JPH0449368A - Double floor construction - Google Patents

Abstract

PURPOSE:To improve sound-proof property by supporting panel members provided with a plurality of holes, on a floor bed, with bearing leg bodies having elastic bodies to be buckling-deformed at the time of compression. CONSTITUTION:Bearing leg bodies 3 consisting of rubber-shaped elastic bodies 31 provided with hollow sections 31a to be buckling-deformed at the time of compression, and regulating bolts 32 for regulating levels are formed. After that, square panel members 2 having a plurality of penetration holes 21 are arranged, and on the lower surface, the bearing leg bodies 3 are fitted, and floor panels 4 are formed. After that, on a plurality of the floor panels 4 arranged on a floor bed 1, the ventilating floor finish material of a carpet or the like is laid. When the floor finish material of wooden floor material or the like without ventilating property is used, then on the panels 4, floor finish material 8 is laid via wooden joist material 6 and submaterial 7. As a result, even if a space under a floor is low, noise-proofing can be stably improved at the time of weight impact, and walking property and safety degree at the time of lightweight impact can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a double floor structure installed on a subfloor consisting of floor panels, concrete floor slabs, etc. via height-adjustable support legs. , especially regarding a double floor structure with improved soundproofing properties.

(Conventional technology) Conventionally, the floor structure of buildings such as mid-to-high-rise buildings and condominiums has been made by using concrete floor slabs, etc.
Floor panels with a plurality of height-adjustable support legs attached to the lower surface of a panel material made of plywood, particle board, etc. are installed side by side, and an appropriate floor finish is applied on top of the floor panels. The so-called double-bed structure is known.

This double floor structure can absorb the unevenness of the subfloor with height-adjustable support legs, eliminating the need for adjustment work such as smoothing the subfloor, and eliminating the need to assemble the subfloor. ,
It has the advantage of being easy to construct and shortening the construction period, and it also has the advantage of allowing piping and wiring work to be carried out in the underfloor space formed below the panel material.

However, the above-mentioned double floor structure has a problem in soundproofing performance as explained below. In other words, the legs of the support legs that support the panel material are usually made of bolts made of metal or synthetic resin, so when a floor impact force is applied to the panel material, the floor impact force is It acts intensively on the floor and is transmitted intensively to the subfloor.

In addition, when an impact force is applied to the floor surface, the panel material bends using the support parts supported by the support legs as fulcrums and the span between the support parts, so the air pressure in the underfloor space increases momentarily. ,
A so-called drum phenomenon occurs in the underfloor space, causing bending vibrations in the subfloor. Therefore, when a floor impact force is applied, a large amount of noise is generated downstairs.

In this case, if the under-floor space is high or wide, air will easily diffuse even if it receives floor impact force, and the increase in air pressure in the under-floor space will be relatively small; however, if the under-floor space is low in height, When a floor impact force is applied, the air pressure in the space under the floor increases momentarily, causing a lot of noise downstairs.

Furthermore, the bending energy stored in the floor panel at the time of floor impact causes bending vibration of the panel material, which is transmitted to the subfloor via the support legs, which also generates noise downstairs.

In each of the above cases, the impact force of the lightweight body that occurs when a lightweight object such as a spoon or knife falls onto the floor concentrates on the supporting legs and is likely to be transmitted downstairs as lightweight floor impact noise. On the other hand, the heavy floor impact force that occurs when a child jumps on the floor appears as an increase in air pressure in the space under the floor, and also as an impact force transmitted through the supporting legs, causing a heavy floor impact sound to be heard downstairs. occurs.

Therefore, one method to improve the soundproofing performance of a double floor structure is to provide through-holes in the panel material and support the panel material via an elastic body, so that the air in the under-floor space is channeled through the through-holes into the above-floor space when a floor impact occurs. A double floor structure has been proposed that prevents instantaneous increases in air pressure in the underfloor space by venting the air to the floor.

