and ease of installation. [Means for solving the problem]

[0006] A sound-insulating cover for a collective joint according to one aspect of the present invention includes a pipe body and a sheet body that is attached to the inner peripheral surface of the pipe body in a state where it is deformed into a tubular shape.

[0007] The sound-insulating cover includes a pipe body and a sheet body attached to the inner peripheral surface of the pipe body. Therefore, compared to a case where the sound-insulating cover is a pipe body alone, the sound-insulating performance based on the sheet body can be added to the sound-insulating cover. This ensures the sound-insulating performance of the sound-insulating cover. The sheet body is attached to the inner peripheral surface of the pipe body in a deformed tubular shape. Therefore, during installation, for example, the unfolded sheet body is deformed into a tubular shape and attached to the inner peripheral surface of the pipe body to form the sound-insulating cover, and then the sound-insulating cover can be attached to the collective joint by inserting the collective joint into the sound-insulating cover. This ensures ease of installation compared to, for example, a sound-insulating cover made by wrapping two sheet bodies one by one around a collective joint, or a sound-insulating cover made by previously processing two sheet bodies into a single laminated sheet body and wrapping it around a collective joint.

[0008] The pipe body may be made of a sound-insulating material, and the sheet body may be made of a sound-absorbing material.

[0009] The pipe body is made of a sound-insulating material, and the sheet body is made of a sound-absorbing material. Therefore, for example, sounds generated by drainage water flowing through the manifold can be attenuated by the sound-absorbing sheet body before being transmitted to the pipe body. This effectively ensures the sound-insulating performance of the sound-insulating cover.

[0010] The tubular body may include a first tapered portion, and the sheet body may include a second tapered portion disposed within the first tapered portion.

[0011] The second tapered portion of the sheet body is disposed within the first tapered portion of the pipe body. Therefore, for example, when this sound-insulating cover is applied to a joint having a tapered portion, the tapered portion can be covered by the first tapered portion and the second tapered portion. This allows the sound-insulating cover to be applied to joints having tapered portions.

[0012] An engaging portion may be provided on the inner peripheral surface of the pipe body to engage with the sheet body and restrict movement of the sheet body relative to the pipe body.

[0013] The locking portion is provided on the inner circumferential surface of the pipe and locks onto the sheet body, so that, for example, the sheet body can be easily attached to the inner circumferential surface of the pipe.

[0014] A soundproofing structure for a collective joint according to one aspect of the present invention is a soundproofing structure for a collective joint that includes the sound-insulating cover, and is provided with a buffer material that is fixed to the outer peripheral surface of the collective joint and is positioned between the outer peripheral surface of the collective joint and the inner peripheral surface of the pipe body, separating the outer peripheral surface of the collective joint from the inner peripheral surface of the pipe body.

[0015] The buffer material separates the outer peripheral surface of the joint from the inner peripheral surface of the pipe. This makes it possible to, for example, prevent vibrations generated at the joint due to wastewater flowing through the joint from being transmitted directly to the pipe. This makes it possible to, for example, improve the vibration-proofing performance of the sound-insulating structure. [Effects of the Invention]

[0016] According to the present invention, ease of installation and sound insulation performance can be ensured. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a front view of a group joint according to an embodiment of the present invention. [Figure 2] 2 is a front view showing a covered collective joint equipped with the collective joint shown in FIG. 1. FIG. [Figure 3] FIG. 3 is a top view of the covered collective joint shown in FIG. 2. [Figure 4] 3 is an enlarged longitudinal cross-sectional view of a main part of the covered collective joint shown in FIG. 2. FIG. [Figure 5] FIG. 3 is a vertical cross-sectional view of a sound-insulating cover that constitutes the covered collective joint shown in FIG. 2. [Figure 6] 6A and 6B are a front view and a development view of a sheet body constituting the sound-insulating cover shown in FIG. 5. DETAILED DESCRIPTION OF THE INVENTION

[0018] A covered collective joint 1 (covered collective pipe joint) according to one embodiment of the present invention will be described below with reference to Figures 1 to 6. The covered collective joint 1 is used, for example, for building drainage, and is placed in a slab penetration hole formed in a floor slab (not shown). As shown in FIGS. 1 and 2, the covered collective joint 1 according to this embodiment includes a collective joint 10 (collective pipe joint) and a sound-insulating cover 20 that covers the collective joint 10.

