Joint structure, joint, and collective joint system

Abstract

To provide a sound insulation cover improved in workability when attached to a joint.SOLUTION: A sound insulation cover 31 for covering an outer surface of a joint has a rectangular shape when viewed in its own thickness direction, and includes a pair of first outer edge side walls disposed along a reference surface side 32a, and a second outer edge side S1 disposed along the reference surface side wall. An intermediate flat piece 32 in contact with an outer surface of the bent pipe portion on a convex side where the bent pipe portion is convex, a first flat piece 33 extending from a second outer edge 32b1 of the intermediate flat piece along the first central axial O1, a second flat piece 34 extending from the second outer edge 32b2 along the second central axial O2, and a pair of side piece 35A and 35B respectively provided on the pair of first outer edges and respectively connected to the first flat piece and the second flat piece by a first sticking member 43, the pair of side pieces are connected to each other by a second sticking member 44 in a state of being wound over the entire circumference of the outer surface of the curved pipe part together with the intermediate flat piece.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a joint structure, a joint, and a joint assembly system. [Background technology]

[0002] As buildings have become more versatile and complex, there has been an increasing demand for improved sound insulation performance in piping systems, including drainage pipes. For example, in order to improve the sound insulation performance of a drainage pipe, it is effective to provide sufficient sound insulation to the curved parts of the drainage pipe, such as the legs of the vertical pipe, which generate a large amount of noise.

[0003] However, joints with curved pipe sections, such as leg joints, have multiple shapes, including curved surfaces, interrelated on their outer surfaces, making them more complex than straight pipes. For this reason, manufacturing joints with sound-insulating covers poses many challenges in terms of production and design, and it is not easy to improve the sound-insulating performance of the joints.

[0004] Therefore, for example, a technique has been disclosed in which a sound insulating sheet is wrapped around the outer surface of a joint to form a sound insulating cover, thereby simply improving the sound insulating performance of the joint (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-033055 Summary of the Invention [Problem to be solved by the invention]

[0006] However, there is room for improvement in the ease of attaching the soundproof cover to the joint. The present invention has been made in consideration of these problems, and aims to provide a sound-insulating cover that improves workability when attached to a joint, a sound-insulating sheet for forming the sound-insulating cover, and a sound-insulating member and joint structure that include this sound-insulating cover. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention proposes the following means. The sound-insulating cover of the present invention is a sound-insulating cover that covers an outer surface of a joint that includes a first connection portion, a second connection portion having a second center axis that intersects with a first center axis of the first connection portion, and a curved pipe portion connected to each of the first connection portion and the second connection portion, and when a plane including the first center axis and the second center axis is taken as a reference plane, the sound-insulating cover has a rectangular shape when viewed in its thickness direction, and a pair of first outer edges that are arranged to be aligned with each other in the rectangular shape are arranged to be aligned with each other in the reference plane, and the sound-insulating cover includes an intermediate flat piece that is in contact with the outer surface of the curved pipe portion on the convex side where the curved pipe portion is convex, and The curved pipe section has a pair of second outer edges arranged along each other in shape, each of which has a first flat piece extending from the second outer edge on the first connection side along the first central axis, a second flat piece extending from the second outer edge on the second connection side along the second central axis, and a pair of side pieces provided on each of the pair of first outer edges and connected to the first flat piece and the second flat piece by a first attaching member, and the pair of side pieces are connected to each other by a second attaching member while being wrapped around the entire outer surface of the curved pipe section together with the intermediate flat piece.

[0008] According to this invention, the pair of side pieces are connected to each other by the second attaching member, so that the pair of side pieces, together with the intermediate flat piece, are wrapped around the entire outer surface of the curved pipe section. The first flat piece and the pair of side pieces then cover the entire end of the curved pipe section facing the first connection section, and the second flat piece and the pair of side pieces then cover the entire end of the curved pipe section facing the second connection section. In this way, the sound-insulating cover is attached to the joint. In this case, the second attaching member is attached, for example, along the second central axis to connect the pair of side pieces to each other, and the first attaching member is attached, for example, along the first and second central axes to connect the first and second flat pieces to the pair of side pieces. Therefore, when attaching the sound-insulating cover to the joint, the attachment member does not need to be wrapped around the circumferential direction of the bent pipe portion, making the attachment work easier, thereby improving the workability when attaching the sound-insulating cover to the joint.

[0009] In the sound-insulating cover, an outer edge of the first flat piece of the side piece may be connected to an outer edge of the side piece of the first flat piece. According to this invention, the overlapping portion between the first flat piece and the side piece can be reduced, and an increase in the thickness of the sound-insulating cover can be prevented.

[0010] In addition, in the sound-proof cover, the side piece may include a main body portion extending from the first outer edge along the circumferential direction of the curved pipe portion, a first tongue portion extending from the outer edge of the main body portion on the first connection portion side and connected to the first flat piece, and a second tongue portion extending from the outer edge of the main body portion on the second connection portion side and connected to the second flat piece. According to this invention, the first joining member can connect the first tongue portion and the first flat piece, and can also connect the second tongue portion and the second flat piece.

