Joint structures and buildings

Abstract

To provide a joint structure that suppresses peeling of an adhesive tape connecting seams of a sound insulating member due to a temperature change during storage.SOLUTION: A joint structure 1 comprises: a resin joint 10; and a sound insulating member 20 that covers an outer surface of the joint 10. The sound insulating member 20 has an inner layer as a sound absorbing layer, and an outer layer as a sound insulating layer. An adhesive tape 45 connecting seams of the sound insulating member 20 has a base material made of a resin foam, and an adhesive layer provided on one main surface of the base material.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] Conventionally, as buildings become more multi-functional and complex, there has been an increasing number of cases where improvement in the sound insulation performance of piping systems including drain pipes is required. For example, in improving the sound insulation performance of drain pipes, it is effective to impart sufficient sound insulation to the bent portions of the drain pipes, such as the legs of the vertical pipes where the generated sound is large.

[0003] However, joints having a curved pipe portion including a leg joint are formed with a plurality of shapes including a curved surface on the outer surface being related to each other, and are more complex than straight pipes. For this reason, manufacturing a joint provided with a sound insulation cover has many production and design problems, and it is not easy to improve the sound insulation performance of the joint.

[0004] Therefore, for example, a technique of covering the outer peripheral portion of a heat-expandable refractory material layer in a resin pipe joint with a sound insulation and vibration prevention sheet is disclosed (see, for example, Patent Document 1). This sound insulation and vibration prevention sheet has a multi-layer structure having an inorganic fiber layer on the inner layer and modified asphalt on the outer layer.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] A sound insulation cover having a soft sound absorption material (fiber, foam) as an inner layer is difficult to wrap along the shape of the leg joint. Therefore, an adhesive tape is used to connect the joints of the sound insulation cover. However, due to temperature changes during storage, the tensile load of the adhesive tape changes, and the adhesive tape may peel off. If the adhesive tape peels off, the sound insulation cover may fall off.

[0007] The present invention has been made in view of such problems, and an object thereof is to provide a joint structure that suppresses peeling of an adhesive tape that connects joints of a sound insulation member due to temperature changes during storage.

Means for Solving the Problems

[0008] In order to solve the above problems, the present invention proposes the following means. [1] A joint structure including a resin joint and a sound insulation member that covers the outer surface of the joint, wherein the sound insulation member has a sound absorption layer as an inner layer and a sound insulation layer as an outer layer, and the adhesive tape that connects the joints of the sound insulation member has a base material made of a resin foam and an adhesive layer provided on one main surface of the base material.

Effects of the Invention

[0009] According to the present invention, it is possible to provide a joint structure that suppresses peeling of an adhesive tape that connects joints of a sound insulation member due to temperature changes during storage.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0011] Hereinafter, an embodiment of the joint structure according to the present invention will be described with reference to FIGS. 1 to 9. As shown in FIG. 1, the joint structure 1 of the present embodiment is used, for example, in the collective joint system 110 in the building 100. In FIG. 1, the collective sound insulation member 119 and the adhesive tape 120, which will be described later, are shown through and hatched. The side pieces 35A and the 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 the slab through-hole 101a formed in the floor slab 101 of the building 100. The collective joint system 110 includes a collective joint 111, a vertical pipe 112, a horizontal pipe 113, and a joint structure 1.

[0012] The collective joint 111 includes a joint body 116 and a horizontal pipe connection portion 117 fixed to the joint body 116. The joint body 116 is formed in a cylindrical shape and is arranged such that the axis of the joint body 116 extends along the vertical direction. Here, the fact that the axis and the vertical direction are along means that the acute angle formed by the axis and the vertical direction is 30 degrees or less, or the axis and the vertical direction are parallel. This acute angle is more preferably 20 degrees or less. When the axis and the vertical direction do not intersect, the axis or the like is extended by a tangent line to obtain the formed acute angle. The arrangement relationship along the outer edges and the cover element and the axis (direction) is the same.

