JPH0240184Y2 - - Google Patents

Description

[Detailed explanation of the idea]

This invention aims to provide a floor structure for concrete houses that has excellent floor stability and exhibits good sound insulation performance against impact loads. Conventionally, in order to improve the heat and sound insulation properties of concrete house floor structures, glass wool has been spread between the concrete slab and the mortar layer on the surface, or boards made of foamed polyethylene or foamed polystyrene have been interposed. However, when covered with glass wool, it has excellent sound insulation against impact loads, but
The problem was that the static load from furniture etc. caused the floor to sink, making the floor unstable. In addition, when a foam board is used, problems such as sinking of the floor surface, which occur when glass wool is spread, can be avoided, but the problem is that the sound insulation effect against impact loads is poor. in this way,
Both glass wool and foam board have their advantages and disadvantages, and there has been a demand for a floor structure that combines the advantages of both. In view of the above, this invention provides a floor structure for concrete houses that not only ensures floor stability but also has excellent sound insulation.The structure consists of a concrete slab and a mortar layer on the surface. A plate-like body made of hard foam is interposed between the plates, and support legs made of soft foam are incorporated at predetermined intervals on the back side of the plate-like body up to the middle of the thickness of the plate. The plate-shaped body is supported by the legs in a state slightly floating above the surface of the concrete slab. Next, embodiments of this invention will be illustrated below with reference to the drawings. 1 is a concrete slab, and leveling mortar 10 is applied to the upper surface. Reference numeral 2 denotes a plate-shaped body made of a hard foam, such as expanded polystyrene, which is interposed between the mortar layer 4 serving as the floor surface and the concrete slab 1. On the back side, plates are arranged at predetermined intervals. A support leg 3 made of soft foam is incorporated up to the middle of the thickness. This support leg 3
is incorporated so as to project slightly (preferably about 10 to 20 mm) downward from the bottom 21 of the plate-like body 2, and supports the plate-like body 2 in a state where it is floating above the surface of the concrete slab. That is, the plate-shaped body 2 is configured so that it can sink slightly downward due to the elastic contraction of the supporting legs 3, and when a large load is applied, its bottom 21 comes into contact with the concrete slab 1. , the structure is such that excessive subsidence is regulated. As the soft foam forming the support leg 3, foamed polyethylene,
Foamed polyurethane, foamed polyolefin, etc. are suitable. In addition, the joints of the plate-shaped bodies 2 are connected with tape or the like without any gaps, which prevents surface mortar from entering the back side of the plate-shaped bodies 2 during construction. According to the above, the thicker the support leg 3 is, the less impact is transmitted to the concrete slab 1. It is preferable to form a support leg 3 and increase the thickness of the support leg 3 accordingly. In this case, the sound insulation performance is even better (see FIG. 3). In addition, in this example,
A beam-shaped mortar layer 4' is formed in a position corresponding to between the supporting legs 3, 3. Further, the supporting legs 3 may be continuous as shown in FIG. 2, or may be segmented as shown in FIG. 4. Next, Table 1 shows the measurement results of the floor impact sound level using the floor structure of this invention. 3, and the strain rate (hereinafter referred to as the apparent spring constant) for the thickness of the support leg 3 when a load of 120 kg/m ² is applied to the plate member 2 is 1.0% to 30%. The measurement results of the impact sound level in the area were compared with the case where glass wool was spread under the same conditions to determine the quality of the sound insulation. According to these results, the apparent spring constant of the support leg 3 was 1.3. In the implementation results in the range of ~30%, it was confirmed that a good sound insulation effect could be obtained.