(Problem to be Solved by the Invention) However, in order to support the panel material via an elastic body and vent the air in the underfloor space to the above-floor space in the event of a floor impact, it is necessary to provide holes in the floor panel and further reduce the impact force. For example, as shown in Fig. 8, it is necessary to support the floor panel d with a soft cushioning material that is easily compressed and deformed, such as a glass fiber mat. has the following problems. In other words, glass fiber mats tend to become denser when compressed, and when combined with weak legs such as support legs, the floor surface tends to sink.
- There is a problem that once the density is increased, the restoring force decreases.

On the other hand, instead of the above-mentioned glass fiber mat, a rubber-like elastic body with excellent restorability can be used to construct the structure as shown in Fig. 9, but in this case, while the floor surface can be stabilized, When a large impact force is applied, the impact force is not sufficiently absorbed and is transmitted to the floor subfloor, resulting in a problem in that the floor impact noise caused by the heavy floor impact force, such as when a child jumps, becomes louder.

On the other hand, as a measure to increase the shock absorption power of the rubber-like elastic body and reduce the impact force transmitted from the support legs to the subfloor, the shape of the elastic body is buckled under compressive load as shown in Figure 10. One idea is to support the floor panel by making it into a shape that looks like this.

However, in this case, when the elastic body buckles and deforms due to the heavy floor impact force, the floor panel sinks momentarily, increasing the air pressure in the underfloor space and making it easier for the heavy floor impact sound to be transmitted downstairs. There was a problem.

In recent years, in mid-to-high-rise housing, it has become desirable to lower the height of the floor panels and raise the ceiling height in order to make the living space as wide as possible within the limited space.
When using the elastic body that buckles and deforms as described above, the narrower the height of the underfloor space, the more likely the air pressure in the underfloor space increases due to heavy floor impact sound, and the pressure also increases, so the difference in the height of the underfloor space There is a problem that the soundproofing performance changes depending on the situation and is not stable.

The present invention has been made in view of the above problems, and
In the event of a heavy floor impact, the panel material does not sink too much to ensure walkability and safety, while in the event of a heavy floor impact, it reduces the transmission of impact force from the support legs and directs the air in the underfloor space to the outside. The purpose of this invention is to provide a double floor structure that can exhibit excellent soundproofing performance without being affected by the height of the underfloor space by preventing the transmission of impact force caused by increased air pressure. .

(Means for Solving the Problems) In order to achieve the above object, the invention of claims (1) and (2) provides a panel material having through-holes with a rubber-like elastic material that buckles and deforms when a compressive load is applied. By supporting the panel material through the body, the panel material can be largely displaced downward upon a heavy floor impact without using a particularly soft elastic body.

Specifically, the solution taken by the invention of claim (1) is a panel material having a large number of through holes passing through the upper and lower surfaces, and a panel material that is attached to the lower surface of the panel material and is capable of buckling deformation at the lower end under a compressive load. A floor panel consisting of a plurality of height-adjustable support legs having a rubber-like elastic body of a generally shaped shape is installed in series on a subfloor made of a concrete floor slab or the like.

Moreover, the solution specifically taken by the invention of claim (2) is a panel material having a large number of through holes penetrating the upper and lower surfaces;
A floor panel consisting of a plurality of height-adjustable support legs attached to the lower surface of the panel material and having a rubber-like elastic body shaped to buckle under a compressive load at the lower end is a concrete floor slab. A plate-shaped body is placed on the floor subfloor consisting of the above-mentioned floor panels and the like to form an under-floor space between the floor panel and the floor panel, and a plate-like body is placed between the floor panel and the above-mentioned under-floor space through the through-hole of the panel. It is laid through a spacer so as to form a space that communicates with the space.

(Function) According to the structure of the invention as claimed in claim (1), when a heavy floor impact force is applied to the panel material, the impact force transmitted to the subfloor due to buckling deformation of the rubber-like elastic body is buffered.

Further, when the panel material is displaced downward due to a heavy floor impact, the air in the underfloor space is released into the above-floor space through the through holes in the panel material, thereby preventing a momentary increase in air pressure in the underfloor space.

