JP7501829B2 - Floor impact sound reduction floors, floor impact sound reduction sheets, and floor impact sound reduction mats - Google Patents

Description

The present invention relates to a floor impact sound reduction floor, a floor impact sound reduction sheet, and a floor impact sound reduction mat that can reduce floor impact sound, particularly heavy floor impact sound.

In apartment buildings, it is necessary to suppress floor impact noise that is transmitted from upper floors to the floor below. There are two types of floor impact noise: light floor impact noise and heavy floor impact noise. Light floor impact noise can be reduced by laying a cushioning finish material such as carpet on the floor. On the other hand, it is difficult to reduce heavy floor impact noise even if a finish material is laid on the floor. This is because heavy floor impact noise is mainly determined by the thickness of the concrete floor. Therefore, in order to suppress heavy floor impact noise, it is important to plan the concrete floor to be thick when designing the building. Since it is impossible to change the concrete floor in an apartment building that has already been built, if it is necessary to improve the heavy floor impact noise after the concrete floor is constructed, there is a method of constructing a vibration-proof floating floor on top of the concrete floor, but vibration-proof floating floors are very expensive and may require reinforcement work due to their large mass. Furthermore, it is difficult to carry out work to change the floor finishing material in a residential environment where residents are already living.

As a simple floor impact noise countermeasure that can be implemented even after occupancy has begun, there is a method of laying a commercially available children's play mat on the finished floor (see Patent Document 1). However, while most commercially available play mats are effective at reducing light floor impact noise, they are unable to reduce heavy floor impact noise. Mats made of foam material that have the effect of reducing heavy floor impact noise are also commercially available, but because the surface of such mats made of foam material is soft, they will sag when subjected to a large impact load caused by a person jumping on them, resulting in a problem of reduced performance in reducing heavy floor impact noise.

Incidentally, some children with intellectual or developmental disabilities jump around on a daily basis, and as they grow, the vibration force during impact also increases. In households with such children, the solution is often to cover the entire room with foam mats, but when they wear out and their performance deteriorates, they need to be replaced, which is a big economic burden. Furthermore, the surfaces of many of these foam materials are red, blue, yellow, light blue, pink, etc., and are less attractive than finished floors such as flooring materials.

JP 2002-276135 A

The objective of the present invention is to provide a floor impact sound reduction floor, a floor impact sound reduction sheet, and a floor impact sound reduction mat that can reduce heavy floor impact sound.

The means for solving the problems of the present invention are as follows.
1. A floor impact sound reduction floor characterized by having a cushion layer made of multiple sheets of cushioning material laid on an existing floor, one or more sheet layers made of long sheets, and an adhesive layer that bonds the cushion layer and the sheet layer.
2. The floor impact sound reducing floor according to 1., wherein the cushion layer is a laminate of foam sheets.
3. The floor impact sound reduction floor according to 1. or 2., characterized in that the sheet layer has a smaller value of breaking elongation or yield elongation when the tensile strength is measured using a dumbbell-shaped No. 2 test piece specified in JIS K6251, of 2 mm or more, and the tensile strength at break or yield of the smaller elongation is 80 N or more.
4. A floor impact sound reducing sheet comprising a cushion, a sheet, and an adhesive layer for adhering the cushion and the sheet.
5. Two or more floor impact sound reducing sheets according to 4. and a cover sheet enclosing the floor impact sound reducing sheets,
The cover sheet has two or more bag-shaped portions each capable of containing one of the floor impact sound reduction sheets, and a connecting portion connecting the bag-shaped portions,
A floor impact sound reduction mat that can be folded around the connecting portion as an axis.