[0019] The manifold 10 includes 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 connectable to a first vertical pipe P1, and a horizontal pipe connecting portion 14 protruding from the side of the vertical pipe connecting portion 13 and connectable to a horizontal pipe P3. The first vertical pipe P1 is connected to the upper end of the upper connecting pipe 11.

[0020] In the following description, the direction along the central axis O of the vertical pipe connecting part 13 is referred to as the axial direction, the upper connecting pipe 11 side of the vertical pipe connecting part 13 along the axial direction is referred to as the upper side, and the lower connecting pipe 12 side is referred to as the lower side. In addition, in a plan view seen from the axial direction, the direction perpendicular to the central axis O is referred to as the radial direction, and the direction going around the central axis O is referred to as the circumferential direction.

[0021] 3, the horizontal pipe connecting portion 14 extends radially outward from the peripheral wall of the vertical pipe connecting portion 13. In the illustrated example, three horizontal pipe connecting portions 14 are arranged. Two of the three horizontal pipe connecting portions 14 are disposed at positions on either side of the central axis O in the radial direction. The remaining horizontal pipe connecting portions 14 extend in a direction that forms an angle of 90° in top view with the respective extension directions of the two horizontal pipe connecting portions 14. Note that the number and extension directions of the horizontal pipe connecting portions 14 are not limited to this embodiment and can be changed as desired. 1, connecting rings 15, to which the horizontal pipes P3 are individually connected, are attached to the radially outer ends of the horizontal pipe connecting portions 14. The outer diameter of the connecting rings 15 is larger than the outer diameter of the horizontal pipe connecting portions 14.

[0022] The lower connecting pipe 12 is tubular and has a smaller diameter below than above. The lower connecting pipe 12 includes a connecting pipe section 16 located at its upper end and connected to the lower side of the upper connecting pipe 11, an inclined pipe section 17 connected to the lower side of 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, inclined pipe section 17, and lower pipe section 18 are integrally formed by, for example, injection molding of a synthetic resin material.

[0023] The outer diameter of the connecting pipe portion 16 is smaller than the outer diameter of the vertical pipe connecting portion 13 of the upper connecting pipe 11. The peripheral wall of the connecting pipe portion 16 is fitted inside the vertical pipe connecting portion 13. The outer diameter of the upper end portion of the inclined pipe portion 17 is smaller than the outer diameter of the connecting pipe portion 16. The outer diameter of the lower end portion of the inclined pipe portion 17 is smaller than the outer diameter of the connecting pipe portion 16. The axial size of the inclined pipe portion 17 is larger than the axial size of the connecting pipe portion 16.

[0024] The connecting pipe portion 16 contains a resin composition containing a polyvinyl chloride resin and thermally expandable graphite. That is, the connecting pipe portion 16 is produced by molding the resin composition. Typically, the connecting pipe portion 16 is produced by extrusion molding the resin composition. The connecting pipe part 16 may have a single-layer structure in which the entire connecting pipe part 16 is made of a resin composition, or may have a multi-layer structure made of multiple layers. In the case of a multi-layer structure, it is sufficient that any one of the layers is made of a resin composition. For example, when the connecting pipe part 16 has a three-layer structure made of a surface layer, an intermediate layer, and an inner layer, the intermediate layer may be made of a resin composition, and the surface layer, intermediate layer, and inner layer may contain a heat-absorbing agent.

[0025] The intermediate layer is black because it contains thermally expandable graphite, so it is preferable that the surface layer and the inner layer contain a colorant other than black 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 layer is 0.3 mm or more, the mechanical strength of the pipe can be sufficiently ensured, and if it is 3.0 mm or less, a decrease in fire resistance can be suppressed. Furthermore, it is preferable that the connection pipe portion 16 meets the performance requirements set forth in JIS K6741.

