JP2007332668A - Cushioning material and floor structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cushioning material capable of effectively absorbing impact and being manufactured at low cost by extrusion molding, and a floor structure using the cushioning material. <P>SOLUTION: The cushioning material comprises a sheet of elastic material having a plurality of hollow parts 10 formed parallel to one another along a plane direction. A protrusion 12 serving as a rib-like member protruding in the thickness direction of the sheet of elastic material by a height smaller than the size of the hollow part 10 in the thickness direction and extending in a direction parallel to the hollow part is provided inside the hollow part 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cushioning material and a floor structure, and more particularly to a cushioning material that is directly bonded to a base of a structure, and a floor structure in which a flooring material is bonded to the upper surface of the cushioning material.

  As a floor structure in a building such as a school building, an apartment house, or a detached house, for example, a directly attached floor in which a floor finishing material such as a wooden floor finishing material is bonded to a concrete floor foundation is used. Since it is usually unavoidable that the floor base is uneven, a cushioning material made of foam or the like is bonded to the bottom surface of the directly attached floor so as to follow the unevenness of the floor base.

  However, if the cushioning material is too thin, not only the followability with respect to unevenness will be deteriorated, but also problems such as noise such as footsteps will be easily transmitted downstairs and the feeling of walking will be deteriorated. There is also a problem that the shock cannot be sufficiently absorbed when the child falls.

  On the other hand, when the cushioning material is too thick, there is a problem that the floor finishing material is warped due to the influence of moisture when the floor finishing material is woody. In addition, there are problems such as generation of cracks in floor finishing materials other than wood.

Therefore, as a cushioning material disposed between the floor finish material and the floor base material, it comprises a hard surface member and a foam layer positioned between the surface member and the floor base material, and the foam layer inside, the foam layer and the hard surface A composite flooring (Patent Document 1) characterized by having a gap between members or between a foam layer and a floor base,
A floor structure (Patent Document 2) using a plurality of convex portions and a plurality of concave portions, and a projection formed inside the concave portion in the previous period, and a finishing material, and a cushioning material arranged in a stock of the finishing material, A floor finishing material comprising at least two types of cushioning materials, A cushioning material and B cushioning material arranged in parallel, two or more buffering taigas, and floor finishing materials having different characteristics (Patent Document 3)
A floor structure such as was proposed.

These floor structures are excellent in that they have excellent shock absorption and relaxation performance, high safety, and no warping or cracking of the floor finish.
JP 63-40057 A JP 2004-68380 A JP 2003-288960 A

  However, foams and cushioning materials used in these floor structures are usually press-molded products obtained by press-molding rubber, so there is a limit to shortening the rubber vulcanization time, set time, and take-out time. . Therefore, until now, the only way to increase the production amount was to increase the number of molds or increase the number of products to be taken per mold.

  Therefore, if the production volume is increased, the capital investment increases, and this greatly rebounds to the unit price of the product. Therefore, there is a problem that it is difficult to reduce the cost of the product even if the production volume is each subject.

  The present invention has been made to solve the above problems, and does not lead to a significant increase in capital investment even if the production volume is increased, and a cushioning material capable of reducing the cost by the increased production volume, and An object is to provide a floor structure using the cushioning material.

  The invention according to claim 1 is a sheet-like elastic body in which a plurality of hollow portions are formed in parallel to each other along the surface direction, and the inside of the hollow portion in the thickness direction of the sheet-like elastic body, A cushioning material comprising a protrusion that is a rib-like member that protrudes at a height smaller than the dimension in the thickness direction of the hollow portion and extends in a direction parallel to the hollow portion. About.

  In the buffer material, when an impact is applied in the thickness direction, first, the partition wall that partitions the hollow portion is deformed. A relatively small impact is absorbed thereby. When a strong impact that cannot be completely absorbed by the partition wall is applied, the hollow portion is crushed and the protrusion is elastically deformed to absorb the impact. As described above, since the cushioning material can obtain a non-linear spring characteristic, it is possible to effectively absorb a weak impact and a strong impact as long as the impact is in the thickness direction, without increasing the thickness so much.

  The cushioning material has a pair of surface members that form one surface and the other surface, the hollow portion is formed by the pair of surface members and the partition wall, and the inside of the surface member is Cushioning material with protrusions formed on the surface, but these surface members, partition walls, and protrusions are integrally formed by extruding elastic materials such as rubber, thermoplastic elastomer, and soft plastic materials. Can be manufactured.

