JPS6030887A - Sound-absorbing-and-insulating tubular body - 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 The present invention relates to a tubular body that can effectively block noise generated from fluid piping installed in a building.

There are various types of noise generated in the piping systems of buildings. In drainage pipe systems, sounds are generated when water passes through attached drainage equipment, shock waves caused by falling water when the head of the drain pipe is large, or when air bubbles contained in the drainage collapse. There are sounds generated when impact waves caused by cavitation are reflected and resonated within the drain pipe. In the case of water supply pipes, there is an impact sound caused by water hammer when passing through valves, etc.

In the case of ventilation pipes or exhaust ducts, the sound source is the outflow sound of the blower 1, and the secondary sound propagates through the pipe wall and space of the pipe, and the airflow at bends and branches of the duct. Noise may be generated due to vortex flow or vibration of the pipe wall.

Conventional methods for preventing such noise include placing concrete blocks, concrete, or porous concrete walls or pipes in the space around the pipes after piping, or covering the pipes with asbestos cement or porous concrete. However, the method of installing the pipe in the space around the pipe is difficult when the pipe is long, there is only a narrow space around the pipe, there are many bends in the pipe, or when the pipe is installed on the ceiling without any gaps. Complete coverage is difficult in construction, involves wasteful occupation of space, or is dangerous, which has been considered a problem.

Furthermore, when using the above-mentioned coating method, vibration noise often propagates through the coating material and generates secondary vibration noise and impact noise, and improvements have been desired in terms of sound absorption. .

The present invention relates to a sound absorbing and insulating tubular body that can efficiently absorb and insulate the noise generated from the piping portion as described above, and the gist thereof is that the inner tube has an open porosity of 50 to
The sound-absorbing and insulating tubular body has an integral covering layer consisting of an inner layer with a volume of 99 cm and a dense outer layer with a density of 1.0 g/cm or more and a thickness of 0.5 to 5 cm.

The contents of the present invention will be explained below using the drawings. FIG. 1 shows a configuration example of a circular tubular body according to the present invention, and FIG. 2 shows a cross-sectional view of a quadrangular tubular body.

In each figure, 1 indicates an inner tube, and 2 and 3 indicate an inner layer and an outer layer in the coating layer.

The inner tube is not particularly limited in terms of material, but it tends to generate noise, which is a problem in the subject of the present invention, and synthetic resin tubes, metal tubes, and ceramic tubes are mainly targeted.

The inner layer has an open porosity of 50 to 99 volume, and the outer layer has a density of 1-0. 9/cm3 or more and its thickness is 0.5
The effects of the present invention cannot be obtained unless the two layers are integrated.

The open porosity of the inner layer is 50 to 99 by volume, which is the value when it is integrated with the outer layer, and suitable materials include various fibers (particularly preferably glass fibers, metal fibers, mineral fibers, and organic synthetic fibers). Cloak (usually 65-99% by volume),
Concrete with open pores with a high specific gravity of 03 to 0.5 (
(usually 50 to 95% by volume), phenol foam or urethane foam (usually 70 to 98% by volume) are suitable. A method for producing concrete with such a low specific gravity and open pores is disclosed, for example, in Japanese Patent Application No. 128599/1982.

The reason why the above-mentioned inner layer is required to be open rather than simply having a porosity is that simply increasing the porosity by incorporating spherical foamed aggregate such as pearlite is not effective, and at least the inner layer must be open on the surface of the inner tube. This is because the effects of the present invention can only be obtained if the method is used.

These inner layer materials are wrapped around the outer periphery of the inner tube by a commonly used wrapping method, but in that case, they do not necessarily need to be bonded to the inner tube.

The outer layer is integrated with the inner layer using an adhesive on the outside of the inner layer or by the adhesion of the outer layer material itself to the inner layer.

This outer layer material is dense and has a density of 1. , Ofl/cm
It must be 6 or more, and the thickness must be 0.5-5.

Materials suitable for this purpose include portland cement, alumina cement, hydraulic materials whose main components are gypsum, etc.
Resin mortar, lead, metal materials such as cast iron, clay pipes, ceramic pipes, and ceramic materials are preferably used.

In the case of hydraulic cement, resin mortar, etc., it can be applied in a sheet form to the outer surface of the inner layer in an uncured state, or it can be applied by spraying or spraying.

If a metal tube or metal plate is used, an adhesive such as epoxy or acrylic is used to integrate it with the inner layer.

If the above-mentioned requirements are not met at the same time, it is not possible to effectively absorb and insulate noise from the inner pipe.

Moreover, only when these requirements are met will a soundproofing performance of 3 dB or more, which is normally recognized as noiseproofing, be achieved.

The present invention will be described in detail below using Examples.

Rigid vinyl chloride ie with various coatings mentioned below
Eve (inner tube wall thickness 3.5 ttrm, inner diameter 109 mm,
2.5 m long) were arranged in the vertical direction, and the lower end was extended perpendicularly with an L-shaped pipe joint having the same coating, and water was flowed at 4 degrees at 80 t/min. In this case, the soundproofing effect was measured at a position 3 m away from the pipe.

[Brief explanation of drawings]

FIGS. 1 and 2 show cross-sectional views of an inner tube having an inner and outer covering layer, respectively. Patent applicant: Showa Denko Co., Ltd. Representative: Sei Kikuchi −

Claims (1)

[Claims] The inner tube has an inner layer with an open porosity of 50 to 99 volume and a density of 1.0.
A sound absorbing and insulating tubular body having a covering layer integrated with a solid outer layer having a thickness of 0.5 to 5 am and a thickness of 0.5 to 5 am.