Piping structure, sanitary bend, and construction method

Abstract

To provide a technique capable of reducing drain sound generated from a sanitary bend.SOLUTION: The piping structure includes a sanitary bend 5 provided between the toilet bowl 3 and the collecting pipe 2. The sanitary bend 5 includes a bend portion 15, a straight pipe portion 16, and a first acoustic insulation cover 12 covering at least the straight pipe portion 16.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a piping structure, a sanitary bend, and a construction method. [Background technology]

[0002] For example, a well-known example of a piping structure is the building drainage system used in condominiums and hotels. This piping structure generally employs a single-pipe drainage system, with a collecting pipe fitted with a swirl vane. In low-rise apartments, a general DV fitting without a swirl vane may also be used. The collecting pipe is installed within the pipe space within the room, and wastewater from the drainage fixtures in the rooms on each floor flows down to the collecting pipe via a sanitary bend. The sanitary bend connected to the toilet may be an underfloor pipe, but may also be an above-floor pipe for ease of maintenance. When the sanitary bend is an above-floor pipe, it is installed between the toilet and the collecting pipe (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-53640 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, the demand for sound insulation has increased in condominiums, and there are an increasing number of cases where soundproofing treatment is required for drainage pipes. There is also an increasing demand for quiet drainage noise in toilet rooms (hereinafter referred to as toilets). In addition, with the improvement in fire resistance in recent years, resin materials have become the mainstream for drainage pipes at fire compartment penetration points, replacing metal materials. Sanitary bends are also often made of PVC material. For this reason, in properties such as condominiums where high sound insulation is required, there have been an increasing number of cases where problems have arisen in toilets, such as draining noise from the sanitary vent when draining water from the floor above, making it necessary to take sound insulation measures.

[0005] Sanitary bends are available in straight types, but in some cases, bent types (such as 90-degree bends) are used to allow for greater flexibility in piping installation (for example, easier slope creation). Sanitary bends are also installed in narrow spaces behind the toilet, which can make it difficult to rewind them after installation, for example, at renovation sites. Furthermore, residents may clean behind the toilet, so the way the soundproofing cover is wrapped can be important to ensure its appearance is clean.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide a technology that can reduce drainage noise generated from a sanitary bend. [Means for solving the problem]

[0007] A piping structure according to one aspect of the present invention is a piping structure having a sanitary bend provided between a toilet and a collecting pipe, the sanitary bend having a bend section, a straight pipe section, and a sound-insulating cover that covers at least the straight pipe section. [Effects of the Invention]

[0008] According to the present invention, the drainage noise generated from a sanitary bend can be reduced. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a plan view showing a piping structure according to a first embodiment of the present invention. [Figure 2] 1 is a plan view showing a sanitary bend according to a first embodiment of the present invention. FIG. [Figure 3] 3 is a plan view showing the sound-insulating sheet with the first sound-insulating cover of FIG. 2 unfolded. FIG. [Figure 4]FIG. 10 is a perspective view showing a second sound insulating cover according to a second embodiment of the present invention. [Figure 5] FIG. 10 is a plan view showing a sanitary bend according to a third embodiment of the present invention. [Figure 6] 6 is a plan view showing the sound-insulating sheet with the third sound-insulating cover of FIG. 5 unfolded. FIG. [Figure 7] FIG. 10 is a plan view showing a sanitary vent according to a fourth embodiment of the present invention, in which the first sound-insulating cover is omitted. [Figure 8] FIG. 8 is a plan view showing the first sound-insulating sheet with the first sound-insulating part of FIG. 7 unfolded. [Figure 9] 9 is a plan view showing a state in which the first sound insulating sheet of FIG. 8 is placed in a bent portion. FIG. [Figure 10] 9 is a plan view showing the state in which the first sound-insulating sheet of FIG. 8 is wrapped around a bent portion. FIG. [Figure 11] 9 is a plan view showing the state in which the first sound insulating sheet of FIG. 8 is wrapped around a bent portion. FIG. [Figure 12] 8 is a plan view showing the second sound-insulating sheet in which the second sound-insulating part in FIG. 7 is unfolded. FIG. [Figure 13] FIG. 10 is a plan view showing a sanitary bend according to a fifth embodiment of the present invention. [Figure 14] 14 is a plan view showing the first sound-insulating part of FIG. 13 and the first sound-insulating sheet and second sound-insulating sheet with the first sound-insulating part unfolded. FIG. [Figure 15] FIG. 14 is a plan view showing the long sheet of FIG. [Figure 16] FIG. 14 is a plan view showing the curved sheet of FIG. [Figure 17] FIG. 14 is a plan view showing the second sound-insulating sheet of FIG. [Figure 18] FIG. 10 is a plan view showing a sound-insulating sheet according to a sixth embodiment of the present invention. [Figure 19] FIG. 10 is a plan view showing a sanitary bend according to a seventh embodiment of the present invention. [Figure 20] 20 is a plan view showing an example in which the seventh sound insulating cover of FIG. 19 is fitted into a connection receiving portion and a bend portion. FIG. [Figure 21]20 is a plan view showing an example in which the seventh sound insulating cover of FIG. 19 is fitted into a connection receiving portion and a bend portion. FIG. [Figure 22] 22 is a side view of the sanitary bend of FIG. 21 as viewed from the arrow A. FIG. [Figure 23] FIG. 13 is a plan view showing a sanitary bend according to an eighth embodiment of the present invention. [Figure 24] FIG. 13 is a plan view showing a sanitary bend according to a ninth embodiment of the present invention. [Figure 25] FIG. 10 is a side view showing the position of the tape to which the sound-insulating sheet is attached. [Figure 26] FIG. 19 is a plan view showing a sanitary bend according to a tenth embodiment of the present invention. [Figure 27] FIG. 22 is a plan view showing a sanitary bend according to an eleventh embodiment of the present invention. [Figure 28] FIG. 22 is a plan view showing a sanitary bend according to a twelfth embodiment of the present invention. [Figure 29] FIG. 22 is a plan view showing a sanitary bend according to a thirteenth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] A piping structure, a sanitary bend, and an installation method according to one embodiment of the present invention will be described below with reference to the drawings. An example in which a sound-insulating cover is pre-wrapped in a factory or the like before the piping structure is installed at a new construction site will be described below with reference to Figs. 1 to 23. An example in which a sound-insulating cover is post-wrapped at a renovation site will be described with reference to Figs. 24 to 29.

[0011] First, examples of installing a sound-insulating cover in advance by pre-winding in a factory or the like before the construction of a piping structure at a new construction site will be described in the first to eighth embodiments shown in Fig. 1 to Fig. 23. Here, "pre-winding" includes, for example, wrapping a sound-insulating sheet, fitting a cylindrical sound-insulating cover, attaching a half sound-insulating cover, and the like before construction. In the second to eighth embodiments, components that are the same as or similar to those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0012] (First embodiment) The first embodiment will be described with reference to FIGS. As shown in FIG. 1, the piping structure 1 is used for drainage in a building 200. The piping structure 1 includes, for example, a collecting pipe 2, a toilet 3, and a sanitary bend 5. The collecting pipe 2 is provided in a pipe space 201 (hereinafter sometimes referred to as PS201) of the building 200. The collecting pipe 2 is a vertical drainage pipe that penetrates a floor slab (not shown) of the building 200 and is arranged on each floor of the building 200. The collecting pipe 2 has a structure that includes, for example, a collecting joint 7 made of resin or cast iron. Note that the collecting pipe 2 also includes pipes that include a general DV joint. The collecting pipe 2 is connected to the toilet 3 in each dwelling unit via a sanitary bend 5. Water drained from the toilet 3 is guided to the collecting pipe 2 via the sanitary bend 5 and flows down the collecting pipe 2 to be drained. The toilet bowl 3 is provided on a floor 203 in a toilet (toilet room) 202. The toilet 202 is partitioned by the floor 203, a back wall 204, and a wall 205 of the PS 201. A through-hole 206 is provided in the wall 205 of the PS 201.