Further, according to the configuration of the invention of claim (2), when the panel material is displaced downward due to a heavy floor impact, the air in the underfloor space flows out into the space above the panel material through the through hole in the panel material, In order to spread the space horizontally, as above,
A momentary increase in air pressure in the underfloor space is prevented.

(Example) Embodiments of the present invention will be described below based on the drawings.

1 and 2 show a double floor structure according to a first embodiment of the present invention, in which a square panel material 2 is placed on a floor base 1 made of a concrete floor slab or the like. and, for example, four supporting legs 3 attached to the lower surface of the panel material 2.
A plurality of floor panels 4 made up of the following are installed in a row, and the support legs 3 are attached to the lower surface of the panel material 2, so that there is no underfloor space between the floor base 1 and the floor panel 4. 5
or is formed.

As the panel material 2, a wooden board such as plywood or particle board, a wood cement board, a metal molded panel, etc. can be used, and it supports the load of the floor finishing material such as carpet material laid on it and the load on the floor. It suffices if it has as much rigidity as possible.

The panel material 2 is provided with, for example, eight through holes 21 having a diameter of, for example, 20 mm, which are opened on the upper surface of the panel material 2 and are spaced approximately equally in the vertical and horizontal directions. are in communication through the through hole 21. Further, when a breathable carpet material is used as the floor finishing material, the underfloor space 5 and the indoor space are communicated through the through hole 21 of the floor panel 4 and the carpet material.

As shown in detail in FIG. 3, the support legs 3 include a rubber-like elastic body 31 made of natural rubber or synthetic rubber placed on the flooring 1, and a rubber-like elastic body 31 that is erected. By rotating the mii bolt 32, it consists of an adjustment bolt 32 for adjusting the height, and a disc-shaped washer 33 that is screwed into the upper end of the adjustment bolt 32 and attached to the lower surface of the panel material 2. Height is adjustable.

The rubber-like elastic body 31 is formed in a shape that can be buckled and deformed when subjected to a compressive load, for example, a shape that has an approximately O-shaped cross section as a whole and has a hollow portion 31a passing through. Figure 4 (a) when no compressive load is applied.
It has a vertically elongated shape as shown in FIG. 4(b), and when subjected to a compressive load exceeding this level, it buckles and deforms into the shape shown in FIG. 4(b). Therefore, as shown in FIG. 13, the rubber-like elastic body 31 has a relationship between the load per support leg 3 and the amount of deformation within a low load range until the hollow portion undergoes buckling deformation. The amount of deformation is small, but when it reaches a high load range where buckling begins, the amount of deformation increases, and compared to the amount of deformation of a truncated cone-shaped elastic body that does not buckle, it It deforms greatly.

Since the first embodiment has the above-described structure, when a large impact force such as a heavy floor impact force is applied to the panel material 2, the rubber-like elastic body 31 buckles and deforms, and the amount of deformation decreases. is much larger than the amount of bending deflection of the panel material 2, so the weight floor impact force is buffered by the buckling deformation of the rubber-like elastic body 31.

When the panel material 2 is displaced downward, the underfloor space 5
The air is released into the above-floor space through the through holes 21 provided in the panel material 2. Therefore, due to the impact absorption effect due to the buckling deformation of the rubber-like elastic body 31 and the effect of suppressing the increase in air pressure due to the air flow in the underfloor space 5, the impact force is transmitted from the support legs 3 and the air pressure in the underfloor space 5 increases. is simultaneously prevented, and the soundproofing performance during heavy floor impact is significantly improved.

FIG. 5 shows a double floor structure according to a second embodiment of the present invention,
Similar to the first embodiment, this double floor structure consists of a panel material 2 and four supporting legs 3 attached to the lower surface of the panel material 2 on a floor base 1 made of a concrete floor slab. A plurality of floor panels 4 are installed in a row, and on top of the floor panels 4, a board material 7 as a plate is laid through wooden joists 6 as spacers, and on top of the board material 7, a floor finishing material 8 is laid. It is a structure in which In this double floor structure, since the wooden joist 6 is interposed between the floor panel 4 and the lining material 7, a space 9 is formed between the floor panel 4 and the lining material 7. At the same time, the space 9 and the underfloor space 5 communicate with each other through the through hole 21 of the panel material 2. It should be noted that plywood or the like can be appropriately used as the lining material 7.

