JPH04182565A - Floor structure for preventing vibration and noise - Google Patents

Abstract

PURPOSE:To improve the preventive effect against vibration and noise by charging a granular material large in specific gravity in an interval between a floor plate and a base plate, sealing up the circumference, and interconnecting air in the charged space to the external air. CONSTITUTION:A deck plate 4 is supported on a floor face 1 via a rubber vibroisolator 3, and a floor plate 9 of a soundproof chamber 2 is placed on a veneer board 8. Next, a granular material large in specific gravity such as sand 10 or the like is charged in an interval between the veneer board 8 and the deck plate 4. Then, glass wool 12 is set up in the inner part of a wall member 5 in and around the sand 10, and further a clearance between the floor plate 9 and the wall member 5 is sealed up with a seal 13. With this constitution, the vibro-energy in the floor plate 9 is efficiently damped by mass of the granular material and air in the clearance, and any living vibration and a vibrational noise in plant and equipment can be prevented from being transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to means for preventing noise and vibration propagating through the floors of buildings and other structures.

(Prior Art) Noise that propagates through the floors of buildings and other buildings can be broadly classified into low-frequency heavy impact noise and high-frequency light impact noise.

Among these, the use of a floating floor, a double floor, or a lightweight foam board is known as a floor structure for preventing weight impact noise.

Furthermore, it is known to cover the floor with a shock absorbing material such as a carpet to prevent light impact noise.

(Problem to be solved by the invention) However, there is a problem in that low-frequency vibration noise is difficult to attenuate due to the generation of bending waves inside the flooring material, and high-frequency vibration noise is difficult to insulate unless the material is soft.

Another problem was that the air trapped under the floor vibrated like a drum, transmitting vibrational noise.

Combining multiple soundproofing methods may be considered to overcome these problems, but even in that case, it is difficult to obtain sufficient effects over the entire frequency range.

The present invention has been made to solve the above problems.
The purpose of this invention is to realize a floor structure for vibration and noise prevention with a simple configuration that is effective over a wide frequency range.

(Means for Achieving the Object) For this purpose, the present invention fills the space between the floorboard and the base below it with granular material having a large specific gravity, seals the periphery thereof, and connects the floorboard to the base plate through the granular material. The particulate material is supported by a particulate material, and is provided with means for communicating the air in the space filled with the particulate matter to the outside air.

(Function) Due to the combined action of the granular materials with large specific gravity filled between the floorboard and the foundation and the air existing in the gaps between these granular materials,
Vibration energy is absorbed over a wide frequency range.

Further, since the granules are not continuous, bending vibrations are generated in the space filled with the granules, and the propagation of vibrations due to the bending vibrations is suppressed.

Furthermore, since the filling space and the outside air communicate with each other via the communication means, it is possible to prevent the sealed air in the filling space from transmitting vibrations in a drum-like manner.

(Example) Embodiments of the present invention are shown in FIGS. 1 and 2.

In FIG. 1, 1 is the floor of a building, and a deck plate 4 as a base is supported on the floor 1 via vibration-proof rubber 3.
A vibration-proof and soundproof room 2 is constructed above.

The wall member 5 and the ceiling member 6 of the vibration-proof and sound-proof room 2 have a conventionally known structure in which glass wool is sandwiched between regular board members, and a vibration-proof rubber is installed between the lower end of the wall member 5 and the deck plate 4. Sheet 7 is clamped.

The floorboard 9 of the vibration-proof and soundproof room 2 is constructed on a plywood board 8, and a joist 11 made of square timber is attached to the lower surface of the plywood board 8. Then, sand 10 is filled between the plywood board 8 and the deck plate 4 as a granular material having a large specific gravity. Thereby, the floorboard 9 is supported by the sand 10 via the joists 11 and the plywood board 8.

Note that both the plywood board 8 and the floorboard 9 are arranged inside the wall member 5 and have a structure independent from the wall member 5.

Glass wool 12 is disposed inside the wall member 5 around the sand 10 as an air communication means. The glass wool 12 does not allow the sand 10 to pass through and confines the sand 10 between the plywood board 8 and the deck plate 4, while the air in the space filled with the sand 10, that is, the air between the particles of the sand 10, and the outer wall member 5 Ensure communication with internal air. glass wool 12
The gap between the upper floorboard and the wall member 5 is sealed by a seal 13.

Further, in order to ensure air communication inside the space filled with sand 10, air holes 14 as shown in FIG. 2 are appropriately formed in the joists 11.

Next, the effect will be explained.

When equipment installed on the floorboard 9 generates vibration or noise, the vibration energy is transmitted to the floorboards, the plywood 8 and the joists 11, and further propagates downward. The filled sand 10 with a large specific gravity and the air layer in the gap act in a complex manner to efficiently attenuate vibration energy from low frequency components to high frequency components.

Further, since the sand 10 is granular, bending vibrations caused by a bending moment acting on a continuous solid body do not occur, and vibration energy due to bending vibrations is not propagated.

Furthermore, since the air in the gaps between the sand 10 communicates with each other via the grooves 14 and the like, and further communicates with the outside via the glass wool 12, even if a pressure wave is generated by an impact, the air between the sand 10
There is no fear that the air in the filled space will vibrate in a drum-like or spring-like manner, and the propagation of pressure waves is also suppressed.

Note that both the floorboard 9 and the plywood board 8 are supported by the sand 10 and are structurally isolated from the wall member 5, so the floorboard 9
There is also no fear that vibration energy will propagate from the plywood board 8 to the wall member 5.

In this way, the propagation of vibration energy is efficiently blocked in various ways, so that vibrations and noise generated within the vibration-proof and sound-proof room 2 are hardly transmitted to the floor surface 1.

Therefore, for example, this floor structure can be applied to the floor of a living room in an apartment complex to absorb daily noise and vibrations, or it can be applied to the floor of an equipment room where equipment is housed to absorb machine vibrations and noise. , favorable vibration-proofing and sound-proofing effects can be obtained.

(Effects of the Invention) As described above, the present invention fills the space between the floor slab and the foundation with granular materials of high specific gravity such as sand, seals the surrounding area, and
Since a means is provided to communicate the air in the filled space with the outside air, the vibration energy of the floorboard is efficiently attenuated by the mass of the granules and the air in the gaps, and the generation of bending vibrations due to the granules is also suppressed. . In addition, since the air in the gaps between the particles communicates with the outside through the communication means,
It is also possible to prevent the phenomenon in which the ff1fffed air transmits vibrational energy in a drum-like manner.

Therefore, it is highly effective in preventing the transmission of daily life noises and vibrations, as well as vibrations and noises from equipment.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a vibration and soundproof room showing an embodiment of the present invention, #
Figure 12 is a side view of the joists. 1... Floor surface, 2... Vibration and soundproof room, 4...-Deck plate, 8... Plywood board, 9-... Floor board, 10...-
Sand, 11... Joist, 12... Glass wool, 14.
-・Air hole. Patent applicant: Dainichi Main Tree Co., Ltd. - Ninini agent Patent attorney: Masaki Goto 7, (1 other person) '-==

Claims (1)

[Claims] Particulate matter with a large specific gravity is filled between the floorboard and the base below it, and the surrounding area is sealed, and the floorboard is supported on the base via this particulate matter, and the air in the space filled with the particulate matter is removed from outside air. A floor structure for preventing vibration and noise, characterized by having a means for communicating with the floor structure.