JPH0546417B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a floor structure in a concrete building that is excellent in blocking noise such as impact sound and empty metal propagation sound. [Conventional technology] The floor structure of conventional concrete buildings is as follows:
For example, there are those shown in FIGS. 3 to 5. Fig. 3 shows the floor structure of a Western-style room, Fig. 4 shows the shape of the subfloor material in Fig. 3, and Fig. 5 shows the adhesion of the bonding material applied to the concrete slab with the subfloor material in Fig. 3. FIG. This floor structure consists of a concrete slab S, a bonding material M applied on the slab S in the form of islands at approximately constant intervals, and a bonding material M placed on top of the bonding material M and bonded to the concrete slab S. It consists of a foamed plastic flooring material B laid integrally with the flooring material F stretched over it. The above-mentioned bonding material M usually consists of mortar balls m and an adhesive. First, the adhesive is applied to the concrete slab, the mortar balls m are placed on top of that, and the adhesive is applied to the back side of the subfloor material B. There is. The floor base material B is made by laying unit base materials B as shown in FIG. 4 in a jointed manner. This unit base material b has, for example, a spring constant of 100×10 ⁶ N/m ³ measured in accordance with JIS A-6322, and JIS A-9511.
Compressive strength 1.2Kg/cm ² , thickness 50, measured in accordance with
It is a unit plate with a width of 600 mm and a length of 900 mm. On the front side, there are wood 1 for laying floor covering material buried at 450 mm intervals, and on the back side, piping grooves 2 for piping are provided vertically and horizontally. There is. The floor finishing material F is generally a wooden floor board and is installed by nailing. As shown in FIG. 5, the intervals between the bonding materials M applied in the form of islands are usually as follows for the above-mentioned unit base material b.
The number of mortar balls m per sheet, that is, the number of islands, is 16 to 20. This floor structure is excellent in terms of insulation, warmth, walking comfort, safety, and ease of construction of piping sections.
The sound insulation performance, especially the sound insulation performance against airborne sound, is poorer than that of a concrete slab alone (bare floor) that does not use a subfloor material. For this reason, there is a problem that if the volume of TV sound, stereo sound, etc. is increased in the room on the upper floor, the sound will propagate to the living room on the lower floor. This poor sound insulation performance is thought to be due to the fact that the superstructure, which is made up of a foamed plastic flooring material and floor finishing material on a concrete slab, causes a resonance transmission phenomenon in the frequency band of 250 Hz to 1 kHz. In addition, the sound insulation performance against floor impact noise is not good, and there is a drawback that the sound insulation performance against light impact noise is particularly poor in the case of wood-based finishing materials (plywood, scrapboard). I went to check this sound insulation performance level.
JIS A-1417-1974 (sound source room: height 2800mm x width
3670mm) and the sound insulation performance measured in accordance with JIS A-1418-1974 is shown in Table 3. As can be understood from the measurement results in Table 3, the sound pressure level difference between rooms at a center frequency of 500 Hz is reduced compared to a floor structure using conventional foamed plastic flooring material [] bare floor []. This worsens the sound insulation grade D value. This is thought to be because the foamed plastic flooring material B, which forms the space between the concrete slab S, mortar bonding material M, and floor finishing material F, acts as an elastic body and causes a resonance transmission phenomenon. . In addition, the D value of the floor structure [] mentioned for comparison is
50, which is good, but this is thought to be because the above-mentioned resonance transmission phenomenon does not occur. This floor structure [] has excellent sound insulation performance, but even if floor finishing material is applied as it is, the floor is too hard, making it uncomfortable to walk on, and it is dangerous to fall, making it extremely uncomfortable to live in. . [Specific means for solving the problem] In the present invention, a laminate is used in which a foamed plastic with higher elasticity is laminated on the lower surface of the foamed plastic conventionally used as a flooring material. By bringing the wood into contact with the surface of the highly elastic foamed plastic lower layer, which bears the heaviest load of the material, it provides a floor structure for concrete buildings that has an excellent sound insulation effect against impact sound and airborne sound. That is, the present invention provides a concrete slab;
In the floor structure of a concrete building in which a foamed plastic subfloor material is fixed onto the slab using a bonding material, and a floor finishing material of the subfloor material is stretched, the said subfloor material is A foamed plastic lower layer with a static spring constant of 30 x 10 ⁶ N/m ³ or less measured in accordance with JIS A-6322 (hereinafter sometimes referred to as a highly elastic foamed plastic layer), and a wooden A laminated structure with a foamed plastic upper layer (hereinafter sometimes referred to as a semi-rigid foamed plastic layer) with a compressive strength of 0.8 to 3 kg/cm ² measured in accordance with JIS A-9511. Another object of the present invention is to propose a floor structure for a concrete building, characterized in that the timbers reach from the surface of the upper layer to the surface of the lower layer. The present invention will be explained below using the drawings. In Figure 1, S is concrete slab, M is mortar, bonding material such as liquid resin adhesive, B is foamed plastic flooring material, 1 is wood, F ₁ and F ₂ are wall thickness 12
A floor finishing material made of veneer plywood of mm _.