[0013] As shown in Figures 1 and 2, a sanitary bend 5 is used in a piping structure 1. The sanitary bend 5 is provided, for example, between a toilet 3 and a collecting pipe 2. The sanitary bend 5 and the collecting pipe 2 do not have to be directly connected; for example, a pipe or a joint may be provided between them. The sanitary bend 5 is installed on a floor 203 of a building 200. The sanitary bend 5 includes a pipe body 11 and a first sound-insulating cover (sound-insulating cover) 12. The pipe body 11 includes a connection receiving portion 14, a bend portion 15, and a straight pipe portion 16. The pipe body 11 is, for example, a VP (polyvinyl chloride pipe) in which the connection receiving portion 14, the bend portion 15, and the straight pipe portion 16 are integrally molded from a resin material. When the pipe body 11 is a VP, the drainage noise increases, so the sound insulation effect of the first sound insulation cover 12 described below can be appropriately achieved.

[0014] The connection receiving portion 14 is formed in a cylindrical (annular) shape corresponding to the shape of the drain outlet 3a of the toilet 3. The connection receiving portion 14 is connected to the drain outlet 3a. The bend portion 15 is formed with a circular cross section. One end 15a of the bend portion 15 is continuous with the connection receiving portion 14. When placed on the floor 203, the bend portion 15 is bent at 90 degrees along the floor 203. The bend portion 15 protrudes from the drain outlet 3a of the toilet 3 toward the rear wall 204. The other end 15b of the bend portion 15 is continuous with one end 16a of the straight pipe portion 16. The straight pipe section 16 is formed in a cylindrical shape with a circular cross section. When placed on the floor 203, the straight pipe section 16 extends linearly along the floor 203 and the rear wall 204. The other end 16b of the straight pipe section 16 passes through a through-hole 206 in a wall 205 of the PS 201 and is connected to the collecting joint 7 of the collecting pipe 2.

[0015] That is, the pipe body 11 is a type of pipe bent at 90 degrees by the connection receiving portion 14, the bend portion 15, and the straight pipe portion 16. The pipe body 11 is located on the floor 203 and is arranged along the floor 203. The pipe body 11 is also arranged between the toilet bowl 3 and the rear wall 204. The space between the toilet bowl 3 and the rear wall 204 is relatively narrow. Therefore, since the pipe body 11 has the bend portion 15 as a bending portion, it is generally difficult to install a sound-insulating cover. Therefore, it was decided to provide a first sound-insulating cover 12 on the straight pipe portion 16 of the pipe body 11.

[0016] The pipe body 11 guides water drained from the toilet bowl 3 to the collecting pipe 2. The water guided to the collecting pipe 2 flows down the collecting pipe 2 and is drained. In the embodiment, the pipe body 11 is described as a type of pipe bent at 90 degrees, but the pipe body 11 is not limited to the type bent at 90 degrees. As other examples, the pipe body 11 may be a type bent at 10 degrees or a straight type pipe.

[0017] As shown in Figures 2 and 3, the straight pipe section 16 of the pipe body 11 is covered with a first sound-insulating cover 12. The first sound-insulating cover 12 is provided on the outer surface of the straight pipe section 16 by wrapping a sound-insulating sheet 12A around the straight pipe section 16. The ends of the wrapped sound-insulating sheet 12A are secured, for example, by attaching tape (not shown). Hereinafter, the ends of the sound-insulating sheet 12A may be referred to as "notches."

[0018] In the first embodiment, an example is described in which the cuts in the sound insulation sheet 12A are fastened with tape, but this is not limited to this. Other examples include adhesive, hook-and-loop fasteners, snap buttons, etc. In the following embodiments, the example of fastening with tape will be described as a representative example.

[0019] The first sound-insulating cover 12 is pre-wrapped around the outer surface of the straight pipe section 16 in a factory or the like before the sanitary bend 5 is installed at a new construction site, for example. By covering the straight pipe section 16 with the first sound-insulating cover 12, the sound insulation properties of the sanitary bend 5 can be ensured. The outer surface of the first sound-insulating cover 12 can also be finished with a shrink film (heat-shrinkable film) not shown. This ensures that the first sound-insulating cover 12 (i.e., the sanitary bend 5) looks good.

[0020] The sound insulation sheet 12A has a rectangular outer shape. The thickness of the sound insulation sheet 12A is preferably about 1 mm to 5 mm, and more preferably about 2 mm. The surface density of the sound insulation sheet 12A is 1 kg / m 2 ~8kg / m 2 It is preferable that the 2It is more preferable that the degree of

[0021] The sound-insulating sheet 12A is made of, for example, soft vinyl chloride, polyolefin, or the like. To enhance sound insulation, it is preferable to add barium sulfate, iron powder, or inorganic powder to the sound-insulating sheet 12A. Specifically, the sound-insulating sheet 12A is made of, for example, an elastic resin material such as an olefin-based material (a resin composition containing 300 to 300 parts by weight of inorganic filler per 100 parts by weight of olefin-based resin).

[0022] 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.

[0023] The olefin resin is not particularly limited, but examples thereof include low-density polyethylene (PE), high-density polyethylene, linear low-density polyethylene, atactic polypropylene, isotactic polypropylene, syndiotactic polypropylene, and poly-α-olefin. 3~0.93g / cm 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 first sound-insulating cover 12 is insufficient. 3 If the bending modulus of elasticity of the olefin resin is more than 100 kg / cm, there is a risk that the first sound insulating cover 12 will buckle when flattened. 2 ~3000kg / cm 2 If so, the strength and winding processability are sufficient. The sound-insulating sheet 12A may be formed from a material other than an olefin-based material, such as polyvinyl chloride resin, polystyrene resin, ABS resin, AS resin, or an elastomer material such as thermoplastic elastomer (TPE).

[0024] In the embodiment, an example in which the straight pipe portion 16 of the pipe main body 11 is covered only with the first sound-insulating cover 12 will be described, but it is preferable to use the first sound-insulating cover 12 in combination with a sound-absorbing material (not shown). The sound-absorbing material is provided between the outer surface of the straight pipe portion 16 and the first sound-insulating cover 12. The thickness of the sound-absorbing material (not shown) is preferably, for example, 3 mm or more. Furthermore, in consideration of workability, the thickness of the sound-absorbing material is preferably 50 mm or less. In this case, it is also possible to fasten the first sound-insulating cover 12 and the sound-absorbing material by wrapping a ring-shaped elastic material around the first sound-insulating cover 12. Examples of the ring-shaped elastic material include rubber tubing and tights. By combining the first sound-insulating cover 12 with a sound-absorbing material, it is possible to improve the sound insulation of the sanitary vent 5.

[0025] The sound-absorbing material (not shown) is made of, for example, glass wool, rock wool, felt, urethane sponge, etc. Specifically, the sound-absorbing material is made of, for example, needle felt. For example, needle felt contains 40% to 50% polyethylene terephthalate, 35% to 45% acrylic fiber, and 10% to 20% wool / rayon. When manufacturing needle felt, barbed needles are inserted into the needle felt to mechanically entangle the fibers. The sound absorbing material may be made of felt such as thermal felt or PET felt, or an acrylic fiber mixture. The density of the sound absorbing material is 80 kg / m 3 It is preferable that this is equal to or greater than this.