The floor impact sound reducing floor, floor impact sound reducing sheet, and floor impact sound reducing mat of the present invention (hereinafter also referred to simply as the reducing floor, reducing sheet, and reducing mat, respectively) are capable of reducing heavy floor impact noise.
The reduced floor of the present invention can be easily installed in an existing building. Since the reduced floor of the present invention can be installed in a short time, the burden on residents during installation is small.
The reduction floor of the present invention, in which the cushion layer is a laminate of foam sheets, can further reduce heavy floor impact noise. The reduction floor of the present invention is resistant to sagging, so that the frequency of replacement can be reduced. The reduction floor of the present invention, which uses a sheet layer in which the smaller of the breaking elongation or the yield elongation when the tensile strength is measured using a dumbbell-shaped No. 2 test piece specified in JIS K6251 is 2 mm or more, and the tensile strength at the time of breaking or yielding of the smaller elongation is 80 N or more, is very resistant to sagging because the sheet layer is resistant to deformation and has excellent repairability after deformation. The reduction floor of the present invention, in which the sheet layer has a printed layer, is excellent in design.
The reduction sheet and reduction mat of the present invention are easy to install and store, so they can be installed only when and where they are needed, and can be stored away when guests come over, etc.

FIG. 1 is a partial cross-sectional perspective view of a floor impact sound reduction floor according to a first embodiment of the present invention. FIG. 2 is a partial cross-sectional perspective view of a floor impact sound reduction floor according to a second embodiment of the present invention. 1 is a schematic diagram of a cover sheet according to one embodiment of the present invention for use in a floor impact sound reduction mat. FIG. 13 is a graph showing the relationship between tensile force and displacement in Experiment 2. FIG. 13 is a graph showing the relationship between the number of repeated loadings and the height reduction rate in Experiment 3.

"Floor impact sound reduction floor"
The floor impact sound reducing floor of the present invention will be described with reference to the embodiments.
FIG. 1 shows a partial cross-sectional perspective view of a floor impact sound reduction floor according to a first embodiment of the present invention.
The floor impact sound reduction floor 1 of the first embodiment has a cushion layer 2 consisting of nine cushion materials 21 laid on an existing floor, one sheet layer 3 consisting of two long sheets 31, and an adhesive layer (not shown) that bonds the cushion layer 2 and the sheet layer 3.

Cushion layer In the impact sound reduction floor of the present invention, the cushion layer is a plurality of cushion materials laid on the existing floor. Adjacent cushion materials can be fixed together with adhesive tape, glue, etc. In the impact sound reduction floor 1 of the first embodiment, the cushion material 21 is made of a laminate of foam sheets.
The material of the cushioning material used in the present invention is not particularly limited as long as it absorbs impact and reduces floor impact noise, but for example, foam is preferred. Foam has excellent impact noise reduction performance and excellent repairability against deformation. As the foam, polyethylene foam, polyurethane foam, polystyrene foam, etc. can be used, and among these, polyethylene foam is preferred because it has an excellent balance between impact noise reduction performance and strength and is low-cost.

In the floor impact sound reducing floor of the present invention, the cushioning material can be a single layer or a laminate, but it is preferable that the cushioning material is a laminate. A cushioning material made of a laminate has superior floor impact sound reduction performance compared to a single layer cushioning material with the same total thickness and material. Furthermore, the cushioning material made of a laminate can adjust the frequency band for reducing impact sound and the reduction performance by adjusting the elasticity, thickness, etc. of each layer.

The thicker the cushioning material, the better it is at reducing heavy floor impact noise (63 Hz), but as the thickness increases, problems such as the weight increases, the floor becomes more susceptible to sagging, and the difference in height between the area where the reduction flooring is not installed becomes large, making it difficult to live there, etc. become more serious, so the thickness is preferably 20 mm to 100 mm, and more preferably 40 mm to 80 mm. If the cushioning material is made of a laminate, the thickness of each layer is preferably 5 mm to 10 mm, and the thickness of each layer may be the same or different.