[0026] The outer diameter of the lower pipe portion 18 is smaller than the outer diameter of the connecting pipe portion 16 and larger than the outer diameter of the lower end portion of the inclined pipe portion 17. The axial size of the lower pipe portion 18 is smaller than the axial size of the connecting pipe portion 16. The second vertical pipe P2 is fitted into the inside of the lower pipe portion 18 from below, thereby connecting the second vertical pipe P2 to the lower connecting pipe 12.

[0027] The upper connecting pipe 11 and the lower connecting pipe 12 may be made transparent, which allows the connection state of the upper connecting pipe 11 and the lower connecting pipe 12 to be visually confirmed. Furthermore, the upper connecting pipe 11 and the lower connecting pipe 12 may be compounded with a flame retardant such as non-thermally expandable graphite or magnesium hydroxide.

[0028] 2, the sound-insulating cover 20 is flexible and includes an upper sound-insulating cover 21 wrapped around the upper connecting pipe 11 from the outside in the radial direction, and a tubular lower sound-insulating cover 22 through which the lower connecting pipe 12 is inserted. The lower end of the upper connecting pipe 11 is disposed within the upper end of the lower sound-insulating cover 22. The lower end of the upper sound-insulating cover 21 is wrapped around the upper end of the lower sound-insulating cover 22 from the outside in the radial direction.

[0029] The upper sound-insulating cover 21 is formed into a sheet from an elastic material such as modified asphalt, elastomer, rubber, polyolefin resin, or soft vinyl chloride resin. The upper sound-insulating cover 21 may contain an inorganic material such as calcium carbonate or barium sulfate, a metal sheet such as iron or lead, or metal powder. The thickness of the upper sound-insulating cover 21 is preferably 1.0 mm or more and 5.0 mm or less, and more preferably 1.5 mm or more and 4.0 mm or less. Furthermore, a surface material such as a synthetic fiber nonwoven fabric or a glass fiber nonwoven fabric may be laminated on one or both sides of the upper sound-insulating cover 21.

[0030] As shown in FIGS. 4 and 5, the lower sound-insulating cover 22 includes a tubular body 31 and a sheet body 32 that is attached to the inner peripheral surface of the tubular body 31 in a tubular shape. As shown in FIG. 5, the axis of the pipe 31 is located on the central axis O of the vertical pipe joint 13, and the axial direction of the pipe 31 is parallel to the axial direction. The size of the pipe 31 in the axial direction is, for example, about 283 mm. The thickness of the pipe 31 is preferably, for example, about 1 to 5 mm. The surface density of the pipe 31 is 1 to 8 kg / m 2 It is preferable that:

[0031] When the pipe body 31 is backfilled in the floor slab when the covered collective joint 1 is installed in the floor slab, and for example, when the diameter of the slab penetration hole is 209 mm, it is preferable that the outer diameter of the pipe body 31 is approximately 165 to 190 mm. Note that in the illustrated example, the pipe body 31 has a circular pipe shape, but the pipe body 31 may also have a polygonal pipe shape, for example.

[0032] The tubular body 31 includes a first upper tubular portion 33, a first tapered portion , and a first lower tubular portion . 5, the first upper tubular portion 33 has a constant diameter over the entire axial length. The outer diameter of the first upper tubular portion 33 is, for example, about 170 mm. The first tapered section 34 is connected to the first upper tubular section 33 in the axial direction, and tapers away from the first upper tubular section 33. Specifically, the first tapered section 34 is connected to the lower end of the first upper tubular section 33, and the diameter thereof decreases downward.

[0033] 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 disposed on the opposite side of the first upper pipe section 33 across the first tapered section 34 in the axial direction, and is positioned lower than the first upper pipe section 33. The inner diameter of the first lower pipe section 35 is uniform over the entire axial length. The outer diameter of the first lower pipe section 35, excluding the lower end, is uniform over the entire axial length. The outer diameter of this portion (the maximum outer diameter of the first lower pipe section 35) is, for example, approximately 150 mm.

[0034] The outer peripheral surface of the lower end of the first lower pipe portion 35 is chamfered. At the lower end of the first lower pipe portion 35, the outer diameter decreases downward, and the wall thickness decreases downward. The outer peripheral surface of the lower end of the first lower pipe portion 35 forms an inclined surface 35a that is inclined with respect to the central axis O (axial direction) in a vertical cross-sectional view along the axial direction.