Since the second embodiment is a tomb as described above, when a heavy floor impact force is applied onto the floor finishing material 8, the air in the underfloor space 5 flows through the through holes 21 of the panel material 2 and onto the panel material 2. After flowing into the space 9, the air is diffused horizontally through the space 9, so that, similarly to the first embodiment, an instantaneous increase in air pressure in the underfloor space 5 during a heavy floor impact is prevented. .

As mentioned above, in the second embodiment, it is not necessary to lay the breathable floor finishing material 8 on the floor panel material 2, so the floor finishing material 8 can be wooden flooring material, carpet material, or Cushion flooring materials or the like may be used as appropriate.

FIG. 6 shows a modification of the double floor structure according to the second embodiment, which differs from the second embodiment in that the floor covering material 7 is not laid, and instead of the floor finishing material 8. As shown in FIG. 7, slit-shaped cutouts 81 are provided at appropriate locations along the length of the floor finishing material 8. As shown in FIG. Therefore, in this modification, the space 9 on the panel material 2 and the indoor space above the floor finishing shed 8 communicate through the cutout 81.

Since this modification has the above structure, when a heavy floor impact force is applied to the floor finishing material 8, the air in the underfloor space 5 flows out into the space 9 as in the second embodiment. After being diffused, it is released into the indoor space through the cutout 81 of the floor covering material 8. Therefore, an instantaneous increase in air pressure in the underfloor space 5 at the time of a heavy floor impact is more reliably prevented.

In this modification, the lining material 7 was not laid, but instead, the lining material 7 was laid with gaps, and a breathable floor finishing material was provided to cover the gaps and The space 9 may be communicated with the indoor space through a finishing material.

Further, although the above-mentioned first and second embodiments are not limited in their uses, the floor structure in which the floor finishing material 8 is not laid on the floor panel 2 is such that a mechanical device or the like is installed on the floor surface. It is preferable to apply it in cases.

Further, when the floor structure according to the first embodiment is employed in an apartment complex or the like, it is preferable to lay a floor finishing material such as a breathable fiber card carpet on the panel material 2.

Further, when a non-breathable material such as a wooden floor material is used as the floor finishing material 8, the floor structure of the second embodiment or the modified example is preferable.

Furthermore, in apartment complexes, etc., a floor structure is adopted in which the floor panel is supported through support legs equipped with elastic bodies that do not buckle due to floor impact force at the peripheral edge of the floor, and in other areas. The double floor structure according to the first and second embodiments and modifications may also be adopted. In this way, the floor surface will not sink even when long-term loads such as furniture are applied to the peripheral edge of the floor, while effectively preventing floor impact noise when impact force from a weight or lightweight body is applied to other parts. I can do it.

Hereinafter, a sound insulation performance test for heavy floor impact sound and light floor impact sound conducted to evaluate the present invention will be described.

First, as a first specific example, a double bed structure as shown in FIG. 1 and described below was prepared. That is, as the floor base 1, a concrete floor slab with a thickness of 150 mm was used, and as the panel material 2, the thickness was 40 mm and the size was 900 m.
mX900mm, diameter of through hole: 2Qmm, pitch nearer of through hole 5mm.

The rubber-like elastic body 31 used had 64 through holes (including 4 holes for attaching the support legs), had an overall height of 50 mm, and had a vertical and horizontal surface. It has a cross-sectional shape with an outwardly protruding hollow compression part in the middle part,
The width of the upper end surface is 40rr+m.

The width of the compression part is 45 mm, the width of the lower end surface is 50 mm, the thickness of the left and right rising parts of the compression part: 1O10n1 each, the height of the hollow part: 30 mm, the width of the hollow part: 25 mm, and the underfloor space 5 The height was set to 150 mm.

