JP2019183423A - Piping structure - Google Patents

Abstract

To provide a piping structure that can reliably suppress the generation of abnormal noise through the floor slab of a building structure to be constructed.SOLUTION: A piping structure 1 comprises: a collective joint 10 having a vertical pipe connecting portion 13 connectable to a vertical pipe P1, and a horizontal pipe connecting portion protruding from a side surface of the vertical pipe connecting portion 13 and capable of connecting a horizontal pipe P3; and a sound insulation cover 20 having a sound absorbing layer 21 covering the vertical pipe connecting portion 13, and a sound insulating layer 22 covering the sound absorbing layer 21. A lower portion of the collective joint 10 is provided in a floor slab 50 of the building structure, and the lower end of the sound insulation cover 20 is disposed between the upper surface and the lower surface of the floor slab 50.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a piping structure.

Conventionally, for example, piping structures as shown in Patent Document 1 and Patent Document 2 below are known. In these piping structures, the sound insulation cover covers the collective joint. The collective joint includes a vertical pipe connecting portion that can be connected to the vertical pipe, and a horizontal pipe connecting portion that protrudes from a side surface of the vertical pipe connecting portion and can connect the horizontal pipe.
The sound insulation cover described in Patent Document 1 exhibits a three-dimensional shape that matches the shape of the collective joint. The sound insulation cover has elasticity and is attached to the collective joint while being deformed.
The sound insulation cover described in Patent Document 2 has a planar shape. The sound insulation cover is formed with a through hole into which the horizontal pipe connecting portion is inserted, and is wound around and attached to the collective joint.

JP, 2006-0050444, A JP 2010-236688 A

  In the conventional piping structure, for example, a portion of the collective joint where the sound insulation cover is not attached may be embedded in a floor slab of a building structure. In such a case, the drainage flowing down inside the collective joint collides with the collective joint to generate vibration, and this vibration is transmitted to the floor slab, which may cause abnormal noise.

  This invention is made in view of the situation mentioned above, Comprising: It aims at providing the piping structure which can suppress reliably that abnormal noise arises through the floor slab of the building structure to be constructed. And

In order to solve the above problems, the present invention proposes the following means.
The piping structure according to the present invention is a collective joint having a vertical pipe connecting portion connectable to a vertical pipe, and a horizontal pipe connecting portion projecting from a side surface of the vertical pipe connecting portion and capable of connecting a horizontal pipe, A sound insulation cover having a sound absorbing layer covering the longitudinal pipe connecting portion and a sound insulating layer covering the sound absorbing layer, and a lower part of the collective joint is in a floor slab of a building structure It is embedded and the lower end part of the said sound-insulation cover is arrange | positioned between the upper surface and lower surface of the said floor slab, It is characterized by the above-mentioned.

  According to this invention, the collective joint is inserted into a through-hole formed in the floor slab, and the lower part of the collective joint is embedded in the floor slab. And the lower end part of the sound-insulation cover which covers a collective joint is arrange | positioned between the upper surface and lower surface of a floor slab. For this reason, a sound-insulating cover can be interposed between the outer peripheral surface of the collective joint and the opening peripheral edge of the through hole in the upper surface of the floor slab.

  Thereby, it is possible to block the vibration from the collective joint from being transmitted to the upper surface of the floor slab where the vibration from the collective joint is remarkably transmitted by the sound absorbing layer and the sound insulating layer of the sound insulation cover. In this way, it is possible to reliably suppress the generation of abnormal noise through the floor slab of the building structure to be constructed.

Moreover, a foamed tape may be affixed to the lower end of the sound insulation cover over the entire circumference.
In this case, since the foam tape is affixed to the lower end of the sound insulation cover over the entire circumference, the foam tape can absorb the leakage of sound from the lower end edge of the sound insulation cover to the outside.

  Further, at least a portion of the collective joint embedded in the floor slab may be a thermal expansion pipe.

  In this case, since the portion embedded in the floor slab of the collective joint is a thermal expansion pipe, the thermal expansion pipe will expand if there is a temperature rise due to a fire or the like downstairs of the floor slab. Therefore, it is possible to prevent the heat from the lower floor from being transmitted to the upper floor of the floor slab.