[0013] The upper end portion of the joint body 116 is a vertical pipe connection portion 116a, and the lower end portion of the joint body 116 is a vertical pipe connection portion 116b. The horizontal pipe connection portions 117 are fixed to the outer peripheral surface of the upper part of the joint body 116. A plurality of the horizontal pipe connection portions 117 are arranged at intervals around the axis of the joint body 116. The outer surface of the joint body 116 is covered with an assembly sound insulation member 119. The assembly sound insulation member 119 includes a first assembly sound absorption cover that covers the outer surface of the joint body 116 and a second assembly sound insulation cover (these reference numerals are omitted) that covers the outer surface of the first assembly sound absorption cover. The materials of the first assembly sound absorption cover and the second assembly sound insulation cover are the same as the materials of the sound absorption cover 21 and the first sound insulation cover 31 described later. The assembly sound insulation member 119 is attached to the joint body 116 by an adhesive tape 120.

[0014] The portion of the joint body 116 below the plurality of horizontal pipe connection portions 117 is disposed in the slab through-hole 101a of the floor slab 101. That is, the plurality of 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 peripheral edge portion of the slab through-hole 101a in the floor slab 101 and the assembly sound insulation member 119.

[0015] The vertical pipe 112 is disposed such that the axis of the vertical pipe 112 extends in the vertical direction. The lower end portion of the vertical pipe 112 is connected to the vertical pipe connection portion 116a of the joint body 116. The end portion of the horizontal pipe 113 is connected to the horizontal pipe connection portion 117 of the assembly joint 111. The horizontal pipe 113 is disposed so as to gradually incline upward as it separates from the assembly joint 111 and has a water gradient.

[0016] The joint structure 1 includes a joint 10 and a sound insulation 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 portion 14. The second receiving port 12 has a second central axis O2 that intersects the first central axis O1 of the first receiving port 11. Here, the plane including the first central axis O1 and the second central axis O2 is defined as the reference plane S1. The curved pipe portion 13 is formed in a curved tubular shape and is connected to the first receiving port 11 and the second receiving port 12, respectively. On the reference plane S1, the central angle with respect to the central axis of the curved pipe portion 13 (the angle at which the curved pipe portion 13 curves) is approximately 90 degrees. The leg portion 14 is formed in a cylindrical shape in this example. The leg portion 14 is arranged such that the axis of the leg portion 14 is along the first central axis O1 of the first receiving port 11. The first end of the leg portion 14 is fixed to the outer peripheral surface on the convex side of the curved pipe portion 13 where the curved pipe portion 13 curves to be convex. The joint 10 is arranged such that the first central axis O1 of the first receiving port 11 is along the vertical direction. The first receiving port 11 and the vertical pipe connection portion 116b of the collective joint 111 are connected by a connecting pipe 124. The end of the horizontal pipe 113 is connected to the second receiving port 12.

[0017] The sound insulation member 20 includes a sound absorption cover 21, a first sound insulation cover (sound insulation cover) 31, and a second sound insulation cover 56. Hereinafter, the configurations of the sound absorption cover 21, the first sound insulation cover 31, and the second sound insulation cover 56 will be described with reference to the drawings. However, the directions in which the sound absorption cover 21, the first sound insulation cover 31, and the second sound insulation cover 56 are used are not limited to the directions shown in the drawings.

[0018] The sound absorption cover 21 covers the outer surfaces of the curved pipe portion 13 of the joint 10 and the like. Fig. 2 shows a perspective view of the sound absorption cover 21, and Fig. 3 shows a plan view of the sound absorption sheet 21A obtained by unfolding the sound absorption cover 21. In the following figures from Fig. 2, the portions connected to each other in each cover or sheet are shown with the same type of hatching. When the planar (flat) sound absorption sheet 21A is bent and connected with an adhesive tape or the like, a three-dimensional sound absorption cover 21 is formed. As shown in Figs. 2 and 3, the sound absorption cover 21 (sound absorption sheet 21A) includes 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 and is long in a predetermined direction when unfolded. In the sound-absorbing cover 21, both outer edges 22a along the short side direction of the strip-shaped piece 22 are connected to each other by an adhesive tape (not shown), and the strip-shaped piece 22 is formed in a cylindrical shape. In the sound-absorbing cover 21, a first opening 21a is formed by one outer edge 22b along the longitudinal direction of the strip-shaped piece 22, and the second receiving port 12 of the joint 10 is disposed inside. The first tongue piece 23 and the second tongue piece 24 are disposed on the other outer edge 22c along the longitudinal direction of the strip-shaped piece 22. The first tongue piece 23 and the second tongue piece 24 extend toward the side opposite to the strip-shaped piece 22 in the unfolded state. The first tongue piece 23 and the second tongue piece 24 gradually become narrower as they extend toward the tip side extending from the strip-shaped piece 22. The first tongue piece 23 and the second tongue piece 24 are formed in a triangular shape in plan view in the unfolded state. The first tongue piece 23 and the second tongue piece 24 are arranged side by side along the outer edge 22c of the strip-shaped piece 22.