Further, as a second specific example, a double floor structure as shown in FIG. 5 and described below was prepared. That is, the subfloor 1,
Regarding the height of the rubber-like elastic body 31 and the underfloor space 5, the first
Same as the specific example, thickness of panel material 2: 20m
m, the pitch and number of through holes are the same as in the first specific example, the wood joists 6 are made of wood with a thickness of +12 mm, the lining material 7 is plywood with a thickness of +12 mm, and the floor finishing material 8 is made of plywood with a thickness of +12 mm. A wooden floor finishing material with a thickness of +16 mm was used.

Further, as a first comparative example, a double bed structure as shown in FIG. 8 and described below was prepared. That is, on the same flooring a as in the first specific example, thickness: 5Qmm, density: 6
A panel material d similar to that of the first specific example is laid down via support legs C equipped with an elastic body made of a 4 kg/m3 glass wool mat with dimensions of 100 mm x 100 mm. Lay similar wooden joists e1, lining materials f, and floor finishing materials g in sequence to increase the height of the underfloor space to 150 mm.
It was set to mm.

Further, as a second comparative example, a double bed structure as shown in FIG. 9 and described below was prepared. That is, a panel similar to that of the first specific example is placed on the same floor substrate a as that of the first specific example, via a support leg C having a truncated cone-shaped elastic body made of rubber with a rubber hardness of 0 degrees. Lay the material d, and lay the second panel material d on top of the panel material d.
Wooden joists e1, pile materials f, and floor finishing materials g similar to those in the specific example were laid one after another, and the height of the underfloor space was set to 150 mm.

Furthermore, as a third comparative example, a double bed structure as shown in FIG. 10 and described below was prepared. That is, a panel material J having no through-holes is placed on a floor base a similar to that of the first specific example, via a support leg C having a rubber-like elastic body l similar to that of the first specific example. On top of the panel material j, a lining material f and a floor finishing material g similar to those of the second specific example were sequentially laid down, and the height of the underfloor space was set to 150 mm.

When comparing the stability of the floor surface by placing a load of 100 kgf (sand bag) on the floor surface for each of the above specific examples and comparative examples, it was found that in the first comparative example, the elastic body made of glass wool mat was compressed and the floor The surface had a sinking of 5 mm and the stability was poor, whereas the first and second specific examples and the second and third comparative examples each had a sink of 1.3 mm.
In all cases, there were no problems with the feeling of walking on the floor and the stable placement of furniture.

FIG. 11 shows the results of a soundproofing performance test in which a floor impact sound level test was conducted based on the provisions of JIS-A-1419 for the first specific example and the second and third comparative examples. According to the structure, the soundproofing performance of heavy floor impact sound is LH-53.
The third comparative example has a soundproofing performance for heavy floor impact sound of LH-51, while the structure of the first specific example has a soundproofing performance for heavy floor impact sound of LH-45, which is not applicable to the present invention. It was confirmed that the double floor structure has excellent soundproofing performance against heavy floor impact noise.

FIG. 12 shows the relationship between the height of the underfloor space and the floor impact level in the second specific example and the third comparative example. In the third comparative example, the soundproofing performance decreased as the height of the underfloor space decreased, and when the underfloor space was 150 mm, the weight floor impact sound level was LH-51, and relatively good soundproofing performance was obtained. However, when the underfloor space was 50 mm, the soundproofing performance of LH-57 decreased rapidly. On the other hand, in the second specific example, the change in the height of the underfloor space has only a slight effect on the soundproofing performance, and the soundproofing performance is low in the range of underfloor space: 50 to 200 mm at the weight floor impact sound level: LH -45, confirming that the double floor structure according to the present invention has excellent soundproofing performance even when the underfloor space is low.

