Leg joint, sound insulation material, method for manufacturing leg joint, and piping structure

Abstract

The present invention provides a pipe jointing jig and pipe jointing method that can improve the sound insulation performance of leg joints equipped with cleaning ports. [Solution] The leg joint 5 comprises a cleaning port 15, a bent portion 13, and a sound insulation material 30. The cleaning port 15 is provided in the bent portion 13. The sound insulation material 30 comprises a first portion 31 that covers the bent portion 13 and a second portion 51 that covers the cleaning port 15.

Description

[Technical Field]

[0001] This invention relates to a leg joint, a sound insulation material, a method for manufacturing a leg joint, and a piping structure. [Background technology]

[0002] Traditionally, as buildings have become more multi-purpose and complex, there has been an increasing demand for improved sound insulation performance in piping systems, including drainage pipes. For example, to improve the sound insulation performance of drain pipes, it is effective to provide sufficient sound insulation to the bends in the drain pipes (e.g., leg joints), such as the legs of vertical pipes, where noise is generated. Therefore, a technique has been disclosed in which a sound-insulating cover is constructed by wrapping sound-insulating material around the outer surface of the joint to improve the sound-insulating performance of the joint (see, for example, Patent Document 1). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Patent No. 7502059 [Overview of the project] [Problems that the invention aims to solve]

[0004] However, some leg joints have cleaning ports. Therefore, there is room for improvement in enhancing the sound insulation performance of leg joints equipped with cleaning ports.

[0005] The present invention has been made in view of the circumstances described above, and aims to provide a leg joint, a sound insulation material, a method for manufacturing a leg joint, and a piping structure that can improve the sound insulation performance of a leg joint provided with a cleaning port. [Means for solving the problem]

[0006] A leg joint according to one aspect of the present invention is a leg joint comprising a cleaning port, a bent portion, and a sound-insulating material, wherein the cleaning port is provided in the bent portion, and the sound-insulating material comprises a first portion that covers the bent portion and a second portion that covers the cleaning port. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a leg joint, a sound insulation material, a method for manufacturing a leg joint, and a piping structure that can improve the sound insulation performance of a leg joint provided with a cleaning port. [Brief explanation of the drawing]

[0008] [Figure 1] This is a cross-sectional view of a building in which the piping structure of the first embodiment of the present invention is used. [Figure 2] This is a side view showing the leg joints of a piping structure. [Figure 3] This is a side view showing the joints of the leg structure. [Figure 4] This is a plan view of the sound-absorbing material of the sound insulation component. [Figure 5] This is a perspective view of the first and second parts of the sound-insulating material of the sound-insulating member. [Figure 6] This is an unfolded diagram showing the first part of the sound insulation material. [Figure 7] This is a perspective view of the second portion of the sound insulation material, seen from the surface side. [Figure 8] This is a perspective view of the second portion of the sound insulation material, seen from the back side. [Figure 9] This is an unfolded diagram showing the third part of the sound insulation material. [Figure 10] This is an exploded view showing the first part of the sound insulation material in a second embodiment of the present invention. [Figure 11] This is an exploded view showing the first and second parts of the sound insulation material in the third embodiment of the present invention. [Figure 12] This is a perspective view showing the first and second parts of the sound insulation material. [Figure 13] This is an exploded view showing the first and second parts of the sound insulation material in the fourth embodiment of the present invention. [Figure 14] Perspective view showing the first and second parts of the sound insulation material. [Figure 15] Side view showing the joint in the fifth embodiment of the present invention. [Figure 16] Plan view showing the sound absorption material of the sound insulation member unfolded. [Figure 17] Development view showing the first part of the sound insulation material. [Figure 18] Perspective view showing the first and second parts of the sound insulation material. [Figure 19] Development view showing the first part of the sound insulation material in the sixth embodiment of the present invention. [Figure 20] Development view showing the first and second parts of the sound insulation material in the seventh embodiment of the present invention. [Figure 21] Perspective view showing the first and second parts of the sound insulation material. [Figure 22] Side view showing the joint in the eighth embodiment of the present invention. [Figure 23] Plan view showing the sound absorption material of the sound insulation member unfolded. [Figure 24] Development view showing the first part of the sound insulation material. [Figure 25] Development view showing the first and second parts of the sound insulation material in the ninth embodiment of the present invention. [Figure 26] Development view showing the first part of the sound insulation material in the tenth embodiment of the present invention. [Figure 27] Development view showing the sound absorption material in the eleventh embodiment of the present invention. [Figure 28] Development view showing the first part of the sound insulation material. [Figure 29] Development view showing the sound absorption material in the twelfth embodiment of the present invention. [Figure 30] Development view showing the first part of the sound insulation material.

Mode for Carrying Out the Invention

[0009] The following describes a leg joint, sound insulation material, method for manufacturing the leg joint, and piping structure according to one embodiment of the present invention, with reference to the drawings.

[0010] (First Embodiment) The first embodiment will be described with reference to Figures 1 to 9. As shown in Figure 1, the piping structure 1 is used, for example, in a manifold joint system 110 within a building 100. In Figure 1, the manifold sound insulation member 119 and adhesive tape 120, which will be described later, are shown transparently and with hatching. The side piece 35A and adhesive tape 45, which will be described later, are shown by dashed lines. The manifold joint system 110 is used for drainage of the building 100. The manifold joint system 110 is installed on each floor of the building 100 through slab penetration holes 101a formed in the floor slab 101 of the building 100. The manifold joint system 110 comprises a piping structure 1, a vertical pipe 112, and a horizontal pipe 113.

[0011] The piping structure 1 comprises a manifold joint (connector) 111 and a leg joint 5. The manifold joint 111 is installed on the lowest floor of the building 100, and the leg joint 5 is connected to its lower side. The manifold joint 111 comprises a joint body 116 and a horizontal pipe connection part 117 fixed to the joint body 116. The joint body 116 is formed in a cylindrical shape, and the axis of the joint body 116 is arranged to align with the vertical direction. Here, "aligning with the axis and the vertical direction" means that the acute angle between the axis and the vertical direction is 30 degrees or less, or that the axis and the vertical direction are parallel. It is more preferable that this acute angle is 20 degrees or less. If the axis and the vertical direction do not intersect, the axis, etc., is extended tangently to determine the acute angle. The same applies to the alignment of the outer edges with the cover elements in terms of the axis (direction).

[0012] The upper end of the joint body 116 is the vertical pipe connection portion 116a, and the lower end of the joint body 116 is the vertical pipe connection portion 116b. Multiple horizontal pipe connection sections 117 are fixed to the upper outer surface of the joint body 116. The multiple horizontal pipe connection sections 117 are arranged around the axis of the joint body 116, spaced apart from each other. The outer surface of the joint body 116 is covered by a collective sound insulation member 119. The collective sound insulation member 119 comprises a collective sound-absorbing cover that covers the outer surface of the joint body 116, and a collective sound insulation cover that covers the outer surface of the collective sound-absorbing cover (these reference numerals are omitted). The material of the collective sound-absorbing cover and the collective sound insulation cover is the same as the material of the sound-absorbing material 21 and sound insulation material 30 described later. The collective sound insulation member 119 is attached to the joint body 116 with adhesive tape 120.