Sheet layer In the reduced floor of the present invention, one or more sheet layers are made of long sheets, and the bottom sheet layer is attached to multiple sheets of cushioning material. By attaching the long sheets to multiple sheets of cushioning material, it is possible to prevent the cushioning material from shifting. In the reduced floor 1 of the first embodiment, the long sheet 31 is one layer, has a width 1.5 times that of the cushioning material 21, a length 3 times that of the cushioning material 21, has an area equivalent to 4.5 sheets of the cushioning material 21, and is attached to six sheets of the cushioning material 21.
The sheet layer can be made of any material used for the surface material of a floor, without any particular limitations, and can be made of, for example, vinyl chloride, polypropylene, ethylene-polyvinyl alcohol copolymer, etc. Furthermore, these sheets can contain fibrous materials such as glass fiber, polymer fiber, etc. Furthermore, vinyl chloride is most commonly used as a surface material for a floor. Furthermore, when the sheet layer is the uppermost surface, it is preferable that the sheet layer is printed with a wood grain pattern or the like.

The sheet layer is less prone to deformation than the cushion layer, so by adhering the sheet layer to the surface of the cushion layer, the amount of deformation of the cushion layer can be reduced. In addition, the deformed sheet layer has the self-repairing ability to return to its original shape, and as the shape of the sheet layer is restored, the cushion layer adhered to the sheet layer can also return to its original shape, so the reduced floor of the present invention is less likely to sag.

Here, the long sheets used for construction purposes are generally about 1.8 m wide. Since the long sheets are narrow compared to the dimensions of the room, in order to install the reduced floor of the present invention over a wide area, it is necessary to join the widthwise ends of the long sheets with adhesives, welding, etc., as shown in Figure 1. The strength of the joints between the long sheets is inferior to that of seamless parts, so if a child jumps on the joints and a large force is applied, the joints may peel off or break.

FIG. 2 shows a partial cross-sectional perspective view of a floor impact sound reduction floor according to a second embodiment of the present invention.
The second embodiment of the floor impact sound reduction floor 10 has a sheet layer 3-2 on top of the sheet layer 3, and has the same configuration as the first embodiment of the reduction floor 1, except that the long sheet 31-2 that constitutes the sheet layer 3-2 is stacked so that its longitudinal direction is perpendicular to the long sheet 31.

As shown in the second embodiment, two or more sheet layers are laminated so that the longitudinal directions of the long sheets constituting each sheet layer are different, thereby preventing the breakage of the seams. Alternatively, even if the longitudinal directions are the same, the seams are laminated so that they do not overlap, thereby preventing the breakage of the seams. When laminating the sheets so that the longitudinal directions are the same and the seams do not overlap, the seams of the upper and lower sheet layers are preferably 5 cm or more apart in the horizontal direction, and more preferably 10 cm or more apart. When laminating two or more sheet layers, it is preferable to use a sheet containing a fiber material as at least one of the long sheets constituting the lower sheet layer in terms of preventing the breakage of the seam of the outermost sheet layer.
In the reduced floor of the present invention, the sheet layer may be one or more layers, but when a plurality of sheet layers are provided, it is preferable that the number of layers is two from the viewpoint of workability. In addition, when the width of the long sheet is sufficient to install the reduced floor of the present invention in a corridor or part of a room, one sheet layer is sufficient.

In the reduced floor of the present invention, it is preferable that at least one of the sheet layers has a smaller value of breaking elongation or yield elongation of 2 mm or more when the tensile strength is measured using a dumbbell-shaped No. 2 test piece specified in JIS K6251, and the tensile strength at the time of breaking or yielding of the smaller elongation is 80 N or more. If the smaller value of the breaking elongation or yield elongation is less than 2 mm, the sheet layer is likely to break during deformation or to remain stretched and wrinkle without returning to its original shape. Furthermore, if the tensile stress at this 2 mm extension is less than 80 N, the repair force is insufficient and the cushion layer is likely to collapse. The smaller value of the breaking elongation or yield elongation is more preferably 3 mm or more, and even more preferably 5 mm or more. Furthermore, the tensile stress at this 2 mm extension is more preferably 100 N or more, and even more preferably 120 N or more.

