JPH0645963B2 - Floating floor structure - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a floating floor structure, and more particularly to a floating floor structure having an excellent sound insulation effect and excellent water resistance.

Technical background of the invention and its problems In recent years, Western-style rooms that do not use tatami mats have been favored over Japanese-style rooms over Japanese-style houses. Along with that,
Building materials are also made of thin and strong materials.

Since thin and strong building materials are often used in Western-style rooms that do not use tatami mats, the sound of children bouncing indoors, the sound of footsteps in the room, and the noise generated when moving furniture etc. are generated inside the house. There is an increasing need for measures against noise caused by noise or noise such as walking noise in corridors and stairs. Countermeasures against such noise are particularly important in concrete high-rise apartment houses such as public housing and private condominiums.

As a measure against noise in such a concrete-based medium-high-rise apartment house, it is known that, for example, the concrete slab floor can be thickened to increase the mass and reduce the natural frequency of the concrete slab that causes noise. But
This method is not preferable because it has a problem of earthquake resistance, construction costs are high, and it goes against the recent trend of weight reduction of buildings.

Therefore, on the concrete slab floor, glass wool,
A method of laying a cushioning material such as rock wool and adopting a floating floor structure in which a concrete floating floor layer is provided on the cushioning material has been proposed. Among them, the floating floor structure using glass wool as a cushioning material is an excellent floating floor structure because glass wool has excellent dimensional stability, durability, and heat resistance, but it has the following problems. It was That is, as shown in FIG. 5, when there is a convex portion 12 on the concrete slab 1 on which the cushioning material 2a made of glass wool is laid, the concrete slab and the floating floor layer 3, which is also a cement product, come into direct contact at this portion. In some cases, a sound bridge or acoustic bridge (sound bridge) was formed at this contact portion, and the sound insulation effect was significantly reduced. Therefore, before laying the cushioning material 2a made of glass wool on the concrete slab 1, the protrusions 12 on the concrete slab 1 must be removed in advance, which is troublesome. Also slab floor 1 to sidewall 4
As shown in FIG. 6, the glass wool cushioning material 2a and the glass wool rising insulating material 2b must be abutted against each other at the wall where the abutment rises.
There was a problem that a gap was created in 3 and a sound bridge was formed, and the sound insulation effect was likely to deteriorate.

In order to solve such problems, there have been attempts to use expanded polystyrene as a cushioning material, but expanded polystyrene itself is too hard as a cushioning material for sound insulation and is a satisfactory dynamic spring per unit area. It did not have a constant and could not be a cushioning material showing excellent performance. For this reason, it has been proposed to use expanded polystyrene obtained by compressing expanded polystyrene to destroy a part of the expanded cells as a cushioning material, but this method requires that the expanded polystyrene be compressed in advance, resulting in product variations. However, there is a problem in that it is liable to occur and it takes time and effort for molding, and at the wall of the slab floor, the above-mentioned problem that the cushioning material and the rising insulating material still have to be abutted remains.

Object of the Invention The present invention is intended to solve the problems associated with the above-described conventional techniques all at once, and has the following objects.

(A) To provide a floating floor structure having an excellent sound insulation effect in which a sound bridge is less likely to be formed even if the concrete slab floor has a convex portion and the convex portion does not directly contact the floating floor layer. .

(B) The cushioning material and the rising insulation material can be integrally formed so that it is not necessary to abut the cushioning material and the rising insulation material at the wall where the side wall rises from the concrete slab floor,
Therefore, to provide a floating floor structure having an excellent sound insulation effect.

(C) To provide a floating floor structure that has low water absorption and water permeability and can therefore be used on rooftops or stairs exposed to rainwater.

SUMMARY OF THE INVENTION The floating floor structure according to the present invention is a floating floor structure in which a floating floor layer is laid on a concrete slab floor via a buffer layer composed of a cushioning material and a rising insulating material. Formed from expanded polypropylene having a thickness of 25 to 60 mm and a dynamic spring constant per unit area of 0.8 to 4.8 × 10 ⁶ N / m ³ measured under a load mass of 250 kg / m ^2. It is characterized by being.

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to Examples shown in the drawings.
The same members as those shown in FIG. 6 and FIG. 6 are designated by the same reference numerals.