[0026] In the embodiment, an example is described in which the pipe body 11 of the sanitary bend 5 is made of VP and the straight pipe section 16 is covered with the first sound-insulating cover 12, but this is not limiting. As another example, for example, the pipe body 11 may be made of cast iron or rigid polyvinyl chloride, and the sanitary bend 5 may be a two-layer fire-resistant product.

[0027] (Second embodiment) A sanitary bend 20 according to a second embodiment will be described with reference to FIGS. 2 and 4, the sanitary bend 20 has a second sound insulating cover (sound insulating cover) 22 instead of the first sound insulating cover 12 of the first embodiment. The second sound insulating cover 22 is a cylindrical, integrally formed sound insulating cover that covers the straight pipe section 16. The second sound insulating cover 22 differs from the first sound insulating cover 12 of the first embodiment in that it is formed as a cylindrical, integrally formed sound insulating cover, but the other configurations are the same as those of the first sound insulating cover 12.

[0028] The second sound-insulating cover 22 is integrally molded into a tubular (cylindrical) shape by, for example, injection molding, extrusion molding, or the like. The cylindrically molded second sound-insulating cover 22 is fitted into the straight pipe section 16 and provided on the outer surface of the straight pipe section 16. The second sound-insulating cover 22 is provided in advance by pre-wrapping on the outer surface of the straight pipe section 16 in a factory or the like, for example, before the sanitary bend 5 is installed at a new construction site. By covering the straight pipe section 16 with the second sound-insulating cover 22, the sound insulation of the sanitary bend 20 can be ensured.

[0029] The thickness of the second sound-insulating cover 22 is, for example, the same as the thickness of the sound-insulating sheet 12A. The material of the second sound-insulating cover 22 is, for example, the same as the material of the sound-insulating sheet 12A. In the second embodiment, an example in which the straight pipe section 16 is covered only with the second sound-insulating cover 22 will be described, but it is preferable to use the second sound-insulating cover 22 in combination with a sound-absorbing material (not shown). The thickness and material of the sound-absorbing material (not shown) are the same as those of the sound-absorbing material in the first embodiment. Furthermore, the sanitary bend 20 may be a two-layer fire-resistant product, as in the first embodiment.

[0030] (Third embodiment) A sanitary bend 30 according to a third embodiment will be described with reference to FIGS. 5 and 6, the sanitary bend 30 includes a third sound-insulating cover (sound-insulating cover) 32 in addition to the first sound-insulating cover 12 or the second sound-insulating cover 22 of the first embodiment. Hereinafter, an example of the sanitary bend 30 including the third sound-insulating cover 32 in addition to the first sound-insulating cover 12 will be described.

[0031] The third sound-insulating cover 32 has a sound-insulating sheet 32A wrapped around the connection receiving portion 14 and the bend portion 15. Thus, the third sound-insulating cover 32 is provided on the outer surfaces of the connection receiving portion 14 and the bend portion 15. The third sound-insulating cover 32 is provided in advance by pre-wrapping the third sound-insulating cover 32 together with the first sound-insulating cover 12 on the outer surfaces of the connection receiving portion 14 and the bend portion 15 in a factory or the like, before the sanitary bend 30 is installed at a new construction site, for example. In other words, the straight pipe portion 16 of the sanitary bend 30 is covered with the first sound-insulating cover 12, and the connection receiving portion 14 and the bend portion 15 are covered with the third sound-insulating cover 32. This ensures sound insulation for the sanitary bend 30. The outer surfaces of the first sound-insulating cover 12 and the third sound-insulating cover 32 can also be finished with a shrink film (not shown). This ensures that the first sound-insulating cover 12 and the third sound-insulating cover 32 (i.e., the sanitary bend 30) look good.

[0032] The sound insulation sheet 32A has a generally rectangular outer shape. The sound insulation sheet 32A has a first notch 34 and a second notch 35 in both side portions 32Aa, 32Ab. The first notch 34 and the second notch 35 are V-shaped so that the width of the first notch 34 and the second notch 35 gradually increases from the center line 36 of the sound insulation sheet 32A toward the both side portions 32Aa, 32Ab. The center line 36 is a line that runs along the center between the both side portions 32Aa, 32Ab of the sound insulation sheet 32A. The sound insulation sheet 32A is wrapped around the connection receiving portion 14 and the bent portion 15 with the center line 36 of the sound insulation sheet 32A aligned with the position of the maximum radius of curvature of the bent portion 15. In this state, the both side portions 32Aa, 32Ab are positioned at the position of the minimum radius of curvature of the bent portion 15. Therefore, the connection receiving portion 14 and the bent portion 15 are covered with the third sound-insulating cover 32. The thickness of the sound-insulating sheet 32A is, for example, the same as the thickness of the sound-insulating sheet 12A. The material of the sound-insulating sheet 32A is, for example, the same as the material of the sound-insulating sheet 12A.

[0033] In the third embodiment, an example in which the connection receiving portion 14 and the bend portion 15 are covered only by the third sound-insulating cover 32 will be described. However, it is preferable to use the third sound-insulating cover 32 in combination with a sound-absorbing material (not shown). The thickness and material of the sound-absorbing material (not shown) are the same as those of the sound-absorbing material in the first embodiment. Furthermore, the sanitary bend 30 may be a two-layer fire-resistant product, as in the first embodiment.

[0034] (Fourth embodiment) A sanitary vent 40 according to a fourth embodiment will be described with reference to Figures 7 to 12. Although Figures 7 to 12 show a state in which the first sound-insulating cover 12 is omitted, in reality the first sound-insulating cover 12 is provided. As shown in FIG. 7, the sanitary bend 40 includes a fourth sound insulating cover (sound insulating cover) 42 instead of the third sound insulating cover 32 of the third embodiment. The fourth sound insulating cover 42 includes a first sound insulating part 44 and a second sound insulating part 45. The first sound insulating part 44 is wrapped around the bend portion 15. Therefore, the first sound insulating part 44 is provided on the outer surface of the bend portion 15. The second sound insulating part 45 is wrapped around the connection receiving portion 14 and a part 44a of the first sound insulating part 44. Therefore, the second sound insulating part 45 is provided on the outer surface of the connection receiving portion 14 and the outer surface of the part 44a of the first sound insulating part 44.

[0035] As shown in Figures 7 and 8, the first sound insulation part 44 has a first sound insulation sheet 44A wrapped around the bent portion 15. The first sound insulation sheet 44A has a cut not shown sealed by, for example, applying tape 55 to the cut. The first sound insulation sheet 44A has a substantially rectangular outer shape. The first sound insulation sheet 44A has first slits 46 extending toward both side portions 44Aa, 44Ab. The both side portions 44Aa, 44Ab are separated by the first slits 46. The first sound insulation sheet 44A has a pair of second slits 47 extending toward one end 44Ac. The one end 44Ac is separated by the pair of second slits 47.

[0036] 8 and 9, the first sound-insulating sheet 44A has one end 44Ac located on the opposite side of the straight pipe section 16, and a center line 48 aligned with the position of the maximum radius of curvature of the bent section 15. The center line 48 is a line that runs along the center between the side portions 44Aa, 44Ab of the first sound-insulating sheet 44A.

[0037] As shown in FIGS. 8 and 10, the first sound insulating sheet 44A is wrapped around the bent portion 15 with the center line 48 aligned with the position of the maximum radius of curvature of the bent portion 15.

[0038] 8 and 11, the first sound-insulating sheet 44A is wrapped around the bent portion 15. In this state, both side portions 44Aa, 44Ab of the first sound-insulating sheet 44A are positioned at the position of the smallest radius of curvature of the bent portion 15. As a result, the bent portion 15 is covered with the first sound-insulating sheet 44A.