  Therefore, since the production amount of the buffer material can be increased only by increasing the extrusion speed of the elastic material, it is not always necessary to increase the number of extrusion molding devices in order to increase the production amount. Thus, in the said buffer material, since there is little problem that the capital investment for increasing a production amount increases, it is easy to reduce cost by increasing production.

  Further, when the cushioning material is manufactured by extrusion molding, the sectional shape is determined by the shape of the opening of the die, so that even a cushioning material having a complicated sectional shape can be easily manufactured.

  According to a second aspect of the present invention, the partition wall that partitions two adjacent hollow portions is a vertical wall-like body provided with a constant thickness along the thickness direction of the sheet-like elastic body. It relates to the cushioning material described in 1.

  Since the cushioning material has a simple cross-sectional shape, a die having a simple cross-sectional shape of the opening can be used when manufactured by extrusion. Therefore, further cost reduction is possible.

  The invention according to claim 3 relates to the cushioning material according to claim 1, wherein the partition is a wall body bent along the thickness direction of the sheet-like elastic body.

  In the cushioning material, since the partition wall is bent along the thickness direction, the hollow portion is buckled and deformed by a smaller impact in the thickness direction. Therefore, the cushioning material can absorb minute impacts particularly well.

  The invention according to claim 4 relates to the cushioning material according to claim 1, wherein the partition is an inclined wall provided obliquely with respect to the thickness direction of the sheet-like elastic body.

  In the cushioning material, since the partition wall is provided in an oblique direction with respect to the thickness direction, it is buckled and deformed even with a minute impact. Therefore, a small impact is absorbed well compared with the buffer material in which the partition wall is provided in parallel to the thickness direction. In addition, the shape of the opening of the die for extrusion molding may be simple as compared with the buffer material in which the partition wall is bent along the thickness direction, and can be manufactured at low cost.

  According to a fifth aspect of the present invention, the hollow portion includes a first hollow portion having a pipe-like cross section and a second hollow portion sandwiched between two adjacent first hollow portions, and the protrusion is The buffer material according to claim 1, wherein the cushioning material is provided in at least one of the first hollow portion and the second hollow portion.

  In the cushioning material, since the first hollow portion has a pipe-like cross section, when the impact in the thickness direction is applied, the first hollow portion is deformed so as to spread outward. Therefore, a small impact is absorbed well compared with the buffer material in which the partition wall is provided along the thickness direction.

The cushioning material can be manufactured by extrusion molding, but can also be manufactured by a method in which a tubular body of elastic material is disposed at a predetermined interval between a pair of elastic material sheets.
In addition, a projection part may be provided in a 1st hollow part and may be provided in a 2nd hollow part. Furthermore, you may provide in both a 1st hollow part and a 2nd hollow part.

  The invention according to claim 6 relates to the cushioning material according to any one of claims 1 to 5, wherein two or more protrusions are provided in one hollow part.

  In the cushioning material, since two or more protrusions are provided in one hollow part, a larger shock can be absorbed compared to a cushioning material in which one protrusion is provided in one hollow part. .

  According to a seventh aspect of the present invention, the partition includes a vertical portion extending along a thickness direction of the sheet-like elastic body, and a vertical portion extending along a surface direction of the sheet-like elastic body. The cushioning material according to claim 1, wherein the vertical portion also functions as a protrusion.

  In the cushioning material, a weak impact among the impacts in the pressure direction is absorbed by the buckling deformation of the horizontal portion. When a strong impact is applied, the cushioning material is compressed in the thickness direction by the impact, so that the vertical portion comes into contact with the ceiling surface and the bottom surface of the hollow portion. In this state, the impact is absorbed by elastic deformation of the vertical portion.

  In the buffer material, since the partition wall and the protrusion are integrated, the cross-sectional shape can be simplified as compared with the case where the partition wall and the protrusion are not integrated. Therefore, since the die for extrusion molding can be produced at a low cost, further cost reduction is possible.

  The invention according to claim 8 is the shock absorbing material according to any one of claims 1 to 7, which is adhered to the floor base on one surface, and a rigid plate material, which is the other of the shock absorbing materials. The present invention relates to a floor structure provided with a finishing material adhered to a surface.

