JPH0425481Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a floor structure for concrete buildings that is excellent in blocking impact noise and air-borne noise. [Conventional technology] The floor structure of conventional concrete buildings is as follows:
For example, there are those shown in FIGS. 3 to 5. Figure 3 shows the floor structure of a Western-style room, Figure 4 shows the shape of the subfloor material in Figure 3, and Figure 5 shows the adhesion of the bonding material applied to the concrete slab with the subfloor material in Figure 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 bonding material M usually consists of mortar balls m and an adhesive, and is applied by first applying the adhesive to a concrete slab, placing the mortar balls m on top of it, and then applying the adhesive to the top. The floor base material B is made by laying unit base materials B as shown in FIG. 4 in a jointed manner. For example, this unit base material b has a thickness of 50 mm, a width of 600 mm, and a length of 900 mm.
It is a unit plate of mm, and on the front side, crosspieces 1 for installing floor finishing materials are embedded at 450 mm intervals, and on the back side, piping grooves 2 for piping are provided vertically and horizontally. Floor finishing material F
Generally, the floorboards are made of wood and are 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 bare concrete slab 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 A1417-1974 (sound source room: height 2800mm x width
Table 1 shows the sound insulation performance measured in accordance with JIS A-1418-1974. As can be understood from the measurement results in Table 1, the floor structure [] using conventional foamed plastic flooring material lowers the sound pressure level difference between rooms at a center frequency of 500Hz compared to the bare floor []. Sound insulation class D
It is deteriorating the 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 [] listed 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 to solve the problem] In the present invention, a large number of diagonal slits are provided in the foam material that is the flooring material to change the spring constant characteristics of the flooring material, thereby reducing impact noise and air propagation in the floor structure. This improves the sound insulation effect. That is, the present invention is a concrete slab S
In the floor structure of a concrete building, a foamed plastic flooring material B is fixed on the slab using a bonding material _M1 , and a floor finishing material F is stretched over the flooring material B. The bulk density of the flooring material is 15
It is a foamed plastic body with a wall thickness of 25 to 150 mm and a thickness of 25 to 150 mm, with a large number of slits 4 on both the top and bottom sides, each with a groove width l of 1 to 5 mm and a depth d of 1/3 to 4/5 of the wall thickness. They are installed in parallel with each other at intervals of 50 to 200% of the wall thickness.
Moreover, this slit 4 is provided at an angle α of 30 to 75 degrees with respect to the main plane of the floor structure of a concrete building. The present invention will be explained below with reference to the drawings. In Figure 1, S is a concrete slab, M ₁ is a bonding material such as mortar or liquid resin adhesive, B is a foam flooring material, 1 is a crosspiece, and F is two 12 mm thick veneer plywood stacked together. The floor finishing material F is nailed to the crosspiece with nails 3. The bonding material _M1 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 Use an adhesive mixed with an ethylene/vinyl acetate copolymer dispersion. The size of the flooring material B is 400 to 1000 mm in length and 400 mm in width.
It is a block-shaped piece of 1000 mm and a height of 25 to 150 mm, or a piece that can be adjusted. For Western-style rooms, a crosspiece 1 is embedded in the top surface. The size can be determined as appropriate within the above range, but considering the height of the floor in practical use, a wall thickness of over 150 mm cannot be put to practical use, and on the other hand, a wall thickness of less than 25 mm may not provide sufficient sound insulation performance. No significant improvement can be obtained. Foamed plastics for flooring materials include high-density polyethylene, linear low-density polyethylene, polypropylene, propylene-ethylene copolymer, polystyrene, styrene-polyethylene copolymer, etc. with a bulk density of 15 to 40 g/mold. used. If the bulk density is less than 15g/, the molded product becomes too soft and is likely to be distorted, while if it exceeds 40g//, the molded product will become heavier. This foamed plastic flooring material B has slits on both the top and bottom sides that are diagonal [angle (α) 30 to 75 degrees] with respect to the main plane, and due to the presence of these slits (air layers), air-borne sound insulation is achieved. Improves effectiveness. This means that the natural frequency of a flooring material that does not have slits is the frequency that the sound of people or other harsh noises has.
It is about the same as 250 to 1000 Hz, causing a resonance phenomenon and the sound from the upper floor propagating to the lower floor.However, by providing the slits, the spring constant of the subfloor material changes, and its natural frequency becomes lower in the low frequency band. It is thought that this will eliminate resonance with human voices and harsh noises, thereby improving the sound insulation effect. Furthermore, the small deformation of the slit portion at the time of impact acts as a buffer against not only airborne sound but also floor impact noise, improving the sound insulation effect. If the angle at which the slit is provided is less than 30 degrees with respect to the main plane, the strength of the subfloor material will be weakened, and if it exceeds 75 degrees, deformation in the weight direction will occur when a load is applied. As it becomes smaller, the sound insulation effect becomes smaller. In particular, 45 degrees is optimal in terms of workability and noise prevention effect. The greater the volume occupied by the air layer in the subflooring material, the better the sound insulation effect against airborne sound, but the strength of the subflooring material decreases, so the depth, width of the slits,
You need to balance the spacing. If the depth of the slit is less than 1/3 of the wall thickness, the sound insulation effect will be small, and if it exceeds 4/5, the subfloor material will become too weak and cracks will occur, making it impossible to walk on. If the width of the slit is less than 1 mm, the sound insulation effect will be small, and if it exceeds 5 mm, the floor will be distorted when furniture or the like is installed on the floor structure, making it impractical. If the spacing between the slits is less than 50% of the wall thickness, there will be many slits in the flooring material.
If the strength is too weak, it will crack and become impossible to walk on, and if it exceeds 20% of the wall thickness, the number of slits will decrease, making it impossible to obtain a sufficient sound insulation effect. As the floor finishing material F, two sheets of plywood with a thickness of 12 mm were used for Western-style rooms, and these were nailed to the crosspiece 1. For the Japanese room, a piece of plywood is secured and then tatami mats are placed on top of it. The floor finishing material F preferably has a wall thickness of 20 mm or more, and in addition to the above-mentioned plywood, lauan plywood particle board, wood-based flooring material, or a combination of these can be used. [Example] Sound source room of a concrete building (floor area X x Y =
2800mm x 3670mm) concrete slab S (thickness
150mm), the floor structure shown in Figure 1 was installed. That is, first, a cement mortar adhesive is used on a cast-in-place concrete slab to achieve a bulk density of 25.
A foamed polystyrene molded body having a length of 900 mm, a width of 595 mm, and a thickness of 50 mm was fixed. Slits were provided in parallel at an angle of 45 degrees on both the upper and lower surfaces of this foam molded product, with a depth of 30 mm, a groove width of 2 mm, and an interval of 40 mm. Thereafter, two sheets of plywood with a thickness of 12 mm were nailed to the crosspieces 1 as floor finishing material F to form the floor structure shown in FIG. 1 above. Regarding the obtained floor structure, JIS A-1417 and JIS
The sound insulation effect of A-1418 was measured. The results are shown in Table 1. From Table 1, the floor structure of the present invention satisfies the lack of sound insulation performance against lightweight impact noise in the conventional floor structure [], and also eliminates the deterioration in sound insulation performance from bare floors against heavy impact noise. Not only center frequency 250Hz and 500Hz
This eliminates the drop in the sound pressure level difference between rooms and makes the sound insulation class D value comparable to that of bare floors. It is understood that it is excellent. 【table】