[0039] As shown in FIGS. 7 and 12, the second sound insulation part 45 has a second sound insulation sheet 45A wrapped around the connection receiver 14 and a portion 44a of the first sound insulation part 44. The second sound insulation sheet 45A has cuts (not shown) sealed by, for example, applying tape 56 to the cuts. Thus, the second sound insulation part 45 is provided on the outer surface of the connection receiver 14 and the outer surface of the portion 44a of the first sound insulation part 44. The second sound insulation sheet 45A has a substantially hexagonal outer shape. The second sound insulation sheet 45A has a pair of third slits 51 extending toward one end 45Aa. The one end 45Aa is separated by the third slits 51. The second sound insulation sheet 45A has a pair of fourth slits 52 extending toward the other end 45Ab. The other end 45Ab is separated by the pair of fourth slits 52.

[0040] The second sound insulation sheet 45A has one end 45Aa disposed on the connection receiving portion 14 side, and a center line 53 aligned with the position of the maximum radius of curvature of the bent portion 15. The center line 53 is a line along the center between the side portions 45Ac, 45Ad of the second sound insulation sheet 45A. The second sound insulation sheet 45A is wrapped around the connection receiving portion 14 and the part 44a of the first sound insulation part 44 with the center line 53 aligned with the position of the maximum radius of curvature of the bent portion 15. The side portions 45Ac, 45Ad of the second sound insulation sheet 45A are disposed on the side of the bent portion 15 where the radius of curvature is smallest.

[0041] In this state, the connection receiving portion 14 and a portion 44a of the first sound insulating part 44 are covered with the second sound insulating sheet 45A. As a result, the first sound insulating part 44 and the second sound insulating part 45 (i.e., the fourth sound insulating cover 42) are provided on the outer surfaces of the connection receiving portion 14 and the bend portion 15. The thickness of the first sound insulating sheet 44A and the second sound insulating sheet 45A is, for example, the same as the thickness of the sound insulating sheet 12A. The material of the first sound insulating sheet 44A and the second sound insulating sheet 45A is, for example, the same as the material of the sound insulating sheet 12A.

[0042] 7, before the sanitary bend 40 is installed at a new construction site, for example, the fourth sound-insulating cover 42 is pre-wrapped around the outer surfaces of the connection receiving portion 14 and the bend portion 15 together with the first sound-insulating cover 12 in a factory or the like. That is, the straight pipe portion 16 of the sanitary bend 40 is covered with the first sound-insulating cover 12, and the connection receiving portion 14 and the bend portion 15 are covered with the fourth sound-insulating cover 42. This ensures sound insulation of the sanitary bend 40. The outer surfaces of the first sound insulating cover 12 and the fourth sound insulating cover 42 can also be finished with a shrink film (not shown). This ensures that the first sound insulating cover 12 and the fourth sound insulating cover 42 (i.e., the sanitary bend 40) look good.

[0043] In the fourth embodiment, an example in which the connection receiving portion 14 and the bend portion 15 are covered only by the fourth sound-insulating cover 42 will be described. However, it is preferable to use the fourth sound-insulating cover 42 in combination with a sound-absorbing material (not shown). The thickness and material of the sound-absorbing material (not shown) are the same as those of the sound-absorbing material in the first embodiment. Furthermore, the sanitary bend 40 may be a two-layer fire-resistant product, as in the first embodiment.

[0044] (Fifth embodiment) A sanitary bend 60 according to a fifth embodiment will be described with reference to FIGS. 13, the sanitary vent 60 includes a fifth sound insulating cover (sound insulating cover) 62 instead of the third sound insulating cover 32 of the third embodiment. The fifth sound insulating cover 62 includes a first sound insulating part 64 and a second sound insulating part 65.

[0045] The first sound-insulating part 64 is wrapped around the main portion 15c of the bend portion 15 and the main portion 14a of the connection receiving portion 14. Hereinafter, the main portion 15c of the bend portion 15 may be referred to as the "bend main portion 15c," and the main portion 14a of the connection receiving portion 14 may be referred to as the "connection receiving main portion 14a." Thus, the first sound-insulating part 64 is provided on the outer surface of the bend main portion 15c and the outer surface of the connection receiving main portion 14a.

[0046] The second sound insulation part 65 is wrapped around the minimum curvature radius portion 15d of the bend portion 15 and the minimum curvature radius portion side 14b of the connection receiving portion 14. Hereinafter, the minimum curvature radius portion 15d of the bend portion 15 may be referred to as the "minimum bend portion 15d," and the minimum curvature radius portion side 14b of the connection receiving portion 14 may be referred to as the "minimum connection receiving portion side 14b." Thus, the second sound insulation part 65 is provided on the outer surface of the minimum bend portion 15d and the outer surface of the minimum connection receiving portion side 14b.

[0047] As shown in Figures 13 to 17, the first sound insulation part 64 has a first sound insulation sheet 64A wrapped around the main portion 15c of the bent portion 15 and the main portion 14a of the connection receiving portion 14. The first sound insulation sheet 64A has a long sheet 66 and a pair of curved sheets 67. The long sheet 66 and the pair of curved sheets 67 are integrally formed. The long sheet 66 is formed long enough to be arranged along the maximum curvature radius portion of the bent portion 15 and the maximum curvature radius portion side of the connection receiving portion 14.

[0048] The pair of curved sheets 67 are formed in a curved shape. The pair of curved sheets 67 are connected at the center of the outer periphery 67a to both side portions of the long sheet 66. The pair of curved sheets 67 are arranged symmetrically with respect to the long sheet 66. The curved sheets 67 have first slits 71 extending toward the outer periphery 67a. The outer periphery 67a is separated by the first slits 71. The curved sheets 67 have second slits 72 extending toward the inner periphery 67b. The inner periphery 67b is separated by the second slits 72. The first sound-insulating sheet 64A has a pair of curved sheets 67 wrapped around the bend main portion 15c and the connection receiving main portion 14a, with the long sheet 66 positioned along the maximum curvature radius portion of the bend portion 15 and the maximum curvature radius portion side of the connection receiving portion 14.

[0049] The second sound-insulating part 65 has a second sound-insulating sheet 65A provided on the smallest bend portion 15d and the smallest connection receiving portion side 14b. The second sound-insulating sheet 65A is formed in a substantially rectangular shape. In this state, the smallest bend portion 15d and the smallest connection receiving portion side 14b are covered with the second sound insulating sheet 65A. As a result, the first sound insulating part 64 and the second sound insulating part 65 (i.e., the fifth sound insulating cover 62) are provided on the outer surfaces of the connection receiving portion 14 and the bent portion 15. The thickness of the first sound insulating sheet 64A and the second sound insulating sheet 65A is, for example, the same as the thickness of the sound insulating sheet 12A. The material of the first sound insulating sheet 64A and the second sound insulating sheet 65A is, for example, the same as the material of the sound insulating sheet 12A.

[0050] 13 , before the sanitary bend 60 is installed at a new construction site, for example, the fifth sound-insulating cover 62 is pre-wrapped around the outer surfaces of the connection receiving portion 14 and the bend portion 15 together with the first sound-insulating cover 12 in a factory or the like. That is, the straight pipe portion 16 of the sanitary bend 60 is covered with the first sound-insulating cover 12, and the connection receiving portion 14 and the bend portion 15 are covered with the fifth sound-insulating cover 62. This ensures sound insulation of the sanitary bend 60. The outer surfaces of the first sound insulating cover 12 and the fifth sound insulating cover 62 can also be finished with a shrink film (not shown). This ensures that the first sound insulating cover 12 and the fifth sound insulating cover 62 (i.e., the sanitary bend 60) look good.