In the floating floor structure according to the present invention, a buffer layer 2 as described below is laid on a concrete slab floor 1 as shown in the schematic sectional view of FIG. A floating floor layer 3, which is a product, is laid.

The buffer layer 2 is composed of a buffer material 2a and a rising insulating material 2b rising from the end portion along the side wall.

The cushioning material 2a forming the cushioning layer 2 is made of expanded polypropylene having a thickness of 25 to 60 mm.

Foamed resins having a cushioning effect in the general sense include foamed polystyrene, foamed polyurethane, foamed polyethylene, etc., but a combination of hardness and softness is important for use as a cushioning material for floating floor structures. Become.

That is, a heavy object such as a piano may be placed on the floating floor for a long period of time, and even if such a heavy object is installed for a long period of time, it is necessary to have a hardness that prevents the floating floor itself from sinking. However, from the viewpoint of absorbing vibration as a cushioning material, the softer one is preferable.

As a concrete example, expanded polystyrene having the same expansion ratio as polypropylene is too hard as a cushioning material and cannot be used as it is as a cushioning material in the present invention.
If such expanded polystyrene is to be used as a cushioning material, it is necessary to compress the expanded polystyrene and then release the pressure to break the closed cells existing in the expanded polystyrene. Normally, when expanded polystyrene is compressed to a volume of about 1/3, most of the closed cells are destroyed and the partition walls are destroyed, and the cells are continuous, so that the expanded polystyrene is considerably softened and a good cushioning effect is exhibited. The creep resistance is reduced, and if a heavy object is left for a long period of time, the floating floor in that part will settle.

The polystyrene foam exhibits the above-mentioned properties because the polystyrene is a hard resin, and the foam wall of the resin foam formed of these resins has almost no flexibility and the foam itself does not deform. This is because it is too hard as a cushioning material.

Further, for example, expanded polyethylene having the same expansion ratio as polypropylene is too soft on the contrary and has low creep resistance, and therefore only those having a low expansion ratio can be used as a cushioning material.

On the other hand, since polypropylene itself has elasticity, the closed cells of the foam formed from this polypropylene have flexibility and the foam itself has good creep resistance. Of. Moreover, polypropylene can be used to manufacture resin foams and is inexpensive.

In the present invention, for the above reasons, as the cushioning material,
Expanded polypropylene is used from various resins.

In the present invention, the buffer layer made of expanded polypropylene as described above has a thickness of 25 to 60 mm.

Generally, the thicker the cushioning material, the higher the cushioning effect,
For example, in the case of a lightweight impact sound, the impact sound is reduced by about 3 dB when the thickness of the cushioning material is doubled. However, the thickness of this cushioning material has construction restrictions, and there is an upper limit in terms of manufacturing and cost.

That is, in order to produce a resin foam from polypropylene as described above, an extrusion foam molding method or the like is usually used, but polypropylene has a characteristic that it is difficult to produce a thick foam. Usually, the cushioning material is used as a single layer or as a laminate of two layers, but the thickness of the foamed polypropylene that can be manufactured is limited to about 25 mm. Therefore, when laminating and laying a cushioning material using such a foamed polypropylene, it is common to laminate the foamed material into about two layers in terms of work efficiency, and the thickness of the foamed polypropylene thus laminated is about 50 mm, which is thick. Even less than 60mm. Even if a foamed polypropylene having a thickness of 60 mm or more is used as a cushioning material in a general house, construction is difficult and the risk of deterioration of the cushioning performance due to improper construction exceeds the improvement of cushioning performance by stacking cushioning materials. There is no positive meaning in laying a thick cushioning material.

Further, the height of the convex portion on the concrete slab forming the sound bridge is usually 25 mm or less, and therefore, the thickness of the cushioning material needs to be 25 mm or more in order to prevent the formation of the sound bridge. .

The cushioning material 2a formed of expanded polypropylene having the above thickness has a dynamic spring coefficient per unit area of 0.8 to 4.8 measured under a condition of a load mass of 250 kg / m ^2.
It is in the range of × 10 ⁶ N / m ³ . That is, the cushioning material 2a
Is formed of expanded polypropylene having a thickness of 25 to 60 mm, and the expanded polypropylene of this thickness, that is, the cushioning material 2a has a dynamic spring coefficient of 0.8 to 4.8 × 10 ⁶ N / m ^3. I am doing it.