[0013] The portion of the joint body 116 below the multiple horizontal pipe connection sections 117 is located within the slab penetration hole 101a of the floor slab 101. That is, the multiple horizontal pipe connection sections 117 are located on the floor slab 101. The lower end of the joint body 116 (vertical pipe connection section 116b) is located below the floor slab 101. Mortar 122 is filled between the opening periphery of the slab penetration hole 101a in the floor slab 101 and the collective sound insulation member 119.

[0014] The vertical pipe 112 is positioned so that its axis aligns with the vertical direction. The lower end of the vertical pipe 112 is connected to the vertical pipe connection portion 116a of the joint body 116. The end of the horizontal pipe 113 is connected to the horizontal pipe connection portion 117 of the manifold joint 111. The horizontal pipe 113 is positioned to have a water slope, gradually inclining upward as it moves away from the manifold joint 111.

[0015] As shown in Figures 1 and 2, the leg joint 5 comprises a joint 10 and a sound-insulating member 20. The joint 10 comprises a first socket 11, a second socket 12, a bent portion 13, a leg body 14, and a cleaning port 15. The second socket 12 has a second central axis O2 that intersects with the first central axis O1 of the first socket 11. Here, the plane containing the first central axis O1 and the second central axis O2 is defined as the reference plane S1. The curved portion 13 is formed in a curved tubular shape and is connected to the first socket 11 and the second socket 12, respectively. On the reference plane S1, the central angle of the curved portion 13 with respect to its central axis (the angle at which the curved portion 13 is curved) is approximately 90 degrees.

[0016] As shown in Figures 1 and 3, the leg body 14 is formed in a cylindrical shape in this example. The leg body 14 is positioned so that its axis aligns with the first central axis O1 of the first socket 11. The first end of the leg body 14 is fixed to the outer surface of the convex side of the curved portion 13, which curves so that the curved portion 13 becomes convex. In this example, the cleaning port 15 is formed in a cylindrical shape. The cleaning port 15 is positioned above the second central axis O2 and along the second central axis O2. The base end of the cleaning port 15 is provided on the lower outer surface of the first receiving port 11 at the bend 13. A cover portion 16 is detachably attached to the tip of the cleaning port 15. The cleaning port 15 is opened and closed by attaching or detaching the cover portion 16. The joint 10 is positioned such that the first central axis O1 of the first socket 11 is aligned in the vertical direction. The first socket 11 and the vertical pipe connection portion 116b of the manifold joint 111 are connected by a connecting pipe 124. The end of the horizontal pipe 113 is connected to the second socket 12.

[0017] As shown in Figures 1 and 2, the sound insulation member 20 comprises a sound-absorbing material 21 and a sound-insulating material 30. The configurations of the sound-absorbing material 21 and the sound-insulating material 30 will be described below with reference to the figures, but the orientation in which the sound-absorbing material 21 and the sound-insulating material 30 are used is not limited to the orientation shown in the figures.

[0018] As shown in Figures 1 and 4, the sound-absorbing material 21 covers the outer surface of the bent portion 13 of the joint 10. In Figures 4 and below, the parts of the sound-absorbing material 21 and sound-insulating material 30 that are connected to each other are indicated with the same type of hatching. A three-dimensional sound-absorbing material 21 is formed by bending a flat sound-absorbing material 21 and connecting it with adhesive tape or the like. The sound-absorbing material 21 is formed in a single unit. The sound-absorbing material 21 comprises a strip-shaped piece 22, a first tongue piece 23, and a second tongue piece 24.

[0019] The strip-shaped piece 22 is formed in a rectangular shape in plan view, with the strip being elongated in a predetermined direction when unfolded. In the sound-absorbing material 21, both outer edges 22a along the shorter direction of the strip-shaped piece 22 are connected to each other by adhesive tape (not shown), and the strip-shaped piece 22 is formed in a cylindrical shape. In the sound-absorbing material 21, one outer edge 22b along the longitudinal direction of the strip-shaped piece 22 forms a first opening 21a into which the second receiving opening 12 of the joint 10 is positioned.

[0020] The first tongue piece 23 and the second tongue piece 24 are positioned on the other outer edge 22c of the strip-shaped piece 22 along its longitudinal direction. When unfolded, the first tongue piece 23 and the second tongue piece 24 extend toward the opposite side from the strip-shaped piece 22. The width of the first tongue piece 23 and the second tongue piece 24 gradually narrows towards the tip extending from the strip-shaped piece 22. In a plan view when unfolded, the first tongue piece 23 and the second tongue piece 24 are formed in a triangular shape. The first tongue piece 23 and the second tongue piece 24 are positioned side by side along the outer edge 22c of the strip-shaped piece 22.

[0021] Here, in the sound-absorbing material 21, the outer edges sandwiched between the first tongue piece 23 and the second tongue piece 24 are referred to as outer edges 23a and 24a. In the sound-absorbing material 21, the outer edges 23a and 24a are connected to each other by adhesive tape (not shown). In the sound-absorbing material 21, a second opening 21b is formed at the outer edge 23a of the first tongue piece 23, the outer edge 24a of the second tongue piece 24, and the outer edge 22c of the strip-shaped piece 22, into which the leg body 14 of the joint 10 is positioned. The leg body 14 protrudes outward through the second opening 21b. In the sound-absorbing material 21, a third opening 21c is formed at the outer edges of the first tongue piece 23 and the second tongue piece 24, which are on the outer sides of each other, into which the end of the curved portion 13 on the first receiving end 11 side is positioned.

[0022] A first curved edge 23b is formed concavely on the outer edge 23a of the first tongue piece 23. The first curved edge 23b is formed in a semi-circular arc shape. A second curved edge 24b is formed concavely on the outer edge 24a of the second tongue piece 24. The second curved edge 24b is formed in a semi-circular arc shape. A hole (fourth opening) 21d is formed in the first curved edge 23b and the second curved edge 24b. The hole 21d is located at a position corresponding to the cleaning port 15. The cleaning port 15 protrudes to the outside of the sound-absorbing material 21 through the hole 21d. The periphery of the hole 21d is arranged along the outer circumference of the cleaning port 15.

[0023] The sound-absorbing material 21 is formed, for example, from needle felt. For example, needle felt contains 40% to 50% polyethylene terephthalate, 35% to 45% acrylic fibers, and 10% to 20% wool or rayon. When manufacturing needle felt, a needle with a barb is inserted into the needle felt, and the fibers are mechanically intertwined. The sound-absorbing material 21 may be formed from thermal felt, PET felt, or other types of felt, or from an acrylic fiber mixture. The density of the sound-absorbing material 21 is preferably 80 kg / m³ or more. The thickness of the sound-absorbing material 21 is preferably about 10 mm. Since the sound-absorbing material 21 is made of a softer material than the sound-insulating material 30, it can be formed in an unfolded shape to cover the outer surface of the joint 10.

[0024] As shown in Figure 1, the sound insulation member 20 preferably includes a foam tape 26 that covers the outer surface of the second socket 12 of the joint 10. The foam tape 26 is positioned on the opposite side of the curved portion 13 from the sound absorbing material 21. The foam tape 26 is preferably about the same thickness as the sound absorbing material 21 and harder than the sound absorbing material 21. The surface density of the sound absorbing material 21 is 1.0 kg / m². 2 It is preferable that it be to a certain degree.

