JPH0814468A - Fireproof multi-layer pipe for drainage and ventilation - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a fireproof multilayer pipe for drainage / ventilation, which has a significant noise reduction effect and does not require additional work during construction, and does not increase the shaft space. [Structure] The outer peripheral surface of a vinyl chloride pipe 2 is covered with a tube 3 made of a viscoelastic body, and a fiber mortar pipe 4 is fitted on the outer periphery of this tube, so that energy of pipe wall vibration can be transferred from the viscoelastic body. The fireproof multi-layer tube itself has a function of absorbing vibration energy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage / ventilation refractory multilayer pipe for indoor piping.

[0002]

2. Description of the Related Art Conventionally, as a drainage / ventilation refractory multilayer pipe of this type, as shown in FIG. 2, a fireproof double-layer pipe having a two-layer structure in which a fiber mortar pipe 32 is fitted around a vinyl chloride pipe 31. 33 are known. When this fire-resistant double-layer pipe 33 is used for drainage and ventilation of a building, it suppresses the transmitted sound radiated from the surface of the pipe, the transmitted sound that penetrates the pipe wall, and the solid sound that is generated when the running water strikes the pipe wall. Therefore, as shown in FIG. 3, the outer peripheral surface of the fiber mortar pipe 32 is coated with glass wool (for example, 24k-25t) 34, and the outer periphery of the glass wool 34 is further covered with a high-density rubber sheet 35 to form a drain pipe 36. After that, as shown in FIG. 4, the pipe 37 is inserted into the through hole 40 of the floor 39 in the pipe shaft 38, the drain pipe 36 is supported by a plurality of support fittings 41, and the through hole 40 around the drain pipe 36 is provided. By filling mortar 42 into the fireproof double-layer pipe for drainage and ventilation. The drain pipe 36 has a quantitative soundproofing effect of 10.2 dB-A as compared with the case where only the fire-resistant double-layer pipe 33 is used.

[0003]

However, in the conventional fire-resistant double-layer pipe, since the transmitted sound and solid sound which are noises are suppressed by sound absorption and sound insulation, the outer periphery must be covered with glass wool and a high-density rubber sheet. However, the additional work is troublesome, the shaft space for the drainage vertical pipe is large, and the cost is high. on the other hand,
According to a recent study (see “Sound Insulation Performance Test Report of Fireproof Double-layer Pipes for Drainage / Ventilation” published by H5.8 Fireproof Double-layer Pipe Association)
The sound pressure level at the time of drainage is the octave band center frequency 3
In the vicinity of kHz, the solid sound on the pipe wall exceeds the transmitted sound by about 20 dB-A, and there is almost no difference in the sound pressure level between the solid sound and (solid sound + transmitted sound) at the same frequency. It has been found that the sound emitted from the pipe is dominated by the solid sound due to the vibration of the pipe wall rather than the transmitted sound. Therefore, according to the present invention, a significant noise reduction effect can be obtained by damping only the pipe wall vibration, and additional work at the time of construction is not required, so that the shaft space is not increased and the cost is superior. The purpose is to provide a fireproof multi-layer pipe for drainage and ventilation.

[0004]

In order to solve the above problems, the drainage / ventilation refractory multi-layer pipe of the present invention has a vinyl chloride pipe whose outer peripheral surface is covered with a tube made of a viscoelastic body. It is characterized in that a fiber mortar tube is fitted. The viscoelastic body is preferably a vibration-proof rubber. Also, the loss factor of the anti-vibration rubber is 1
It is desirable to be 10 × 10 ⁻¹ .

[0005]

In the drainage / ventilation refractory multilayer pipe of the present invention,
The energy of the tube wall vibration is absorbed by the tube made of a viscoelastic body, and the fireproof multilayer tube itself has a vibration energy absorbing function.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the fireproof multilayer pipe for drainage and ventilation of the present invention. This drainage / ventilation refractory multilayer tube 1 has a three-layer structure in which the entire outer peripheral surface of a vinyl chloride tube 2 is covered with a tube 3 made of a viscoelastic body, and a fiber mortar tube 4 is fitted on the outer periphery of the tube 3. ing. As the viscoelastic body, a vibration proof rubber having a loss coefficient of 1 to 10 × 10 ^-1 is used.

Here, the loss coefficient η which is one of the indexes showing the vibration damping characteristics of the drainage / ventilation refractory multilayer pipe 1 is expressed by the following equation.

[0008]

[Equation 1]

Further, the maximum value η _max of the loss coefficient is Shea
When r Parameter is given in the vicinity of 1 and g = 1, h ₁ , h ₃ >> h ₂ , and η _a ² << 4 under the following conditions, substituting the respective physical property values, the following formula is given: Be done.

[0010]

[Equation 2]

That is, comparing the product of the present invention with a conventional refractory two-layer tube supported by a supporting metal fitting with a polystyrene band (loss factor of 1 to 5 × 10 ^-2 ) interposed therebetween, the product of the present invention is better. , The loss factor is increased by about 1 to 2 × 10, and the vibration of the pipe wall can be suppressed much more than the conventional one.
It can be seen that solid noise from the pipe wall can be reduced.

[0012]

As described above, according to the drainage / ventilation refractory multilayer pipe of the present invention, the vibration energy of the pipe wall is absorbed by the tube made of the viscoelastic body, so that the radiation sound from the drainage pipe is controlled. It is possible to reduce the solid noise that is generated, and it is possible to obtain a remarkable noise reduction effect. In addition, since the fire-resistant multilayer pipe itself has a vibration energy absorbing function, it is possible to eliminate the need for additional work at the time of pipe construction, and not to increase the shaft space as in the past, and to reduce the cost. It can be made excellent.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a fireproof multilayer pipe for drainage and ventilation of the present invention.

FIG. 2 is a cross-sectional view of a conventional drainage / ventilation refractory double-layer pipe.

3 is a cross-sectional view of a drainage pipe using the fire-resistant double-layer pipe of FIG.

FIG. 4 is an explanatory view showing a piping state of the drainage pipe of FIG.

[Explanation of symbols]

 2 Vinyl chloride pipe 3 Tube 4 Fiber mortar pipe

Claims (3)

[Claims] 1. A drainage / drainage characterized in that an outer peripheral surface of a vinyl chloride pipe is covered with a tube made of a viscoelastic body, and a fiber mortar pipe is fitted around the outer periphery of the tube.
Fireproof multilayer tube for ventilation. 2. The fire-retardant multi-layer pipe for drainage and ventilation according to claim 1, wherein the viscoelastic body is a vibration-proof rubber. 3. The loss factor of the vibration-proof rubber is 1 to 10 ×.
The fire-retardant multi-layer pipe for drainage and ventilation according to claim 2, wherein the fire-retardant multi-layer pipe is 10 ^-1 .