[0011] In addition, the sound-proofing sheet of the present invention is a sound-proofing sheet used to cover the outer surface of a joint having a first connection portion, a second connection portion having a second central axis that intersects with the first central axis of the first connection portion, and curved pipe portions connected to the first connection portion and the second connection portion, respectively, and is characterized in that it has an intermediate flat piece that is rectangular when viewed in its thickness direction, a first flat piece that extends from one of a pair of second outer edges that are arranged along each other in the rectangular shape toward the opposite side of the intermediate flat piece, a second flat piece that extends from the other of the pair of second outer edges toward the opposite side of the intermediate flat piece, and a pair of side pieces that are provided on the pair of first outer edges that are arranged along each other in the rectangular shape in the intermediate flat piece, and extend toward the opposite side of the intermediate flat piece.

[0012] According to this invention, the intermediate flat piece is brought into contact with the outer surface of the convex side of the curved pipe section with a pair of first outer edges of the intermediate flat piece aligned with a reference plane including the first and second central axes, and is then bent at the pair of second outer edges so that the first flat piece extends along the first central axis, and the second flat piece extends along the second central axis. The pair of side pieces are wrapped around the entire outer surface of the curved pipe section together with the intermediate flat piece, and then the pair of side pieces are connected to each other by a second attaching member, which is attached, for example, along the second central axis. For example, the first attaching member is attached along the first central axis and the second central axis to connect the first flat piece and the second flat piece to the pair of side pieces, respectively. The above steps attach the sound-insulating sheet to the joint to form a sound-insulating cover. Therefore, when attaching the sound-insulating sheet to the joint, the attachment material does not need to be wrapped around the circumferential direction of the bent pipe portion, making the attachment work easier. This improves the workability when attaching to the joint.

[0013] In the sound-proofing sheet, the distance between the first flat piece and the side pieces may gradually increase with increasing distance from the intermediate flat piece. According to this invention, when the outer edge of the first flat piece and the outer edge of the side piece are connected by the first adhesive member and the first flat piece is positioned so that it extends along the first central axis, the overlapping area between the first flat piece and the side piece is reduced, thereby preventing the soundproof sheet from becoming thicker.

[0014] The sound-insulating member of the present invention is characterized by comprising a sound-absorbing cover that covers the outer surface of the curved pipe portion, and any of the sound-insulating covers described above that covers the outer surface of the sound-absorbing cover. According to the present invention, a sound-insulating member can be constructed using a sound-insulating cover and a sound-absorbing cover that are easier to attach to a joint.

[0015] The sound-insulating member may also include a second sound-insulating cover that covers the outer surface of the second connection portion, is positioned offset in a direction along the second central axis relative to the sound-insulating cover, and is connected to the sound-insulating cover. According to this invention, the outer surface of the second connection portion can be covered more reliably with the second sound-insulating cover.

[0016] A joint structure of the present invention is characterized by comprising the above-described sound-proofing member and the joint. According to this invention, a joint structure can be constructed using a sound insulating cover that improves the workability of attaching the sound insulating cover to the joint. [Effects of the Invention]

[0017] According to the sound-insulating cover, sound-insulating sheet, sound-insulating member, and joint structure of the present invention, the sound-insulating cover can be attached to the joint with improved workability when attached to the joint. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a cross-sectional view of a building in which a joint structure according to one embodiment of the present invention is used. [Figure 2] FIG. 2 is a perspective view of a sound-absorbing cover of the joint structure. [Figure 3] FIG. 2 is a plan view of the sound-absorbing sheet with the sound-absorbing cover unfolded. [Figure 4] FIG. 4 is a perspective view of a first sound-insulating cover of the joint structure. [Figure 5] FIG. 2 is a plan view of the first sound-insulating sheet with the first sound-insulating cover unfolded. [Figure 6] FIG. 10 is a plan view of the second sound-insulating sheet with the second sound-insulating cover of the joint structure unfolded. [Figure 7] FIG. 10 is a side view illustrating the procedure for constructing the joint structure. [Figure 8] FIG. 10 is a side view showing a modified example of the joint structure. [Figure 9] FIG. 10 is a side view showing a modified example of the joint structure. [Figure 10] FIG. 10 is a side view showing a modified example of the joint structure. [Figure 11] FIG. 10 is a side view illustrating the procedure for constructing the joint structure. [Figure 12] FIG. 10 is a side view showing a modified example of the joint structure. [Figure 13] FIG. 10 is a side view illustrating the procedure for constructing the joint structure. [Figure 14] FIG. 10 is a side view showing a modified example of the joint structure. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, one embodiment of a joint structure according to the present invention will be described with reference to FIGS. As shown in Fig. 1, a joint structure 1 of this embodiment is used in, for example, a collective joint system 110 in a building 100. In Fig. 1, a collective sound-insulating member 119 and an adhesive tape 120, which will be described later, are shown transparently and hatched. A side piece 35A and an adhesive tape 45, which will be described later, are shown by two-dot chain lines. The collective joint system 110 is used for drainage of the building 100. The collective joint system 110 is arranged on each floor of the building 100 through a slab penetration hole 101a formed in a floor slab 101 of the building 100. The joint assembly system 110 includes a joint assembly 111, a vertical pipe 112, a horizontal pipe 113, and a joint structure 1.