Adhesive layer The adhesive layer bonds the cushion layer and the sheet layer. In addition, when there are two or more sheet layers, the adhesive layer also bonds between the respective sheet layers. As the adhesive layer, any adhesive layer capable of firmly bonding the cushion layer and the sheet layer can be used without any particular limitation, and a pressure-sensitive adhesive, a heat-sensitive adhesive, a pressure-sensitive adhesive, a double-sided adhesive tape, etc. can be used. In this case, it is preferable that the adhesive surface of the sheet layer has fine unevenness such as embossing, since the adhesive strength is increased. In addition, the adhesive layer may be any layer capable of uniformly bonding the cushion layer and the sheet layer, and may be provided not only on the entire surface but also in a pattern formed by combining dots and lines. When provided in a pattern, the adhesive area is preferably 50% or more of the entire surface, and more preferably 60% or more.

The floor impact sound reducing floor of the present invention does not require reinforcement of the frame structure when it is laid, since both the cushioning material and the sheet layer are lightweight. The floor impact sound reducing floor of the present invention can be laid simply by laying multiple sheets of cushioning material on an existing floor to form a cushion layer, and then attaching a long sheet to this cushion layer to form a sheet layer. No special equipment is required for laying, and it can be laid in a short time by a small number of people. When laying the floor impact sound reducing floor of the present invention in a residence after it has been occupied, the occupants do not need to move for a short period of time. Both the cushioning material and the long sheet can be brought in by hand. The cushioning material and the long sheet are made of soft materials, and are unlikely to be damaged even if they collide with walls, furniture, etc. during delivery.

"Floor impact sound reduction sheet"
The floor impact sound reducing sheet of the present invention comprises a cushion, a sheet, and an adhesive layer that bonds the cushion and the sheet.
The floor impact sound reducing sheet of the present invention is equivalent in size to one piece of cushion material of the floor impact sound reducing floor of the present invention described above, and the cushion, sheet and adhesive layer can be made of materials equivalent to those of the floor impact sound reducing floor.

"Floor impact sound reduction mat"
A floor impact sound reduction mat can be made by enclosing two or more of the above-mentioned floor impact sound reduction sheets in a cover sheet that has a bag-shaped portion that can enclose each floor impact sound reduction sheet and a connecting portion that connects these bag-shaped portions.
A schematic diagram of a cover sheet according to one embodiment is shown in Fig. 3. The cover sheet 4 shown in Fig. 2 has three bag-shaped portions 41 and two connecting portions 42 connecting the bag-shaped portions 41, and can be folded around the connecting portions 42 as an axis. The cover sheet 4 shown in Fig. 2 can be folded like a folding screen because the connecting portions 42 are arranged so that they are alternately arranged up and down. In the present invention, the number of bag-shaped portions of the cover sheet is not particularly limited, but it is preferable that the number be 2 to 4 in terms of ease of handling.

Experiment 1: Heavy-duty floor impact sound reduction experiment "Example 1"
A commercially available sheet 1 (made of vinyl chloride: thickness 2 mm) was adhered with an acrylic adhesive to a laminated polyethylene mat (thickness 40 mm) consisting of a laminate of polyethylene foams having a thickness of 5 mm to obtain a test specimen.
"Example 2"
A test specimen was obtained in the same manner as in Example 1, except that the thickness of the laminated polyethylene mat was 50 mm.
"Example 3"
A test specimen was obtained in the same manner as in Example 1, except that the thickness of the laminated polyethylene mat was 80 mm.

"Comparative Example 1"
Only the laminated polyethylene mat of Example 1 was used as a test specimen.
"Comparative Example 2"
The specimen consisted of a single unlaminated polyethylene mat having a thickness of 40 mm.

"Comparative Example 3"
A test specimen was obtained in the same manner as in Example 1, except that the sheet 1 was replaced with a commercially available sheet 2 (made of vinyl chloride, thickness 0.8 mm).
"Comparative Example 4"
A test specimen was obtained in the same manner as in Example 1, except that the sheet 1 was replaced with a commercially available sheet 3 (made of vinyl chloride, thickness 2.3 mm).