  At this time, since the lower end portion of the sound insulation cover is disposed between the upper surface and the lower surface of the floor slab, the sound insulation cover is temporarily disposed at the step formed around the through hole of the floor slab. In other words, the sound insulation cover is engaged with the step portion of the floor slab in the vertical direction. For this reason, it is possible to prevent the collective joint from falling off due to its own weight from the through hole in the floor slab deteriorated due to the temperature rise, by the sound insulating cover being caught by the step portion of the floor slab.

Moreover, a thermally expansible sheet may be affixed to the outer peripheral surface of at least one of the collective joint and the sound insulation cover.
In this case, since the thermally expandable sheet is affixed to the outer peripheral surface of at least one of the collective joint and the sound insulation cover over the entire circumference, the thermally expandable sheet expands, so that the floor slab Heat from the lower floor can be prevented from being transmitted to the upper floor.

  At this time, since the lower end portion of the sound insulation cover is disposed between the upper surface and the lower surface of the floor slab, the sound insulation cover is temporarily disposed at the step formed around the through hole of the floor slab. In other words, the sound insulation cover is engaged with the step portion of the floor slab in the vertical direction. For this reason, it is possible to prevent the collective joint from falling off due to its own weight from the through hole in the floor slab that has deteriorated due to the temperature rise, by the sound insulating cover being caught by the step portion of the floor slab.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress reliably that abnormal noise arises through the floor slab of the construction building to be constructed.

It is a front view of the collective joint in the piping structure concerning a 1st embodiment of the present invention. It is a partial cross section front view which shows the piping structure which concerns on 1st Embodiment of this invention. FIG. 3 is a plan view of the sound absorbing sheet shown in FIG. 2. It is a top view of the sound insulation sheet 22 shown in FIG. It is a rear view which shows the state which bonded together the edge parts of the sound-absorbing sheet shown in FIG. 2 with the adhesive tape. It is a partial cross section front view which shows the piping structure which concerns on 2nd Embodiment of this invention. It is a partial cross section front view which shows the modification of the piping structure shown in FIG. It is a partial cross section front view which shows the piping structure which concerns on 3rd Embodiment of this invention. It is a partial cross section front view which shows the modification of the piping structure shown in FIG.

(First embodiment)
Hereinafter, the piping structure 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5.
As shown in FIGS. 1 and 2, the piping structure 1 according to the present embodiment includes a collective joint (collective pipe joint) 10 and a sound insulating cover 20 that covers the collective joint.
The collective joint 10 includes an upper connecting pipe 11 and a lower connecting pipe 12 connected to the upper connecting pipe 11. The upper connecting pipe 11 includes a vertical pipe connecting part 13 that can be connected to the first vertical pipe P1, and a horizontal pipe connecting part 14 that protrudes from the side surface of the vertical pipe connecting part 13 and can connect the horizontal pipe P3. Have. The first vertical pipe P <b> 1 is connected to the upper end portion of the upper connection pipe 11.

  In the following description, the direction along the central axis O of the vertical pipe connecting portion 13 is referred to as the axial direction, the upper connecting pipe 11 side of the vertical pipe connecting portion 13 along the axial direction is referred to as the upper side, and the lower connecting pipe 12 side is referred to as the lower side. A direction orthogonal to the central axis O in a plan view viewed from the axial direction is referred to as a radial direction, and a direction around the central axis O in a plan view viewed from the axial direction is referred to as a circumferential direction.

A plurality of ribs 19 projecting outward in the radial direction are formed at the upper end of the vertical pipe connecting portion 13. In the illustrated example, three ribs 19 are arranged at intervals in the axial direction, and four sets of ribs 19 are arranged at intervals in the circumferential direction.
The four sets of ribs 19 are arranged at equal intervals. The size of the rib 19 in the radial direction is smaller than the thickness in the radial direction of a sound insulating sheet 22 to be described later.
When constructing the collective joint 10 on a building structure, a support fitting (not shown) is held by coming into contact with the rib 19 from the outside in the radial direction.