[0020] Here, in the sound-absorbing cover 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 cover 21, portions other than the ends on the strip-shaped piece 22 side of the outer edges 23a and 24a are connected to each other by an 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, and the leg body 14 of the joint 10 is disposed inside. In the sound-absorbing cover 21, a third opening 21c is formed by the outer edges on the outer sides of the first tongue piece 23 and the second tongue piece 24, and the end portion on the first receiving port 11 side of the bent pipe portion 13 is disposed inside. The end surfaces of the outer edges 23a and 24a of the sound-absorbing cover 21 abut against the side surfaces of the rib 130 described later. As shown in FIG. 1, when there are a plurality of ribs 130, notches or slits for the ribs 130 to penetrate may be provided in the sound-absorbing cover 21.

[0021] The sound-absorbing cover 21 is formed of, for example, needle felt. For example, the needle felt contains 40% to 50% polyethylene terephthalate, 35% to 45% acrylic fiber, and 10% to 20% wool rayon. When manufacturing the needle felt, needles with barbs are pierced into the needle felt to mechanically entangle the fibers. Note that the sound-absorbing cover 21 may be formed of felt such as thermal felt or PET felt, or an acrylic fiber mixture. The density of the sound-absorbing cover 21 is preferably 80 kg / m 3 or more. The thickness of the sound-absorbing cover 21 is preferably about 10 mm. Since the sound-absorbing cover 21 is formed of a softer material than the first sound-insulating cover 31, the sound-absorbing cover 21 can be formed from a deployed shape such as the sound-absorbing sheet 21A.

[0022] As shown in FIG. 1, it is preferable that the sound-insulating member 20 includes a foam tape 26 that covers the outer surface of the second receiving port 12 of the joint 10. The foam tape 26 is disposed on the side opposite to the bent pipe portion 13 with respect to the sound-absorbing cover 21. The foam tape 26 preferably has the same thickness as the sound-absorbing cover 21 and is harder than the sound-absorbing cover 21. The surface density of the sound-absorbing cover 21 is preferably about 1.0 kg / m 2 or so.

[0023] As shown in FIG. 1, the first sound-insulating cover 31 covers the outer surfaces of the sound-absorbing cover 21 and the foam tape 26. That is, 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 obtained by unfolding the first sound-insulating cover 31. In FIG. 4, the first adhesive tape 43 and the second adhesive tape 44 are shown by a two-dot chain line. When the planar (flat) first sound-insulating sheet 31A is bent and connected with an adhesive tape, the three-dimensional first sound-insulating cover 31 is configured. As shown in FIGS. 4 and 5, the first sound insulation cover 31 (first sound insulation sheet 31A) includes an intermediate flat piece 32, a first flat piece 33, a second flat piece 34, and a pair of side pieces 35A and 35B.

[0024] The intermediate flat piece 32 is flat. By "flat" here, for example, in a cross-section by the reference plane S1, both surfaces on both sides in the thickness direction of the intermediate flat piece 32 mean that the ratio of the length in the thickness direction between the most convex part and the most concave part on this surface to the length in the longitudinal direction of the surface is within 10%. This ratio is more preferably 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. By "rectangular shape" here, for example, the ratio of the length of one of the pair of first outer edges 32a described later to the length of the other is within 30%, 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 within 30%. This ratio is more preferably within 20%.

[0025] Here, as shown in FIGS. 4 and 5, in the rectangular intermediate flat piece 32, there are two pairs of outer edges arranged along each other. Among 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 is an outer edge 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 with the central portion of the intermediate flat piece 32 interposed therebetween. The first outer edge 32a and the second outer edge 32b are arranged continuously with each other. As shown in FIG. 1, the intermediate flat piece 32 is arranged such that the pair of first outer edges 32a are respectively 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 side of the first receiving port 11 is also referred to as the second outer edge 32b1. Of the pair of second outer edges 32b, the second outer edge 32b located on the side of the second receiving port 12 is also referred to as the second outer edge 32b2.