[0051] In the fifth embodiment, an example in which the connection receiving portion 14 and the bend portion 15 are covered only by the fifth sound-insulating cover 62 will be described. However, it is preferable to use the fifth sound-insulating cover 62 in combination with a sound-absorbing material (not shown). The thickness and material of the sound-absorbing material (not shown) are the same as those of the sound-absorbing material in the first embodiment. Furthermore, the sanitary bend 60 may be a two-layer fire-resistant product, as in the first embodiment.

[0052] (Sixth embodiment) A sanitary bend 80 according to a sixth embodiment will be described with reference to FIGS. 13 and 18, the sanitary bend 80 has a sixth sound insulating cover (sound insulating cover) 82 instead of the fifth sound insulating cover 62. The sixth sound insulating cover 82 is obtained by dividing the long sheet 66 and the pair of curved sheets 67 provided in the first sound insulating sheet 64A of the fifth embodiment into three sheets. Other configurations of the sixth sound insulating cover 82 are the same as those of the sanitary bend 60 of the fifth embodiment.

[0053] (Seventh embodiment) A sanitary bend 90 according to a seventh embodiment will be described with reference to FIGS. 19, a sanitary bend 90 includes a seventh sound insulating cover (sound insulating cover) 92 instead of the third sound insulating cover 32. The seventh sound insulating cover 92 is integrally molded into a tubular (cylindrical) shape by, for example, injection molding, extrusion molding, or the like.

[0054] 20 to 22, the seventh sound insulating cover 92, which is integrally molded into a cylindrical shape, is fitted into the connection receiving portion 14 and the bend portion 15, and is thereby provided on the outer surfaces of the connection receiving portion 14 and the bend portion 15. The seventh sound insulating cover 92 has a cut 92a (see FIG. 20) secured to the first sound insulating cover 12, for example, by adhering tape 95 to the cut 92a. The seventh sound insulating cover 92 also has a protruding portion 92b (see also FIG. 20) secured to the connection receiving portion 14, for example, by adhering tape 96 to the protruding portion 92b. The thickness of the seventh sound insulating cover 92 is, for example, the same as the thickness of the sound insulating sheet 12A. The material of the seventh sound insulating cover 92 is, for example, the same as the material of the sound insulating sheet 12A.

[0055] 19 to 22 , before the sanitary bend 90 is installed at a new construction site, for example, the seventh sound-insulating cover 92 is pre-wrapped around the outer surfaces of the connection receiving portion 14 and the bend portion 15 together with the first sound-insulating cover 12 in a factory or the like. That is, the straight pipe portion 16 of the sanitary bend 90 is covered with the first sound-insulating cover 12, and the connection receiving portion 14 and the bend portion 15 are covered with the seventh sound-insulating cover 92. This ensures sound insulation of the sanitary bend 90. The outer surfaces of the first sound insulating cover 12 and the seventh sound insulating cover 92 can also be finished with a shrink film (not shown). This ensures that the first sound insulating cover 12 and the seventh sound insulating cover 92 (i.e., the sanitary bend 90) look good.

[0056] In the seventh embodiment, an example in which the connection receiving portion 14 and the bend portion 15 are covered only by the seventh sound-insulating cover 92 will be described. However, it is preferable to use the seventh sound-insulating cover 92 in combination with a sound-absorbing material (not shown). The thickness and material of the sound-absorbing material (not shown) are the same as those of the sound-absorbing material in the first embodiment. Furthermore, the sanitary bend 90 may be a two-layer fire-resistant product, as in the first embodiment.

[0057] (Eighth embodiment) A sanitary bend 100 according to an eighth embodiment will be described with reference to FIG. As shown in Fig. 23, the sanitary bend 100 is obtained by replacing the seventh sound insulating cover 92 of the seventh embodiment with an eighth sound insulating cover (sound insulating cover) 102. Other configurations of the sanitary bend 100 are similar to those of the sanitary bend 90 of the seventh embodiment.

[0058] The eighth sound insulating cover 102 includes a first bend portion cover 104, a second bend portion cover 105, and a connection receiving cover 106. The first bend portion cover 104, the second bend portion cover 105, and the connection receiving cover 106 are integrally molded into a tubular (cylindrical) shape by, for example, injection molding, extrusion molding, or the like. The first bend section cover 104 is fitted into the half 15e of the bend section 15 that faces the straight pipe section 16. Therefore, the first bend section cover 104 is provided on the outer surface of the half 15e that faces the straight pipe section 16. Hereinafter, the half 15e of the bend section 15 that faces the straight pipe section 16 may be referred to as the "first half 15e."

[0059] The second bend portion cover 105 is fitted into the half 15f of the bend portion 15 that faces the connection receiving portion 14. Therefore, the second bend portion cover 105 is provided on the outer surface of the half 15f that faces the connection receiving portion 14. Hereinafter, the half 15f of the bend portion 15 that faces the connection receiving portion 14 may be referred to as the "second half 15f." The connection receiving cover 106 is fitted into the connection receiving portion 14. Therefore, the connection receiving cover 106 is provided on the outer surface of the connection receiving portion 14.

[0060] The first bend portion cover 104, the second bend portion cover 105, and the connection receiving cover 106 (i.e., the eighth sound insulating cover 102) are pre-wrapped together with the first sound insulating cover 12 onto the outer surfaces of the connection receiving portion 14 and the bend portion 15 at a factory or the like. That is, the straight pipe portion 16 of the sanitary bend 100 is covered with the first sound insulating cover 12, and the connection receiving portion 14 and the bend portion 15 are covered with the eighth sound insulating cover 102. This ensures sound insulation of the sanitary bend 100. The outer surfaces of the first sound insulating cover 12 and the eighth sound insulating cover 102 can also be finished with a shrink film (not shown). This ensures that the first sound insulating cover 12 and the eighth sound insulating cover 102 (i.e., the sanitary bend 100) look good.

[0061] In the eighth embodiment, an example will be described in which the connection receiving portion 14 and the bend portion 15 are covered only by the eighth sound-insulating cover 102. However, it is preferable to use the eighth sound-insulating cover 102 in combination with a sound-absorbing material (not shown). The thickness and material of the sound-absorbing material (not shown) are the same as those of the sound-absorbing material in the first embodiment. Furthermore, the sanitary bend 100 may be a two-layer fire-resistant product, as in the first embodiment.

[0062] Next, examples of installing a sound-insulating cover by post-rolling at a renovation site will be described in the ninth to thirteenth embodiments shown in Figures 24 to 29. Here, "post-rolling" includes, for example, wrapping a sound-insulating sheet, fitting a cylindrical sound-insulating cover, or attaching a half sound-insulating cover during construction. In the ninth to thirteenth embodiments, components that are the same as or similar to those in the first embodiment are denoted by the same reference numerals, and detailed explanations thereof will be omitted.

[0063] (Ninth embodiment) A sanitary bend 110 according to a ninth embodiment will be described with reference to FIGS. 24, the straight pipe portion 16 of the pipe main body 11 is covered with a ninth sound insulating cover (sound insulating cover) 112. The ninth sound insulating cover 112 is formed by wrapping a sound insulating sheet 112A around the straight pipe portion 16 at a repair site, for example. Thus, the ninth sound insulating cover 112 is provided on the outer surface of the straight pipe portion 16.