[0025] As shown in Figure 1, the sound insulation material 30 is used in the leg joint 5. The sound insulation material 30 covers the outer surface of the sound absorbing material 21 and the foam tape 26. That is, the sound insulation material 30 covers the outer surface of the joint 10 via the sound absorbing material 21. The sound insulation material 30 comprises a first portion 31, a second portion 51, and a third portion 58.

[0026] As shown in Figures 5 and 6, the first part 31 is formed as a single unit. The first part 31 comprises an intermediate flat piece 32, a first flat piece 34, and a pair of side pieces 35A and 35B. In Figure 5, the first adhesive tape 43 and the second adhesive tape 44 are shown by dashed lines. By folding the planar (flat) first part 31 and connecting it with adhesive tape, a three-dimensional first part 31 is formed.

[0027] The intermediate flat piece 32 is flat. Here, "flat" means, for example, in a cross-section along the reference plane S1, that on both sides of the intermediate flat piece 32 in the thickness direction, the ratio of the length in the thickness direction of the surface to the length of the most convex portion and the most concave portion of the intermediate flat piece 32 in the thickness direction, relative to the longitudinal length of the surface, is 10% or less. A ratio of 5% or less is more preferable. The intermediate flat piece 32 has a rectangular shape when viewed in the thickness direction of the intermediate flat piece 32 as shown in Figure 6. Here, "rectangular" means, for example, that the ratio of the length of one of the pair of first outer edges 32a (described later) to the length of the other is 30% or less, and the ratio of the length of one of the pair of second outer edges 32b (described later) to the length of the other is 30% or less. It is more preferable that this ratio be 20% or less.

[0028] Here, the rectangular intermediate flat piece 32 has two pairs of outer edges that are arranged along each other. Of the two pairs of outer edges, one pair is called the pair of first outer edges 32a, and the other pair is called the pair of second outer edges 32b. The pair of second outer edges 32b are different from the pair of first outer edges 32a among the four outer edges that the intermediate flat piece 32 has. In a plan view, the pair of first outer edges 32a and the pair of second outer edges 32b are positioned on opposite sides of the central part of the intermediate flat piece 32. The first outer edges 32a and the second outer edges 32b are arranged in a continuous manner.

[0029] As shown in Figures 5 and 6, the intermediate flat piece 32 is positioned such that a pair of first outer edges 32a are aligned with the reference plane S1 (see also Figure 6 for one of the pair of first outer edges 32a). The second outer edge 32b located on the first socket 11 side of the pair of second outer edges 32b is also called the second outer edge 32b1. The second outer edge 32b1 is formed in a concave, curved shape. The second outer edge 32b located on the second socket 12 side of the pair of second outer edges 32b is also called the second outer edge 32b2.

[0030] A through-hole 32c is formed at the end of the intermediate flat piece 32 on the second outer edge 32b2 side, into which the leg 14 of the joint 10 is positioned. The leg 14 protrudes outward through the through-hole 32c (see Figure 1). The intermediate flat piece 32 is flat when the unfolded first portion 31 is folded to form the first portion 31.

[0031] As shown in Figures 1 and 5, the intermediate flat piece 32 is in contact with the convex outer surface of the curved portion 13 via the sound-absorbing material 21. The intermediate flat piece 32 is inclined so as it moves away from the first socket 11 along the first central axis O1, it gradually approaches the second socket 12. The first flat piece 34 has a rectangular shape when viewed in the thickness direction. The width of the first flat piece 34 gradually narrows as it moves away from the intermediate flat piece 32. The first flat piece 34 extends from the second outer edge 32b2 along the second central axis O2 (see Figure 1). The first flat piece 34 is preferably flat when the unfolded first portion 31 is folded to form the first portion 31.

[0032] As shown in Figures 5 and 6, in the first embodiment, the configuration of side piece 35A and the configuration of side piece 35B are symmetrical with respect to the reference plane S1. For this reason, the configuration of side piece 35A is indicated by adding the capital letter "A" to the number. The configuration of side piece 35B that corresponds to side piece 35A is indicated by adding the capital letter "B" to the same number as side piece 35A. This omits redundant explanations. For example, the main body portion 38A of side piece 35A and the main body portion 38B of side piece 35B, which will be described later, have the same configuration.

[0033] The side piece 35A is provided on the first outer edge 32a1, which is one of the pair of first outer edges 32a of the intermediate flat piece 32. The side piece 35A comprises a main body portion 38A, a first tongue portion 39A, and a second tongue portion 40A. The main body portion 38A is provided on the first outer edge 32a1. The main body portion 38A extends from the first outer edge 32a1 along the first circumferential direction of the curved portion 13. The first tongue portion 39A extends from the outer edge of the main body portion 38A on the side of the first receiving opening 11 (see also Figure 1). The main body portion 38A has a notch 46A formed between the first tongue portion 39A and the intermediate flat piece 32. The notch 46A is formed in a V-shape that opens in a direction that separates the first tongue portion 39A from the main body portion 38A. The distance between the intermediate flat piece 32 and the first tongue portion 39A of the side piece 35A gradually increases as it moves away from the main body portion 38A. The notch 46A has a pair of outer edges that are connected to each other.

[0034] The second tongue portion 40A extends from the outer edge of the main body portion 38A on the second receiving end 12 side (see also Figure 1). The second tongue portion 40A is connected to the first flat piece 34 by the first adhesive tape 43. At this time, the outer edge of the second tongue portion 40A (side piece 35A) on the first flat piece 34 side is connected to the outer edge of the first flat piece 34 on the second tongue portion 40A side. For example, the first adhesive tape 43 is attached along the first central axis O1 and the second central axis O2. The distance between the first flat piece 34 and the second tongue portion 40A of the side piece 35A gradually increases as it moves away from the intermediate flat piece 32. That is, the notch 47A formed between the first flat piece 34 and the second tongue portion 40A is formed in a V-shape that opens away from the intermediate flat piece 32.

[0035] The side pieces 35A and 35B are wrapped around the entire circumference of the outer surface of the curved portion 13 together with the intermediate flat piece 32 and connected to each other by a second adhesive tape 44. For example, the second adhesive tape 44 is applied along the second central axis O2. In the first portion 31, the side pieces 35A and 35B form a first opening 31a into which the end of the curved portion 13 on the first socket 11 side is positioned. The first flat piece 34 and the side pieces 35A and 35B form a second opening 31b into which the second socket 12 of the joint 10 (the end of the curved portion 13 on the second socket 12 side) is positioned.

[0036] The first portion 31 is connected at a pair of outer edges in the notch 46A. As a result, the first portion 31 has a notch 31c formed by the second outer edge 32b1 and the first tongue portions 39A and 39B of the intermediate flat piece 32. The notch 31c is formed in a U-shape along the outer circumference of the cleaning port 15, which will be described later. The notch 31c is located at a position corresponding to the cleaning port 15. The cleaning port 15 protrudes to the outside of the first portion 31 through the notch 31c. The periphery of the notch 31c is arranged along the outer circumference of the cleaning port 15. As shown in Figure 1, the end of the first portion 31 on the side of the first socket 11 and the first socket 11 are connected to each other by adhesive tape 45. The adhesive tape 45 is wrapped around the entire circumference of the first socket 11.