The dynamic spring constant per unit area measured under the condition that the load mass of the cushioning material 2a is 250 kg / m ² is 0.8 × 10 ⁶ N / m ³
If it is less than 4.8 × 10 ⁶ N / m ³ or more, it is not preferable because the cushioning performance of the floating floor is deteriorated and a sufficient sound insulating effect cannot be obtained.

Since the cushioning material 2a is made of the above-mentioned expanded polypropylene, it is extremely easy to form the cushioning material 2a into a desired complicated shape as compared with glass wool, rock wool and the like. That is, for example, as shown in FIG. 2 (a), it is possible to integrally form a cushioning material 2a that is in direct contact with the concrete slab floor 1 and a rising insulating material 2b that is in contact with the side wall 4 rising from the concrete slab floor. In this respect, the problem that the cushioning material 2a and the rising insulating material 2b are not sufficiently butted at the wall side and a sound ridge is formed to reduce the sound insulation effect is completely solved. In some cases, FIG. 2 (b)
As shown in FIG. 5, units 5a and 5b in which a rising insulating material 2b that rises along the side wall is erected at one end of the cushioning material 2a are prepared, and the units 5a and 5b and the plate-shaped cushioning material 5c are combined. Thus, the buffer layer 2 can also be used. By doing so, the cushioning material used in the present invention can be easily laid in a room of various sizes. Further, in some cases, as shown in FIG. 2 (c), the cushioning material 2a and the rising insulating material 2b may be molded as separate bodies and combined when laid on the concrete slab 1.
However, in this case, the abutting portion 13 between the cushioning material 2a and the rising insulating material 2b is generated, and a sound bridge may be generated at this portion as in the conventional example, which is not so preferable in this sense. .

Further, particularly, when the flat plate portion 5c of the cushioning material 2a as shown in FIG. 2 (b) is connected by providing the notch 4 as shown in FIG. 2 (d), a sound bridge is formed at this connection portion. The sound insulation effect is effectively prevented from being lowered.

In the present invention, the cushioning material 2a needs to have a specific dynamic spring constant, but it is preferable that the rising insulating material 2b is also integrally formed of the same material as the cushioning material 2a. Therefore, the rising insulating material 2b is also the cushioning material 2a.
It is preferable to have a specific dynamic spring constant as well. The rising insulating material 2b usually has a thickness of 10 mm or more, preferably 25 to 50 mm.

Since the cushioning material 2a is formed of expanded polypropylene having a specific dynamic spring constant as described above, even if the concrete slab floor 1 has some convex portions 12, it can be deformed by conforming to the convex portions. The direct contact between the concrete slab floor 1 and the floating floor layer 3 is prevented,
No sound bridge is formed on the convex portion 12 of the concrete slab floor 1, and a floating floor structure having an excellent sound insulating effect can be obtained.

Further, the foamed polypropylene used as the cushioning material 2a has low water absorption and water permeability, and therefore can be used for a rooftop or stairs exposed to rainwater.

The floating floor layer 3 laid on the cushioning material 2a is preferably a cement product such as mortar, concrete, lightweight concrete or a stone material. In the case of mortar concrete, its thickness is usually 50 mm or more, preferably 6
The thickness is 0 mm or more, and in the case of lightweight concrete, the thickness is usually 60 mm or more, preferably 100 mm or more.
It is preferable that the floating floor layer 3 has a certain thickness or weight as described above, and if a floating floor layer having a thickness less than the above range is used, the performance as a floating floor decreases and the sound insulation is achieved. The effect is not sufficiently observed, which is not preferable.

In the floating floor structure according to the present invention, on the floating floor layer 3,
If desired, a finishing material 6 such as carpet or tatami mat may be laid.

In addition, the floating floor layer 3 laid on the cushioning material 2a
It is preferable to lay a waterproof layer (not shown) such as a polyethylene sheet on the upper surface of the cushioning material 2a in order to prevent a slag, such as concrete, that forms the slag from flowing in. Furthermore, in order to prevent moisture from the concrete slab floor 1,
A polyethylene sheet is provided between the concrete slab floor 1 and the cushioning material 2a, and between the side wall 4 and the rising insulating material 2b.
A waterproof / moisture-proof layer (not shown) such as aluminum kraft paper may be interposed.