[0035] The first upper pipe section 33, the first tapered section 34, and the first lower pipe section 35 are arranged consecutively in this order from top to bottom (along the axial direction). As shown in Fig. 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.

[0036] As shown in FIG. 5, a locking portion 36 (positioning rib) is provided on the inner peripheral surface of the tubular body 31. The locking portion 36 protrudes from the inner peripheral surface of the tubular body 31. The locking portion 36 is formed in an annular shape extending over the entire circumference in the circumferential direction. The locking portion 36 is provided on the first lower tubular portion 35. The locking portion 36 is located below the axial center of the first lower tubular portion 35. The locking portion 36 is located above the lower end portion (inclined surface 35a) of the first lower tubular portion 35.

[0037] The locking portion 36 is preferably disposed, for example, at a position approximately 5 to 20 mm axially away from the lower edge of the first lower pipe portion 35. In the illustrated example, the protrusion amount (radial size) and thickness (axial size) of the locking portion 36 are equal to the thickness of the first lower pipe portion 35 excluding the lower end portion. The protrusion amount and thickness of the locking portion 36 are both preferably, for example, approximately 2 to 8 mm. However, from the viewpoint of molding and construction, the protrusion amount and thickness of the locking portion 36 are both preferably approximately 3 mm.

[0038] The pipe body 31 is made of a sound-insulating material. The sound-insulating properties of the pipe body 31 are higher than those of a sound-absorbing material, which will be described later. The pipe body 31 is integrally molded by, for example, injection molding, pressure molding, blow molding, vacuum molding, or the like. The pipe body 31 is made 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).

[0039] The inorganic filler is not particularly limited, but examples thereof 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, dawnnite, 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 balun, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balun, 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, and dewatered sludge. Of these, calcium carbonate is preferably used as the inorganic filler in view of the balance between weight and cost. These may be used alone or in combination of two or more.

[0040] The olefin resin is not particularly limited, but examples thereof include low-density polyethylene, high-density polyethylene, linear low-density polyethylene, atactic polypropylene, isotactic polypropylene, syndiotactic polypropylene, and poly-α-olefin. 3 The olefin resin is preferably polyethylene having a density of 0.87 g / cm. 3 If the density is less than 0.93 g / cm 3 , the strength of the tube body 31 is insufficient. 3 If the bending modulus of elasticity of the olefin resin is more than 100 to 3000 kg / cm, the tubular body 31 may buckle when flattened (when an axial force is applied to the tubular body 31). 2 The strength and winding processability are sufficient if the material is of a material other than an olefin-based material, such as polyvinyl chloride resin, polystyrene resin, ABS resin, AS resin, or elastomer material.

[0041] The sheet body 32 is deformed into a tubular shape inside the tubular body 31. However, the sheet body 32 can be developed into a flat shape when removed from the tubular body 31, as shown in Fig. 6. The sheet body 32 has flexibility to the extent that it can be deformed from a flat shape into a tubular shape. In the following, when describing the sheet body 32 in an unfolded state, when the sheet body 32 is deformed into a tubular shape and placed inside the tubular body 31, the axial direction is referred to as the Y direction, the circumferential direction is referred to as the X direction, the direction that is upward in the axial direction is referred to as the first side Y1 in the Y direction, and the direction that is downward is referred to as the second side Y2 in the Y direction.

[0042] In the unfolded state, the sheet body 32 is longer in the X direction than in the Y direction in a plan view of the sheet body 32. The sheet body 32 is formed in a hexagonal shape that is symmetrical in the X direction. The sheet body 32 is symmetrical with respect to a reference line L that passes through the center of the sheet body 32 in the X direction and extends in the Y direction. The thickness of the sheet body 32 is uniform throughout, and is preferably about 1 to 20 mm. The surface density of the sheet body 32 is 0.1 to 2 kg / m 2 The degree is preferable. The sheet body 32 has a first region 37 and a second region 38. The first region 37 corresponds to the first upper tube portion 33 of the tube body 31, and the second region 38 corresponds to the first tapered portion 34 and the first lower tube portion 35 of the tube body 31.