is secured to the timber 1 by nails 3, and the floor covering material _F1 is secured to the waste board _F2 with nails or adhesive. This floor finishing material F ₁ may be a decorative flooring material other than lauan plywood. The bonding material M here is a material that fixes the subfloor material B to the concrete slab S, and may be a combination of adhesive and cement mortar, a polymer-containing cement adhesive, an epoxy adhesive, such as acrylic or ethylene.・Use an adhesive mixed with a vinyl acetate copolymer-based polymer dispersion. As shown in Fig. 1 and Fig. 2 A, this flooring material B has a static spring constant of 30 x 10 ⁶ N/m ³ or less, preferably 5 x
A lower layer b ₁ made of foamed plastic with a strength of 10 ⁶ N/m ³ to 20×10 ⁶ N/m ³ and an upper layer made of foamed plastic with a compressive strength of 0.8 to 3 Kg/cm ² measured in accordance with JIS A-9511.
B ₂ is made of a laminate, and the rod 1 contacts the surface of the highly elastic foamed plastic lower layer b ₁ from the surface of the semi-rigid foamed plastic upper layer b ₂ through the cross section of the upper layer b ₂ It is set up like this. In this example, the flooring material B is composed of one foamed plastic upper layer b ₂ and a foamed plastic lower layer b ₁ divided into a plurality of parts.
A space 5 is formed between it and the concrete slab S. This flooring material B is made of a semi-rigid foamed plastic upper layer b ₂ shown in FIG.
To integrate the three parts by fitting the wooden block 1 shown in Fig. C, and then fitting the highly elastic foamed plastic lower layer b ₁ shown in Fig. 2 D, whose surface is coated with liquid adhesive. It is obtained by The area located on the surface of the semi-rigid foamed plastic upper layer b ₂ of the log 1 is preferably smaller than the area in contact with the highly elastic foamed plastic lower layer b ₁ , and the shape is trapezoidal, convex, etc. good. By doing this, the wood is less likely to fall out than the subfloor wood. The liquid adhesive used to bond the upper layer B ₂ and the lower layer B ₁ includes solvent-based and emulsion-based liquid adhesives such as epoxy resins, urethane resins, unsaturated polyester resins, and acrylic acid ester/styrene copolymers. used. The materials for frame 1 are lauan and cypress (35kg/
cm ² ), zelkova (150 kg/cm ² ), Japanese toga, pine, cedar, etc. Synthetic wood (50
~150Kg/ ^cm2 ). In addition, the information in parentheses is
This is the compressive strength measured according to JIS Z-2111. The order of the spring constant of each foam is that the spring has the highest spring constant, followed by the semi-rigid foamed plastic upper layer, and then the more elastic foamed plastic lower layer. Impact sounds such as heavy floor impact sound and light impact sound transmitted from the floor finishing material F to the floor covering 1 are
is directly damped by the foamed plastic lower layer b ₁ with a small static spring constant, that is, with high elasticity, and this highly elastic foamed plastic lower layer b ₁ is connected to the concrete slab S by the bonding material M, so that the bonding The impact sound insulation properties are improved compared to the conventional concrete floor structure in which material M is in contact with semi-rigid foamed plastic flooring material _b2 . FIG. 6 is a cross-sectional view showing another embodiment of a concrete floor structure in which the waste board F ₂ of the floor finishing material is fixed to the floor base material B using nails 3 and adhesive 4. 7 to 11 are plan views showing other aspects of the flooring material B, and these flooring materials B are
are provided on one semi-rigid upper layer b ₂ made of foamed plastic, and each bar 1, 1 is provided with one or more lower layers b ₁ made of highly elastic foamed plastic.