[0020] The collective 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 is arranged so that the axis of the joint body 116 is aligned along the vertical direction. Here, "the axis is aligned with the vertical direction" means that the acute angle formed between the axis and the vertical direction is 30 degrees or less, or the axis and the vertical direction are parallel. This acute angle is preferably 20 degrees or less. When the axis and the vertical direction do not intersect, the axis, etc. is extended by a tangent to determine the acute angle they form. The same applies to the arrangement relationship between the outer edges and the cover elements in the axis (direction).

[0021] The upper end of the joint body 116 is a vertical pipe connecting portion 116a, and the lower end of the joint body 116 is a vertical pipe connecting portion 116b. A plurality of horizontal pipe connecting portions 117 are fixed to the outer peripheral surface of the upper part of the joint body 116. The plurality of horizontal pipe connecting portions 117 are arranged around the axis of the joint body 116 at intervals from each other. The outer surface of the joint body 116 is covered by a collective sound-insulating member 119. The collective sound-insulating member 119 comprises a collective sound-absorbing cover that covers the outer surface of the joint body 116, and a collective sound-insulating cover (reference numerals for these are omitted) that covers the outer surface of the collective sound-absorbing cover. The collective sound-absorbing cover and the collective sound-insulating cover are made of the same material as the sound-absorbing cover 21 and first sound-insulating cover 31, which will be described later. The collective sound-insulating member 119 is attached to the joint body 116 with adhesive tape 120 .

[0022] The portion of the joint body 116 below the multiple horizontal pipe connection portions 117 is disposed within the slab penetration hole 101a of the floor slab 101. In other words, the multiple horizontal pipe connection portions 117 are disposed on the floor slab 101. The lower end portion (vertical pipe connection portion 116b) of the joint body 116 is disposed below the floor slab 101. Mortar 122 is filled between the opening periphery of the slab through-hole 101 a in the floor slab 101 and the collective sound-insulating member 119 .

[0023] The vertical pipe 112 is disposed so that the axis of the vertical pipe 112 is aligned in the vertical direction. The lower end of the vertical pipe 112 is connected to a vertical pipe connecting portion 116a of the joint body 116. An end of the horizontal pipe 113 is connected to a horizontal pipe connection portion 117 of the joint assembly 111. The horizontal pipe 113 is arranged so as to gradually incline upward as it moves away from the joint assembly 111, thereby providing a water gradient.

[0024] The joint structure 1 includes a joint 10 and a sound-insulating member 20. The joint 10 includes a first socket (first connection portion) 11, a second socket (second connection portion) 12, a curved pipe portion 13, and a leg body 14. The second socket 12 has a second central axis O2 that intersects with the first central axis O1 of the first socket 11. Here, a plane including the first central axis O1 and the second central axis O2 is defined as a reference plane S1. The curved pipe portion 13 is formed in a curved tubular shape and is connected to the first socket 11 and the second socket 12. On the reference plane S1, the central angle of the curved pipe portion 13 relative to the central axis (the angle at which the curved pipe portion 13 is curved) is approximately 90 degrees. In this example, leg body 14 is formed in a cylindrical shape. Leg body 14 is arranged so that the axis of leg body 14 is aligned with first central axis O1 of first socket 11. A first end of leg body 14 is fixed to the outer peripheral surface of curved pipe portion 13 on the convex side where curved pipe portion 13 is curved so as to be convex. The joint 10 is arranged so 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 joint assembly 111 are connected by a connecting pipe 124. The second socket 12 is connected to the end of the horizontal pipe 113.

[0025] The sound-insulating member 20 includes a sound-absorbing cover 21, a first sound-insulating cover (sound-insulating cover) 31, and a second sound-insulating cover 56. The configurations of the sound-absorbing cover 21, the first sound-insulating cover 31, and the second sound-insulating cover 56 will be described below with reference to the drawings, but the orientation in which the sound-absorbing cover 21, the first sound-insulating cover 31, and the second sound-insulating cover 56 are used is not limited to the orientation shown in the drawings.

[0026] The sound absorbing cover 21 covers the outer surface of the curved pipe portion 13 of the joint 10 and the like. Fig. 2 shows a perspective view of sound-absorbing cover 21, and Fig. 3 shows a plan view of sound-absorbing sheet 21A when sound-absorbing cover 21 is unfolded. Note that in Fig. 2 and subsequent figures, the parts of each cover or sheet that are connected to each other are shown with the same type of hatching. When planar (flat) sound-absorbing sheet 21A is folded and connected with adhesive tape or the like, a three-dimensional sound-absorbing cover 21 is formed. As shown in FIGS. 2 and 3, the sound absorbing cover 21 (sound absorbing sheet 21A) includes a strip 22, a first tongue piece 23, and a second tongue piece 24.

[0027] The strip 22 is formed in a rectangular shape in a plan view, elongated in a predetermined direction when unfolded. In the sound-absorbing cover 21, both outer edges 22a along the short direction of the strip 22 are connected to each other with adhesive tape (not shown), and the strip 22 is formed in a cylindrical shape. In the sound-absorbing cover 21, one outer edge 22b along the longitudinal direction of the strip 22 forms a first opening 21a into which the second socket 12 of the joint 10 is disposed. The first tongue 23 and the second tongue 24 are arranged on the other outer edge 22c along the longitudinal direction of the strip-shaped piece 22. When unfolded, the first tongue 23 and the second tongue 24 extend toward the opposite side of the strip-shaped piece 22. The widths of the first tongue 23 and the second tongue 24 gradually narrow toward the tip extending from the strip-shaped piece 22. When unfolded, the first tongue 23 and the second tongue 24 are formed in a triangular shape in a plan view. The first tongue 23 and the second tongue 24 are arranged side by side along the outer edge 22c of the strip-shaped piece 22.