[0043] The first region 37 is located on the first side Y1 of the second region 38. The first region 37 is smaller in the Y direction and larger in the X direction than the second region 38. The length of the first region 37 in the Y direction is equal to the axial length of the first upper tube portion 33. The first axial edge 39 located on the first side Y1 in the first region 37 extends linearly in the X direction. The length of the first axial edge 39 is equal to the circumferential length of the inner circumferential surface of the first upper tube portion 33 of the tube body 31. The first region 37 becomes smaller in the X direction toward the second side Y2. A pair of first peripheral edges 40 located on both sides of the first region 37 in the X direction extend in a direction inclined with respect to the Y direction. The first peripheral edges 40 may also extend parallel to the Y direction.

[0044] The second region 38 becomes smaller in the X direction toward the second side Y2. A pair of second peripheral edges 41 located on both sides in the X direction of the second region 38 extend in a direction inclined with respect to the Y direction. The inclination angle θ2 of the second peripheral edge 41 with respect to an imaginary line extending in the Y direction is larger than the inclination angle θ1 of the first peripheral edge 40 with respect to the imaginary line. The second axial edge 42 located on the second side Y2 in the second region 38 is formed in an arc shape (curved shape) that convex toward the first side Y1. The second axial edge 42 approaches the first side Y1 as it moves from the outer side toward the center in the X direction. The length of the second axial edge 42 is equal to the circumferential length of the inner circumferential surface of the first lower tube section 35 of the tube body 31.

[0045] The Y-direction length d0 of the sheet body 32 (the length along the Y-direction between the center in the X-direction of the first axial end edge 39 and the center in the X-direction of the second axial end edge 42) is equal to or greater than the axial length d1 from the upper edge of the first upper tube section 33 of the tube body 31 to the lower edge of the first tapered section 34, as shown in Figure 5, and is equal to or less than the axial length d2 from the upper edge of the tube body 31 to the locking section 36.

[0046] When a sheet body 32 as shown in Fig. 6 is deformed (rolled) so that a pair of first peripheral edges 40 and a pair of second peripheral edges 41 abut or overlap each other, the sheet body 32 is deformed into a tubular shape with the first axial edge 39 as the upper edge and the second axial edge 42 as the lower edge, as shown in Fig. 5. At this time, the first region 37 becomes the second upper tubular portion 43 disposed within the first upper tubular portion 33, and the second region 38 becomes the second tapered portion 44 disposed within the first tapered portion 34. The sheet body 32 may have cuts or the like formed therein to facilitate the deformation of the sheet body 32 into a tubular shape.

[0047] The tubular sheet body 32 is deformed so as to fit the inner peripheral surface of the tubular body 31. The sheet body 32 may have wrinkles or the like formed thereon. The second tapered portion 44 is connected to the second upper tubular portion 43 in the axial direction, and tapers away from the second upper tubular portion 43. Specifically, the second tapered portion 44 is connected to the lower end of the second upper tubular portion 43, and the diameter thereof decreases downward.

[0048] The length of the second tapered portion 44 and the inclination angle with respect to the axial direction are determined appropriately depending on the length of the second axial edge 42 and the length in the Y direction of the sheet body 32. In this embodiment, the lower end of the second tapered portion 44 is disposed within the first lower tube portion 35, and the second axial edge 42 is engaged with the engaging portion 36 from above.

[0049] 4, the portion of the second tapered portion 44 located within the first lower pipe portion 35 is deformed radially outward by the lower connecting pipe 12 (lower pipe portion 18) when the lower connecting pipe 12 is disposed within the lower sound-insulating cover 22. As a result, this portion becomes the second lower pipe portion 45 that is disposed within the first lower pipe portion 35. The second lower pipe portion 45 is formed by sandwiching the second region 38 of the sheet body 32, which has been deformed into a tubular shape, between the outer peripheral surface of the collective joint 10 and the inner peripheral surface of the pipe body 31. The second lower pipe section 45 extends downward from the lower end of the second tapered section 44. The second lower pipe section 45 is disposed on the opposite side of the second upper pipe section 43 across the second tapered section 44 in the axial direction, and is positioned lower than the second upper pipe section 43.