[0026] As shown in FIG. 4, a through hole 32c is formed at the end of the intermediate flat piece 32 on the side of the second outer edge 32b2, into which the leg 14 of the joint 10 is disposed inside. The intermediate flat piece 32 is flat in a state where the first sound insulation sheet 31A is bent to form the first sound insulation cover 31. As shown in FIG. 1, the intermediate flat piece 32 is in contact with the outer surface on the convex side of the curved pipe portion 13 via the sound absorption cover 21. The intermediate flat piece 32 is inclined so as to gradually approach the second receiving port 12 as it moves away from the first receiving port 11 along the first central axis O1.

[0027] 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 in the direction along the second outer edge 32b) gradually becomes narrower 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 becomes narrower 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). The first flat piece 33 and the second flat piece 34 are preferably flat in a state where the first sound insulation sheet 31A is bent to form the first sound insulation cover 31.

[0028] In the present embodiment, the configuration of the side piece 35A and the configuration of the side piece 35B are symmetric with respect to the reference plane S1. For this reason, the configuration of the side piece 35A is indicated by adding the English capital letter "A" to the number. The configuration corresponding to the side piece 35A in the side piece 35B is indicated by adding the English capital letter "B" to the same number as the side piece 35A. This omits overlapping explanations. For example, the main body portion 38A of the side piece 35A to be described later and the main body portion 38B of the side piece 35B have the same configuration as each other.

[0029] As shown in FIG. 4, 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 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 along the first circumferential direction of the bent pipe portion 13 from the first outer edge 32a1. The first tongue portion 39A extends from the outer edge of the main body portion 38A on the side of the first receiving port 11 (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 side of the first flat piece 33 is connected to the outer edge of the first flat piece 33 on the side of the first tongue portion 39A. That is, the outer edge of the first tongue portion 39A on the side of the first flat piece 33 and the outer edge of the first flat piece 33 on the side of the first tongue portion 39A are connected to each other in a butted state. The second tongue portion 40A extends from the outer edge of the main body portion 38A on the side of the second receiving port 12 (see FIG. 1). The second tongue portion 40A is connected to the second flat piece 34 by the first adhesive tape 43 (see FIG. 4). At this time, the outer edge of the second tongue portion 40A (side piece 35A) on the side of the second flat piece 34 is connected to the outer edge of the second flat piece 34 on the side of the second tongue portion 40A. For example, the first adhesive tape 43 is attached along the first central axis O1 and the second central axis O2.

[0030] The side pieces 35A and 35B are connected to each other by a second adhesive tape (second attaching member) 44 in a state of being wound around the outer surface of the bent pipe portion 13 over the entire circumference together with the intermediate flat piece 32. For example, the second adhesive tape 44 is attached along the second central axis O2. In the first sound insulation cover 31, a first opening 31a is formed by the first flat piece 33 and the side pieces 35A and 35B, in which the end portion of the bent pipe portion 13 on the side of the first receiving port 11 is disposed inside. A second opening 31b is formed by the second flat piece 34 and the side pieces 35A and 35B, in which the second receiving port 12 of the joint 10 (the end portion of the bent pipe portion 13 on the side of the second receiving port 12) is disposed inside. As shown in FIG. 1, the end portion of the first sound insulation cover 31 on the side of the first receiving port 11 and the first receiving port 11 are connected to each other by an adhesive tape 45. The adhesive tape 45 is wound around the entire circumference of the first receiving port 11.

[0031] The thickness of the first sound insulation cover 31 is preferably about 1 mm to 5 mm, more preferably about 2 mm. Further, the surface density of the first sound insulation cover 31 is preferably 2 ~8 kg / m 2 and more preferably about 3.4 kg / m 2 . The first sound insulation cover 31 is formed of a resin material having elasticity, such as an olefin-based material (a resin composition containing 300 to

[0032] The inorganic filler is not particularly limited, and 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, dawsonite, 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. 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.