[0064] As shown in Figures 24 and 25, a slit (not shown) in the sound-insulating sheet 112A wrapped around the straight pipe section 16 is located on the opposite side of the rear wall 204 (the side indicated by arrow B) from the boundary line 116. The slit (not shown) can be closed, for example, by applying tape 114. Therefore, the straight pipe section 16 of the sanitary bend 110 is covered with the ninth sound-insulating cover 112. This ensures the sound insulation of the sanitary bend 110. The boundary line 116 is a line that passes through the center of the straight pipe section 16 and extends in the vertical direction. Therefore, by positioning the slit (not shown) on the opposite side of the rear wall 204, the slit can be placed in a relatively large space and in a position that is easy to see. This makes it difficult to ensure the appearance of the sanitary bend 110. On the other hand, it is easier to apply tape 114 to the slit, improving the ease of installation of the sanitary bend 110.

[0065] In the ninth embodiment, the sound insulating sheet 112A has been described as an example of the ninth sound insulating cover 112, but this is not limiting. As another example, the ninth sound insulating cover 112 may be a half-molded product instead of the sound insulating sheet 112A. In this case, the half-molded part is located on the opposite side (the side of arrow B) from the rear wall 204. The half-molded part is secured by, for example, adhering tape 114.

[0066] The outer surface of the ninth sound insulating cover 112 can also be finished with a shrink film (not shown), thereby ensuring an appropriate appearance of the ninth sound insulating cover 112 (i.e., the sanitary vent 110). In the ninth embodiment, an example will be described in which the straight pipe portion 16 is covered only with the ninth sound-insulating cover 112, but it is preferable to use the ninth sound-insulating cover 112 in combination with a sound-absorbing material (not shown). The thickness and material of the sound-absorbing material (not shown) are the same as those of the sound-absorbing material in the first embodiment. In the ninth embodiment, an example in which the straight pipe portion 16 is covered with the ninth sound-insulating cover 112 has been described, but this is not limiting. As another example, in addition to the straight pipe portion 16, the bent portion 15 and the connection receiving portion 14 may also be covered with the sound-insulating cover 112.

[0067] (Tenth embodiment) A sanitary bend 120 according to a tenth embodiment will be described with reference to FIGS. 26, in the sanitary bend 120, for example, at a repair site, a sound insulating sheet 122A of a tenth sound insulating cover (sound insulating cover) 122 is wound around the straight pipe section 16 by post-winding. Thus, the tenth sound insulating cover 122 is provided on the outer surface of the straight pipe section 16. The sound insulating sheet 122A is the same as the sound insulating sheet 112A of the ninth embodiment.

[0068] 25 and 26, a slit (not shown) in the sound-insulating sheet 122A wrapped around the straight pipe section 16 is located on the rear wall 204 side (the side indicated by arrow C) of the boundary line 116. The slit (not shown) is closed by, for example, adhering tape 114. Therefore, the straight pipe section 16 of the sanitary bend 120 is covered with the tenth sound-insulating cover 122. This ensures the sound insulation of the sanitary bend 120.

[0069] Here, by positioning the slit (not shown) on the rear wall 204 side, the slit is placed in a relatively narrow space and in a position that is difficult to see. This makes it difficult to apply tape 114 to the slit. On the other hand, tape 114 can be applied in a position that is difficult to see, thereby ensuring the appropriate appearance of the sanitary bend 120.

[0070] In the tenth embodiment, the tenth sound insulating cover 122 is described using the sound insulating sheet 122A as an example, but this is not limiting. As another example, the tenth sound insulating cover 122 may be a half-molded product instead of the sound insulating sheet 122A. In this case, the half-molded part is located on the rear wall 204 side (the side indicated by arrow C). The half-molded part is secured by, for example, adhering tape 114.

[0071] The outer surface of the tenth sound insulating cover 122 can also be finished with a shrink film (not shown), thereby ensuring an appropriate appearance of the tenth sound insulating cover 122 (i.e., the sanitary bend 120). In the tenth embodiment, an example will be described in which the straight pipe section 16 is covered only with the tenth sound-insulating cover 122, but it is preferable to use the tenth sound-insulating cover 122 in combination with a sound-absorbing material (not shown). The thickness and material of the sound-absorbing material (not shown) are the same as those of the sound-absorbing material in the first embodiment. In the tenth embodiment, an example in which the straight pipe portion 16 is covered with the ninth sound-insulating cover 122 has been described, but this is not limiting. As another example, in addition to the straight pipe portion 16, the bent portion 15 and the connection receiving portion 14 may also be covered with the sound-insulating cover 122.

[0072] (Eleventh embodiment) A sanitary bend 130 according to an eleventh embodiment will be described with reference to FIG. As shown in Figure 27, a sanitary bend 130 has an eleventh sound-insulating cover (sound-insulating cover) 132 wound around the outer surface of the pipe body 11 (i.e., the connection receiving portion 14, the bend portion 15, and the straight pipe portion 16) at a repair site, for example. The eleventh sound-insulating cover 132 is integrally molded into a tubular (cylindrical) shape by, for example, injection molding or using gypsum fiber, and is separated along the longitudinal direction at a split surface 133. By being separated at the split surface 133, the eleventh sound-insulating cover 132 has a first half-molded product 134 and a second half-molded product 135.

[0073] The first half-molded product 134 is provided on the rear wall 204 side (see FIG. 25) of the pipe body 11. The second half-molded product 135 is provided on the opposite side of the rear wall 204 of the pipe body 11. In this state, the split surface 133 is located on the upper side of the pipe body 11. The split surface 133 is fixed, for example, by adhering it with tape (not shown). Therefore, in the sanitary bend 130, the pipe body 11 is covered with the eleventh sound-insulating cover 132. This ensures the sound insulation of the sanitary bend 130.

[0074] In the eleventh embodiment, an example will be described in which the split surface 133 is disposed on the upper side of the pipe body 11, but the split surface 133 may also be disposed on the lower side of the pipe body 11. In the eleventh embodiment, an example will be described in which the eleventh sound insulating cover 132 is separated at the separation surface 133 to form the first half molded product 134 and the second half molded product 135, but this is not limiting. As another example, the first half molded product 134 and the second half molded product 135 may be formed or molded separately in advance.

[0075] (Twelfth embodiment) A sanitary bend 140 according to a twelfth embodiment will be described with reference to FIG. As shown in Figure 28, the sanitary bend 140 is obtained by replacing the eleventh sound insulating cover 132 of the eleventh embodiment with a twelfth sound insulating cover (sound insulating cover) 142. The twelfth sound insulating cover 142 has a dividing line disposed on the rear wall 204 side of the pipe body 11. Specifically, the twelfth sound insulating cover 142 is integrally molded into a tubular (cylindrical) shape by, for example, injection molding or using gypsum fiber, and the rear wall 204 side is separated along the longitudinal direction at a dividing surface 143. By being separated at the dividing surface 143, the twelfth sound insulating cover 142 has a first half molded product 144 and a second half molded product 145.

[0076] The first half-molded product 144 is provided on the upper side of the pipe body 11. The second half-molded product 145 is provided on the lower side of the pipe body 11. In this state, the split surface 143 is located on the rear wall 204 side of the pipe body 11. The split surface 143 is fixed, for example, by adhering it with tape (not shown). Therefore, in the sanitary bend 140, the pipe body 11 is covered with the twelfth sound-insulating cover 142. This ensures the sound insulation of the sanitary bend 140.

[0077] Here, the cut surface 143 is positioned on the rear wall 204 side. Therefore, the cut surface 143 is arranged in a relatively narrow space and in a position that is difficult to see. This makes it difficult to apply tape (not shown) to the cut surface 143. On the other hand, tape (not shown) can be applied in a position that is difficult to see, thereby ensuring an appropriate appearance of the sanitary bend 140.