[0037] The thickness of the first portion 31 is preferably about 1 mm to 5 mm, and more preferably about 2 mm. The surface density of the first portion 31 is 1 kg / m 2 ~8kg / m 2 Preferably, it is 3.4 kg / m 2 It is preferable to have a degree of saturation. The first part 31 is formed of an elastic resin material, such as an olefin-based material (a resin composition containing 300 parts by mass of inorganic filler per 100 parts by mass of olefin-based resin).

[0038] The inorganic filler is not particularly limited. For example, 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, dolomite, hydrotalcite, calcium sulfate, barium sulfate, gypsum fiber, calcium silicate, talc, clay, mica, montmorillonite, bentonite, activated clay, sepiolite, imogolite, sericite, glass fiber, glass beads, silica-based balloons, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balloons, charcoal powder, various metal powders, potassium titanate, magnesium sulfate, lead zirconate titanate, aluminum borate, molybdenum sulfide, silicon carbide, stainless steel fiber, zinc borate, various magnetic powders, slag fiber, fly ash, dehydrated sludge, etc. may be mentioned. Among these, it is preferable to use calcium carbonate 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.

[0039] The olefin resin is not particularly limited. For example, low density polyethylene (PE), high density polyethylene, linear low density polyethylene, atactic polypropylene, isotactic polypropylene, syndiotactic polypropylene, poly α-olefin may be mentioned. Among them, polyethylene with a density of 0.87 g / cm 3 ~0.93 g / cm 3 is preferable as the olefin resin. If the density is less than 0.87 g / cm 3 , the strength of the first part 31 is not sufficient, and if it exceeds 0.93 g / cm 3 , there is a risk that the first part 31 will buckle when the first part 31 is flattened. Also, if the flexural modulus of the olefin resin is 100 kg / cm 2 ~3000 kg / cm 2 , it is sufficient in terms of strength and winding processability. The first part 31 may be formed of a material other than the olefin-based material, for example, polyvinyl chloride resin, polystyrene resin, ABS resin, AS resin, thermoplastic elastomer (TPE) or other elastomer material may be used. Since the first part 31 is made of a harder material than the sound-absorbing material 21, it needs to be formed from an unfolded shape.

[0040] As shown in Figures 1 and 6, the first portion 31 is used to cover the outer surface of the curved portion 13 in the joint 10. In the first portion 31, the first flat piece 34 extends from the second outer edge 32b2 toward the opposite side from the intermediate flat piece 32. The side piece 35A is provided on the first outer edge 32a1 and extends toward the opposite side from the intermediate flat piece 32. The main body 38A extends from the first outer edge 32a1 along the second outer edge 32b toward the opposite side from the intermediate flat piece 32. The first tongue portion 39A extends from the outer edge of the main body portion 38A on the side of the first receiving opening 11 toward the opposite side of the main body portion 38A. The width of the first tongue portion 39A (length in the direction along the second outer edge 32b) gradually narrows as it moves away from the main body portion 38A. The second tongue portion 40A extends from the outer edge of the main body portion 38A on the side of the first flat piece 34 (second receiving opening 12) toward the opposite side of the main body portion 38A. The width of the second tongue portion 40A gradually narrows as it moves away from the main body portion 38A. The tongue portions 39A and 40A have a triangular shape when viewed from above.

[0041] The side piece 35B is provided on the first outer edge 32a2 and extends toward the opposite side from the intermediate flat piece 32. The side piece 35B has a main body 38B, a first tongue 39B, and a second tongue 40B, which are configured in the same way as the main body 38A, first tongue 39A, and second tongue 40A of the side piece 35A.

[0042] As shown in Figures 1 and 5, the second part 51 covers the cleaning port 15 from the outside. In Figure 5, the cleaning port 15 of the joint 10 is shown with dashed lines. The second part 51 is arranged, for example, coaxially with respect to the cleaning port 15. The second part 51 has a cover portion 52, a first protruding piece 53, and a second protruding piece 54.

[0043] As shown in Figures 5, 7, and 8, the cover portion 52 is formed in the shape of a rectangular box, for example, with a top portion 52a, a pair of side portions 52b, and a pair of side portions 52c. The pair of side portions 52b are arranged opposite each other. The pair of side portions 52c are also arranged opposite each other. The cover portion 52 has an opening 52d on the opposite side of the top portion 52a. Inside the cover portion 52, sound-absorbing material 55 for the cleaning port is provided along the top portion 52a, the pair of side portions 52b, and the pair of side portions 52c of the cover portion 52. The cover portion 52 and the sound-absorbing material 55 for the cleaning port can cover the cleaning port 15 by placing them over the cleaning port 15 through the opening 52d.

[0044] The first protruding piece 53 extends from the side facing the side piece 35A in the opening 52d. The first protruding piece 53 is positioned along the side piece 35A. The first protruding piece 53 is connected to the side piece 35A by a connecting member 56. The second protruding piece 54 extends from the side facing the side piece 35B in the opening 52d. The second protruding piece 54 is positioned along the side piece 35B. The second protruding piece 54 is connected to the side piece 35B by a connecting member 56. As the connecting member 56, for example, a hook-and-loop fastener, adhesive tape, or a cord-like member such as an Insulok® (registered trademark) may be used, but it is particularly preferable to use a hook-and-loop fastener. In the first embodiment, the connecting member 56 will be described as a hook-and-loop fastener.

[0045] When a hook-and-loop fastener is used as the connecting member 56, one hook-and-loop fastener is provided on the side of the first protruding piece 53 facing the side piece 35A, and the other hook-and-loop fastener is provided on the side of the side piece 35A facing the first protruding piece 53. The first protruding piece 53 is connected to the side piece 35A by connecting one hook-and-loop fastener to the other hook-and-loop fastener. One hook fastener is provided on the side of the second protruding piece 54 facing the side piece 35B, and the other hook fastener is provided on the side of the side piece 35B facing the first protruding piece 53. The second protruding piece 54 is connected to the side piece 35B by connecting one hook fastener to the other. As a result, the second portion 51 is kept covering the cleaning opening 15 from the outside. The second part 51 is made of the same material as the first part 31. The sound-absorbing material 55 for the cleaning port is made of the same material as the sound-absorbing material 21.

[0046] As shown in Figures 1 and 9, the third portion 58 is formed in a cylindrical shape. The third portion 58 covers the outer surface of the second socket 12 of the joint 10 via the sound-absorbing material 21. The third portion 58 is positioned offset from the first portion 31 in a direction along the second central axis O2. That is, the end of the first portion 31 on the second socket 12 side and the third portion 58 are positioned side by side, butting together in a direction along the second central axis O2.

[0047] The first part 31 and the third part 58 are connected to each other by adhesive tape 45. The adhesive tape 45 is wrapped around the entire circumference of the third part 58. The third part 58 and the foam tape 26 are connected to each other by adhesive tape 45. The adhesive tape 45 is wrapped around the entire circumference of the foam tape 26. The unfolded third part 58 is formed in a strip shape. The third part 58 is made of the same material as the first part 31.