[0033] 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, and poly-α-olefin can be mentioned. Among them, polyethylene with a density of 0.87 g / cm 3 ~0.93 g / cm 3 is preferred as the olefin resin. If the density is less than 0.87 g / cm 3 , the strength of the first sound insulation cover 31 is not sufficient. If it exceeds 0.93 g / cm 3 , when the first sound insulation cover 31 is flattened, the first sound insulation cover 31 may buckle. 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 sound insulation cover 31 may be formed of a material different from the olefin-based material. For example, an elastomer material such as a polyvinyl chloride-based resin, a polystyrene resin, an ABS resin, an AS resin, or a thermoplastic elastomer (TPE) may be used. Since the first sound insulation cover 31 is formed of a harder material than the sound absorption cover 21, it is necessary to form the first sound insulation cover 31 from a developed shape such as the first sound insulation sheet 31A.

[0034] The first sound insulation sheet 31A is used to cover the outer surface of the joint 10. As shown in FIG. 5, in the first sound insulation sheet 31A, the first flat piece 33 extends from the second outer edge 32b1 toward the side opposite to the intermediate flat piece 32. The second flat piece 34 extends from the second outer edge 32b2 toward the side opposite to the intermediate flat piece 32. The side piece 35A is provided on the first outer edge 32a1 and extends toward the side opposite to the intermediate flat piece 32. The main body portion 38A extends from the first outer edge 32a1 along the second outer edge 32b toward the side opposite to the intermediate flat piece 32. The first tongue portion 39A extends from the outer edge of the main body portion 38A on the first flat piece 33 side (first socket 11 side) toward the opposite side to the main body portion 38A. The width of the first tongue portion 39A (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 (second socket 12 side) toward the opposite side to 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 a plan view.

[0035] The distance between the first flat piece 33 and the first tongue portion 39A of the side piece 35A gradually increases with increasing distance 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.

[0036] Side piece 35B is provided on first outer edge 32a2 and extends toward the opposite side from intermediate flat piece 32. Side piece 35B includes main body portion 38B, first tongue portion 39B, and second tongue portion 40B that are configured similarly to main body portion 38A, first tongue portion 39A, and second tongue portion 40A of side piece 35A.

[0037] 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 shifted in position relative to the first sound-insulating cover 31 in the direction along the second central axis O2. That is, the end portion of the first sound insulating cover 31 on the second connecting portion 12 side and the second sound insulating cover 56 are arranged side by side in a state of butting against each other in the direction along the second central axis O2. As shown in Fig. 1, the first sound insulation cover 31 and the second sound insulation cover 56 are connected to each other by an adhesive tape 45. The adhesive tape 45 is wound around the entire circumference of the second sound insulation cover 56. The second sound insulation cover 56 and the foaming tape 26 are connected to each other by an adhesive tape 45. The adhesive tape 45 is wound around the entire circumference of the foaming tape 26.

[0038] The second sound insulation sheet 56A obtained by unfolding the second sound insulation cover 56 is formed in a strip shape as shown in Fig. 6. The second sound insulation cover 56 can be formed of the same material as the first sound insulation cover 31.

[0039] The adhesive tape 45 has a base material made of a resin foam and an adhesive layer provided on one main surface of the base material.

[0040] The width of the adhesive tape 45 is preferably 20 mm or more and 60 mm or less, and more preferably 30 mm or more and 50 mm or less. If the width of the adhesive tape 45 is 20 mm or more, it is possible to suppress a change in the tensile load of the adhesive tape 45 due to a temperature change during storage. On the other hand, if the width of the adhesive tape 45 is 60 mm or less, it is possible to prevent the tape from shifting due to the load applied to the sound insulation cover during construction.

[0041] The thickness of the adhesive tape 45 is preferably 0.15 mm or more and 2.0 mm or less, more preferably 0.2 mm or more and 1.5 mm or less, and most preferably 0.2 mm or more and 0.8 mm or less. If the thickness of the adhesive tape 45 is 0.15 mm or more, it is possible to suppress a change in the tensile load of the adhesive tape 45 due to a temperature change during storage. On the other hand, if the thickness of the adhesive tape 45 is 2.0 mm or less, less force is required when winding the adhesive tape 45.