[0028] Here, in the sound absorbing cover 21, the outer edges of the first tongue piece 23 and the second tongue piece 24 sandwiched between each other are referred to as outer edges 23a, 24a. In the sound absorbing cover 21, the portions of the outer edges 23a, 24a other than the ends on the strip-shaped piece 22 side are connected to each other with adhesive tape (not shown). In the sound-absorbing cover 21, a second opening 21b is formed by 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 14 of the joint 10 is disposed. In the sound-absorbing cover 21, a third opening 21c is formed by the outer edges of the first tongue piece 23 and the second tongue piece 24 that are on the outer sides of each other, into which the end of the curved pipe portion 13 on the first socket 11 side is disposed. End faces of the outer edges 23a, 24a of the sound-absorbing cover 21 abut against side surfaces of the rib 130, which will be described later. As shown in FIG. 1, if there are multiple ribs 130, the sound-absorbing cover 21 may be provided with notches or slits through which the ribs 130 pass.

[0029] The sound-absorbing cover 21 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, needles with barbs are inserted into the needle felt to mechanically entangle the fibers. The sound-absorbing cover 21 may also be made of felt such as thermal felt or PET felt, or an acrylic fiber mixture. The density of the sound-absorbing cover 21 is 80 kg / m 3 The thickness of the sound absorbing cover 21 is preferably about 10 mm. The sound absorbing cover 21 is made of a softer material than the first sound insulating cover 31, and therefore the sound absorbing cover 21 can be formed in an expanded shape like the sound absorbing sheet 21A.

[0030] As shown in Figure 1, the sound-insulating 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 disposed on the opposite side of the sound-absorbing cover 21 from the curved pipe portion 13. The foam tape 26 preferably has a thickness similar to that of the sound-absorbing cover 21, but is harder than the sound-absorbing cover 21. The surface density of the sound-absorbing cover 21 is 1.0 kg / m 2 It is preferable that the degree of

[0031] 1, the first sound-insulating cover 31 covers the outer surfaces of the sound-absorbing cover 21 and the foam tape 26. In other words, the first sound-insulating cover 31 covers the outer surface of the joint 10 via the sound-absorbing cover 21. Fig. 4 shows a perspective view of the first sound-insulating cover 31, and Fig. 5 shows a plan view of the first sound-insulating sheet (sound-insulating sheet) 31A when the first sound-insulating cover 31 is unfolded. Note that in Fig. 4, the first adhesive tape 43 and the second adhesive tape 44 are indicated by two-dot chain lines. When the planar (flat) first sound-insulating sheet 31A is folded and connected with the adhesive tape, the three-dimensional first sound-insulating cover 31 is formed. As shown in FIGS. 4 and 5, the first sound-insulating cover 31 (first sound-insulating sheet 31A) includes a middle flat piece 32, a first flat piece 33, a second flat piece 34, and a pair of side pieces 35A, 35B.

[0032] The intermediate flat piece 32 is flat. "Flat" here means that, for example, in a cross section taken along the reference plane S1, the ratio of the length of the most convex and most concave portions of the intermediate flat piece 32 in the thickness direction to the longitudinal length of the surface on both sides of the surface in the thickness direction of the intermediate flat piece 32 in the thickness direction is within 10%. It is more preferable that this ratio is within 5%. The intermediate flat piece 32 has a rectangular shape when viewed in the thickness direction of the intermediate flat piece 32 shown in Fig. 5. The rectangular shape here means, for example, that the ratio of the length of one of a pair of first outer edges 32a to the length of the other, which will be described later, is within 30%, and that the ratio of the length of one of a pair of second outer edges 32b to the length of the other, which will be described later, is within 30%. It is more preferable that this ratio is within 20%.

[0033] 4 and 5, the rectangular intermediate flat piece 32 has two pairs of outer edges arranged along each other. Of the two pairs of outer edges, one pair of outer edges is referred to as a pair of first outer edges 32a, and the other pair of outer edges is referred to as a pair of second outer edges 32b. The pair of second outer edges 32b are outer edges that 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 arranged on opposite sides of the center of the intermediate flat piece 32. The first outer edges 32a and the second outer edges 32b are arranged adjacent to each other. As shown in FIG. 1, the intermediate flat piece 32 is disposed so that a pair of first outer edges 32a are aligned along the reference plane S1 (one of the pair of first outer edges 32a is not shown). Of the pair of second outer edges 32b, the second outer edge 32b located on the first socket 11 side is also referred to as second outer edge 32b1. Of the pair of second outer edges 32b, the second outer edge 32b located on the second socket 12 side is also referred to as second outer edge 32b2.