[0078] In the twelfth embodiment, an example will be described in which the twelfth sound insulating cover 142 is separated at the separation surface 143 to form a first half molded product 144 and a second half molded product 145, but the present invention is not limited to this. As another example, the first half molded product 144 and the second half molded product 145 may be formed or molded separately in advance.

[0079] (Thirteenth embodiment) A sanitary bend 150 according to a thirteenth embodiment will be described with reference to FIG. As shown in Figure 29, a sanitary bend 150 is obtained by replacing the twelfth sound insulating cover 142 of the twelfth embodiment with a thirteenth sound insulating cover (sound insulating cover) 152. The thirteenth sound insulating cover 152 has a dividing line disposed on the side of the pipe body 11 opposite the rear wall 204. Specifically, the thirteenth sound insulating cover 152 is integrally molded into a tubular (cylindrical) shape by, for example, injection molding or using gypsum fiber, and the side opposite the rear wall 204 is separated along the longitudinal direction at a dividing surface 153. By being separated at the dividing surface 153, the thirteenth sound insulating cover 152 has a first half molded product 154 and a second half molded product 155.

[0080] The first half-molded product 154 is provided on the upper side of the pipe body 11. The second half-molded product 155 is provided on the lower side of the pipe body 11. In this state, the split surface 153 is located on the rear wall 204 side of the pipe body 11. The split surface 153 is fixed, for example, by adhering it with tape (not shown). Therefore, in the sanitary bend 150, the pipe body 11 is covered with the thirteenth sound-insulating cover 152. This ensures the sound insulation of the sanitary bend 150.

[0081] Here, the split surface 153 is positioned on the opposite side of the rear wall 204 of the pipe body 11. This allows the split surface 153 to be positioned in a relatively large space and in an easily visible location. This makes it difficult to ensure the appearance of the sanitary bend 140. On the other hand, it is easy to apply tape (not shown) to the split surface 153, improving the ease of installation of the sanitary bend 150.

[0082] In the thirteenth embodiment, an example will be described in which the thirteenth sound insulating cover 152 is separated at the separation surface 153 to form a first half molded product 154 and a second half molded product 155, but the present invention is not limited to this. As another example, the first half molded product 154 and the second half molded product 155 may be formed or molded separately in advance.

[0083] (Construction method) Next, a construction method for the piping structure 1 will be described. First, a construction method will be described in which a sanitary bend on which a sound insulating cover has been pre-wrapped in a factory or the like is constructed at a new construction site. In the first to eighth embodiments of the sanitary bend, the first sound-insulating cover 12 to the eighth sound-insulating cover 102 are pre-wrapped around the outer surface of the straight pipe section 16, the outer surface of the bend section 15, the outer surface of the connection receiving section 14, etc. in a factory or the like. The sanitary bend 5 of the first embodiment will be described below as a representative example. In the sanitary bend 5, the first sound-insulating cover 12 is attached to the straight pipe section 16.

[0084] As shown in Figure 1, when installing the sanitary bend 5 at a new construction site, the first sound-insulating cover 12 is cut to fit the distance between the collecting joint 7 of the collecting pipe 2 and the drain outlet 3a of the toilet 3. Specifically, the first sound-insulating cover 12 is cut to fit a dimension that takes into account the length of insertion of the pipe body 11 into the collecting joint 7. If the first sound-insulating cover 12 is made of a sheet material, it can be cut with scissors, for example.

[0085] Next, the unnecessary portion of the straight pipe section 16 of the pipe body 11 is cut off. The unnecessary portion can be cut off using, for example, a band saw, a handsaw, etc. After the unnecessary portion of the straight pipe section 16 is cut off, the sanitary bend 5 is passed through the through hole 206 in the wall 205 of the PS201 and connected to the manifold joint 7. Thereafter, a gypsum board (not shown) with a notch for passing the sanitary bend 5 is attached to the wall 205, and a sealing plate is attached to the gap between the gypsum board and the sanitary bend 5 to complete the work.

[0086] Next, the sanitary bend 5 is connected to the drain outlet 3a of the toilet 3. At this time, if it becomes necessary to adjust the length of the sanitary bend 5, it is also possible to adjust the length of the sanitary bend 5 by pulling out the sanitary bend 5. This completes the installation method for installing the sanitary bend 5 of the piping structure 1 at a new construction site. In this way, when the sanitary bend 5 is installed at a new construction site, the first sound insulating cover 12 can be installed without any problems even inside the wall 205 of the PS201.

[0087] Next, a construction method (renovation method) for installing a sound-insulating cover by post-rolling it at the renovation site will be described. In the ninth to thirteenth embodiments of the sanitary bend, the ninth to thirteenth sound-insulating covers 112 to 152 are installed at a repair site or the like by wrapping them around the outer surface of the straight pipe section 16, the outer surface of the bend section 15, the outer surface of the connection receiving section 14, etc. Below, the sanitary bend 110 of the ninth embodiment will be described as a representative example. In the sanitary bend 110, the ninth sound-insulating cover 112 is installed on the straight pipe section 16.

[0088] As shown in Figures 1 and 24, when constructing a sanitary bend 110 at a renovation site, the connection receiving portion 14 of the pipe body 11 is connected to the drain outlet portion 3a of the toilet 3. In addition, the straight pipe portion 16 of the pipe body 11 is inserted (connected) into the collecting joint 7 of the collecting pipe 2 while passing through a through hole 206 in a wall 205 of the PS 201. In this state, the sound-insulating sheet 112A of the ninth sound-insulating cover 112 is wrapped around the portion of the pipe body 11 that is exposed on the toilet 202 side. This completes the construction method for constructing the sanitary bend 110 of the piping structure 1 at the renovation site.

[0089] According to the piping structure 1 according to the embodiment described above, in the sanitary bends of the first to thirteenth embodiments, at least the straight pipe section 16 is covered with the sound-insulating cover 12, 22, 112, 122, 132, 142, 152, etc. This allows the sound-insulating cover to reduce the drainage noise generated from the sanitary bends of the first to thirteenth embodiments.

[0090] Furthermore, according to the sanitary bends of the first to eighth embodiments described above, the first to eighth sound insulating covers 12 to 102 are pre-wrapped around the outer surface of the straight pipe section 16, the outer surface of the bend section 15, the outer surface of the connection receiving section 14, and the like. Therefore, the first to eighth sound insulating covers 12 to 102 can be provided on the sanitary bends of the first to eighth embodiments before they are assembled into the piping structure 1. That is, for example, at a new construction site, a sanitary bend provided with the first to eighth sound insulating covers 12 to 102 can be constructed. As a result, the drainage noise generated from the sanitary bends of the first to eighth embodiments can be reduced by the first to eighth sound insulating covers 12 to 102.

[0091] Also, by previously providing the first sound insulating cover 12 to the eighth sound insulating cover 102 on the outer surface of the straight pipe section 16, it is possible to easily construct a sanitary bend equipped with the first sound insulating cover 12 to the eighth sound insulating cover 102. Furthermore, the appearance of the first sound insulating cover 12 to the eighth sound insulating cover 102 can be made neat.

[0092] Furthermore, according to the sanitary bends of the ninth to thirteenth embodiments, the ninth to thirteenth sound-insulating covers 112 to 152 are attached by post-wrapping onto the outer surface of the straight pipe section 16, the outer surface of the bend section 15, the outer surface of the connection receiving section 14, etc. Therefore, for example, if a problem such as drainage noise is discovered at a repair site after completion, the ninth to thirteenth sound-insulating covers 112 to 152 can be neatly attached by simple post-wrapping onto the outer surface of the straight pipe section 16, the outer surface of the bend section 15, the outer surface of the connection receiving section 14, etc. As a result, the ninth to thirteenth sound-insulating covers 112 to 152 can reduce the drainage noise generated from the sanitary bends of the ninth to thirteenth embodiments.