[0050] The shape of the sheet body 32 is preferable from the viewpoint of sound insulation and vibration damping performance, but is not particularly limited. For example, when only the first upper pipe section 33 is backfilled into the floor slab (when the first tapered section 34 and the first lower pipe section 35 protrude downward from the floor slab), a configuration in which the sheet body 32 is provided only within the first upper pipe section 33 may be adopted. This allows for reduction in production costs. In this case, in the first tapered section 34 and the first lower pipe section 35, the gap between the outer peripheral surface of the collective joint 10 and the inner peripheral surface of the pipe body 31 may be equal to or less than the thickness of the pipe body 31, and it is preferable that the outer peripheral surface of the collective joint 10 and the inner peripheral surface of the pipe body 31 do not come into direct contact. If a thermal expansion pipe is provided in the joint assembly 10, it is preferable that no gap is formed between the lower sound insulating cover 22 and the thermal expansion pipe in order to ensure fire resistance.

[0051] The sheet body 32 is made of a sound-absorbing material. The sound absorption properties of a sound-absorbing material are higher than those of a sound-insulating material. The sheet body 32 is made of a porous material, such as glass wool, rock wool, felt, urethane foam, polyethylene foam, or polypropylene foam. Of these, glass wool is suitable for the sheet body 32 in terms of fire resistance, sound insulation, vibration damping, and cost. In the lower sound-insulating cover 22, the locking portion 36 locks onto the sheet body 32 to restrict 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 downward movement of the sheet body 32 relative to the pipe body 31.

[0052] The sound-insulating cover 20 forms a sound-insulating structure 60 for the collective joint. The sound-insulating structure 60 further includes a buffer material 61. The buffer material 61 is fixed (anchored) to the outer peripheral surface of the collective joint 10. The buffer material 61 is disposed between the outer peripheral surface of the collective joint 10 and the inner peripheral surface of the pipe body 31. The buffer material 61 separates the outer peripheral surface of the collective joint 10 from the inner peripheral surface of the pipe body 31, thereby separating the collective joint from the pipe body 31. The buffer material 61 supports the locking portion 36 from below. The buffer material 61 prevents the lower sound-insulating cover 22 from coming off the collective joint 10.

[0053] The buffer material 61 is made of foam tape (for example, foamed polyethylene, foamed polyurethane, foamed polystyrene, etc.). The buffer material 61 is formed by wrapping foam tape around the joint. The surface density of the buffer material 61 is lower than the surface density of the pipe body 31. The surface density of the buffer material 61 is 0.5 to 1.0 kg / m 2 The cushioning material 61 is not limited to the above materials, and may be made of rubber or other materials.

[0054] The following describes an example of a method for attaching the sound-insulating cover 20 to the joint assembly 10. Note that this is just one example, and it is also possible to attach the lower sound-insulating cover 22 to the joint assembly by other methods.

[0055] First, the lower sound-insulating cover 22 is attached to the lower connecting pipe 12. The worker rolls up the unfolded sheet body 32 into a tubular shape and attaches it to the inner circumferential surface of the pipe body 31 to form the lower sound-insulating cover 22 (first step). At this time, the worker inserts the tubular sheet body 32 from above the pipe body 31 and locks the second axial end edge 42 of the sheet body 32 into the locking portion 36, for example.

[0056] Thereafter, the worker inserts the lower connecting pipe 12 into the lower sound-insulating cover 22 (second step). Then, the worker fixes the buffer material 61 to the lower connecting pipe 12 by, for example, attaching it (third step). This causes the buffer material 61 to engage with the engaging portion 36 of the pipe body 31, preventing the lower sound-insulating cover 22 from coming off the joint assembly 10.

[0057] The second and third steps can be performed, for example, with the collective joint 10 turned upside down. In this case, workability can be improved by, for example, attaching the lower sound-insulating cover 22 from above to the upside-down collective joint 10.

