Flooring materials with improved noise reduction performance for inter-floor noise

Abstract

The present invention relates to a flooring material for blocking inter-floor noise, comprising: a waterproof surface layer; a sound-absorbing layer provided below the waterproof surface layer; a cushioning layer provided below the sound-absorbing layer; a plurality of elastic springs inserted into a plurality of holes formed in the cushioning layer; and a plurality of caps disposed between the sound-absorbing layer and the cushioning layer to cover each of the holes; wherein the flooring material is implemented as a polygonal-shaped board or tile, and a plurality of flooring materials are joined together to form a flooring material for blocking inter-floor noise that can be installed on the floor surface of a structure.

Description

Technology Field

[0001] The present invention relates to a flooring material for blocking inter-floor noise, which is implemented in the form of a polygonal board or tile so as to be installed on the floor surface of a building, and includes a plurality of elastic springs and caps inside to absorb vibrations and effectively block inter-floor noise. Background Technology

[0002] Inter-floor noise has been cited as a major complaint in modern multi-unit housing. In particular, starting in 2025, the Ministry of Land, Infrastructure and Transport has further tightened regulatory standards for inter-floor noise. As regulatory standards are tightened, there is an increasing demand for construction companies to apply flooring materials with higher levels of soundproofing performance.

[0003] However, to achieve high sound insulation ratings, conventional technology has utilized methods such as increasing the thickness of concrete slabs, installing tile-type soundproofing materials or composite soundproofing panels on finished floors, and existing elastic layer technologies using cushioning materials made of simple rubber sheets or cork.

[0004] However, these conventional technologies had several fundamental problems. Conventional technologies have the problem that existing soundproofing systems require complex and advanced technology for construction, resulting in high construction costs that limit economic accessibility for ordinary residents, and require cumbersome construction processes such as removing existing flooring. Furthermore, simple cushioning materials have the problem that the repulsive force differs between areas where pressure is applied and areas where it is not, making it difficult to expect a uniform soundproofing effect across the entire floor, and performance degradation is particularly severe in areas with high vibration. In particular, cushioning materials made of rubber sheets or foam have the problem that their elasticity decreases over time and performance deteriorates due to compressive deformation. Additionally, in the case of styrofoam, conventional styrofoam has the problem that it adheres tightly to the layer above it over time, increasing conductivity and reducing the noise transmission effect.

[0005] Under these circumstances, there is also the problem that achieving a high sound insulation rating requires a large amount of auxiliary materials and thick concrete layers, which significantly increases construction costs and ultimately leads to an increased financial burden on homebuyers.

[0006] Therefore, in order to solve the problems of these conventional technologies, there is a growing need for flooring materials that can efficiently block inter-floor noise. The problem to be solved

[0007] The present invention aims to provide a flooring material that blocks inter-floor noise in order to solve the aforementioned problems.

[0008] Through this, the present invention aims to provide a flooring material that blocks inter-floor noise, is easy to install and cost-effective, effectively blocks inter-floor noise, and provides stable performance over a long period.

[0009] In addition, the purpose is to effectively block both high and low frequencies by forming an air layer composed of multiple elastic springs and caps, fundamentally solve the problem of increased conductivity caused by the adhesion of styrofoam and the upper layer over time, and enable the achievement of a high level of sound insulation grade without increasing additional costs for the construction company. means of solving the problem

[0010] According to one embodiment of the present invention for achieving the above technical objectives, a floor material for blocking interlayer noise comprises: a waterproof surface layer; a sound-absorbing layer provided below the waterproof surface layer; a cushioning layer provided below the sound-absorbing layer; a plurality of elastic springs inserted into a plurality of holes formed in the cushioning layer; and a plurality of caps disposed between the sound-absorbing layer and the cushioning layer to cover each of the holes. The floor material may be implemented as a polygonal-shaped board or tiles, and a plurality of floor materials may be joined together to be installed on the floor surface of a structure.

[0011] In addition, the plurality of holes may be spaced apart from each other at a certain interval, and the elastic spring may be formed to protrude outside each hole when inserted into the plurality of holes without any external force being applied.

[0012] In addition, when the plurality of holes form a group and a group of holes is formed for each flooring material, the group is formed in the exact center of each flooring material, and the distance between the outermost hole in the group and the hole closest to the outermost hole in another flooring material adjacent to the flooring material may be no different from the distance between holes within the group, or may differ by 5 mm or less.

[0013] In addition, when the flooring material is configured in a rectangular shape, the shape formed by the group of holes is rectangular, and each hole may be spaced apart at equal intervals with the center hole at the center.

