JPS61116196A - Soundproof 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] [Industrial application field] The present invention relates to architectural piping, particularly to soundproof composite pipes.

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

[Conventional technology]

For this reason, synthetic resin pipes have recently been frequently used for the above-mentioned piping from the viewpoint of waterproofness and chemical resistance. However, supply and drainage,
Noise is generated when liquid such as hot water flows through synthetic resin pipes. This noise is generated 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 housing complexes such as condominiums, the current situation is that noise pollution not only affects one's own house but also other neighboring houses, posing a social problem.

Conventionally, rock wool, anti-vibration rubber, etc. were wrapped around the outer surface of the pipe to prevent the noise generated inside the pipe from propagating to the outside, but these were time-consuming and difficult to install on site. The disadvantage was that the construction period was long.

In order to solve the above problem, a composite pipe is used in which the outer peripheral surface of an inner pipe made of synthetic resin is coated with a hydraulic inorganic material such as cement. In this case, in addition to the above-mentioned inherent water resistance and chemical resistance, the synthetic resin inner tube is made of a non-porous, high-density material, so it has sound insulation properties that reverse the ↑θ of sound waves. However, since the mass of the synthetic resin is relatively small, the above sound insulation properties are not so great. On the other hand, the hydraulic inorganic material coating layer is porous and has a large mass, so it absorbs the noise that could not be reflected by the synthetic resin layer, and the pipe as a whole exhibits sufficient sound absorption. Furthermore, the above-mentioned coating layer is also useful for fire prevention and vibration resistance.

[Problem to be solved by the invention] However, when covering a synthetic resin pipe with a hydraulic inorganic material, it is necessary to use an extremely thick hydraulic inorganic material in order to make it difficult for noise to be transmitted to the outside. No. However, the spaces in which such piping should be installed, such as in the ceiling, under the floor, and inside the walls, are extremely narrow and are lined with many obstacles, making it impossible to install anything sublime. Moreover, even if a sufficient thickness of hydraulic inorganic material can be obtained, there is a drawback that it is expensive.

[Means for solving problems]

The present invention solves the drawbacks of the expensive and costly hydraulic inorganic material coating layer with a simple and inexpensive structure. A composite pipe for supply/drainage comprising a pipe and a coating layer made of a hydraulic inorganic material covering the outer peripheral surface of the inner pipe, the coating layer including a plurality of penetrations parallel to the axis of the composite pipe. This is a soundproof composite pipe with holes formed in it. Moreover, the gist of the second invention is as follows:
A composite pipe for supply/drainage comprising an inner pipe made of synthetic resin and a coating layer made of a hydraulic inorganic material covering the outer peripheral surface of the core inner pipe, the coating layer having a structure along the axis of the composite pipe. This is a soundproof composite pipe in which a plurality of parallel through holes are formed and a porous body is formed in the through holes.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the first embodiment shown in FIGS. 1 and 2, reference numeral 1 denotes an inner tube made of synthetic resin such as hard PVC, which is usually cylindrical and made by extrusion molding. 2 is a coating layer made of a hydraulic inorganic material containing, for example, Portland cement as the main raw material, silica powder, lightweight aggregate, expansion agent, thickener, setting regulator, etc., and is extruded by, for example, a cement extruder. The outer circumferential surface of the inner tube 1 is coated with the hydraulic inorganic material thus prepared to form a composite tube. The above inner tube 1 and coating layer 2
The coating layer 2 may be molded separately and the coating layer 2 may be loosely fitted into the inner tube 1, or the hydraulic inorganic material may be extruded so as to cover the outer peripheral surface of the inner tube 1 formed in advance and then dried. good.

As can be seen from FIG. 2, a plurality of through holes 3 are formed in the coating layer 2 in parallel to the axis of the composite tube.

Since the through hole 3 can be extruded together with the covering layer 2, its manufacture is extremely easy. Further, both ends of the through hole 3 may be open, or may be closed using an appropriate member.

As described above, part of the noise generated within the composite pipe is reflected by the inner surface of the inner pipe 1 and is thus insulated.