According to the floor structure, for the same reason as described in the first aspect, a strong and weak impact applied to the finishing material can be effectively absorbed, so that a comfortable living environment is provided.
Further, since the cushioning material may be relatively thin, there is no problem that the finishing material is warped due to a difference in expansion coefficient between the cushioning material and the finishing material.

  As described above, according to the present invention, even if the impact absorption characteristics are excellent, increasing the production amount does not lead to a significant increase in capital investment, and the cost can be reduced by the increased production amount. A cushioning material and a floor structure using the cushioning material are provided.

1. Embodiment 1
The shock-absorbing material 1 according to Embodiment 1 is a sheet-like elastic body, and as shown in FIG. 1 and FIG. 2 (B), two second adjacent to the first hollow portion 10 having an elliptical cross-sectional shape. It has the 2nd hollow part 11 formed between the 1 hollow parts 10, and the projection part 12 which protrudes in the thickness direction of the buffer material 1 from the bottom face of the 1st hollow part 10, in other words. The first hollow portion 10 and the second hollow portion 11 are both tubular structures formed in parallel to each other along the surface direction of the cushioning material 1, and the protrusion 12 is parallel to the first hollow portion 10. It is the rib-like structure formed in. However, since the protruding portion 12 is lower in height than the ceiling surface of the first hollow portion 10, there is a gap between the ceiling surface of the first hollow portion 10 and the tip of the protruding portion 12 when no pressure is applied. Is open. The cushioning material 1 also includes a surface member 13 that forms one surface, a surface member 14 that forms the other surface, and a partition wall 15 that connects the surface member 13 and the surface member 14 in the thickness direction. The first hollow portion 10 and the second hollow portion 11 are formed by the surface member 13, the surface member 14, and the partition wall 15.

  The protrusion 12 may be provided inside the second hollow portion 11 as shown in FIG. 1B, and the first hollow portion 10 and the protrusion 12 as shown in FIG. It may be provided in both of the second hollow portions 11. However, when the protruding portion 12 is provided inside the second hollow portion 11, the height of the protruding portion 12 must be smaller than the height of the second hollow portion 11.

  As shown in FIG. 2A, the cushioning material 1 is adhered to the finishing material 120 on the surface on the surface member 13 side to form the floor structure 100 of the present invention. And it adhere | attaches on the foundation | substrate 110 in the surface at the surface member 14 side. Examples of the finishing material 120 include a flooring material, a carpet, a CF sheet, and a cork board.

  The cushioning material 1 may be one in which the surface member 13, the surface member 14, the partition wall 15, and the protrusion 12 are integrally formed of an elastic material, and the surface member 13 formed of a sheet of elastic material The first hollow portion 10 and the second hollow portion 11 may be formed by bonding a tubular body of an elastic material between the surface member 14 and the surface member 14.

  The former form of the cushioning material 1 can be formed by extruding an elastic material from a die having an opening of a predetermined shape and vulcanizing as necessary. On the other hand, in the latter form of the cushioning material 1, the protrusion 12 may be formed on one surface of the surface member 14, and the tubular material may be bonded to the surface, and the protrusion 12 is provided inside the tubular body. May be formed.

  Elastic materials include natural rubber, butadiene rubber, styrene butadiene rubber, isoprene rubber, chloroprene rubber, butyl rubber, diene rubber such as tolyl rubber, ethylene propylene rubber, ethylene / propylene / diene terpolymer, urethane rubber, polyamide Examples thereof include thermoplastic elastomers such as thermoplastic elastomers, polyethylene elastomers, epoxy resin elastomers, and polyester elastomers, and soft resins such as soft vinyl chloride resins.

  Hereinafter, the operation of the buffer material 1 will be described. In the floor structure 100, when a small impact is applied to the cushioning material 1 through the finishing material 120, the partition 15 is deformed by the impact, and the first hollow portion 10 is deformed in a direction of spreading outward. Thereby, a small impact is absorbed. On the other hand, when a large impact is applied, the first hollow portion 10 and the second hollow portion 11 are greatly deformed, and the top portions of the projecting portions 12 abut against the ceiling surfaces of the first hollow portion 10 and the second hollow portion 11, 12 is elastically deformed. Thereby, a big impact is also absorbed.