[Table] Test conditions (1) Underfloor structure Same structure as the floor structure shown in Figure 1 Thickness of mortar layer 4 50mm Thickness of plate 2 50mm Thickness of supporting legs 50mm Amount of floating of plate 2 15mm Floor area 3400×2550mm Thickness of concrete slab 150mm (2) Measurement position L1, L2, L3, points shown in Figure 5 (3) Material of plate 2 Expanded polystyrene (4) For other measurement methods, refer to JIS A1418-1978
(Method for measuring floor impact sound levels at building sites) Regarding glass wool, 25mm thick glass wool was spread at 64Kg/ ^m3 . Figures 6 to 10 show the measured values of the floor impact sound levels in the case of the glass wool and the case of the glass wool. Figure 6 is #1 above
Figure 7 shows the measured values for #2.
FIG. 8 shows the measured values for #3, FIG. 9 shows the measured values for #4, and FIG. 10 shows the measured values for glass wool. This device is constructed as described above, and supports legs 3 made of soft foam are placed at predetermined intervals on the back side of a plate-like body 2 made of hard foam interposed between a concrete slab 1 and a mortar layer on the surface. The floor structure is built into the middle of the thickness and supports the plate-shaped body 2 slightly above the surface of the concrete slab with the support legs 3, so it has excellent sound insulation and heat insulation properties, and is resistant to elastic contraction caused by the support legs 3. This means that impact loads can be effectively absorbed. In addition, for particularly large static loads, the bottom 21 of the plate-shaped body 2 comes into contact with one surface of the concrete slab, which prevents the floor from sinking more than necessary, making the floor unstable due to the installation of furniture, etc. In addition to this, it is also possible to prevent the support leg 3 from becoming sagging, and the vibration-proofing effect can be maintained for a long period of time. Moreover, since the supporting legs 3 are incorporated halfway through the thickness of the plate-like body 2, the sufficient height of the supporting legs 3 can be secured.
The elastic properties of the soft foam can be effectively utilized, and the above-mentioned vibration-proofing effect can be very effectively exhibited, and at least the surface side of the plate-shaped body 2 is made of a uniform layer of hard foam, resulting in a sound-insulating effect. can be demonstrated even better. In particular, when the hard foam is a foam with closed cells such as expanded polystyrene, it is possible to prevent mortar from penetrating below the plate-shaped body 2 during construction.
There is no fear that the gap formed between the plate-like body 2 and the concrete slab 1 at the support leg 3 will be blocked by mortar penetration. Therefore, as a floor structure for concrete houses, it has an excellent sound insulation effect especially against large impact loads, and
This means that it is possible to provide a product that exhibits various excellent practical effects, such as excellent floor stability and durability, and easy installation under the floor.

[Brief explanation of the drawing]

The figures illustrate an embodiment of this invention, in which Figure 1 is a sectional view, Figure 2 is a perspective view of a plate-like body,
Figure 3 is a sectional view of a modified example, Figure 4 is a perspective view of another modified example, Figure 5 is a plan view showing the measurement position of the floor impact sound level, and Figures 6 to 10 are floor impact It is a graph diagram showing measured values of sound level. 1... Concrete slab, 2... Plate body, 3
...Support leg, 4...Mortar layer.

Claims (1)

[Claims for Utility Model Registration] 1. A plate-shaped body made of a hard foam is interposed between a concrete slab and a mortar layer on the surface, and the back side of the plate-shaped body is provided with plate thickness at predetermined intervals. A floor structure for a concrete house, characterized in that a support leg made of soft foam is incorporated partway, and a plate-shaped body is supported by the support leg in a state slightly floating above the surface of a concrete slab. 2 The strain rate relative to the thickness of the support leg is
1.3-30% under load of 120Kg/ ^m2
The floor structure of a concrete house according to claim 1 of the above-mentioned utility model registration claim. 3. The concrete house according to claim 1 of the above utility model registration claim, wherein the plate-shaped body has a convex portion projecting upward at a position corresponding to the upper part of the support leg in order to ensure the thickness of the support leg. floor structure. 4. The floor structure of a concrete house according to claim 1 of the above utility model registration, wherein the supporting legs are made of foamed polyurethane or foamed polyolefin. 5. The floor structure of a concrete house according to claim 1 of the above utility model registration claim, wherein the plate-like body is made of expanded polystyrene.