[0034] As shown in FIG. 4, the end of the intermediate flat piece 32 on the second outer edge 32b2 side is formed with a through hole 32c in which the leg body 14 of the joint 10 is disposed. The intermediate flat piece 32 is flat when the first sound-insulating cover 31 is formed by folding the first sound-insulating sheet 31A. 1, the intermediate flat piece 32 is in contact with the outer surface of the convex side of the curved pipe portion 13 via the sound-absorbing cover 21. The intermediate flat piece 32 is inclined so as to gradually approach the second socket 12 as it moves away from the first socket 11 along the first central axis O1.

[0035] The first flat piece 33 has a rectangular shape when viewed in the thickness direction of the first flat piece 33. The width of the first flat piece 33 (the length along the second outer edge 32b) gradually narrows as it moves away from the intermediate flat piece 32. The first flat piece 33 extends from the second outer edge 32b1 along the first central axis O1 (see FIG. 1). The second flat piece 34 has a rectangular shape when viewed in the thickness direction of the second flat piece 34. The width of the second flat piece 34 gradually narrows as it moves away from the intermediate flat piece 32. The second flat piece 34 extends from the second outer edge 32b2 along the second central axis O2 (see FIG. 1). It is preferable that the first flat piece 33 and the second flat piece 34 are each flat when the first sound-insulating cover 31 is formed by folding the first sound-insulating sheet 31A.

[0036] In this embodiment, the configuration of side piece 35A and the configuration of side piece 35B are plane-symmetrical with respect to reference plane S1. For this reason, the configuration of side piece 35A is indicated by adding the capital letter "A" to the numeral. The configuration of side piece 35B corresponding to side piece 35A is indicated by adding the capital letter "B" to the same numeral as side piece 35A. This avoids redundant explanation. For example, a main body portion 38A of side piece 35A, which will be described later, and a main body portion 38B of side piece 35B have the same configuration.

[0037] 4, the side piece 35A is provided on a first outer edge 32a1, which is one of a pair of first outer edges 32a of the intermediate flat piece 32. The side piece 35A includes 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 a first direction in the circumferential direction of the curved pipe portion 13. The first tongue portion 39A extends from the outer edge of the main body portion 38A on the first receiving port 11 side (see FIG. 1). The first tongue portion 39A is connected to the first flat piece 33 by a first adhesive tape (first attaching member) 43. The outer edge of the first tongue portion 39A (side piece 35A) on the first flat piece 33 side is connected to the outer edge of the first flat piece 33 on the first tongue portion 39A side. In other words, the outer edge of the first tongue portion 39A on the first flat piece 33 side and the outer edge of the first flat piece 33 on the first tongue portion 39A side are connected to each other in a butted relationship. The second tongue portion 40A extends from the outer edge of the main body portion 38A on the second receiving port 12 side (see FIG. 1). The second tongue portion 40A is connected to the second flat piece 34 by a first adhesive tape 43 (see FIG. 4). At this time, the outer edge of the second tongue portion 40A (side piece 35A) on the second flat piece 34 side is connected to the outer edge of the second 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.

[0038] The side pieces 35A, 35B are wrapped around the entire outer surface of the curved pipe portion 13 together with the intermediate flat piece 32 and connected to each other by a second adhesive tape (second attaching member) 44. For example, the second adhesive tape 44 is attached along the second central axis O2. In the first sound-insulating cover 31, the first flat piece 33 and the side pieces 35A, 35B form a first opening 31a into which the end of the curved pipe section 13 on the first socket 11 side is disposed. The second flat piece 34 and the side pieces 35A, 35B form a second opening 31b into which the second socket 12 of the fitting 10 (the end of the curved pipe section 13 on the second socket 12 side) is disposed. 1, the end of the first sound-insulating cover 31 on the first socket 11 side and the first socket 11 are connected to each other by adhesive tape 45. The adhesive tape 45 is wrapped around the entire periphery of the first socket 11.

[0039] The thickness of the first sound insulating cover 31 is preferably about 1 mm to 5 mm, and more preferably about 2 mm. The surface density of the first sound insulating cover 31 is 1 kg / m 2 ~8kg / m 2 It is preferable that the 2 It is more preferable that the degree of The first sound-insulating cover 31 is formed from an elastic resin material such as an olefin-based material (a resin composition containing 300 to 300 parts by mass of inorganic filler per 100 parts by mass of olefin-based resin).

[0040] 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.

[0041] 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 31 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 31 will buckle when flattened. 2 ~3000kg / cm 2 If so, the strength and winding processability are sufficient. The first sound-insulating cover 31 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). The first sound-insulating cover 31 is made of a harder material than the sound-absorbing cover 21, and therefore the first sound-insulating cover 31 needs to be formed in the unfolded shape of the first sound-insulating sheet 31A.

[0042] The first sound-insulating sheet 31A is used to cover the outer surface of the joint 10. 5, in the first sound insulation sheet 31A, the first flat piece 33 extends from the second outer edge 32b1 toward the opposite side to the intermediate flat piece 32. The second flat piece 34 extends from the second outer edge 32b2 toward the opposite side to 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 portion 38A extends from the first outer edge 32a1 toward the opposite side from the intermediate flat piece 32 along the second outer edge 32b. The first tongue portion 39A extends from the outer edge of the main body portion 38A on the first flat piece 33 side (the first socket 11 side) toward the opposite side of the main body portion 38A. The width of the first tongue portion 39A (the length 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 second flat piece 34 side (the second socket 12 side) 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 in plan view.