[0093] Furthermore, according to the construction method for constructing the piping structure according to the embodiment described above, in the sanitary bends of the first to thirteenth embodiments, at least the straight pipe section 16 is covered with the sound-insulating cover 12, 22, 112, 122, 132, 142, 152, etc. This allows the sound-insulating cover to reduce the drainage noise generated from the sanitary bends of the first to thirteenth embodiments.

[0094] Furthermore, according to the sanitary bends of the first to eighth embodiments, the first to eighth sound insulating covers 12 to 102 are pre-wrapped around the outer surface of the straight pipe section 16, the outer surface of the bend section 15, the outer surface of the connection receiving section 14, and the like. Thus, the first to eighth sound insulating covers 12 to 102 can be provided on the sanitary bends of the first to eighth embodiments before they are assembled into the piping structure 1. That is, for example, at a new construction site, a sanitary bend provided with the first to eighth sound insulating covers 12 to 102 can be constructed. As a result, the drainage noise generated from the sanitary bends of the first to eighth embodiments can be reduced by the first to eighth sound insulating covers 12 to 102.

[0095] Also, by previously providing the first sound insulating cover 12 to the eighth sound insulating cover 102 on the outer surface of the straight pipe section 16, it is possible to easily construct a sanitary bend equipped with the first sound insulating cover 12 to the eighth sound insulating cover 102. Furthermore, the appearance of the first sound insulating cover 12 to the eighth sound insulating cover 102 can be made neat.

[0096] Furthermore, according to the sanitary bends of the ninth to thirteenth embodiments, the ninth to thirteenth sound-insulating covers 112 to 152 are attached by post-wrapping onto the outer surface of the straight pipe section 16, the outer surface of the bend section 15, the outer surface of the connection receiving section 14, etc. Therefore, for example, if a problem such as drainage noise is discovered at a repair site after completion, the ninth to thirteenth sound-insulating covers 112 to 152 can be neatly attached by simple post-wrapping onto the outer surface of the straight pipe section 16, the outer surface of the bend section 15, the outer surface of the connection receiving section 14, etc. As a result, the ninth to thirteenth sound-insulating covers 112 to 152 can reduce the drainage noise generated from the sanitary bends of the ninth to thirteenth embodiments.

[0097] 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.

[0098] For example, the sound absorbing material may be omitted.

[0099] In addition, the components in this embodiment can be replaced with well-known components as appropriate, without departing from the spirit of the present invention.

[0100] (Addendum) The embodiment can be understood, for example, as follows.

[0101] <1> A piping structure according to one aspect of the present invention is a piping structure having a sanitary bend provided between a toilet and a collecting pipe, the sanitary bend having a bend section, a straight pipe section, and a sound-insulating cover that covers at least the straight pipe section.

[0102] According to the piping structure, at least the straight pipe portion of the sanitary bend is covered with a sound-insulating cover, which can reduce the drainage noise generated from the sanitary bend.

[0103] <2> A sanitary bend according to one aspect of the present invention comprises: <1> The sanitary bend is used for the above-mentioned purpose, and the sound-insulating cover is provided in advance on the outer surface of the straight pipe portion.

[0104] According to the sanitary bend, a sound-insulating cover is attached to the outer surface of the straight pipe section in advance. Therefore, the sound-insulating cover can be attached to the sanitary bend before it is installed in the piping structure. That is, for example, a sanitary bend with a sound-insulating cover can be installed at a new construction site. This allows the sound-insulating cover to reduce the drainage noise generated from the sanitary bend. Furthermore, by providing a sound insulating cover on the outer surface of the straight pipe section in advance, a sanitary bend equipped with a sound insulating cover can be easily constructed.Furthermore, the appearance of the sound insulating cover can be made neat.

[0105] <3> In a sanitary bend according to one aspect of the present invention, <1> The sound-insulating cover is attached to the outer surface of the straight pipe section by wrapping around it.

[0106] With the sanitary bend, a sound-insulating cover is attached to the outer surface of the straight pipe section by wrapping it around the pipe. Therefore, if a problem such as drainage noise is discovered at a repair site after completion, a sound-insulating cover can be neatly attached to the outer surface of the straight pipe section by simply wrapping it around the pipe. This allows the sound-insulating cover to reduce the drainage noise generated from the sanitary bend.

[0107] <4> A construction method according to one aspect of the present invention includes: <1> The piping structure will be constructed.

[0108] According to the construction method, a sound-insulating cover is provided on at least the straight pipe portion of the sanitary bend, thereby reducing the drainage noise generated from the sanitary bend.

[0109] <5> the above <4> In the installation method according to the above, the sound-insulating cover may be provided in advance by pre-winding.

[0110] According to the installation method, the sound-insulating cover is pre-wrapped around the outer surface of the straight pipe section. This allows the sound-insulating cover to be installed on the sanitary bend before it is installed in the piping structure. That is, for example, a sanitary bend with a sound-insulating cover can be installed at a new construction site. This allows the sound-insulating cover to reduce the drainage noise generated from the sanitary bend. Furthermore, by providing a sound insulating cover on the outer surface of the straight pipe section in advance, a sanitary bend equipped with a sound insulating cover can be easily constructed.Furthermore, the appearance of the sound insulating cover can be made neat.

[0111] <6> the above <4> In the installation method according to the above, the sound-insulating cover may be attached by post-wrapping.

[0112] According to the construction method, the sound-insulating cover is attached to the outer surface of the straight pipe section by wrapping it around the pipe. Therefore, for example, if a problem such as drainage noise is discovered at a repair site after completion, the sound-insulating cover can be neatly attached to the outer surface of the straight pipe section by simply wrapping it around the pipe. This allows the sound-insulating cover to reduce the drainage noise generated from the sanitary bend. [Explanation of symbols]

[0113] 1…Piping structure 2…Collecting pipe 3...Toilet 5, 20~40, 60, 80, 90~150...Sanitary bend 12...First sound insulation cover (sound insulation cover) 15...Bend section 16...Straight pipe section 22...Second sound insulation cover (sound insulation cover) 32...Third sound insulation cover (sound insulation cover) 42...Fourth sound insulation cover (sound insulation cover) 62...5th sound insulation cover (sound insulation cover) 82...6th sound insulation cover (sound insulation cover) 92...7th sound insulation cover (sound insulation cover) 102...8th sound insulation cover (sound insulation cover) 112...9th soundproof cover (soundproof cover) 122...10th sound insulation cover (sound insulation cover) 132...11th sound insulation cover (sound insulation cover) 142...12th sound insulation cover (sound insulation cover) 152...13th sound insulation cover (sound insulation cover)

Claims

1. A piping structure having a sanitary bend provided between a toilet and a collecting pipe, The sanitary bend is A piping structure having a bent portion, a straight pipe portion, and a sound-insulating cover that covers at least the straight pipe portion.

2. A sanitary bend for use in claim 1, The sound-insulating cover is a sanitary bend that is pre-installed on the outer surface of the straight pipe section.

3. A sanitary bend for use in claim 1, The sound-insulating cover is attached to the outer surface of the straight pipe section by wrapping around it, forming a sanitary bend.

4. A method for constructing the piping structure of claim 1.

5. The sound-insulating cover is provided in advance by pre-winding. The construction method according to claim 4.

6. The sound-insulating cover is provided by post-winding. The construction method according to claim 4.

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