The horizontal tube connecting portion 14 extends from the peripheral wall of the vertical tube connecting portion 13 toward the outside in the radial direction. In the illustrated example, three horizontal pipe connecting portions 14 are arranged.
Two of the three horizontal pipe connecting portions 14 are separately arranged at positions that sandwich the central axis O in the radial direction. The remaining horizontal tube connecting portions 14 extend in the radial direction in the direction in which each of the two horizontal tube connecting portions 14 extends and in a direction forming 90 ° in a top view. In addition, it is not restricted to such an aspect, The quantity of the horizontal pipe connection part 14 and the extending direction can be changed arbitrarily.
As shown in FIG. 1, a connection ring 15 to which the horizontal pipe P <b> 3 is connected separately is attached to an outer end portion in the radial direction of the horizontal pipe connection portion 14. The outer diameter of the connecting ring 15 is larger than the outer diameter of the horizontal tube connecting portion 14.

  The upper connecting pipe 11 and the lower connecting pipe 12 in the collective joint 10 may be transparent. Thereby, the connection state of the upper connection pipe 11 and the lower connection pipe 12 can be visually recognized. Moreover, you may mix | blend flame retardants, such as non-thermally expanded graphite and magnesium hydroxide.

  The lower connecting pipe 12 has a tubular shape in which the diameter of the lower connection pipe is reduced from the upper part. The lower connecting pipe 12 is located at the upper end, is connected to the lower side of the upper connecting pipe 11, and is connected to the lower side of the connecting pipe part 16, and gradually decreases in diameter toward the lower side. A pipe 17 and a lower pipe 18 connected to the lower end of the inclined pipe 17 and to the second vertical pipe P2 are provided. The connecting tube portion 16, the inclined tube portion 17, and the lower tube portion 18 are integrally formed, for example, by injection molding of a synthetic resin material.

  The outer diameter of the connecting pipe portion 16 is equal to the outer diameter of the vertical pipe connecting portion 13 in the upper connecting pipe 11. The outer diameter at the lower end of the inclined pipe part 17 is smaller than the outer diameter of the connecting pipe part 16. The size of the inclined pipe portion 17 in the axial direction is larger than the size of the connecting pipe portion 16 in the axial direction.

The connecting pipe portion 16 contains a resin composition containing a polyvinyl chloride resin and thermally expandable graphite. That is, the connecting pipe part 16 is produced by molding a resin composition. Usually, the connecting pipe part 16 is produced by extruding a resin composition.
The connecting pipe part 16 may have a single layer structure in which the entire connecting pipe part 16 is made of a resin composition, or may be a multilayer structure having a plurality of layers. In the case of a multilayer structure, any layer may be formed from the resin composition. For example, when the connecting pipe portion 16 has a three-layer structure including a surface layer, an intermediate layer, and an inner layer, the intermediate layer may be formed from a resin composition, and the surface layer, the intermediate layer, and the inner layer may have the endothermic properties. An agent may be contained.

The intermediate layer has a black color because it contains thermally expandable graphite. Therefore, it is preferable that the surface layer and the inner layer contain a colorant other than black so that they can be distinguished from the intermediate layer.
The thickness of the surface layer and the inner layer is preferably from 0.3 mm to 3.0 mm, and more preferably from 0.6 mm to 1.5 mm. If the thickness of the coating layer is 0.3 mm or more, sufficient mechanical strength as a tube can be ensured, and if it is 3.0 mm or less, a decrease in fire resistance can be suppressed.
Moreover, it is preferable that the connecting pipe part 16 satisfies the performance described in JIS K6741.

  The outer diameter of the lower pipe portion 18 is smaller than the outer diameter of the connection pipe portion 16 and larger than the outer diameter of the lower end portion of the inclined pipe portion 17. The size of the lower pipe portion 18 in the axial direction is smaller than the size of the connecting pipe portion 16 in the axial direction. The second vertical pipe P <b> 2 is connected to the lower connection pipe 12 by fitting the second vertical pipe P <b> 2 from below into the inside of the lower pipe portion 18.

  As shown in FIG. 2, the sound insulation cover 20 according to this embodiment includes a sound absorbing sheet (sound absorbing layer) 21 wound around the upper connecting pipe 11 from the outside in the radial direction and covering the vertical pipe connecting portion 13, and a sound absorbing sheet. Sound insulation sheet 22 (sound insulation layer) 22 covering 21. Each of the sound absorbing sheet 21 and the sound insulating sheet 22 has flexibility.