The unblocked noise is absorbed by the solid part of the coating layer 2 and is reflected and attenuated in the through hole 3 in a complicated manner.
Almost no noise propagates outside the composite pipe.

In a second embodiment shown in FIG. 3, the entire composite tube has a square cross section. When the through-hole 3 of the composite pipe formed in the same manner as in the first embodiment is filled with a foamable synthetic resin by means such as injection and foamed continuously, a porous body 4 is formed within the through-hole 3. .

Since the porous body 4 has countless pores, some of the noise that has passed through the inner tube 1 undergoes a complicated reaction within the porous body 4 and is severely attenuated.

In the third embodiment (FIG. 4), a porous material 5 such as pearlite or verculite is filled into the through hole 3 instead of the pores of the foamed resin to form the porous body 4. This is the same as the second embodiment. Note that the porous material 5 has a granular shape and has pores open on the surface.

In the fourth embodiment (FIG. 5), a through hole 3 is filled with a powder material 6 such as granules or rocks mainly made of Portland cement, and a porous material 4 is formed by the voids between the particles. You can say that.

The effects of this embodiment are also the same as those of the second embodiment. Next, the effectiveness of the composite pipe of the present invention will be explained using experimental examples.

An L-shaped composite pipe with a diameter of 100 mm is used as a noise measurement device, and 190//min of water is allowed to flow down from above the vertical pipe P, and at point R, which is 500 a+m away from the center line of the vertical pipe P and the horizontal pipe Q, respectively. The noise frequency (Hz) was measured with an octave analyzer, and the noise level (dB) was measured with a sound level meter (Figure 6). The table below shows the noise level when the octave analyzer is set to 500 Hz and 10001 (z) as typical values.

〔table〕

In the table above, each sample is as follows.

Sample A = 20mm thick coating layer formed with normal mortar mixed with cement and sand at a weight ratio of 1:2, Sample B - Same as sample A, same thickness with 50% volume ratio of coating layer.
Sample C - sample B with a through hole formed with a specific gravity of 0.0.
According to the above table, for composite pipes with the same outer diameter, a coating layer with through holes is more effective in soundproofing than a coating layer made only of hydraulic inorganic material. It is believed that forming a porous body within the through hole is more effective.

Based on the above, it is also clear that the structure according to the invention allows the outer diameter of the composite tube to be reduced.

〔Effect of the invention〕

The present invention, configured as described above, can provide a sufficient soundproofing effect even when using a composite pipe with a relatively small outer diameter, and can therefore be applied to narrow spaces in buildings, and can also be used as a solution. Since this can be obtained by inexpensive means, it has many advantages, such as saving on hydraulic inorganic materials.

[Brief explanation of drawings]

Figures 1 and 2 are a perspective view and a cutaway view of the first embodiment, Figure 3 is a perspective view of the second embodiment, and Figures 4 and 5 show main parts of the third and fourth embodiments. The figure shown in FIG. 6 is a schematic diagram showing a noise measuring device. 1--inner tube, 2-covering layer, 3--through hole,
4-Porous body, 5-Porous material, 6.-Powder. Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. A composite pipe for supply and drainage comprising an inner pipe made of synthetic resin and a coating layer made of a hydraulic inorganic material covering the outer peripheral surface of the inner pipe, the coating layer comprising: A soundproof composite pipe having a plurality of through holes formed therein in parallel to the axis of the composite pipe. 2. A composite pipe for supply/drainage comprising an inner pipe made of synthetic resin and a coating layer made of a hydraulic inorganic material covering the outer peripheral surface of the inner pipe, wherein the composite pipe is provided in the coating layer. A soundproof composite pipe comprising a plurality of through holes formed in parallel to an axis and a porous body formed within the through holes. 3. The soundproof composite pipe according to claim 2, wherein the porous body is formed by foaming a foamable synthetic resin within the through hole. 4. The soundproof composite pipe according to claim 2, wherein the porous body is formed by filling a through hole with a porous material. 5. The soundproof composite pipe according to claim 2, wherein the porous body is formed by voids between particles filled in the through holes.