[0048] Next, the second to twelfth embodiments will be described with reference to Figures 10 to 30. In the second to twelfth 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 are omitted.

[0049] (Second Embodiment) The first part 60 of the second embodiment will be described with reference to Figure 10. As shown in Figure 10, the first part 60 integrally includes the second flat piece 61. The first part 60 has a hole 60a in the second flat piece 61. The first part 60 differs from the first part 31 of the first embodiment only in that the second flat piece 61 has a hole 60a; otherwise, it is the same as the first part 31.

[0050] The second flat piece 61 has a rectangular shape when viewed in the thickness direction. The width of the second flat piece 61 (length in the direction along the second outer edge 32b) gradually narrows as it moves away from the intermediate flat piece 32. The second flat piece 61 extends from the second outer edge 32b1 along the first central axis O1 (see Figure 1). It is preferable that the second flat piece 61 is flat when folded from the unfolded state.

[0051] The hole 60a is formed in a circular shape along the outer circumference of the cleaning port 15 (see Figure 1). The hole 60a is located at a position corresponding to the cleaning port 15. The cleaning port 15 protrudes outside the first portion 31 through the hole 60a (see Figure 1). The periphery of the hole 60a is positioned along the outer circumference of the cleaning port 15.

[0052] (Third embodiment) The first part 63 and the second part 64 of the third embodiment will be described with reference to Figures 11 and 12. As shown in Figures 11 and 12, the first portion 63 is formed singly. The first portion 63 is integrally provided with a second portion 64 in place of the second flat piece 61 of the second embodiment. Therefore, the second portion 51 can be removed from the sound insulation material 30 of the first embodiment. The first portion 63 differs from the first portion 60 of the second embodiment in that the second flat piece 61 has been removed from the first portion 60 of the second embodiment, but the other configurations are the same as the first portion 60.

[0053] The second part 64 has a rectangular shape when viewed in the thickness direction of the second part 64. The width of the second part 64 (length in the direction along the second outer edge 32b) is formed to be constant. When the second portion 64 is folded from the second outer edge 32b1, it extends along the first central axis O1 from the second outer edge 32b1. When the second portion 64 is folded from the second outer edge 32b1, it is formed to cover the cleaning port 15.

[0054] (Fourth Embodiment) The first part 66 and the second part 67 of the fourth embodiment will be described with reference to Figures 13 and 14. As shown in Figures 13 and 14, the first portion 66 is formed singly. The first portion 66 is integrally provided with a second portion 67 in place of the second portion 64 of the third embodiment. Therefore, the second portion 51 can be removed from the sound insulation material 30 of the first embodiment. The first portion 66 differs from the first portion 31 of the first embodiment in that the notch 46A has been removed, but the other configurations are the same as the first portion 31.

[0055] The second portion 67 is integrally provided with the first tongue portion 39A of the first portion 66. The second portion 67 has a rectangular shape when viewed in the thickness direction of the second portion 64. The second portion 67 extends along the second outer edge 32b1 and the first tongue portion 39B. The second portion 67 has an outer edge 67a that faces the second outer edge 32b1 and the first tongue portion 39B. The outer edge 67a is formed in a convex curved shape. Here, the second outer edge 32b1 is formed in a concave curved shape. That is, the outer edge 67a is formed in a curved shape along the second outer edge 32b1.

[0056] When the second portion 67 is folded from the first tongue portion 39A, it extends along the first central axis O1 from the first tongue portion 39A. When the second portion 67 is folded from the first tongue portion 39A, it is formed to cover the cleaning port 15.

[0057] (Fifth embodiment) The sound-absorbing material 71 and the first part 72 of the fifth embodiment will be described with reference to Figures 15 to 18. As shown in Figure 15, the joint 70 is positioned so that the cleaning port 15 intersects (orthogonal in the fifth embodiment) the reference plane S1 on the second central axis O2 and is oriented laterally. The base end of the cleaning port 15 is provided on the outer surface between the second receiving port 12 and the first central axis O1 at the bent portion 13.

[0058] As shown in Figures 15 and 16, the sound-absorbing material 71 has a hole 71a in the second tongue piece 24. The sound-absorbing material 71 differs from the sound-absorbing material 21 of the first embodiment in that a hole 71a is provided in place of the first curved edge 23b and second curved edge 24b of the first embodiment; otherwise, the configuration is the same as the sound-absorbing material 21. The hole 71a is provided in the second tongue piece 24. The hole 71a is formed in a circular shape along the outer circumference of the cleaning port 15. The hole 71a is provided at a position corresponding to the cleaning port 15. The cleaning port 15 protrudes to the outside of the sound-absorbing material 71 through the hole 71a. The periphery of the hole 71a is arranged along the outer circumference of the cleaning port 15.

[0059] As shown in Figures 17 and 18, the first part 72 is provided with a hole 72a in place of the hole 60a in the second embodiment. The first part 72 differs from the first part 60 of the second embodiment only in that it is provided with a hole 72a in place of the hole 60a; otherwise, its configuration is the same as the first part 60. The hole 72a is provided in the second tongue portion 40A. The hole 72a is formed in a circular shape along the outer circumference of the cleaning port 15. The hole 72a is provided at a position corresponding to the cleaning port 15. The cleaning port 15 protrudes to the outside of the first part 72 through the hole 72a. The periphery of the hole 72a is arranged along the outer circumference of the cleaning port 15. The cleaning port 15 protruding from the first part 72 is covered by the second part 51.

[0060] (Sixth Embodiment) The first part 74 of the sixth embodiment will be described with reference to Figure 19. As shown in Figure 19, the first part 74 has a notch 74a instead of the hole 72a of the fifth embodiment. The first part 74 differs from the first part 72 of the fifth embodiment only in that it has a notch 74a instead of the hole 72a of the fifth embodiment; all other configurations are the same as the first part 72.

[0061] The notch 74a is provided in the second tongue portion 40A. The notch 74a is formed along the outer circumference of the cleaning port 15. The notch 74a is provided at a position corresponding to the cleaning port 15. The cleaning port 15 protrudes outside the first portion 74 through the notch 74a. The periphery of the notch 74a is positioned along the outer circumference of the cleaning port 15.

[0062] (Seventh Embodiment) The first part 76 and the second part 77 of the seventh embodiment will be described with reference to Figures 20 and 21. As shown in Figures 20 and 21, the first part 76 has the second part 77 integrally attached to it. The first part 76 differs from the first part 72 of the sixth embodiment only in that the second part 77 is integrally attached to it; otherwise, its configuration is the same as that of the first part 72. The second portion 77 is integrally provided with the second tongue portion 40A of the first portion 76. The second portion 77 has a rectangular shape when viewed in the thickness direction of the second portion 77. When the second portion 64 is bent from the second tongue portion 40A, it extends from the second tongue portion 40A along the second central axis O2. When the second portion 77 is bent from the second tongue portion 40A, it is formed to cover the cleaning port 15.