[0058] Thereafter, the upper sound-insulating cover 21 is attached to the upper connecting pipe 11. As a result, the sound-insulating cover 20 is attached to the joint assembly 10, and the joint assembly 1 with cover is completed.

[0059] As described above, according to the sound-insulating cover 20 and sound-insulating structure 60 of this embodiment, the lower sound-insulating cover 22 includes the pipe body 31 and the sheet body 32 attached to the inner peripheral surface of the pipe body 31. Therefore, compared to when the lower sound-insulating cover 22 is the pipe body 31 alone, for example, it is possible to add sound-insulating performance based on the sheet body 32 to the lower sound-insulating cover 22. This makes it possible to ensure the sound-insulating performance of the lower sound-insulating cover 22.

[0060] The sheet body 32 is attached to the inner peripheral surface of the pipe body 31 in a deformed tubular shape. Therefore, during construction, for example, the unfolded sheet body 32 is deformed into a tubular shape and attached to the inner peripheral surface of the pipe body 31 to form the lower sound-insulating cover 22, and then the collective joint 10 can be inserted into the lower sound-insulating cover 22, thereby attaching the lower sound-insulating cover 22 to the collective joint 10. This ensures ease of construction compared to, for example, a lower sound-insulating cover formed by wrapping two sheet bodies one by one around a collective joint, or a lower sound-insulating cover formed by processing two sheet bodies into a single laminated sheet body in advance and wrapping it around a collective joint.

[0061] The pipe body 31 is made of a sound-insulating material, and the sheet body 32 is made of a sound-absorbing material. Therefore, for example, sound generated by drainage water flowing through the joint assembly 10 can be attenuated by the sheet body 32, which is a sound-absorbing material, and then transmitted to the pipe body 31. This effectively ensures the sound-insulating performance of the lower sound-insulating cover 22.

[0062] The second tapered portion 44 of the sheet body 32 is disposed within the first tapered portion 34 of the pipe body 31. Therefore, for example, when this lower sound-insulating cover 22 is applied to a joint assembly 10 including an inclined pipe portion 17 (tapered portion) as in this embodiment, the inclined pipe portion 17 can be covered by the first tapered portion 34 and the second tapered portion 44. This allows the lower sound-insulating cover 22 to be applied to a joint assembly 10 that includes an inclined pipe portion 17.

[0063] The locking portion 36 is provided on the inner peripheral surface of the tubular body 31 and locks onto the sheet body 32. Therefore, for example, the sheet body 32 can be easily attached to the inner peripheral surface of the tubular body 31.

[0064] The buffer material 61 separates the outer peripheral surface of the collective joint 10 from the inner peripheral surface of the pipe body 31. Therefore, for example, it is possible to suppress vibrations generated in the collective joint 10 due to wastewater flowing through the collective joint 10 from being transmitted directly to the pipe body 31. This makes it possible to improve the vibration-proofing performance of the sound insulation structure 60, for example.

[0065] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0066] The tube body 31 and the sheet body 32 do not necessarily have to have the first tapered portion 34 and the second tapered portion 44 . The locking portion 36 and the buffer material 61 may be omitted.

[0067] In addition, within the scope of the spirit of the present invention, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described modifications may be combined as appropriate. [Explanation of symbols]

[0068] 10. Collective joint 20 Soundproof cover 31 Body 32 Sheet body 34 First tapered section 36 Locking part 44 Second tapered section 60 Soundproofing structure 61 Cushioning material

Claims

1. A method for manufacturing a covered collective joint, comprising: an upper connecting pipe having a horizontal pipe connection portion; and a lower connecting pipe connected to the upper connecting pipe, having a tubular shape with a diameter smaller at the bottom than at the top, and made of a synthetic resin material, and having a sound-insulating cover attached to the outer surface of the collective joint, the sound-insulating cover includes an upper sound-insulating cover disposed on an outer surface of the upper connecting pipe and a lower sound-insulating cover disposed on an outer surface of the lower connecting pipe, The upper sound-insulating cover is a sheet-like cover made of an elastic material, the lower sound-insulating cover includes a pipe body disposed on an outer periphery of the lower connecting pipe, and a sheet body disposed between the lower connecting pipe and the pipe body, The step of attaching the sound-insulating cover to the collective joint includes: inserting the lower connecting pipe into the lower sound insulating cover; Next, a step of wrapping the upper sound-insulating cover around the upper connecting pipe from the radially outer side and attaching it is performed. A manufacturing method for a covered joint.