The sound absorbing sheet 21 has a rectangular shape before being wound around the vertical pipe connecting portion 13. The sound absorbing sheet 21 has a rectangular shape that is longer in the horizontal direction (longer side direction) than in the vertical direction when viewed from the front. The sound absorbing sheet 21 is attached to the upper connecting pipe 11 so that the vertical direction coincides with the axial direction of the collective joint 10.
The sound absorbing sheet 21 is formed with a first fitting port 24 into which the horizontal tube connecting portion 14 is fitted. In the illustrated example, three first fitting ports 24 are arranged at intervals in the lateral direction.

The first fitting port 24 has an elliptical shape in a front view, the major axis direction coincides with the vertical direction, and the minor axis direction coincides with the horizontal direction.
And the 2nd fitting port 25 is expanded by the horizontal direction by the horizontal pipe connection part 14 being penetrated, and exhibits a perfect circle shape. The shape of the second fitting port 25 is not limited to such an aspect, and may be, for example, an oval shape or a rhombus shape.

  The sound absorbing sheet 21 is formed with a window 21 </ b> A in which the rib 19 of the vertical pipe connecting portion 13 is disposed inside. A plurality of windows 21A are arranged at intervals in the horizontal direction. In the illustrated example, two windows 21A are arranged. The window 21A has a rectangular shape that is longer in the horizontal direction than in the vertical direction when viewed from the front. The windows 21 </ b> A are separately disposed in portions of the sound absorbing sheet 21 that are located above the second fitting ports 25.

The sound absorbing sheet 21 is also formed with an opening 21 </ b> B in which the rib 19 of the vertical pipe connecting portion 13 is disposed inside. A pair of openings 21 </ b> B are disposed at both ends in the lateral direction of the sound absorbing sheet 21. The pair of openings 21B opens toward the outside in the vertical direction.
The opening 21B has a rectangular shape that is longer in the horizontal direction than in the vertical direction when viewed from the front. The vertical position of the opening 21B coincides with the vertical position of the window 21A. The pair of windows 21 </ b> A is provided with ribs 19 on the inner side in a state where both ends of the sound absorbing sheet 21 are overlapped.

The sound absorbing sheet 21 is formed in a sheet shape from a fiber material. As a material of the sound absorbing sheet 21, for example, felt, glass wool, rock wool or the like can be employed. The thickness of the sound absorbing sheet 21 is 1 to 20 mm and the surface density is 0.1 to ² kg / m ² .
Note that the material of the sound absorbing sheet 21 may not be a fiber material, and may be a porous material such as urethane foam, polyethylene foam, and polypropylene as long as the thickness and surface density are within the above ranges.

As shown in FIG. 4, the sound insulation sheet 22 has a rectangular strip shape that is longer in the horizontal direction (longer side direction) than in the vertical direction when viewed from the front. The sound insulation sheet 22 is attached to the upper connecting pipe 11 so that the vertical direction coincides with the axial direction of the collective joint 10.
The sound insulation sheet 22 is formed with a second fitting port 25 into which the horizontal pipe connecting portion 14 is fitted. In the illustrated example, three second fitting ports 25 are arranged at intervals in the lateral direction.

The second fitting port 25 has an elliptical shape in a front view, the major axis direction coincides with the vertical direction, and the minor axis direction coincides with the horizontal direction.
And the 2nd fitting port 25 is expanded by the horizontal direction by the horizontal pipe connection part 14 being penetrated, and exhibits a perfect circle shape. The shape of the second fitting port 25 is not limited to such an aspect, and may be, for example, an oval shape or a rhombus shape.

  In the sound insulating sheet 22, a pair of notches 22A having a triangular shape in front view are formed at both longitudinal edges. Two pairs of the notches 22A are arranged at intervals in the lateral direction. The notch 22A is used for alignment when the both ends of the sound insulating sheet 22 in the lateral direction are overlapped. The shape of the notch 22A is not limited to a triangular shape, and can be arbitrarily changed.