[0014] Additionally, the cap may be composed of a head portion and a peripheral portion extending from the edge of the head portion, wherein the head portion of the cap is inserted into the hole and fixed while pressing the elastic spring, and a sound-absorbing layer is disposed on the cap, so that the area between the sound-absorbing layer and the buffer layer where the cap is not disposed forms an air layer as an empty space.

[0015] Additionally, the cap may further include a body portion that extends downward from the bottom of the head portion and has a sealed bottom, and the cross-section at the point where the head portion and the body portion meet may be formed as a curved surface having a predetermined curvature.

[0016] In addition, the diameter of the head portion corresponds to the diameter of the hole, and the diameter of the periphery portion may be larger than the diameter of the hole. Effects of the invention

[0017] The present invention can effectively block vibrations that cause inter-floor noise by providing an inter-floor noise-blocking flooring material. Through this, residential disputes caused by inter-floor noise can be drastically reduced, and the quality of the residential environment can be significantly improved.

[0018] In addition, since the present invention is implemented as a polygonal board or tile and can be installed directly on an existing floor, the installation process is very simple and fast. Furthermore, since it does not require professional skills, installation costs can be drastically reduced, and even ordinary residents can easily install it.

[0019] In addition, by individually arranging multiple elastic springs, the overall sound insulation performance is maintained even in the event of partial damage, resulting in excellent durability. Furthermore, due to the elastic characteristics of the springs, stable sound insulation performance can be provided over a long period, and maintenance is easy through the replacement of individual parts when necessary.

[0020] In addition, by forming an air layer through a multi-layer structure, multiple elastic springs, and caps, high-frequency and low-frequency vibrations can be effectively blocked simultaneously, which can drastically reduce residential disputes caused by inter-floor noise and significantly improve the quality of the residential environment.

[0021] In addition, this invention can achieve high-grade sound insulation performance starting in 2025 without increasing costs, allowing construction companies to meet regulatory standards without additional burden.

[0022] In addition, the present invention forms an air layer that is permanently preserved due to the cap and spring, thereby completely solving the problem of conductivity increasing as the styrofoam and the upper layer adhere over time as in conventional technology, and thus can continuously maintain a stable soundproofing effect for a long period. Brief explanation of the drawing

[0023] FIG. 1 is an exploded perspective view of an inter-floor noise-blocking flooring material according to one embodiment of the present invention. FIG. 2 is a cross-sectional view of a floor material for blocking inter-floor noise according to one embodiment of the present invention. FIG. 3 is a perspective view of a cap according to one embodiment of the present invention. FIG. 4 is a cross-sectional view of a cap according to one embodiment of the present invention. FIG. 5 is a drawing showing a plurality of holes formed in a buffer layer of a floor material for inter-floor noise insulation according to one embodiment of the present invention. Specific details for implementing the invention

[0024] Embodiments of the present invention are described in detail below with reference to the attached drawings so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification are denoted by similar reference numerals.

[0025] Throughout the specification, when a part is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components, and it should be understood that this does not preclude in advance the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0026] The following embodiments are detailed descriptions to aid in understanding the present invention and are not intended to limit the scope of the rights of the present invention. Accordingly, inventions within the same scope that perform the same function as the present invention will also fall within the scope of the rights of the present invention.

[0027] The present invention relates to a flooring material for blocking inter-floor noise, which is implemented in the form of a polygonal board or tile so as to be installed on the floor surface of a building, and includes a plurality of elastic springs and caps inside to absorb vibrations and effectively block inter-floor noise.

[0028] Referring to FIG. 1, an interlayer noise-blocking floor material (100) according to one embodiment of the present invention may include a waterproof surface layer (110), a sound-absorbing layer (120) provided below the waterproof surface layer (110), a buffer layer (150) provided below the sound-absorbing layer (120), a plurality of elastic springs (140) inserted into a plurality of holes formed in the buffer layer (150), and a plurality of caps (130) disposed between the sound-absorbing layer (120) and the buffer layer (150) to cover each hole.

[0029] In addition, the inter-floor noise-blocking floor material (100) of the present invention may be implemented as a polygonal-shaped board or tile, and multiple floor materials may be joined together to be installed on the floor surface of a structure. Although the inter-floor noise-blocking floor material (100) may be implemented in different forms according to various embodiments, the following description will be made by referring to an example implemented in a square shape, which is a representative embodiment.

[0030] According to an additional embodiment of the present invention, when a plurality of flooring materials are joined together and installed on the floor surface of a structure, the inter-floor noise-blocking flooring material (100) may further include a position fixing means to improve stability during installation. Specifically, in the embodiment, a plurality of anti-slip protrusions that contact the floor surface are formed on the bottom edge of the waterproof surface layer (110), and these are formed of rubber or silicone material to prevent movement of the flooring material during installation.