Further, in order to prevent cracks from occurring in the floating floor layer 3, a welded wire mesh (not shown) is provided in the floating floor layer 3.
It can also be reinforced by reinforcing the bar. In FIG. 1, 7 is a finishing wall, 8 is a joint bar, and 9
Is a skirting board.

As described above, the floating floor structure according to the present invention can be used for a rooftop or stairs exposed to rainwater because the cushioning material has low water absorption and water permeability. However, description of applying this floating floor structure to stairs A sectional view is shown in FIG. When the floating floor structure according to the present invention is applied to the stage, the structure is basically the same as that shown in FIG. 1, and the cushioning material 2a and the rising insulation material 2b are provided on the concrete slab floor 1. An integrally formed buffer layer 2 is provided, and a floating floor layer 3 which is a stone material or a cement product is provided so as to be fitted in a space surrounded by the buffer layer 2, and a step portion of the stairs. An anti-slip 10 and a cover 11 are provided in the case as required.

FIG. 4 shows an explanatory sectional view when the floating floor structure according to the present invention is applied to a rooftop. Also in this case, the buffer layer 2 in which the buffer material 2a and the rising insulating material 2b are integrally formed is provided on the concrete slab floor 1 via the waterproof layer 12, and is surrounded by the buffer layer 2. A floating floor layer 3 made of concrete or the like is provided so as to be fitted into the space, and a cover 11 is provided as necessary in a portion where the buffer layer 2 is exposed. In the above description, the cushioning material 2a and the rising insulating material 2b are integrally formed, but the cushioning material 2a and the rising insulating material 2b may be separately formed.

Effects of the Invention In the floating floor structure according to the present invention, the cushioning material is formed of expanded polypropylene having a specific thickness, and the cushioning material having this thickness has a specific dynamic spring constant.
Even if the slab floor has a convex portion, this cushioning material can be deformed according to the convex portion, so that the concrete slab floor and the floating floor layer do not come into direct contact with each other, thus forming a sound bridge. It is possible to obtain a floating floor structure that is hard to be damaged and has an excellent sound insulation effect.

Further, since the above-mentioned cushioning material is formed of expanded polypropylene, it can be easily molded into an arbitrary shape. Therefore, the cushioning material and the rising insulating material that rises at an angle of approximately 90 ° from this cushioning material are used. Can be integrally formed, and therefore, it is possible to eliminate the need to abut the cushioning material and the insulative insulating material at the side wall where the side wall rises from the slab floor, and in this case, the sound bridge at the abutting portion. The formation of the floating floor can be prevented, and a floating floor structure having an excellent sound insulation effect can be obtained from this aspect as well.

Furthermore, since the above-mentioned cushioning material made of expanded polypropylene has low water absorption and water permeability, it can be used for floating floor structures such as rooftops, stairs, dance halls and terraces exposed to rainwater.

[Brief description of drawings]

FIG. 1 is a sectional view of a floating floor structure according to the present invention.
(A)-(d) is sectional drawing which shows the combination of the cushioning material which forms a cushioning layer, and a rising insulating material, and FIG.
FIG. 5 is a cross-sectional view showing another embodiment of the floating floor structure according to the present invention, and FIGS. 5 and 6 are explanatory views of defects in the conventional floating floor structure. 1 ... concrete slab, 2 ... buffer layer, 2a ... buffer material, 2b ... rise insulation material, 3 ... floating floor layer, 4 ... side wall.

Claims (3)

[Claims] 1. A floating floor structure in which a floating floor layer is laid on a concrete slab floor via a buffer layer composed of a cushioning material and a rising insulating material, wherein the cushioning material has a thickness of 25 to 60 mm. And having a dynamic spring constant per unit area of 0.8 to 4.8 × 10 ⁶ N / m ³ measured under a load mass of 250 kg / m ² Floating floor structure. 2. The floating floor structure according to claim 1, wherein the cushioning material and the rising insulating material are integrally formed. 3. The buffer material according to claim 1, wherein an end portion of the buffer material has a connecting portion such as a phase cutout structure and is joined to an adjacent buffer material by the joint portion. Floating floor structure.