[0042] The tensile load of the adhesive tape 45 is preferably 10 N or more and 45 N or less, and more preferably 20 N or more and 40 N or less. If the tensile load of the adhesive tape 45 is 10 N or more, wrinkles are less likely to occur and breakage is less likely to occur when the adhesive tape 45 is wound. On the other hand, if the tensile load of the adhesive tape 45 is 45 N or less, it is possible to suppress a change in the tensile load of the adhesive tape 45 due to a temperature change during storage.

[0043] The tensile load of the adhesive tape 45 can be measured by a method conforming to JIS Z 0237(2009) under the condition of 23°C.

[0044] The difference in the tensile load of the adhesive tape 45 during temperature change, specifically, the absolute value of the difference between the tensile load at 0°C and the tensile load at 45°C is preferably 60 N or less, and more preferably 40 N or less. If the difference in the tensile load of the adhesive tape 45 during temperature change is 60 N or less, it is possible to suppress a change in the tensile load of the adhesive tape 45 due to a temperature change during storage.

[0045] The adhesive force of the adhesive tape 45 is preferably 10 N or more, and more preferably 30 N or more. If the adhesive force of the adhesive tape 45 is 10 N or more, it is possible to suppress a change in the tensile load of the adhesive tape 45 due to a temperature change during storage.

[0046] The adhesive force of the adhesive tape can be measured by a method conforming to JIS Z 0237(2009) under the condition of 23°C.

[0047] The thickness of the base material (resin foam) is preferably 100 μm or more and 1500 μm or less, and more preferably 600 μm or more and 1000 μm or less. If the thickness of the base material (resin foam) is 100 μm or more, it is not easily broken when wound around the sound insulation cover. On the other hand, if the thickness of the base material (resin foam) is 1300 μm or less, it easily follows the step of the sound insulation cover and is not easily wrinkled.

[0048] The thickness of the adhesive layer is preferably 50 μm or more and 200 μm or less, and more preferably 100 μm or more and 150 μm or less. If the thickness of the adhesive layer is 50 μm or more, peeling of the adhesive tape 45 due to temperature changes during storage can be prevented. On the other hand, if the thickness of the adhesive layer is 200 μm or less, cohesive failure of the adhesive layer can be prevented.

[0049] The expansion ratio of the base material (resin foam) is preferably 2 times or more and 10 times or less, and more preferably 4 times or more and 9 times or less. If the expansion ratio of the base material (resin foam) is equal to or higher than the above lower limit value, changes in the tensile load of the adhesive tape 45 due to temperature changes during storage can be suppressed. On the other hand, if the expansion ratio of the base material (resin foam) is equal to or lower than the above upper limit value, it is less likely to break when wound around the sound insulation cover.

[0050] The expansion ratio of the base material (resin foam) can be calculated, for example, by dividing the specific gravity of the resin in the foamed state by the specific gravity of the resin constituting the unfoamed foam. The specific gravity can be calculated by cutting the base material (resin foam) into a certain size and dividing the mass (measured with an electronic balance, etc.) by the volume (calculated by measuring the dimensions in the thickness, width, and length directions with calipers).

[0051] Examples of the material of the foam include polyethylene, polypropylene, urethane, rubber, etc.

[0052] Examples of the material of the adhesive layer include acrylic adhesives and rubber adhesives.

[0053] Next, the procedure for constructing the joint structure 1 configured as described above will be explained. Hereinafter, the procedure for covering the single joint 10, where the connecting pipe 124 and the horizontal pipe 113 are not connected, with the sound insulation member 20 will be explained. Note that the procedure for attaching the adhesive tapes 43, 44, etc. will be omitted from the description. As shown in FIG. 7, the foam tape 26 is wound in advance around the end of the second receiving port 12 of the joint 10 on the side opposite to the bent pipe portion 13. The foam tape 26 is for providing a step for the sound absorption cover 21 in the second receiving port 12. Next, as shown in FIG. 8, a sound-absorbing sheet 21A is wound around the outer surface of the joint 10, and the outer surface of the joint 10 is covered with a sound-absorbing cover 21. Next, as shown in FIG. 9, a first sound-insulating sheet 31A and a second sound-insulating sheet 56A are wound around the outer surfaces of the joint 10 and the sound-absorbing cover 21, and the outer surfaces of the joint 10 and the sound-absorbing cover 21 are covered with a first sound-insulating cover 31 and a second sound-insulating cover 56. At this time, the second sound-insulating cover 56 is supported by a foamed tape 26.