  The cushioning material 1 can impart desired vibration characteristics by changing the thickness of the partition wall 15 and the protruding portion 12, the height of the protruding portion 12, and the arrangement of the protruding portion 12. For example, when it is desired to absorb a large impact, the thickness of the partition wall 15 and the thickness and height of the protruding portion 12 are increased, and the protruding portion 12 is, for example, all of the first hollow portion 10 and the second hollow portion 11. What is necessary is just to arrange | position. On the other hand, in the case of absorbing minute vibrations well, the thickness of the partition wall 15 and the thickness and height of the protrusion 12 are reduced, and the protrusion 12 is formed inside the first hollow part 10 or the second hollow part 11, for example. It is only necessary to reduce the arrangement density of the protrusions 12 such that the arrangement density is provided only in the area.

  Furthermore, since the buffer material 1 can be formed by extrusion as described above, it can be manufactured with high productivity.

2. Embodiment 2
The shock-absorbing material 2 according to the second embodiment includes the first hollow portion 10 and the second hollow portion 11 similarly to the shock-absorbing material 1 of the first embodiment, but as shown in FIGS. 3 (A) and (B). The partition wall 15 that divides the first hollow portion 10 and the second hollow portion 11 is bent in a “<” shape toward the second hollow portion 11, in other words, bent in the thickness direction. The protrusion 12 is a triangle whose cross-sectional shape protrudes upward. The protrusion 12 may be formed inside the first hollow portion 10 as shown in FIG. 3A, or may be formed inside the second hollow portion 11 as shown in FIG.
Other configurations and operations are the same as those of the cushioning material according to the first embodiment.

3. Embodiment 3
As shown in FIG. 4A, the cushioning material 3 according to the third embodiment includes partition walls 31 that are bent stepwise along the thickness direction between the surface member 13 and the surface member 14 at a predetermined interval. The hollow portion 30 is formed between the partition wall 31 and the partition wall 31. The surface member 13, the surface member 14, and the partition wall 31 are integrally formed of an elastic material.

  The partition wall 31 is erected on the ceiling surface and the bottom surface of the hollow portion 30, and is provided along two vertical portions 31A extending along the thickness direction of the cushioning material 3 and along the surface direction of the cushioning material 3, It is comprised from the horizontal part 31B which connects the two vertical parts 31A integrally. 4A shows an example of the cushioning material 3 in which the vertical portion 31A and the horizontal portion 31B have substantially the same thickness, but as shown in FIG. 4B, the thickness of the vertical portion 31A. May be 2 to 4 times or more thicker than the thickness of the horizontal portion 31B.

  In the cushioning material 3, instead of providing the step-shaped bent partition wall 31 between the surface member 13 and the surface member 14, as shown in FIG. You may provide the partition 32 which consists of the provided vertical part 32A and the diagonal rib 32B which connects the vertical part 32A and the surface member 14. FIG. In the partition wall 32, the vertical portion 32A and the oblique rib 32B are integrally formed, and the partition wall 32 itself is also formed integrally with the surface member 13 and the surface member 14. In the cushioning material 3 shown in (C), minute grooves for improving the adhesion between the base 110 and the finishing material 120 are provided on both sides.

  In the cushioning material 3, the spring characteristics can be controlled by adjusting the thickness of the vertical portion 31A or the vertical portion 32A, the thickness of the horizontal portion 31B or the oblique rib 32B, and the hardness of the elastic material.

  When a minute impact in the thickness direction is applied to the buffer material 3, the horizontal portion 31 </ b> B of the partition wall 31 or the oblique rib 32 </ b> B of the partition wall 32 is deformed by shearing force, and the entire thickness of the buffer material 3 is reduced. Thereby, the impact is absorbed. When the impact applied to the cushioning material 3 increases, the deformation of the horizontal portion 31B or the oblique rib 32B increases, and the tip of the vertical portion 31A or the vertical portion 32A comes into contact with the bottom surface and the ceiling surface of the hollow portion 30. Accordingly, the vertical portion 31A or the vertical portion 32A is elastically deformed in the compression direction, in other words, functions as a protrusion. Therefore, a large impact can be absorbed effectively. Further, it is not necessary to form a protrusion separately from the partition wall 31 or 32.