2. The method for manufacturing a covered manifold according to claim 1 , wherein the upper end of the pipe body is disposed on the outer circumferential surface of the upper connecting pipe, the upper connecting pipe being below the horizontal pipe connecting portion.

3. The sheet body is deformed so that the edges of the sheet body butt against each other and attached to the inner circumferential surface of the pipe body. A method for manufacturing the covered joint according to claim 1 or 2.

4. The step of inserting the lower connecting pipe into the lower sound-insulating cover includes turning the collective joint upside down and attaching the lower sound-insulating cover from above to the collective joint in the upside-down state. A method for manufacturing the covered mass joint according to any one of claims 1 to 3.

5. A method for manufacturing a covered collective joint, comprising: an upper connecting pipe having a horizontal pipe connection portion; a lower connecting pipe connected to the upper connecting pipe, having a tubular shape with a diameter smaller at the bottom than at the top and made of a synthetic resin material; and a lower sound-insulating cover attached to the outer surface of the lower connecting pipe, the method comprising the steps of: The upper sound-insulating cover is a sheet-like cover made of an elastic material, the lower sound-insulating cover includes a pipe body disposed on an outer periphery of the lower connecting pipe, and a sheet body disposed between the lower connecting pipe and the pipe body, The step of attaching the upper sound-insulating cover to the collective joint includes: a step of wrapping the upper sound-insulating cover around the upper connecting pipe from the radially outer side and attaching the upper sound-insulating cover; A manufacturing method for a covered joint.

6. The method for manufacturing a covered collective joint according to claim 5, wherein the upper end of the pipe body is disposed on the outer peripheral surface of the upper connecting pipe, which is below the horizontal pipe connecting portion.

7. A method for manufacturing a covered collective joint as described in Claim 6, wherein the lower end of the upper sound-insulating cover is positioned so as to overlap the upper end of the lower sound-insulating cover.

8. A covered collective joint having an upper connecting pipe having a horizontal pipe connection portion, and a lower connecting pipe connected to the upper connecting pipe, having a tubular shape with a diameter smaller at the bottom than at the top and made of a synthetic resin material, and a sound-insulating cover attached to the outer surface of the collective joint, the sound-insulating cover includes an upper sound-insulating cover disposed on an outer surface of the upper connecting pipe and a lower sound-insulating cover disposed on an outer surface of the lower connecting pipe, The upper sound-insulating cover is a sheet-like cover made of an elastic material, the lower sound-insulating cover includes a pipe body disposed on an outer periphery of the lower connecting pipe, and a sheet body disposed between the lower connecting pipe and the pipe body, an upper end portion of the pipe body is disposed on an outer circumferential surface of the upper connecting pipe, the upper connecting pipe being lower than the horizontal pipe connecting portion; The sheet body is attached to the inner circumferential surface of the pipe body so that the end edges of the sheet body abut against each other. Collective joint.

9. 9. The assembly joint according to claim 8, wherein the lower connecting pipe has an inclined pipe portion whose diameter gradually decreases downward, and there is a gap between the inner surface of the sheet body and the outer surface of the inclined pipe portion.

10. the pipe body has an upper pipe portion that covers the lower end of the upper connecting pipe, and a tapered portion that is continuous with the lower end of the upper pipe portion and reduces in diameter downward to cover the inclined pipe portion, the upper pipe portion and the tapered portion being integrally molded from an elastic resin material; a size of the upper pipe portion in the central axis direction of the upper connecting pipe is smaller than a size of the tapered portion in the central axis direction of the upper connecting pipe; The assembly joint according to claim 9.

11. The tubular body includes a locking portion formed by protruding in an annular shape and extending from an inner circumferential surface of the tubular body over the entire circumferential direction. The assembly joint according to any one of claims 8 to 10.

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