[0063] (Eighth embodiment) The sound-absorbing material 81 and the first part 82 of the eighth embodiment will be described with reference to Figures 22 to 24. As shown in Figure 22, the joint 80 has a cleaning port 15 positioned downward along the reference plane S1 on the second central axis O2. The base end of the cleaning port 15 is provided on the outer surface between the second receiving port 12 and the leg body 14 at the bent portion 13.

[0064] As shown in Figures 22 and 23, the sound-absorbing material 81 has a hole 81a in place of the hole 71a in the fifth embodiment. The sound-absorbing material 81 differs from the sound-absorbing material 71 of the fifth embodiment only in that a hole 81a is provided in place of the hole 71a in the fifth embodiment; otherwise, its configuration is the same as the sound-absorbing material 71. The hole 81a is provided between the first tongue piece 23 and the second tongue piece 24 in the strip-shaped piece 22. The hole 81a is formed in a circular shape along the outer circumference of the cleaning port 15. The hole 81a is provided at a position corresponding to the cleaning port 15. The cleaning port 15 protrudes to the outside of the sound-absorbing material 81 through the hole 81a. The periphery of the hole 81a is arranged along the outer circumference of the cleaning port 15.

[0065] As shown in Figures 22 and 24, the first part 82 is provided with a hole 82a in place of the hole 72a in the fifth embodiment. The first part 82 differs from the first part 72 of the fifth embodiment only in that it is provided with a hole 82a in place of the hole 72a in the fifth embodiment; otherwise, its configuration is the same as the first part 72. The hole 82a is provided in the first flat piece 34. The hole 82a is formed in a circular shape along the outer circumference of the cleaning port 15. The hole 82a is provided at a position corresponding to the cleaning port 15. The cleaning port 15 protrudes to the outside of the first part 82 through the hole 82a. The periphery of the hole 82a is arranged along the outer circumference of the cleaning port 15. The cleaning port 15 protruding from the first part 82 is covered by the second part 51 (see Figure 18).

[0066] (Ninth Embodiment) The first part 84 and the second part 85 of the ninth embodiment will be described with reference to Figure 25. As shown in Figure 25, the first portion 84 is formed of multiple parts. The first portion 84 is formed of two parts along the reference plane S1 (see Figure 1). The first portion 84 comprises a first part 84a and a second part 84b. The first portion 84 may be formed of two or more parts. The first part 84a has a first piece 32d, a second piece 34a, a third piece 61a, and a side piece 35A. The second part 84b has a first piece 32e, a second piece 34b, a third piece 61b, and a side piece 35B.

[0067] The first part 84 is used by, for example, attaching the first part 84a and the second part 84b together with their butts facing each other along a reference plane S1 (see Figure 1). In this state, the first piece 32d and the first piece 32e form an intermediate flat piece 32. The second piece 34a and the second piece 34b form a first flat piece 34. The third piece 61a and the third piece 61b form a second flat piece 61. Thus, the first part 84 has an intermediate flat piece 32, a first flat piece 34, a second flat piece 61, a side piece 35A, and a side piece 35B. In other words, the first part 84 is formed similarly to the sound insulation material of the second embodiment, with the hole 60a removed from the first part 60.

[0068] The second part 85 has a third part 85a and a fourth part 85b. The third part 85a is integrally provided with the first part 84a. The third part 85a extends from a portion of the first piece 32d and the third piece 61a to the opposite side of the side piece 35A. The third part 85a has a rectangular shape when viewed in the thickness direction of the third part 85a. When folded, the third part 85a extends along the first central axis O1 (see Figure 1) from a portion of the first piece 32d and the third piece 61a.

[0069] The fourth part 85b is integrally attached to the second part 84b. The fourth part 85b extends from a portion of the first piece 32e and the third piece 61b to the opposite side of the side piece 35B. The fourth part 85b has a rectangular shape when viewed in the thickness direction. When folded, the fourth part 85b extends along the first central axis O1 (see Figure 1) from a portion of the first piece 32e and the third piece 61b. The fourth part 85b, for example, when folded, abuts against or partially overlaps with the folded third part 85a. In this state, the third part 85a and the fourth part 85b constitute the second part 85. The second part 85 is formed to cover the cleaning opening 15 (see Figure 1).

[0070] (Tenth embodiment) The first part 87 of the tenth embodiment will be described with reference to Figure 26. As shown in Figure 26, the first part 87 is formed of multiple parts. The first part 87 differs from the first part 84 of the ninth embodiment in that the second part 85 is removed and a hole 87a is provided, but the other configurations are the same as the first part 84. The first part 87 comprises a first part 87b and a second part 87c.

[0071] The hole 87a consists of a first hole 87a1 and a second hole 87a2. The first hole 87a1 is provided in the third piece 61a of the first part 87b. The first hole 87a1 is formed in the shape of a semicircular concave. The second hole 87a2 is provided in the third piece 61b of the second part 87c. The second hole 87a2 is formed in the shape of a semicircular concave.

[0072] The first part 87 is used by attaching, for example, the first part 87b and the second part 87c together with their butts facing each other along a reference surface S1 (see Figure 1). In this state, a hole 87a is formed by the first hole 87a1 and the second hole 87a2. The hole 87a is formed in a circular shape along the outer circumference of the cleaning port 15 (see Figure 1). The hole 87a is provided at a position corresponding to the cleaning port 15. The cleaning port 15 protrudes outside the first part 87 through the hole 87a. The periphery of the hole 87a is arranged along the outer circumference of the cleaning port 15. The cleaning port 15 protruding from the first part 87 is covered by the second part 51 (see Figure 1).

[0073] (11th embodiment) The sound-absorbing material 91 and the first part 92 of the 11th embodiment will be described with reference to Figures 27 and 28. As shown in Figure 27, the sound-absorbing material 91 is formed from multiple parts. The sound-absorbing material 91 comprises a first part 91a and a second part 91b. The first part 91a constitutes the first tongue piece 23 and the second tongue piece 24 of the first embodiment. The second part 91b constitutes the strip-shaped piece 22 of the first embodiment.

[0074] The sound-absorbing material 91 is used, for example, by attaching the first part 91a and the second part 91b together. In this state, the sound-absorbing material 91 is formed by the first part 91a and the second part 91b. That is, the sound-absorbing material 91 is used in the same way as the sound-absorbing material 21 of the first embodiment.

[0075] As shown in Figure 28, the first part 92 is formed of multiple parts. The first part 92 comprises a first part 92a, a second part 92b, a third part 92c, and a fourth part 92d. The first part 92a and the second part 92b are positioned, for example, by wrapping them around the curved portion 13 (see Figure 1) of the joint 10. With the first part 92a and the second part 92b positioned on the curved portion 13, a hole 92e is formed.

[0076] The hole 92e is located at a position corresponding to the cleaning port 15 (see Figure 1). The cleaning port 15 protrudes outside the first part 92a and the second part 92b through the hole 92e. The periphery of the hole 92e is positioned along the outer circumference of the cleaning port 15. The cleaning port 15 protruding from the first part 92a and the second part 92b is covered by the second part 51 (see Figure 1). The third part 92c is positioned, for example, by wrapping it around the first socket 11 (see Figure 1) of the joint 10. The fourth part 92d is positioned, for example, by wrapping it around the second socket 12 (see Figure 1) of the joint 10.