[0054] As described above, according to the joint structure 1 of the present embodiment, it includes a resin joint 10 and a sound-insulating member 20 that covers the outer surface of the joint 10. The sound-insulating member 20 has a sound-absorbing layer (sound-absorbing cover 21) as the inner layer and a sound-insulating layer (first sound-insulating cover 31, second sound-insulating cover 56) as the outer layer. The adhesive tape 45 that connects the joints of the sound-insulating member 20 has a base material made of a resin foam and an adhesive layer provided on one main surface of the base material. Therefore, it is possible to suppress the peeling of the adhesive tape 45 due to temperature changes during storage. That is, since the adhesive tape 45 has a base material made of a resin foam, when the temperature changes, the pores of the resin foam can be deformed to suppress the expansion or contraction of the resin foam. Thereby, it is possible to suppress the adhesive tape 45 from expanding or contracting and peeling due to temperature changes.

[0055] As described above, although one embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and it also includes configuration changes, combinations, deletions, etc. 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 side of the first flat piece 33 is not connected to the outer edge of the first flat piece 33 on the side of the first tongue portion 39A. For example, the central portion of the first tongue portion 39A and the central portion of the first flat piece 33 may be connected in a plan view. In this case, in the first sound-insulating sheet, the distance between the first flat piece 33 and the first tongue portion 39A does not have to gradually increase as it separates from the intermediate flat piece 32. The sound-insulating member 20 does not have to include the second sound-insulating cover 56.

[0056] The joint 10 may not be provided with the leg body 14. In this case, the through hole 32c is not formed in the first sound insulation cover. Although the first connecting portion and the second connecting portion are the sockets 11 and 12, the first connecting portion and the second connecting portion are not limited to the sockets, and may be plugs, flanges, or the like.

Embodiment

[0057] Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.

[0058] [Example 1] As shown in FIG. 1, the first sound insulation cover 31 and the second sound insulation cover 56 were connected to each other by an adhesive tape 45. The adhesive tape 45 was wound around the entire circumference of the second sound insulation cover 56. Further, the second sound insulation cover 56 and the foam tape 26 were connected to each other by the adhesive tape 45. The adhesive tape 45 was wound around the entire circumference of the foam tape 26. As the adhesive tape, one having a base material made of foamed polyethylene and an adhesive layer made of an acrylic resin was used. The thickness of the adhesive tape was 0.8 mm and the width was 25 mm.

[0059] "Measurement of Tensile Load of Adhesive Tape" The tensile load of the adhesive tape was measured by a method conforming to JIS Z 0237 (2009) under the condition of 23°C. The results are shown in Table 1.

[0060] "Measurement of Difference in Tensile Load of Adhesive Tape at Temperature Change" The tensile loads of the adhesive tape at 0°C and 45°C were measured by a method conforming to JIS Z 0237. From the obtained results, the absolute value of the difference between the tensile load at 0°C and the tensile load at 45°C was calculated. The results are shown in Table 1.

[0061] "Measurement of Adhesive Force of Adhesive Tape" The adhesive force of the adhesive tape was measured by a method conforming to JIS Z 0237 (2009) under the condition of 23°C. The results are shown in Table 1.

[0062] "Heat Resistance Evaluation of Adhesive Tape" The heat resistance test of the adhesive tape wound as described above was carried out. The adhesive tape was alternately exposed to an atmosphere of 0°C for 2 hours and an atmosphere of 45°C for 2 hours, and this was repeated 50 times. Whether the adhesive tape peeled off or not was visually observed. The case where it did not peel off was evaluated as "○", and the case where it peeled off was evaluated as "×". The results are shown in Table 1.

[0063] [Example 2] The adhesive tape was wound in the same manner as in Example 1, except that the width of the adhesive tape was 50 mm. In the same manner as in Example 1, the tensile load of the adhesive tape was measured, the difference in the tensile load of the adhesive tape when the temperature changed was measured, the adhesive force of the adhesive tape was measured, and the heat resistance evaluation of the adhesive tape was performed. The results are shown in Table 1.