[0043] The distance between the first flat piece 33 and the first tongue portion 39A of the side piece 35A gradually increases as the flat piece 33 moves away from the intermediate flat piece 32. That is, the notch 46A formed between the first flat piece 33 and the first tongue portion 39A is formed in a V-shape that opens in a direction away from the intermediate flat piece 32. Similarly, the distance between the second flat piece 34 and the second tongue portion 40A of the side piece 35A gradually increases with increasing distance from the intermediate flat piece 32. That is, the notch 47A formed between the second flat piece 34 and the second tongue portion 40A is formed in a V-shape that opens in a direction away from the intermediate flat piece 32.

[0044] 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 includes a main body portion 38B, a first tongue portion 39B, and a second tongue portion 40B that are configured similarly to the main body portion 38A, the first tongue portion 39A, and the second tongue portion 40A of the side piece 35A.

[0045] The second sound-insulating cover 56 is formed in a cylindrical shape. The second sound-insulating cover 56 covers the outer surface of the second connection portion 12 of the joint 10 via the sound-absorbing cover 21. The second sound-insulating cover 56 is disposed so as to be displaced in a direction along the second central axis O2 relative to the first sound-insulating cover 31. In other words, the end of the first sound-insulating cover 31 on the side of the second connection portion 12 and the second sound-insulating cover 56 are disposed side by side and butt-jointed in a direction along the second central axis O2. 1, the first sound insulating cover 31 and the second sound insulating cover 56 are connected to each other by an adhesive tape 45. The adhesive tape 45 is wrapped around the entire periphery of the second sound insulating cover 56. The second sound-insulating cover 56 and the foam tape 26 are connected to each other by an adhesive tape 45. The adhesive tape 45 is wrapped around the entire circumference of the foam tape 26.

[0046] The second sound insulating cover 56 is unfolded to form a second sound insulating sheet 56A, which is formed in a strip shape as shown in FIG. The second sound-insulating cover 56 can be made of the same material as the first sound-insulating cover 31 .

[0047] Next, a procedure for constructing the joint structure 1 configured as above will be described. Below, a procedure for covering a single joint 10, to which the connecting pipe 124 and the horizontal pipe 113 are not connected, with the sound-insulating member 20 will be described. Note that a description of the procedure for attaching the adhesive tapes 43, 44, etc. will be omitted. 7, foam tape 26 is wrapped around the end of second socket 12 of joint 10 opposite curved pipe portion 13 in advance. Foam tape 26 is used to provide a step in second socket 12 for sound-absorbing cover 21.

[0048] Large-sized resin joints are adhesively joined using a joint fixing jig called a Lever Block (registered trademark). When the sound-insulating member 20 is held by the joint fixing jig, the first sound-insulating cover 31 may be dented or damaged. Therefore, as shown in FIG. 8 , a rib 130 may be provided on the outer surface of the curved pipe portion 13, i.e., the surface of the curved pipe portion 13 that is covered by the sound-absorbing cover 21. The rib 130 is a plate-shaped member provided along the outer surface of the curved pipe portion 13 from the boundary between the first socket 11 and the curved pipe portion 13 to the boundary between the second socket 12 and the curved pipe portion 13. The rib 130 is provided between the curved pipe portion 13 and the first sound-insulating cover 31 or the second sound-insulating cover 56. This prevents pressure from the joint fixing jig from being applied to the first sound-insulating cover 31. The rib 130 is provided at least above the second center axis O2 of the second socket 12 of the horizontal pipe connection portion 117.

[0049] 8, it is preferable that there is no step between the outer surface 11a of the first socket 11 and the outer surface 130a of the rib 130, that is, that the outer surface 11a of the first socket 11 and the outer surface 130a of the rib 130 are flush with each other. This prevents the sound-absorbing cover from being deformed and pressure from being applied to the first sound-insulating cover 31 due to pressure applied to the first socket 11 or the outer surface 130a of the rib 130 by the joint fixing jig. Note that if there is sufficient space between the outer surface 11a of the first receiving port 11 and the outer surface of the curved pipe portion 13, and if the deformation of the sound-absorbing cover 21 can be suppressed by the rib 130, there may be a step between the outer surface 11a of the first receiving port 11 and the outer surface 130a of the rib 130. This allows the fitting 10 to fit well within the piping space even when the curved pipe portion 13 is covered with the sound-absorbing cover 21 or the sound-insulating sheet 31, making installation using a fitting fixing jig easier.

[0050] As shown in FIG. 9 , the rib 130 preferably has a shape that protrudes away from the curved pipe portion 13 along the first central axis O1 of the first socket 11, i.e., a shape that increases in thickness relative to the outer surface of the curved pipe portion 13, with increasing distance from the boundary between the first socket 11 and the curved pipe portion 13. Furthermore, the rib 130 preferably has a shape that protrudes away from the curved pipe portion 13 along the second central axis O2 of the second socket 12, i.e., a shape that increases in thickness relative to the outer surface of the curved pipe portion 13, with increasing distance from the boundary between the second socket 12 and the curved pipe portion 13. As shown in FIG. 9 , the rib 130 has a portion 131 that is parallel to the first central axis O1 of the first socket 11 and a portion 132 that is parallel to the second central axis O2 of the second socket 12. The portion 131 that is parallel to the first central axis O1 of the first socket 11 and the portion 132 that is parallel to the second central axis O2 of the second socket 12 may not be present.