4). Embodiment 4
In the cushioning material 4 according to the fourth embodiment, as shown in FIG. 5A, the surface member 13 and the surface member 14 are connected by a partition wall 41 having a V-shaped cross section. A space between the surface member 13 and the surface member 14 is divided by a partition wall 41 to form a hollow portion 40. A rib-shaped protrusion 12 is formed on the bottom surface of the hollow portion 40. The surface member 13, the surface member 14, the partition wall 41, and the protruding portion 12 are integrally formed of an elastic material.

  In addition, in the buffer material 4, instead of providing the partition wall 41 having the Y-shaped cross section, as shown in FIG. 5B, the partition wall 42 that is an oblique rib provided obliquely with respect to the thickness direction is formed. May be. Rib-shaped protrusions 12A and 12B are provided at the boundary between the surface member 13 and the partition wall 42 and at the boundary between the surface member 14 and the partition wall 42, respectively. Each of the protrusions 12 is formed facing inward.

  When an impact in the thickness direction is applied to the buffer material 4, first, the partition wall 41 or the partition wall 42 is buckled and compressed. This absorbs small impacts. In the aspect shown in (A), when the partition wall 41 or the partition wall 42 is buckled and compressed, a large impact that cannot be absorbed is applied. In the embodiment shown in FIG. ), The protrusion 12A is in contact with the bottom surface of the hollow portion 40, and the protrusion 12B is in contact with the ceiling surface of the hollow portion 40. And the projection part 12 (12A, 12B) compressively deforms. Thereby, a big impact is also absorbed.

In the embodiment shown in FIG. 4 (B), since the two protrusions 12 are provided in one hollow portion 40, a larger impact than that shown in FIG. 4 (A) is applied. Can absorb.
In addition, the buffer material 4 can be shape | molded by extrusion molding of an elastic material in the aspect shown to (A), and the aspect shown to (B).

5). Embodiment 5
In the cushioning material 5 according to the fifth embodiment, as shown in FIGS. 6A to 6C, the surface member 13 and the surface member 14 are connected to each other by partition walls 51 arranged at a predetermined interval. The partition wall 51 is bent in a “<” shape along the thickness direction. A hollow portion 50 is formed by the surface member 13, the surface member 14, and the partition wall 51. On the ceiling surface of each hollow portion 50, two or three rib-like protrusions 12A are erected downward, and on the bottom surface, two rib-like protrusions 12B are erected upward. Has been. The surface member 13, the surface member 14, the partition wall 51, and the protruding portion 12 are integrally formed of an elastic material. In the embodiment shown in FIG. 6A, the protrusion 12A has a fang-shaped or acute-angled triangular cross section, and the protrusion 12B has an isosceles triangular cross section with rounded vertices. On the other hand, in the example shown in FIG. 6B, both the protrusion 12A and the protrusion 12B have an isosceles triangular cross section with rounded vertices. In the example shown in FIG. 6C, the protrusion Each of 12A and protrusion 12B has an isosceles triangular cross section with a sharp apex. Thus, the protrusion 12A and the protrusion 12B may have the same cross-sectional shape or different cross-sectional shapes.

  In the buffer material 5, a small impact is absorbed by the buckling of the partition wall 51. On the other hand, when a large impact is applied, the displacement in the thickness direction is restricted by the protrusion 12A and the protrusion 12B, and at the same time, the protrusions 12A and 12B are deformed in the compression direction to absorb the shock. Here, since the protrusion 12 is more easily compressed and deformed when the tip is sharper than when the front end is rounded, one hollow part 50 is provided with three protrusions 12A and two protrusions 12B. In the modes shown in (B) and (C), the mode of (C) in which the tips of the projections 12A and 12B are sharp is the mode of (B) in which the tips of the projections 12A and 12B are rounded. Compared to the compression direction, it is considered soft. On the other hand, in the embodiment shown in (A), since there are two protrusions 12A and 12B in one hollow portion 50, it is considered softer in the compression direction than in the embodiment (B).

  As described above, the cushioning material 5 can control the softness in the compression direction not only by the thickness of the partition wall 51 and the bending size but also by the number and the sectional shape of the protrusions 12A and 12B.