The adjacent highly elastic foamed plastic lower layers b ₁ , b ₁ , b ₁ , b ₁ are separated from each other. This highly elastic foamed plastic lower layer b ₁ ,
Due to the separation of b ₁ , b ₁ , b ₁ ..., a space ₅ is created between the subfloor material B and the concrete slab S, and the piano Noises such as stereo sounds, voices, etc. that are transmitted through the space, through the walls and concrete slab S, and transmitted downstairs are attenuated. 7, 8, 9 and 11 show a subflooring material B in which the length of the timber is the same as the width or length of the highly elastic foamed plastic lower layer _b1 ; 10 and 11 show a through space 6 in which a hand or fingers can be inserted into the central part of a semi-rigid foamed plastic upper layer b ₂ which does not have a highly elastic foamed plastic lower layer b ₁ on its lower surface. has, and
Hollow spaces 7, 7, 7, 7 in which a hand or fingers can be inserted inward from the center of each side, which is a part that does not have a highly elastic foamed plastic lower layer b ₁ on the lower surface.
This shows a flooring material B having a structure in which at least one pair of . The presence of these spaces 6, 7, 7, 7, 7 makes the flooring material B more lightweight, and also allows for insertion of fingers and hands, making construction easier. Furthermore, the attenuation of airborne sound is improved. Each highly elastic foamed plastic underlayer
The distance between b ₁ and b ₁ is 5 to 30 cm, and if necessary, the space 5 may have a width and height that allow a heating pipe, a gas pipe, etc. to be laid. The thickness of the highly elastic foamed plastic lower layer _b1 of the flooring material B accounts for 20 to 500% of the thickness of the semi-rigid foamed plastic upper layer _b2 . The thickness of the highly elastic foamed plastic lower layer _b1 of the flooring material B is
10-100 mm, and the wall thickness of the semi-rigid foamed plastic top layer _b2 is 10-50 mm. The foamed plastic material constituting the lower layer b ₁ of the flooring material B includes high-density polyethylene, linear low-density polyethylene, polypropylene, propylene-ethylene copolymer, styrene-polyethylene copolymer, etc., with a bulk density of 8 to 8. A mold is filled with 40g of foamed material and pre-expanded polystyrene particles, and this is steam-foamed to form a foamed polystyrene molded product. After compressing the molded product, the compression ratio is 1/2.
The shape may be recovered to ~4/5, and then sliced in a plane direction perpendicular to the compression direction. In this example, the thickness is 410mm, the width is 900mm, and the length is
A 1000mm expanded polystyrene molded body is compressed in the thickness direction to 1/3 of its thickness, then the pressure is released to recover to 2/3, and then sliced in the plane perpendicular to the compression direction. The foamed polystyrene obtained by The static spring constant of the foamed plastic constituting the lower layer _b1 can be varied depending on the density of the foam before processing and the application conditions when the secondary processing of pressurization and release is performed as described above. Table 1 shows that foamed polystyrene with different densities and having a thickness of 410 mm, a width of 900 mm, and a length of 1800 mm are compressed to 1/3 of the thickness before compression, and then the pressure is released to 2/3. The recovered material is 50mm thick,
This figure shows the relationship between the density and spring constant of the unit flooring material _b1 obtained by cutting it into pieces of 600 mm in width and 900 mm in length.

[Table] The foamed plastic that makes up the upper layer _b2 is as follows:
Pre-foamed polystyrene, styrene/α-methylstyrene/acrylonitrile copolymer, ABS
A molded foamed product obtained by filling a mold with styrene-based resin particles such as styrene-based resin particles, foaming them by steam heating, and fusing them together can be used. The density of this thing is 15~
40g/ is preferable in terms of strength and heat insulation. In order to improve sound insulation performance, the present invention uses a foamed plastic lower layer with high elasticity, that is, a foamed plastic lower layer with a static spring constant of 30 × 10 ⁶ N/m ³ or less, and a conventionally used semi-rigid lower layer. It is characterized by the use of a subfloor material in combination with a foamed plastic upper layer. The static spring constant and compressive strength that indicate the properties of both layers are contradictory properties, one being softness and the other hardness, so if the static spring constant is 30 × 10 ⁶ N/m ³ Compressive strength is 0.8
Although a foam of ~3 Kg/cm ² was not obtained, the relationship between the two is shown in Table 2.