  When the sound insulation sheet 22 is wound around the outside of the sound absorbing sheet 21 in the radial direction, the horizontal pipe connecting portion 14 is inserted into the second fitting opening 25 while elastically deforming the sound insulation sheet 22 so that the second fitting opening 25 is expanded. And fitted. For this reason, due to the elastic restoring force of the sound insulating sheet 22, the inner peripheral edge portion of the second fitting port 25 is in close contact with the outer peripheral surface of the horizontal pipe connecting portion 14.

Both end portions of the sound insulation sheet 22 in the horizontal direction are connected to each other at a portion of the side surface of the vertical tube connecting portion 13 where the horizontal tube connecting portion 14 is not projected.
As shown in FIG. 5, both ends in the horizontal direction of the sound insulating sheet 22 are fixed by the adhesive tape 40 in a state of being overlapped with each other in the radial direction so that two sets of cutouts 22 </ b> A overlap each other. In the illustrated example, the lateral size of the adhesive tape 40 is equal to the lateral spacing between the two sets of openings 21B.

As the adhesive tape 40, for example, a butyl rubber tape having adhesiveness and water-stopping property can be used.
Note that both ends of the sound insulating sheet 22 may be connected to each other by an adhesive instead of the adhesive tape 40. Moreover, you may connect so that attachment or detachment is possible by the fastener provided in both ends, a hook-and-loop fastener, etc.

The sound insulating sheet 22 is formed of a resin composition containing 300 to 3000 parts by weight of an inorganic filler with respect to 100 parts by weight of the base resin. As the base resin, an olefin resin can be adopted. The sound insulating sheet 22 has a thickness of 1 to 5 mm and an area density of 1 to 8 kg / m ² .
The base resin of the sound insulation sheet 22 is not limited to the olefin resin, and may be a material having elasticity such as modified asphalt, elastomer, rubber, polyolefin resin, soft vinyl chloride resin, or the like.

  Examples of the inorganic filler 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, base Magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, barium carbonate, dawnite, hydrotalcite, calcium sulfate, barium sulfate, gypsum fiber, calcium silicate, talc, clay, mica, montmorillonite, bentonite, activated clay, sepiolite , Imogolite, sericite, glass fiber, glass beads, silica balun, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balun, charcoal powder, various metal powders, titanate carbonate Um, 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. From the balance of cost, it is preferable to use calcium carbonate and barium sulfate. These may be used alone or in combination of two or more.

The sound insulating sheet 22 has flexibility. The tensile elastic modulus of the sound insulating sheet 22 is preferably 5 to 500 kg / cm ² . This is because it is easy to wind around the collective joint 10. About 100 kg / cm ² is not too soft and not too hard and is easy to wind.
In addition, you may laminate | stack surface materials, such as a synthetic fiber nonwoven fabric and a glass fiber nonwoven fabric, on the single side | surface or both surfaces of the sound insulation sheet 22. FIG.

And in this embodiment, the lower part of the collective joint 10 is embed | buried in the floor slab 50 of a building structure. A through hole 51 is formed in the floor slab 50.
The lower part of the collective joint 10 is inserted into the through hole 51 of the floor slab 50. Of the inner peripheral surface of the through hole 51, a step portion 52 that protrudes inward in the radial direction is formed in a portion located on the lower side.
The step portion 52 is formed in a cylindrical shape and is arranged coaxially with the through hole 51. On the stepped portion 52, a mounting surface 52A facing upward is formed.

The lower end portion of the sound insulating cover 20 is disposed between the upper surface 50A and the lower surface 50B of the floor slab 50. The lower end of the sound insulation cover 20 is placed on the placement surface 52 </ b> A of the stepped portion 52 in the through hole 51.
The inner diameter of the through hole 51 is larger than the outer diameter of the sound insulation cover 20. The inner diameter of the stepped portion 52 of the through hole 51 is larger than the outer diameter of the connecting pipe portion 16 in the lower connecting pipe 12 of the collective joint 10 facing in the radial direction.

In the present embodiment, at least a portion of the collective joint 10 embedded in the floor slab 50 is a thermal expansion pipe. In the illustrated example, the connecting pipe portion 16 of the lower connecting pipe 12 is a thermal expansion pipe.
The thermal expansion tube expands and expands its diameter by being heated, for example, when a fire is generated downstairs of the floor slab 50. Thereby, the outer peripheral surface of the connecting pipe part 16 contacts the inner peripheral surface of the step part 52 in the through hole 51 in the floor slab 50. In this way, the flame and heat generated by the fire are blocked without being transmitted to the floor above the floor slab 50.