The heavy-duty floor impact sound levels were measured using an impact source (tire) with impact force characteristics (1) according to JIS A1418-2:2000 under the conditions of laying each test specimen on the concrete floor and not laying it on the concrete floor, and the reduction in heavy-duty floor impact sound was calculated from the difference between the measured values. In addition, the change in shape of the test specimen before and after the test was visually confirmed. The results for the 1/3 octave bands from 50 Hz to 80 Hz, which are important for heavy-duty floor impact sound, are shown in Table 1.

Results It was confirmed from Examples 1 to 3 that thickening the cushion layer improves the performance of reducing heavy floor impact noise. In addition, in Examples 1 to 3, no change was observed in the shape of the test specimen before and after the test.
It was confirmed from Comparative Examples 1 and 2 that the cushion layer of the laminated body was superior in reducing the heavy floor impact noise. In Comparative Examples 1 and 2, dents were generated in the test specimens (only the cushion layer) after the test.
Example 1 and Comparative Example 3 had substantially the same heavy-duty floor impact sound reducing performance. However, the test specimen of Comparative Example 3 showed deformation in the sheet layer after the test.
In the test specimen of Comparative Example 4, the sheet layer broke after being struck once by the impact source, and it was not possible to measure the heavy floor impact sound.

Experiment 2: Tensile test The tensile strength was measured for sheets 1 to 3 used in experiment 1 and another commercially available sheet 4 (made of polyvinyl chloride: thickness 2 mm). For the measurement, a sheet cut into a dumbbell shape No. 2 as specified in JIS K6251 was pulled at a pulling speed of 100 mm/min using a tabletop precision universal testing machine (manufactured by Shimadzu Corporation, device name Autograph AGS-X 5kN) to measure the tensile strength against elongation. The measurement results are shown in Table 2 and Figure 4.

・Results Sheet 2 has a large displacement in response to tensile force. This is thought to be why deformation occurred in Experiment 1.
Sheet 3 had a yield elongation of 1.2 mm and a tensile strength at yield of 68.1 N. It is believed that Sheet 3 broke in Experiment 1 because of its small yield elongation.
Sheet 4 is stronger than Sheet 1 and is expected to be just as resistant to deformation as Sheet 1.

Experiment 3: Settling test "Comparative Example 5"
Only the laminated polyethylene mat of Example 2 was used as the test specimen.
"Comparative Example 6"
A test specimen was obtained in the same manner as in Example 2, except that the laminated polyethylene mat and the sheet 1 were not bonded to each other.

Repeated compression residual strain was determined in accordance with JIS K6400-4. Specifically, a force of 500 N was repeatedly applied 60 times per minute to a test specimen with planar dimensions of 500 mm x 500 mm using a pressure tool with a diameter of 100 mm, and the extent to which the height (thickness) at the loaded point decreased compared to before loading was measured. Similar measurements were also performed on the test specimens obtained in Example 2 and Comparative Example 3. The results are shown in Figure 5.

Results It was confirmed that Example 2 of the present invention is less likely to lose height and become sagging even when a load is repeatedly applied, compared to Comparative Examples 3, 5, and 6. In particular, it was confirmed from Example 2 and Comparative Example 6 that the height is less likely to decrease, i.e., the sagging becomes more difficult, by bonding the sheet layer and the cushion layer.

1, 10 Floor impact sound reduction floor 2 Cushion layer 21 Cushion material 3, 3-2 Sheet layer 31, 31-2 Long sheet

4 Cover sheet 41 Bag-shaped portion 42 Connection portion

Claims (2)

A cushion layer is formed by laying a plurality of cushioning materials adjacent to each other on an existing floor ;
One or more sheet layers made of long sheets ;
an adhesive layer that bonds the cushion layer and the sheet layer ;
having
The cushioning material is a laminate of foam sheets,
A floor impact sound reducing floor, characterized in that the thickness of the cushion material is 40 mm or more and 80 mm or less. The floor impact sound reduction floor according to claim 1, characterized in that the sheet layer has a smaller value of breaking elongation or yield elongation of 2 mm or more when the tensile strength is measured using a dumbbell-shaped No. 2 test piece specified in JIS K6251, and the tensile strength at break or yield of the smaller elongation is 80 N or more.