6). Embodiment 6
In the cushioning material 6 according to the sixth embodiment, as shown in FIG. 7, rib-like protrusions 12 </ b> A and 12 </ b> B are erected at predetermined intervals on opposite surfaces of the surface member 13 and the surface member 14. . The protrusions 12A and 12B are formed in parallel to each other. The protrusion 12A is formed integrally with the surface member 13, and the protrusion 12B is formed integrally with the surface member 14. The tip of the protrusion 12A is in contact with the surface member 14, but there is a gap between the protrusion 12B and the surface member 13 when the protrusion 12A is not compressed. The protruding portion 12A can also be referred to as a partition, and a hollow portion 60 is formed by the surface member 13, the surface member 14, and the protruding portion 12A.

  When an impact in the compression direction is applied to the cushioning material 6, first, the protrusion 12 </ b> A is elastically deformed. When the protrusion 12A is elastically deformed and the tip of the protrusion 12B and the surface member 13 come into contact with each other, the protrusion 12B is also elastically deformed together with the protrusion 12A.

  The cushioning material 6 may be extruded integrally as a whole, but the surface member 13 and the protruding portion 12A, and the surface member 14 and the protruding portion 12B are extruded, and then the protruding portion 12A and the protruding portion 12B. Are manufactured by adhering the tips of the projections 12A to the surface of the surface member 14 on the side where the projections 12B are formed.

FIG. 1 is a cross-sectional view illustrating a cross-section in the width direction of the cushioning material according to the first embodiment. FIG. 2 is a cross-sectional view showing an example of a floor structure using the cushioning material according to the first embodiment and a perspective view showing the cushioning material from obliquely above. FIG. 3 is a cross-sectional view illustrating a cross-section in the width direction of the cushioning material according to the second embodiment. FIG. 4 is a cross-sectional view illustrating a cross-section in the width direction of the cushioning material according to the third embodiment. FIG. 5 is a cross-sectional view illustrating a cross-section in the width direction of the cushioning material according to the fourth embodiment. FIG. 6 is a cross-sectional view illustrating a cross-section in the width direction of the cushioning material according to the fifth embodiment. FIG. 7 is a cross-sectional view illustrating a cross-section in the width direction of the cushioning material according to the sixth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Buffer material 2 Buffer material 3 Buffer material 4 Buffer material 5 Buffer material 6 Buffer material 10 Hollow part 11 Hollow part 12 Projection part 12A Projection part 12B Projection part 13 Surface member 14 Surface member 15 Partition 30 Hollow part 31 Partition 31A Vertical part 31B Horizontal part 32 Bulkhead 32A Vertical part 32B Diagonal rib 40 Hollow part 41 Bulkhead 42 Bulkhead 50 Hollow part 51 Bulkhead 60 Hollow part 100 Floor structure 110 Base 120 Finishing material

Claims (8)

A sheet-like elastic body in which a plurality of hollow portions are formed in parallel to each other along the surface direction,
The hollow portion projects in the thickness direction of the sheet-like elastic body at a height smaller than the dimension of the hollow portion in the thickness direction, and extends in a direction parallel to the hollow portion. A cushioning material comprising a protruding portion which is a rib-like member.   The cushioning material according to claim 1, wherein the partition wall that partitions two adjacent hollow portions is a vertical wall-like body provided along the thickness direction of the sheet-like elastic body.   The cushioning material according to claim 1, wherein the partition wall is a wall body bent along the thickness direction of the sheet-like elastic body.   The cushioning material according to claim 1, wherein the partition wall is an inclined wall provided obliquely with respect to the thickness direction of the sheet-like elastic body.   The hollow portion includes a first hollow portion having a pipe-like cross section and a second hollow portion sandwiched between two adjacent first hollow portions, and the protruding portion is formed with the first hollow portion and the second hollow portion. The cushioning material according to any one of claims 1 to 4, wherein the cushioning material is provided inside at least one of the hollow portions.   The cushioning material according to any one of claims 1 to 5, wherein two or more protrusions are provided in one hollow portion.   The partition wall includes a vertical portion extending along the thickness direction of the sheet-like elastic body, and a horizontal portion extending along the surface direction of the sheet-like elastic body and integrally formed with the vertical portion. The cushioning material according to claim 1, wherein the vertical portion also functions as a protrusion.   The cushioning material according to any one of claims 1 to 7, which is adhered to the floor base on one surface, and a finishing material which is a rigid plate and is adhered to the other surface of the cushioning material. With floor structure.

Images