Here, transmission of vibration from the piping structure to the floor slab 50 will be described.
When drainage flows down into the collective joint 10, the collective joint 10 vibrates due to the drainage colliding with the inner surface of the collective joint 10. This vibration may be transmitted from the outer peripheral surface of the collective joint 10 to the floor slab 50 through the inner peripheral surface of the through hole 51.

Here, generally, the vibration transmitted from the through hole 51 of the floor slab 50 to the inner peripheral surface is remarkably transmitted on the upper surface 50A and the lower surface 50B of the floor slab 50. This is because the vibration energy is biased toward the surface, so that the attenuation is small and the amplitude is large.
For this reason, in the piping structure 1 of the present embodiment, the lower end portion of the sound insulating cover 20 is disposed in the stepped portion 52, so that the outer peripheral surface of the collective joint 10 and the opening peripheral portion of the through hole 51 in the upper surface 50A of the floor slab 50 The sound insulation cover 20 is interposed between the two.

  As described above, according to the piping structure according to the present embodiment, the collective joint 10 is inserted into the through hole 51 formed in the floor slab 50, and the lower part of the collective joint 10 is embedded in the floor slab 50. ing. And the lower end part of the sound insulation cover 20 which covers the collective joint 10 is arrange | positioned between the upper surface 50A and the lower surface 50B of the floor slab 50. FIG. For this reason, the sound insulation cover 20 can be interposed between the outer peripheral surface of the collective joint 10 and the opening peripheral edge of the through hole 51 of the collective joint 10 on the upper surface 50 </ b> A of the floor slab 50.

  Thereby, the vibration from the collective joint 10 is blocked by the sound absorbing sheet 21 and the sound insulating sheet 22 of the sound insulating cover 20 on the upper surface 50A of the floor slab 50 where the vibration from the collective joint 10 is easily transmitted. Is possible. In this way, it is possible to reliably suppress the generation of abnormal noise through the floor slab 50 of the building structure to be constructed.

  Moreover, since the part embed | buried in the floor slab 50 among the joint joints 10 is a thermal expansion pipe, when there exists a temperature rise by the fire etc. downstairs of the floor slab 50, a thermal expansion pipe expands. Thus, it is possible to prevent the heat from the lower floor from being transmitted to the upper floor of the floor slab 50.

  At this time, since the lower end portion of the sound insulation cover 20 is disposed between the upper surface 50A and the lower surface 50B of the floor slab 50, that is, in the step portion 52 formed around the through hole 51 of the floor slab 50, the sound insulation The cover 20 is engaged with the step portion 52 of the floor slab 50 in the vertical direction. For this reason, it is possible to prevent the collective joint 10 from falling off due to its own weight from the through-hole 51 of the collective joint 10 in the floor slab 50 that has deteriorated due to the temperature rise, by the sound insulating cover 20 being caught by the step 52 of the floor slab 50. .

Next, the piping structure 2 according to the second embodiment of the present embodiment will be described with reference to FIGS. 6 and 7. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
As shown in FIG. 6, a foam tape 30 is attached to the lower end of the sound insulation cover 20 over the entire circumference.

  The foam tape 30 has a thin film shape. The foam tape 30 is affixed across the outer peripheral surface of the collective joint 10 and the outer peripheral surface of the sound insulating sheet 22. For this reason, the foamed tape 30 closes the lower end edges of the sound absorbing sheet 21 and the sound insulating sheet 22.

The foamed tape 31 may have a radial thickness as in the piping structure 2B according to the modification shown in FIG. The foamed tape 31 according to the present modification has a predetermined thickness in the radial direction, and is disposed on a portion of the outer peripheral surface of the collective joint 10 that is continuous with the lower side of the sound absorbing sheet 21.
The radial thickness of the foamed tape 31 is equal to the radial thickness of the sound absorbing sheet 21. An adhesive seal 33 is applied across the outer peripheral surface of the foamed tape 31 and the outer peripheral surface of the sound insulating sheet 22.