〔Example〕

As a semi-rigid upper layer b ₂ foamed plastic, the compressive strength is 1.2Kg/cm ² and the static spring constant is 100×
10 ⁶ N/m ³ and a bulk density of 25 g/m are used as the foamed plastic of the lower layer b ₁ with high elasticity, and the static spring constant is obtained by the following method.
10×10 ⁶ N/m ³ , compressive strength 0.15Kg/cm ² , bulk density
15g/foam was used. In addition, the cross section of the tree 1 is convex, and the height is
Expanded polystyrene extrusion molded product of 20mm, top side 40mm, bottom side 56mm (density 0.5g/cm ³ , compressive strength 90Kg/cm ² )
was used, and an epoxy resin was used as the adhesive. Manufacturing method for highly elastic foam Fill a mold with pre-expanded polystyrene particles, steam foam mold the material, and create a foam with a thickness of 410 mm and a width of 900 mm.
A foamed polystyrene block with a length of 1000 mm is made, and then this foamed polystyrene block is compressed to 1/3 of its thickness by applying pressure in the thickness direction, and then the pressure is released to allow it to recover to 2/3 of its thickness. Slice in the plane direction perpendicular to the compression direction, 200 mm long and 350 mm wide.
Four foams with a thickness of 50 mm and a thickness of 50 mm were produced. Example 1 Two depressions on the surface of a semi-rigid foamed polystyrene molded body _b2 having a joint structure measuring 595 mm in length, 900 mm in width, and 40 mm in height (distance from the side to the surface end of the depression) Direction 22.5mm, width direction 205mm, the cross section of the recess is convex, height 20mm, top side 40mm, bottom side
56mm, length 550mm) from the back side using epoxy adhesive, and then glue the four recesses on the back side (the distance between the recesses is 97.5mm in the vertical direction).
mm, horizontal direction 100 mm, dent size is vertical 200 mm, horizontal
350mm, depth 20mm), highly elastic foam b ₁
were adhered using an epoxy resin adhesive to obtain flooring material B. (See Figure 2 A) This flooring material B is used in the sound source room of a concrete building (floor area X x Y =
It was fixed onto a concrete slab S measuring 2800 mm x 3670 mm using cement mortar M, and then two sheets of plywood with a thickness of 12 mm were nailed to the timber 1 as a floor finishing material F to form a floor structure. Regarding the obtained floor structure, the level of floor impact sound was measured according to the method using a heavy floor impact generator of JIS A-1418, and the level of airborne sound was measured according to JIS A-1417, and the results are shown. Shown in 3. Example 2 Four depressions on the surface of a semi-rigid expanded polystyrene molded body _b2 measuring 595 mm in length, 900 mm in width, and 40 mm in height (distance from the side to the surface end of the depression: 22.5 in the vertical direction)
mm, 205 mm in the horizontal direction, the cross section of the recess is convex, the height is 20 mm, the upper side is 40 mm, the lower side is 56 mm, the length is 200 mm), a piece of wood with a length of 200 mm is glued, and the back side is made of highly elastic foam b Distance ₁ from the side: 48.75mm in the vertical direction,
The same procedure as in Example 1 was carried out except that the flooring material B (see Fig. 7) was used, which was adhered at a position of 50 mm in the lateral direction. The results are shown in Table 3. Example 3 Four cross-shaped depressions (from the sides) of 350 mm in width and 200 mm in height were formed on the surface of a semi-rigid foamed polystyrene molded body _b2 measuring 595 mm in length, 900 mm in width, and 40 mm in height. Distance to the surface edge of the part: 48.75 mm in the vertical direction, 50 mm in the horizontal direction, the cross section of the depression is convex, and the height is 20 mm, the top side is 40 mm, and the bottom side is
56mm), glue a piece of wood with the same shape as the recess, and cover the back side with highly elastic foam b ₁ from the side to the end.
Glue at a position of 48.75mm in the vertical direction and 50mm in the horizontal direction,
There is a cross-shaped space in the center of this panel with a width of 50 mm and a length of 250 mm, and a cross-shaped space with a width of 50 mm and a length of 150 mm in the center of each side.