[0051] As shown in Fig. 10, the rib 130 may have a retaining portion 133 provided in a portion 131 parallel to the first central axis O1 of the first socket 11, from or near the boundary between the first socket 11 and the second socket 12. The retaining portion 133 may be a recess recessed toward the curved pipe portion 13 as shown in Fig. 10, or a protrusion protruding on the side opposite the curved pipe portion 13. The rib 130 may also have a structure similar to the retaining portion 133 in a portion 132 parallel to the second central axis O2 of the second socket 12. This makes it possible to hold the sound-insulating sheet 31 and prevent the sound-absorbing cover 21 from being dented when the joint 10 is placed on the floor.

[0052] Next, as shown in FIG. 11, a sound absorbing sheet 21A is wrapped around the outer surface of the joint 10, and the outer surface of the joint 10 is covered with a sound absorbing cover 21. In addition, when ribs 130 are provided on the outer surface of the curved pipe section 13 as shown in Figures 8 to 10, a sound-absorbing sheet 21A is wrapped around the outer surfaces of the joint 10 and the ribs 130, and the outer surface of the joint 10 is covered with a sound-absorbing cover 21, as shown in Figure 12.

[0053] 13, the first sound-insulating sheet 31A and the second sound-insulating sheet 56A are wrapped around the outer surfaces of the joint 10 and the sound-absorbing cover 21, respectively, to cover the outer surfaces of the joint 10 and the sound-absorbing cover 21 with the first sound-insulating cover 31 and the second sound-insulating cover 56. At this time, the second sound-insulating cover 56 is supported by the foam tape 26. In addition, as shown in Figures 8 to 10, when ribs 130 are provided on the outer surface of the curved pipe section 13, as shown in Figure 14, a first sound-insulating sheet 31A and a second sound-insulating sheet 56A are wrapped around the outer surfaces of the joint 10, the sound-absorbing cover 21 and the ribs 130, and the outer surfaces of the joint 10, the sound-absorbing cover 21 and the ribs 130 are covered with the first sound-insulating cover 31 and the second sound-insulating cover 56.

[0054] As described above, according to the first sound-insulating cover 31 of this embodiment, the side pieces 35A, 35B are connected to each other by the second adhesive tape 44, and therefore the side pieces 35A, 35B, together with the intermediate flat piece 32, are wrapped around the entire outer surface of the curved pipe portion 13. The first flat piece 33 and the side pieces 35A, 35B cover the entire circumference of the end of the curved pipe portion 13 facing the first socket 11, and the second flat piece 34 and the side pieces 35A, 35B cover the entire circumference of the end of the curved pipe portion 13 facing the second socket 12. In this manner, the first sound-insulating cover 31 is attached to the joint 10. At this time, the second adhesive tape 44 is attached, for example, along the second central axis O2 to connect the side pieces 35A and 35B to each other. Also, the first adhesive tape 43 is attached, for example, along the first central axis O1 and the second central axis O2 to connect the first flat piece 33 and the second flat piece 34 to the side pieces 35A and 35B. Therefore, when attaching the first sound-insulating cover 31 to the joint 10, the adhesive tapes 43, 44 do not need to be wound around the circumferential direction of the curved pipe portion 13, which facilitates the work of attaching the adhesive tapes 43, 44. This improves the workability when attaching the first sound-insulating cover 31 to the joint 10.

[0055] The outer edge of side piece 35A on the first flat piece 33 side is connected to the outer edge of first flat piece 33 on the side piece 35A side. This reduces the overlapping portion between first flat piece 33 and side piece 35A, making it possible to prevent first sound-insulating cover 31 from becoming thicker. Side piece 35A includes a main body 38A, a first tongue portion 39A, and a second tongue portion 40A. Therefore, first adhesive tape 43 can connect first tongue portion 39A to first flat piece 33, and can also connect second tongue portion 40A to second flat piece 34.

[0056] Furthermore, according to the first sound-insulating sheet 31A of this embodiment, with the pair of first outer edges 32a of the intermediate flat piece 32 positioned so that they are each aligned along the reference plane S1, the intermediate flat piece 32 is brought into contact with the outer surface of the convex side of the curved pipe section 13 via the sound-absorbing cover 21. The pair of second outer edges 32b are folded, and the first flat piece 33 is positioned so that it extends along the first central axis O1, and the second flat piece 34 is positioned so that it extends along the second central axis O2. The side pieces 35A, 35B are wrapped around the entire outer surface of the curved pipe portion 13 together with the intermediate flat piece 32, and the side pieces 35A, 35B are connected to each other with the second adhesive tape 44. At this time, the second adhesive tape 44 is attached, for example, along the second central axis O2. For example, the first adhesive tape 43 is attached along the first central axis O1 and the second central axis O2 to connect the first flat piece 33 and the second flat piece 34 to the side pieces 35A and 35B, respectively. Through the above steps, the first sound-insulating sheet 31A is attached to the joint 10 to form the first sound-insulating cover 31. Therefore, when attaching the first sound-insulating sheet 31A to the joint 10, the attachment members 43, 44 do not need to be attached in a wrapping manner around the circumferential direction of the curved pipe portion 13, which facilitates the attachment of the attachment members 43, 44. This improves the workability of attaching the first sound-insulating sheet 31A to the joint 10.