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the floor structure of the present invention, Fig. 2 is a partial perspective view of the subfloor material, Fig. 3 is a sectional view showing the floor structure of a conventional Western-style room in a concrete building, and Fig. 4 is a sectional view of the floor structure of a Western-style room in a conventional concrete building. Figure 3 shows the flooring material that makes up the floor structure, where A is a plan view from the front side, B is a plan view from the back side, and C is a side view from the direction of arrow E in A. , D is a side view seen from the direction of arrow F in A of the same figure, and FIG. 5 is a plan view showing a state in which the floor finishing material of FIG. 3 has been removed. S...Concrete slab, _M1 ...Joining material,
B...Floor base material, F...Floor finishing material, 1...Slab,
4...Slit.

Claims (1)

[Scope of claim for utility model registration] (1) Concrete consisting of a concrete slab, a foamed plastic flooring material fixed to the slab using a bonding material, and a floor finishing material stretched over the flooring material. In the floor structure of a building, the flooring material has a bulk density of 15 to 40 g/, and a wall thickness of 25 to 150 g/m.
It is a foamed plastic body with a width of 1 to 5 mm on both the top and bottom sides, and a large number of slits with a depth of 1/3 to 4/5 of the wall thickness at intervals of 50 to 200% of the wall thickness. A floor structure for a concrete building, characterized in that the slits are provided parallel to each other, and the slits are provided at an angle of 30 to 75 degrees with respect to the main plane. (2) Claim 1 for utility model registration, characterized in that the floor finishing material is lauan plywood with a wall thickness of 20 mm or more
Floor structure as described in section.