Example 1 was carried out in the same manner as in Example 1, except that flooring material B (see FIG. 9) having a void space of mm was used. The results are shown in Table 3. Example 4 A width of 50 mm was placed in the center of the subfloor material B used in Example 2.
Same as Example 1 except that subflooring material B (see Fig. 11) was used, which had a cross-shaped space of 250mm in length and 50mm in width and 150mm in length in the center of each side. I went in the same way. The results are shown in Table 3. Comparative Example 1 Except for Example 1, except that the depth of the recess for embedding the timbers on the top surface of the subflooring material was 10 mm, and the timbers of a shape corresponding to that were used so that the timbers did not reach the surface of the lower layer. The same procedure as in Example 1 was carried out except that the same flooring material B was used. The results are shown in Table 3. [Effects] From Table 3, the floor structure of the present invention has a better sound insulation effect against both airborne sound and impact sound than bare floors () and floor structures using conventional foamed plastic flooring materials (). It is understood that this is superior.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the floor structure of the present invention, Fig. 2A is a plan view of the subfloor material, Fig. 2B is a back view of the upper layer made of semi-rigid foamed plastic, and Fig. 2C is a perspective view of the wood. Figure 2D is a perspective view of the lower layer made of highly elastic foamed plastic, Figure 3 is a sectional view showing the floor structure of a Western-style room in a conventional concrete building, and Figure 4 is a perspective view of the lower layer made of highly elastic foamed plastic.
Showing the flooring materials that make up the floor structure in the figure, A is a plan view from the front side, B is a plan view from the back side, C is a side view from the direction of arrow E in A, Figure D is a side view seen from the direction of arrow F in Figure A, Figure 5 is a plan view with the floor covering material in Figure 3 removed, and Figure 6 shows another embodiment of the present invention. Cross-sectional view of concrete floor structure, No. 7, 8, 9,
Figures 10 and 11 are plan views of the flooring material of the present invention. S...Concrete slab, M...Joining material, B
...Floor base material, b ₁ ... Foamed plastic lower layer with a static spring constant of 30 x 10 ⁶ N/m ³ or less measured in accordance with JIS A-6322, b ₂ ... Compliant with JIS A-9511 upper layer made of foamed plastic with a compressive strength of 0.8 to 3 Kg/cm ² as measured by F...Floor finishing material, 1... Sand wood.

【table】

【table】

Claims (1)

[Scope of Claims] 1. A concrete building with a structure in which a concrete slab, a foamed plastic flooring material is fixed to the slab using a bonding material, and a floor finishing material is stretched over the flooring material. In the floor structure of an object, the flooring material is provided with a foamed plastic lower layer having a static spring constant of 30 x 10 ⁶ N/m ³ or less as measured in accordance with JIS A-6322, and a timber. It is a laminated structure with a foamed plastic upper layer having a compressive strength of 0.8 to 3 Kg/cm ² as measured in accordance with JIS A-9511, and the laminate reaches from the surface of the upper layer to the surface of the lower layer. A floor structure of a concrete building characterized by 2. The flooring material consists of one upper layer and a lower layer divided into multiple parts, and a plurality of slats are provided in the upper layer, and each slat is in contact with one or more lower layers, and the adjacent slats are A floor structure according to claim 1, characterized in that the lower layers are spaced apart from each other. 3. The floor structure according to claim 1, wherein the area located on the surface of the upper layer of Japanese timber in the flooring material is smaller than the area in contact with the lower layer. 4 The foamed plastic in the upper layer of the flooring material is a foamed polystyrene molded product, and the foamed plastic in the lower layer recovers its shape to 1/2 to 4/5 of the compression rate after compressing the foamed polystyrene molded product. The floor structure according to claim 1, wherein the floor structure is obtained by slicing in a plane direction perpendicular to the post-compression direction. 5 The thickness of the lower layer of the flooring material is 20 to 20 times the thickness of the upper layer.
The floor structure according to claim 1, characterized in that it occupies 500%. 6. The floor structure according to claim 1, wherein the thickness of the lower layer of the flooring material is 10 to 100 mm. 7. The floor structure according to claim 1, wherein the floor finishing material is lauan plywood with a wall thickness of 20 mm or more.