[0077] (12th embodiment) The sound-absorbing material 94 and the first part 95 of the twelfth embodiment will be described with reference to Figures 29 and 30. As shown in Figure 29, the sound-absorbing material 94 is formed from multiple parts. The sound-absorbing material 94 comprises a first part 94a and a second part 94b. The first part 94a has a first tongue piece 23 and a first strip piece 22d according to the first embodiment. The second part 94b has a second tongue piece 24 and a second strip piece 22e according to the first embodiment.

[0078] The sound-absorbing material 94 is used by, for example, attaching the first part 94a and the second part 94b together. That is, the sound-absorbing material 94 is formed by the first part 94a and the second part 94b. In this state, the strip piece 22 of the first embodiment is formed by the first strip piece 22d and the second strip piece 22e. That is, the sound-absorbing material 94 is used in the same way as the sound-absorbing material 21 of the first embodiment.

[0079] As shown in Figure 30, the first part 95 is formed of multiple parts. The first part 95 comprises a first part 95a, a second part 95b, a third part 95c, and a fourth part 95d. The first part 95a and the second part 95b are arranged, for example, by wrapping them around the curved portion 13 (see Figure 1) of the joint 10. The first part 95a is provided with a hole 95e.

[0080] The hole 95e is located in a position corresponding to the cleaning port 15 (see Figure 1). The cleaning port 15 protrudes outside the first part 95a through the hole 95e. The periphery of the hole 95e is positioned along the outer circumference of the cleaning port 15. The cleaning port 15 protruding from the first part 95a is covered by the second part 51 (see Figure 1). The third part 95c is positioned, for example, by wrapping it around the first socket 11 (see Figure 1) of the joint 10. The fourth part 95d is positioned, for example, by wrapping it around the second socket 12 (see Figure 1) of the joint 10.

[0081] (Manufacturing method) Next, we will explain the manufacturing method of the leg joint. The following describes the manufacturing method of the leg joint 5 in the first embodiment as a representative example. The procedure for connecting the adhesive tapes 43, 44 and the connecting members 56, etc., will be omitted. As shown in Figure 1, foam tape 26 is wrapped in advance around the end of the second socket 12 of the joint 10 that is opposite to the bent portion 13. The foam tape 26 is used to create a step in the second socket 12 for the sound-absorbing material 21.

[0082] Next, the sound-absorbing material 21 is wrapped around the outer surfaces of the bent portion 13 and the second socket 12 in the joint 10. This covers the outer surfaces of the bent portion 13 and the second socket 12 with the sound-absorbing material 21. In this state, the leg body 14 protrudes outside the sound-absorbing material 21 by passing through the second opening 21b. The cleaning port 15 protrudes outside the sound-absorbing material 21 by passing through the hole 21d.

[0083] Next, the first portion 31 and the third portion 58 of the sound-insulating material 30 are wrapped around the outer surface of the sound-absorbing material 21. The third portion 58 is supported by foam tape 26. Thus, the sound-absorbing material 21 is positioned between the first portion 31 and the third portion 58 of the sound-insulating material 30 and the curved portion 13 and the second socket 12. As a result, the curved portion 13 and the second socket 12 are covered by the first portion 31 and the third portion 58 via the sound-insulating material 30. In this state, the leg 14 protrudes to the outside of the first portion 31 through the through hole 32c. The cleaning port 15 protrudes to the outside of the first portion 31 through the notch 31c.

[0084] After covering the curved portion 13 and the second socket 12 with the first portion 31 and the third portion 58, the cleaning port 15 protruding from the first portion 31 is covered with the second portion 51. This completes the process in the manufacturing method of the leg joint 5.

[0085] According to the leg joint 5 of the embodiment described above, the sound insulation material 30 of the first to twelfth embodiments is provided with a first portion 31, 60, 63, 66, 72, 74, 76, 82, 84, 87, 92, 95 and a second portion 51, 64, 67, 77, 85. The first portion 31, 60, 63, 66, 72, 74, 76, 82, 84, 87, 92, 95 covers the curved portion 13. The second portion 51, 64, 67, 77, 85 covers the cleaning opening 15. This improves the sound insulation performance of the leg joint 5 provided with the cleaning opening 15.

[0086] Furthermore, the first parts 31, 60, 63, 66, 72, 74, 76, and 82 were formed singly. Therefore, the curved section 13 can be easily covered with the first parts 31, 60, 63, 66, 72, 74, 76, and 82. In addition, holes 60a, 72a, 82a or notches 31c, 74a were provided at locations corresponding to the cleaning port 15. Therefore, the portion of the curved section 13 that avoids the cleaning port 15 can be appropriately covered with the first parts 31, 60, 63, 66, 72, 74, 76, and 82.

[0087] Furthermore, the first parts 63, 66, and 76 are formed individually, while the second parts 64, 67, and 77 are integrally provided with the first parts 63, 66, and 76. Therefore, when the curved section 13 is covered with the first parts 63, 66, and 76, the cleaning port 15 can be covered simultaneously with the second parts 64, 67, and 77. This makes it easy to cover the curved section 13 and the cleaning port 15 with the integrally provided first parts 63, 66, and 76 and second parts 64, 67, and 77.

[0088] Here, the first part covering the curved section 13 has a relatively complex shape. Therefore, the first parts 84, 87, 92, and 95 are divided into multiple parts. Thus, the shape of the divided first parts 84, 87, 92, and 95 can be simplified, and the first parts 84, 87, 92, and 95 can be easily manufactured. In addition, by making the second part 51 a separate part from the first parts 87, 92, and 95, the first parts 87, 92, and 95 can be easily manufactured. Furthermore, by integrating the second part 85 with the first part 84, the curved section 13 and the cleaning port 15 can be easily covered by the first part 84 and the second part 85.

[0089] Furthermore, the sound-absorbing materials 21, 71, and 81 were formed individually. Therefore, the curved section 13 can be easily covered with the sound-absorbing materials 21, 71, and 81. In addition, holes 21d, 71a, and 81a were provided at locations corresponding to the cleaning opening 15. Therefore, the portion of the curved section 13 that avoids the cleaning opening 15 can be appropriately covered with the sound-absorbing materials 21, 71, and 81. In this embodiment, an example is described in which holes 21d, 71a, and 81a are provided in the sound-absorbing materials 21, 71, and 81, but the embodiment is not limited to this. As another example, notches may be provided in the sound-absorbing materials 21, 71, and 81 corresponding to the cleaning opening 15.

[0090] Here, the sound-absorbing material covering the curved section has a relatively complex shape. Therefore, the sound-absorbing materials 91 and 94 were divided into multiple parts. As a result, the shape of the divided sound-absorbing materials 91 and 94 can be simplified, and the sound-absorbing materials 91 and 94 can be easily manufactured.

[0091] Furthermore, according to the sound insulation material 30 of the embodiment described above, the sound insulation material 30 is used in the leg joint 5. The sound insulation material 30 comprises a first portion 31, 60, 63, 66, 72, 74, 76, 82, 84, 87, 92, 95 and a second portion 51, 64, 67, 77, 85. The first portion 31, 60, 63, 66, 72, 74, 76, 82, 84, 87, 92, 95 covers the curved portion 13. The second portion 51, 64, 67, 77, 85 covers the cleaning opening 15. This improves the sound insulation performance of the leg joint 5 provided with the cleaning opening 15.