(Effects of the Invention) As explained above, according to the invention of claim (1), the support leg has a panel material having a large number of through holes and a rubber-like elastic body that can be buckled and deformed under a compressive load on the underfloor surface. Since the floor panels consisting of the
The air in the underfloor space flows out to the above-floor space and the instantaneous increase in air pressure in the underfloor space is suppressed, so the transmission of impact force from the support legs and the increase in air pressure in the underfloor space are simultaneously eliminated, reducing the weight of the heavy floor. The soundproofing performance against impact noise is significantly improved.

In addition, even if the height of the underfloor space is lowered, the soundproofing performance does not change drastically, and stable soundproofing performance can be achieved. Furthermore, since it is not necessary to use an elastic body that is particularly easily deformed in order to improve the soundproofing performance in the event of a heavy floor impact, walkability and safety are also ensured in the event of a light floor impact, such as when walking.

According to the invention of claim (2), in addition to the invention of claim (1), a plate-like body is provided on the floor panel and communicates with the underfloor space through a through hole in the panel. Because it is installed through a spacer to form a space, when a gravimetric impact force is applied, the rubber-like elastic body buckles and deforms to absorb the impact, and the air in the underfloor space flows into the space above the floor panel. Since the air flows out to the floor and diffuses, the instantaneous increase in air pressure in the underfloor space is suppressed. For this reason, even if the floor is finished using a board material with poor air circulation, such as wood flooring or plywood, the air circulation in the underfloor space will still occur in the space above the floor panel. Similarly, the soundproofing performance during heavy floor impact is significantly improved, and stable soundproofing performance is achieved even if the height of the underfloor space changes, and the floor surface sinks less during light floor impact, making it easier to walk. safety and safety are also ensured.

[Brief explanation of the drawing]

1 to 4 show a floor structure according to a first embodiment of the present invention, in which FIG. 1 is a sectional view, FIG. 2 is a plan view, FIG. 3 is a perspective view of the support legs, and FIG. (a) and (b) are front views showing the function of the support legs, respectively. Fig. 5 is a partially cutaway perspective view showing the floor structure according to the second embodiment of the present invention, and Figs. 6 and 7. shows a floor structure according to a modification of the second embodiment, FIG. 6 is a partially cutaway perspective view, FIG. 7 is a perspective view of the panel material, and FIG. 8 is a floor structure according to the first comparative example. 9 is a sectional view of the floor structure according to the second comparative example, FIG. 10 is a sectional view of the floor structure according to the third comparative example, and FIG. 11 is a sectional view of the first specific example and the first and third comparisons. Figure 12 is a diagram showing the results of the heavy floor impact sound conducted for the example. Figure 12 is a diagram showing the relationship between the height of the underfloor space and the level of heavy floor impact sound in the second specific example and the third comparative example. FIG. 2 is a diagram showing the relationship between the load and the amount of deformation of the elastic body per one support leg. Floor base 1... Floor base 2... Panel material 3... Support legs 4... Floor panel 5... Underfloor space 6... Wooden joist material (spacer) 7... Layout material (Plate-shaped body) 8...Floor finishing material 9...Space 1...Through hole 1...Rubber-like elastic body

Claims (2)

[Claims] (1) Height-adjustable panel material with a large number of through holes penetrating the upper and lower surfaces, and a rubber-like elastic body attached to the lower surface of the panel material and having a shape that can be buckled and deformed by compressive load at the lower end. A floor panel consisting of a plurality of supporting legs is
A double floor structure characterized by being connected to a subfloor made of concrete floor slabs, etc. (2) Height-adjustable panel material with a large number of through holes penetrating the upper and lower surfaces, and a rubber-like elastic body attached to the lower surface of the panel material and having a shape that can be buckled and deformed by a compressive load at the lower end. A floor panel consisting of a plurality of supporting legs is
A plate-like body is installed in parallel on a subfloor consisting of a concrete floor slab or the like so as to form an underfloor space between the subfloor and the subfloor, and a plate-like body is placed between the floor panel and the through-hole of the panel. A double floor structure characterized in that the floor space is laid through a spacer so as to form a space communicating with the underfloor space.