[0057] The distance between the first flat piece 33 and the side piece 35A gradually increases as it moves away from the intermediate flat piece 32. As a result, when the outer edge of the first flat piece 33 and the outer edge of the side piece 35A are connected with the first adhesive tape 43 and the first flat piece 33 is arranged to extend along the first central axis O1, the overlapping portion between the first flat piece 33 and the side piece 35A is reduced, and an increase in thickness of the first sound insulation sheet 31A can be prevented. The sound-insulating member 20 of this embodiment includes a sound-absorbing cover 21 and a first sound-insulating cover 31. Therefore, the sound-insulating member 20 can be configured using the first sound-insulating cover 31 and the sound-absorbing cover 21, which improve the ease of attachment to the joint 10.

[0058] The sound-insulating member 20 includes a second sound-insulating cover 56. Therefore, the second sound-insulating cover 56 can be used to cover the outer surface of the second socket 12 of the joint 10 more reliably. Moreover, the joint structure 1 of this embodiment includes the sound-insulating member 20 and the joint 10. This allows the joint structure 1 to be configured using the first sound-insulating cover 31, which improves the workability of attaching it to the joint 10.

[0059] Although one embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and configuration changes, combinations, deletions, etc. are also included within the scope that does not deviate from the gist of the present invention. For example, in the above embodiment, the outer edge of the first tongue portion 39A on the first flat piece 33 side may not be connected to the outer edge of the first flat piece 33 on the first tongue portion 39A side, and for example, in a plan view, the center of the first tongue portion 39A may be connected to the center of the first flat piece 33. In this case, in the first sound insulation sheet, the distance between the first flat piece 33 and the first tongue portion 39A may not gradually increase as it moves away from the intermediate flat piece 32. The sound-insulating member 20 does not necessarily have to include the second sound-insulating cover 56 .

[0060] The joint 10 does not have to include the legs 14. In this case, the through-hole 32c is not formed in the first sound-insulating cover. Although the first and second connection portions are described as being sockets 11 and 12, the first and second connection portions are not limited to being sockets, and may be spigots, flanges, or the like. [Explanation of symbols]

[0061] 1 Joint structure 10 Joints 11 First socket (first connection part) 12 Second socket (second connection part) 13 Bent pipe section 20 Sound-insulating materials 21 Sound-absorbing cover 31 No. 1 sound insulation cover (sound insulation cover) 31A No. 1 sound insulation sheet (sound insulation sheet) 32 Intermediate flat piece 32a, 32a1, 32a2 First outer edge 32b, 32b1, 32b2 Second outer edge 33 1st flat piece 34 Second flat piece 35A,35B side piece 38A, 38B Main body 39A,39B 1st tongue 40A, 40B Second tongue 43 First adhesive tape (first joining member) 44 Second adhesive tape (second attachment member) 56 Second sound insulation cover 130 Ribs O1 1st central axis O2 2nd central axis S1 reference plane

Claims

1. A joint structure including: a first connection portion; a second connection portion having a second central axis intersecting a first central axis of the first connection portion; curved pipe portions connected to the first connection portion and the second connection portion, the curved pipe portions being longer in the second central axis direction than in the first central axis direction; a first sound-insulating cover covering at least an outer surface of the curved pipe portion; and a second sound-insulating cover covering an outer surface of the second connection portion, the first sound-insulating cover is inclined with respect to the first central axis and the second central axis and has a rectangular plane when viewed from the first central axis and the second central axis, the rectangular plane is located opposite the first central axis and opposite the second central axis, A joint structure in which the end of the first sound-insulating cover on the second connection portion side and the second sound-insulating cover are connected with adhesive tape.

2. a foam tape covering an outer surface of an end of the second connection portion; 2. The joint structure according to claim 1, wherein the end of the second sound-insulating cover and the foam tape are connected by another adhesive tape.

3. The joint structure according to claim 1 or 2, wherein a space is provided between the inner surface of the rectangular flat surface and the outer surface of the curved pipe portion.

4. A joint used in the joint structure according to any one of claims 1 to 3, a first connection portion to which a lower end of a vertical pipe or a manifold extending in the vertical direction is connected; a second connection portion having a second central axis that intersects with the first central axis of the first connection portion; a curved pipe portion connected to the first connection portion and the second connection portion, the curved pipe portion being longer in the second central axis direction than in the first central axis direction; Equipped with A joint comprising a rib provided on the outer surface of the connection portion between the second connection portion and the curved pipe portion, below the second central axis.

5. The joint according to claim 4 , wherein the rib has a recess or a protrusion recessed toward the curved pipe portion.

6. 6. The joint according to claim 4, wherein a plurality of the ribs are provided.

7. A manifold system comprising a vertical pipe, a manifold connected to the lower end of the vertical pipe, a joint structure described in any one of claims 1 to 3 connected to the lower end of the manifold, and a horizontal pipe connected to the joint structure.

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