[0092] Furthermore, according to the manufacturing method of the leg joint 5 according to the embodiment described above, the leg joint 5 can be easily manufactured by covering the curved portion 13 with the first portion 31, 60, 63, 66, 72, 74, 76, 82, 84, 87, 92, 95 and covering the cleaning port 15 with the second portion 51, 64, 67, 77, 85.

[0093] Furthermore, according to the piping structure 1 of the embodiment described above, a manifold joint 111 is provided on the lowest floor of the building 100, and a leg joint 5 is connected to the lower side of the manifold joint 111. The leg joint 5 has a cleaning port 15, which improves its sound insulation performance. This improves the sound insulation performance of the piping structure 1.

[0094] It should be noted that the technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention.

[0095] For example, sound-absorbing material is not necessary.

[0096] Furthermore, it is possible to replace the components in this embodiment with well-known components as appropriate, without departing from the spirit of the present invention.

[0097] (Note) The above embodiment can be understood, for example, as follows:

[0098] <1> A leg joint according to one aspect of the present invention is a leg joint comprising a cleaning port, a bent portion, and a sound-insulating material, wherein the cleaning port is provided in the bent portion, and the sound-insulating material comprises a first portion that covers the bent portion and a second portion that covers the cleaning port.

[0099] The leg joint is provided with a sound-insulating material consisting of a first part and a second part. The first part covers the curved section. The second part covers the cleaning opening. This improves the sound-insulating performance of the leg joint provided with the cleaning opening.

[0100] <2> the above <1> In the leg joint relating to the above, the first portion may be singular and have a hole or notch corresponding to the cleaning port.

[0101] In the leg joint, the first part is formed as a single unit. Therefore, the curved section can be easily covered by the first part. In addition, a hole or notch is provided at the location corresponding to the cleaning port. Therefore, the portion of the curved section that avoids the cleaning port can be appropriately covered by the first part.

[0102] <3> the above <1> In the leg joint relating to this, the first part may be singular, and the second part corresponding to the cleaning port may be integrally provided.

[0103] In this leg joint, the first part is formed separately, and the second part is integrally attached to the first part. Therefore, when the curved section is covered with the first part, the cleaning opening can be covered simultaneously with the second part. This makes it easy to cover the curved section and the cleaning opening with the integrally attached first and second parts.

[0104] <4> the above <1> In the leg joint relating to this, the first part may consist of multiple parts, and the second part corresponding to the cleaning port may be provided as an integral part or as a separate part.

[0105] Here, the first part covering the curved section has a relatively complex shape. Therefore, the first part is divided into multiple parts. As a result, the shape of the divided first part can be simplified, and the first part can be easily manufactured. Furthermore, by making the second part separate from the first part, the first part can be easily manufactured. Moreover, by integrating the second part with the first part, the curved section and the cleaning opening can be easily covered by the first and second parts.

[0106] <5> the above <2> from <4> In a leg joint relating to any one of the above, a sound-absorbing material is provided between the curved portion and the first portion, and the sound-absorbing material may be singular and have a hole or notch corresponding to the cleaning port.

[0107] In the leg joint, the sound-absorbing material is formed in a single piece. Therefore, the curved section can be easily covered with the sound-absorbing material. In addition, a hole or notch is provided in the location corresponding to the cleaning port. Therefore, the part of the curved section that avoids the cleaning port can be properly covered with the sound-absorbing material.

[0108] <6> the above <2> from <4> In a leg joint relating to any one of the above, a sound-absorbing material is provided between the curved portion and the first portion, and the sound-absorbing material may consist of multiple pieces and may have holes or notches corresponding to the cleaning port.

[0109] In this case, the sound-absorbing material covering the curved section has a relatively complex shape. Therefore, the sound-absorbing material was divided into multiple sections. As a result, the shape of the divided sound-absorbing material can be simplified, and the sound-absorbing material can be manufactured more easily.

[0110] <7> A sound-insulating material according to one aspect of the present invention is the above <1> It is used in the leg joints described above.

[0111] The sound insulation material comprises a first part and a second part. The first part covers the curved section. The second part covers the cleaning opening. This improves the sound insulation performance of the leg joint where the cleaning opening is provided.

[0112] <8> A method for manufacturing a leg joint according to one aspect of the present invention is as described above. <1> A method for manufacturing a leg joint as described above, wherein the first part covers the bent portion and the second part covers the cleaning port.

[0113] According to the method for manufacturing the leg joint, the leg joint can be easily manufactured by covering the curved portion with the first part and the cleaning port with the second part.

[0114] <9> A piping structure according to one aspect of the present invention is as described above. <1> A piping structure equipped with the leg joint described above, further comprising a joint located on the lowest floor of a building, to which the leg joint is connected on the lower side.

[0115] According to the piping structure, a joint is installed on the lowest floor of the building, and a leg joint is connected to the underside of the joint. The leg joint has a cleaning port, which improves its sound insulation performance. This makes it possible to improve the sound insulation performance of the piping structure equipped with a leg joint that has a cleaning port. [Explanation of Symbols]

[0116] 1…Piping structure 5…Leg joint 13...Bend 15… Cleaning port 21…Sound-absorbing material 30…Sound insulation material 21, 71, 81, 91, 94… Sound-absorbing material 21d, 71a, 81a... Holes in sound-absorbing material 31,60,63,66,72,74,76,82,84,87,92,95…1st part 31c, 74a... Notches in the first section 51,64,67,77,85…Second part 60a, 72a, 82a, 87a, 92e, 95e... Holes in the first section 111... Manifold joint (joint)

Claims

1. A leg joint comprising a cleaning port, a curved section, and sound insulation material, The cleaning port is provided in the curved portion. The sound-insulating material comprises a first portion that covers the curved portion and a second portion that covers the cleaning opening. Leg joint.

2. The first part is singular and comprises a hole or notch corresponding to the cleaning port, The leg joint according to claim 1.

3. The first part is singular, and the second part corresponding to the cleaning port is provided integrally. The leg joint according to claim 1.

4. The first part comprises multiple components, and the second part corresponding to the cleaning port is provided as an integral or separate component. The leg joint according to claim 1.

5. The system includes a sound-absorbing material positioned between the curved portion and the first portion, The sound-absorbing material is singular and has a hole or notch corresponding to the cleaning opening. A leg joint according to any one of claims 2 to 4.

6. The system includes a sound-absorbing material positioned between the curved portion and the first portion, The sound-absorbing material comprises multiple pieces, each having a hole or notch corresponding to the cleaning opening. A leg joint according to any one of claims 2 to 4.

7. Sound insulation material for use in the leg joint described in claim 1.

8. A method for manufacturing a leg joint according to claim 1, The first part covers the curved portion, The second part covers the cleaning port, A method for manufacturing leg joints.

9. A piping structure comprising a leg joint as described in claim 1, The building is provided with a joint located on the lowest floor, to which the leg joint is further connected on the lower side. Piping structure.

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