JPS63225782A - Sound-insulating composite pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to architectural piping, particularly to fire-resistant composite pipes with excellent sound insulation properties.

[Conventional technology]

Conventionally, metal pipes such as cast iron have been used for supply pipes, drain pipes, hot water pipes, etc. in buildings, but if used for a long period of time, they will rust and break.

For this reason, recently, fire-resistant double-layer pipes are often used for the above-mentioned piping, which have an inner pipe made of a synthetic resin with excellent waterproofness and chemical resistance, and whose outer peripheral surface is coated with a fire-resistant hydraulic inorganic material. However, noise is generated when liquids such as supply, drainage, and hot water flow through synthetic resin pipes. This noise is caused by fluctuations in the pressure inside the pipe due to discontinuity in the flow of liquid in the pipe, or by violent collision of the liquid with the inner wall surface of the pipe, and the noise propagates to the outside of the pipe. Especially now that there are many apartment buildings such as condominiums, noise pollution has become a social problem, not only for one's own house but also for other neighboring houses.

Conventionally, in order to prevent the noise generated inside the pipe from propagating to the outside, rock wool or the like was wrapped around the outer circumferential surface of the pipe.
A sound absorbing layer made of glass fiber or urethane foam is provided between the inner tube and the outer tube (Japanese Patent Laid-Open No. 6O-30887), or a through hole is provided in the outer tube parallel to the axial direction (Japanese Patent Laid-Open No. 6L-116196).
).

[Problem to be solved]

In addition to the above-mentioned inherent water resistance and chemical resistance, the synthetic resin inner tube is made of a nonporous, high-density material, so it has sound insulating properties that repel sound waves. However, since the mass of the synthetic resin is relatively small, the above-mentioned sound insulation properties are not so great. Since the coating layer of the hydraulic inorganic material is porous and has a large mass, it absorbs a certain amount of noise that could not be repelled by the synthetic resin layer, and even rebounds it. However, with only the above-mentioned synthetic resin inner tube and the hydraulic inorganic material covering its outer circumferential surface, it must be extremely thick in order to comply with the strict noise regulations that have been required in recent years. However, the spaces in which such piping must be installed, such as in the ceiling, under the floor, and inside the walls, are extremely narrow and there are many obstacles, making it difficult to install thick-walled pipes. be. Furthermore, the method of wrapping rock wool or the like around the outer circumferential surface of the pipes after laying the pipes has the same problems as above, and also has the disadvantage that it takes time and effort in on-site construction and lengthens the construction period.

Under these circumstances, it has been desired to develop a piping material that has excellent properties such as chemical resistance, water resistance, fire resistance, and workability as well as excellent sound insulation properties and is convenient to handle.

[Failure to solve the problem]

The present invention has been made to solve the above problems, and its gist consists of an inner tube made of synthetic resin, a sound insulating layer covering the outer circumferential surface of the inner tube, and a hydraulic layer covering the outer circumferential surface of the sound insulating layer. The present invention provides a sound-insulating composite pipe characterized in that it is comprised of a coating layer coated with an inorganic material.

Furthermore, by forming a vibration-proofing layer between the synthetic resin inner tube and the sound-insulating layer, or between the sound-insulating layer and the covering layer made of a hydraulic inorganic material, the earthquake-proofing and sound-proofing effects can be further improved. improves.

Here, the sound insulation layer is, for example, a so-called sound insulation sheet made by mixing a synthetic resin such as rubber or polyvinyl chloride with a material with a relatively high specific gravity such as lead, barium sulfate, or ferrite, and molding the mixture by heating or pressurizing. It is formed by covering one layer or two or more layers. What is sound insulation?

The idea is to reflect the sound off the wall and prevent it from propagating to the outside.

In addition, as the vibration-proof layer, for example, vibration-proof Gola Q-raswool sheet, foamed polystyrene sheet), foamed urethane sheet,
It is constructed from a so-called damping (vibration damping) material that easily absorbs vibrations, such as paper. Vibration isolation is the prevention of vibration by absorbing the diffused vibration component of vibration waves.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited thereto.

FIG. 1 is a perspective view of a sound-insulating composite pipe (Example 1) in which the outer circumferential surface of a synthetic resin inner tube is coated with a sound-insulating layer, and the outer circumferential surface is further coated with a hydraulic inorganic outer tube.

In FIG. 1, numeral 1 denotes an inner tube made of synthetic resin such as hard PVC, which is usually made by extrusion molding. 2 is a soft sound insulation sheet, which is usually about 1 to 4M11 thick and is made by mixing lead, barium sulfate ferrite, etc. with rubber or synthetic resin such as polyethylene for sound insulation, heating and press-molding it. . When covering a synthetic resin inner pipe with a sound insulating sheet, you can insert a sheet that has been previously processed into a cylindrical shape to match the outside diameter of the synthetic resin pipe, or wrap it directly around the synthetic resin pipe at a designated position. A method such as cutting and bonding the cut end surfaces with an adhesive may also be used. The covering layer of the synthetic resin inner tube coated with the sound insulating sheet usually only needs to be one layer, but it can also be made up of two or more layers depending on the degree of sound insulation required. 3, for example, uses Portland cement as the main raw material, silica sand powder, lightweight aggregate,
A coating layer made of a hydraulic inorganic material containing an expanding agent, a thickening agent, a setting regulator, etc.
The inner tube 1 is molded by the method described in the above publication.