Next, the piping structure 3 according to the third embodiment of the present embodiment will be described with reference to FIGS. 8 and 9. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
As shown in FIG. 8, a thermally expandable sheet 32 is affixed to the outer peripheral surface of at least one of the collective joint 10 and the sound insulation cover 20 over the entire circumference. In the illustrated example, a thermally expandable sheet 32 is affixed to the outer peripheral surface of the collective joint 10.

The thermally expandable sheet 32 is stuck between the upper connecting pipe 11 and the lower connecting pipe. The sound absorbing sheet 21 is wound from the outside in the radial direction on the upper portion of the thermally expandable sheet 32.
The heat-expandable sheet 32 expands and expands its diameter by being heated, for example, when a fire occurs on the floor of the floor slab 50. Thereby, the sound insulation cover 20 located on the outer side in the radial direction of the thermally expandable sheet 32 comes into contact with the inner peripheral surface of the through hole 51 in the floor slab 50. In this way, the flame and heat generated by the fire are blocked without being transmitted to the floor above the floor slab 50.

  Note that the thermally expandable sheet 32 may be affixed to the outer peripheral surface of the sound insulating cover 20 as in a piping structure 3B according to a modification shown in FIG. In this case, the diameter of the sound insulating cover 20 is increased by heat, so that the outer peripheral surface of the sound insulating cover 20 and the inner peripheral surface of the through hole 51 come into contact with each other. Thereby, the flame and heat which generate | occur | produced by the fire are interrupted | blocked, without transmitting to the upper floor of the floor slab 50. FIG.

  As described above, according to the piping structures 3 and 3B according to the present embodiment, the thermally expandable sheet 32 is attached to the outer peripheral surface of at least one of the collective joint 10 and the sound insulating cover 20 over the entire circumference. Has been. For this reason, it can prevent that the heat from a lower floor is transmitted to the upper floor of the floor slab 50 because the thermally expansible sheet 32 expands.

At this time, the lower end portion of the sound insulating cover 20 is disposed between the upper surface 50A and the lower surface 50B of the floor slab 50. For this reason, if the sound insulation cover 20 is disposed in the step portion 52 formed around the through hole 51 of the floor slab 50, the sound insulation cover 20 is engaged with the step portion 52 of the floor slab 50 in the vertical direction. Will be doing.
Therefore, when the sound insulation cover 20 is hooked on the step portion 52 of the floor slab 50, it is possible to prevent the collective joint 10 from coming off due to its own weight from the through hole 51 of the collective joint 10 in the floor slab 50 deteriorated due to temperature rise.

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

  For example, in each of the above-described embodiments, the sound insulation cover 20 has a configuration in which it has a rectangular strip shape that is longer in the horizontal direction than in the vertical direction when viewed from the front, but is not limited to such a mode. The front view shape of the sound insulation cover 20 can be arbitrarily changed.

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

1, 2, 3 Piping structure 10 Collective joint 20 Sound insulation cover 21 Sound absorbing sheet (sound absorbing layer)
22 Sound insulation sheet (sound insulation layer)
30 Foam tape 31 Foam tape 32 Thermally expandable sheet

Claims (4)

A collective joint having a vertical pipe connecting portion connectable to the vertical pipe, and a horizontal pipe connecting portion protruding from a side surface of the vertical pipe connecting portion and capable of connecting the horizontal pipe;
A sound insulation cover having a sound absorbing layer that covers the longitudinal pipe connecting portion and a sound insulating layer that covers the sound absorbing layer, and a pipe structure comprising:
The lower part of the collective joint is embedded in a floor slab of a building structure,
A piping structure, wherein a lower end portion of the sound insulation cover is disposed between an upper surface and a lower surface of the floor slab.   The piping structure according to claim 1, wherein foamed tape is attached to the lower end of the sound insulation cover over the entire circumference.   The piping structure according to claim 1 or 2, wherein at least a portion of the collective joint embedded in the floor slab is a thermal expansion pipe.   4. The thermal expansion sheet is attached to the outer peripheral surface of at least one of the collective joint and the sound insulation cover over the entire circumference. 5. Piping structure.

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