[0064] [Example 3] The adhesive tape was wound in the same manner as in Example 1, except that the width of the adhesive tape was 60 mm. In the same manner as in Example 1, the tensile load of the adhesive tape was measured, the difference in the tensile load of the adhesive tape when the temperature changed was measured, the adhesive force of the adhesive tape was measured, and the heat resistance evaluation of the adhesive tape was performed. The results are shown in Table 1.

[0065] [Comparative Example] The adhesive tape was wound in the same manner as in Example 1, except that the following was used for adhesion. As the adhesive tape, one with a base material of soft polyvinyl chloride and an adhesive layer composed of rubber was used. The thickness of the adhesive tape was 0.4 mm and the width was 25 mm. In the same manner as in Example 1, the tensile load of the adhesive tape was measured, the difference in the tensile load of the adhesive tape when the temperature changed was measured, the adhesive force of the adhesive tape was measured, and the heat resistance evaluation of the adhesive tape was performed. The results are shown in Table 1.

[0066]

Table 1

[0067] From the results of Table 1, in Example 1 and Example 2, the difference in the tensile load of the adhesive tape when the temperature changes is small, and it was found that the adhesive tape is difficult to peel off due to the temperature change.

Explanation of Signs

[0068] 1 Joint structure 10 Joint 11 First receiving port (first connection part) 12 Second receiving port (second connection part) 13 Curved pipe part 20 Sound insulation member 21 Sound absorption cover 31 First sound insulation cover (sound insulation cover) 31A First sound insulation sheet (sound insulation sheet) 32 Intermediate flat piece 32a, 32a1, 32a2 First outer edge 32b, 32b1, 32b2 Second outer edge 33 First flat piece 34 Second flat piece 35A, 35B Side piece 38A, 38B Main body part 39A, 39B First tongue part 40A, 40B Second tongue part 43 First adhesive tape (first attaching member) 44 Second adhesive tape (second attaching member) 45 Adhesive tape 56 Second sound insulation cover 130 Rib O1 First central axis O2 Second central axis S1 Reference plane

Claims

1. A joint structure comprising a resin joint, a sound-insulating member covering an outer surface of the joint, and a plurality of adhesive tapes, The sound-insulating member has an inner layer that is a sound absorbing layer and an outer layer that is a sound-insulating layer, the sound-insulating member includes an optional sound-insulating member and another optional sound-insulating member adjacent to the optional sound-insulating member and disposed downstream of the joint; The adhesive tape has a base material made of a resin foam and an adhesive layer provided on one main surface of the base material, A joint structure in which some of the adhesive tapes connect the upstream end of the arbitrary sound-insulating member to the outer surface of the joint, and other parts of the adhesive tapes connect the arbitrary sound-insulating member to the other arbitrary sound-insulating member.

2. The joint is disposed in a slab penetration hole formed in a floor slab of a building, The joint includes a joint body, a horizontal pipe connection portion disposed on the outer peripheral surface of the joint body, and a vertical pipe connection portion disposed on the upper end of the joint body. The joint structure according to claim 1 , wherein the part of the adhesive tape connects an upstream end of the arbitrary sound-insulating member to an outer surface of the vertical pipe connecting portion.

3. A connecting pipe is provided at the lower end of the joint and connected to a leg joint having a curved pipe portion. The joint structure according to claim 2.

4. The joint is arranged between a collective joint or a vertical pipe arranged in a through hole of a floor slab of a building and a horizontal pipe arranged under the floor slab, The joint has a first connection portion connected to the lower end of the manifold or the vertical pipe, a second connection portion connected to the horizontal pipe, and a curved pipe portion between the first connection portion and the second connection portion, The joint structure according to claim 1 , wherein the part of the adhesive tape connects an upstream end of the arbitrary sound-insulating member to an outer surface of the first connecting portion.

5. A joint structure as described in claim 4, wherein a space is provided between the sound-absorbing layer and the sound-insulating layer.

6. A joint structure described in any one of claims 1 to 5, wherein the thickness of the adhesive tape is 0.15 mm or more and 2.0 mm or less.

7. A joint structure described in any one of claims 1 to 6, wherein the width of the adhesive tape is 20 mm or more and 60 mm or less.

8. A building having a joint structure described in any one of claims 1 to 7.

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