A composite pipe is formed by covering the outer peripheral surface of the sound insulating sheet 2.

The above-mentioned inner tube 1, sound insulation sheet 2, and coating layer 3 may be molded separately and the coating layer 3 may be loosely fitted to the inner tube 1 and the sound insulation sheet 2, or the inner tube 1 formed in advance, and sound insulation sheet 2
The hydraulic inorganic material may be molded to cover the outer peripheral surface of the material and then cured and dried.

FIG. 2 is a perspective view of a sound-insulating composite pipe (Example 2) in which a vibration-proofing layer 4 is formed between the inner pipe l and the sound-insulating layer 2 of the composite pipe of Example 1.

4 is a glass wool sheet provided mainly for the purpose of vibration isolation, and in addition to this, soft materials such as expanded polystyrene or paper that contain a certain amount of air space can also be used. When covering a synthetic resin inner tube with a glass wool sheet, foamed polystyrene, paper, etc., you can insert a material that has been previously processed into a cylindrical shape to match the outer diameter of the synthetic resin tube, or you can directly coat the synthetic resin tube with Alternatively, the material may be wound around the material, cut at a predetermined position, and the cut end surfaces may be bonded with adhesive. Alternatively, a glass wool sheet or the like may be pasted on one side of the sound insulation sheet in advance. The sound insulating layer and the covering layer are formed in the same manner as in Example 1.

FIG. 3 is a perspective view of a sound-insulating composite pipe (Example 3) in which a vibration-proofing layer 4 is formed between the sound-insulating layer 2 and the water-soluble inorganic layer 3 of the composite pipe of Example 1.

Next, the effectiveness of the sound-insulating composite pipe of the present invention will be explained using an experimental example.

The experimental method will be explained with reference to FIG. An L-shaped double brass tube with a diameter of 130+ m was used as a noise measurement device, and 9017 liters of water was allowed to flow down from above the vertical pipe P, and at 8 points 500 W away from the center line of each of the vertical pipe P and the horizontal pipe Q. Noise frequency (Hz) octave analyzer, and noise level (dB)
-A) was measured with a sound level meter. 500 as a typical value
The noise level when the octave analyzer is adjusted to Hz and 1ooOHz is shown in the t-11 table.

Table 1 Sample 500Hz 1000Hz Unit d
B-A (Hon) A 43 46 B 35 36 C3436 D 30 32 In the above, each sample is as follows.

Sample: Conventional fireproof double-layer pipe (PVC pipe ■10-hydraulic hardness A
Inorganic pipe, thickness 8 sheets) Sample: Salt pipe VU soft sound insulation sheet (Sandam B
810, thickness 1.1 m, single layer roll) Soil-hydraulic inorganic material (same composition as sample A, thickness 6.8 m) Sample: Salt pipe ■ + glass wool sheet (thickness C1,
Om, single layer roll) 10 soft sound insulation sheets (Sundam SIO,
Thickness: 1.1 m, single layer roll) Soil-hydraulic inorganic material (same composition as sample A, thickness: 5.8 am) Sample: Salt pipe
5IO1 Thickness 1.1 + m, single layer roll) 10 Anti-seismic rubber (thickness 1.0 + m, single layer roll) Soil-hydraulic inorganic material (same composition as sample A, thickness 5.8 ttaa) Composite with the same outer diameter according to Table 1 It can be seen that by providing a sound insulating sheet for pipes, the sound insulation properties are significantly increased compared to conventional fireproof double layer pipes. Also provided with an earthquake-proofing layer (samples C and D)
There was almost no vibration.

[Effect]

Part of the noise generated inside the composite pipe is repelled by the inner surface of the inner pipe 1, and the noise that cannot be blocked is repelled by the sound insulation layer 2, and the noise that cannot be blocked is covered with hydraulic inorganic material. Since the noise is repelled and attenuated by layer 3, the noise hardly propagates to the outside of the composite pipe. Further, by further interposing a vibration-proofing layer 4 such as a relatively soft glass wool sheet containing an air layer, a foamed polystyrene sheet, or paper, a vibration-proofing effect can be exerted.

〔Effect of the invention〕

(1) A piping material with excellent sound insulation properties can be provided without losing the advantages of conventional fire-resistant double-layer pipes.

(2) Sound insulating sheets convenient for forming sound insulating layers can be easily mass-produced, and since they are commercially available, inexpensive ones can be used as they are.

(3) The sound-insulating composite pipe of the present invention can be mass-produced in a factory, so if one composite pipe is used, there is no need for on-site soundproofing work.

[Brief explanation of drawings]

1 to 3 are perspective views of a sound-insulating composite pipe showing an example of the present invention, and FIG. 4 is an explanatory diagram of an experimental method for confirming the effects of the present invention. 1... Synthetic resin inner tube, 2... Sound insulation layer, 3... Covering layer, 4... Vibration isolation layer.

Claims (1)

[Claims] 1. Consisting of an inner tube made of synthetic resin, a sound insulation layer covering the outer circumference of the inner tube, and a coating layer covering the outer circumference of the sound insulation layer with a hydraulic inorganic material. A sound-insulating composite pipe characterized by: 2. The sound insulating composite pipe according to claim 1, which has a vibration isolating layer on the inner circumferential surface and/or the outer circumferential surface of the sound insulating layer.