[0031] Meanwhile, an elastic sealant is additionally added between the contact surfaces of the upper and lower connecting parts to form a complete seal when joining adjacent flooring materials. In this case, the elastic sealant is formed in the shape of an O-ring made of silicone or EPT material and is inserted into a sealing groove formed on the contact surface of the connecting part to completely block leakage of foamed cement mortar, thereby fundamentally resolving the problems of connection separation and mortar leakage that frequently occur in conventional technology.

[0032] Meanwhile, according to another embodiment of the present invention, the inter-floor noise-blocking flooring material (100) may further include an improved connection structure to improve the bonding stability between adjacent flooring materials. In the embodiment, among the multiple layers constituting the inter-floor noise-blocking flooring material (100), a plurality of protrusions are formed on the upper surface of the lower connection part of one of the layers, and a recess corresponding to the protrusions is formed on the lower surface of the upper connection part, so that when adjacent flooring materials are bonded, the connection between the protrusions and the recess can prevent horizontal and vertical displacement. At this time, a fine uneven pattern is formed on the contact surface of the connection part to increase frictional force, and a sealing rib is formed protrudingly on the inner side of the connection part to double-block leakage of cement mortar.

[0033] Referring to FIG. 2, the layers constituting the interlayer noise-blocking flooring material (100) of the present invention are described as follows: the waterproof surface layer (110) is formed of polyethylene (PE) material and is the top layer that fundamentally blocks water penetration into the floor surface and protects the flooring material from external impact. The thickness of the waterproof surface layer (110) is generally formed in the range of 1 mm to 3 mm, and is treated to have an appropriate friction coefficient on the surface to prevent slipping when walking. In addition, the waterproof surface layer (110) has ultraviolet blocking properties, which prevents long-term color deterioration in an indoor environment and ensures durability.

[0034] Next, the sound-absorbing layer (120) is formed from a cashmere material and is placed below the waterproof surface layer (110) to absorb high-frequency noise transmitted through the air. The thickness of the sound-absorbing layer (120) is generally formed in the range of 10 mm to 20 mm, and it has an open cell structure to allow sound waves to penetrate inside, thereby converting noise energy into thermal energy. The cashmere material used here is lightweight, flexible, and has excellent sound-absorbing properties, so it can effectively absorb voice and noise of various frequency bands, and has the characteristic of providing a stable soundproofing effect over a long period of time with minimal degradation of sound absorption performance over time.

[0035] Meanwhile, according to an additional embodiment of the present invention, the sound-absorbing layer (120) may be implemented to have a double elastic spring structure to maximize shock absorption performance. Specifically, in the embodiment, a first elastic spring and a second elastic spring having different elastic moduli are arranged coaxially between the upper cap (130) and the lower cap (130). The first elastic spring is located on the outside and has a relatively higher elastic moduli than the existing elastic spring and the second elastic spring to absorb initial shock, and the second elastic spring is located on the inside and has a lower elastic moduli than the existing elastic spring and the first elastic spring to perform a secondary cushioning action.

[0036] Additionally, a plurality of spring seating grooves may be radially formed on the protrusions of the upper cap (130) and the mirror-like protrusions of the lower cap (130), so that the upper and lower ends of each elastic spring are inserted and fixed into the corresponding seating grooves, thereby preventing rotation or buckling of the springs when a load is applied. At this time, the seating grooves may have a diameter that is larger than the outer diameter of each elastic spring by a predetermined amount, so that the structure can be formed to facilitate the insertion of the elastic springs while preventing lateral displacement. Through this, the present invention implements a double spring and anti-rotation structure, thereby providing the effect of improving the shock absorption rate by 30-40% compared to a single spring structure and maintaining the flatness of the waterproof surface layer (110) for a long period of time.

[0037] Next, the cushioning layer (150) is formed from a styrofoam material and is placed below the sound-absorbing layer (120) to absorb and mitigate vibrations and shocks transmitted from the upper layer. The thickness of the cushioning layer (150) is generally formed in the range of 15 mm to 30 mm and is manufactured to have a constant compressive strength to maintain elasticity even under repeated vibrations. The styrofoam material used at this time is lightweight and has excellent cushioning properties, so it can effectively disperse the impact force caused by footsteps.

[0038] According to an additional embodiment of the present invention, the cushioning layer (150) may be formed as a composite structure in which a plurality of elastic layers having different elastic moduli are stacked. In the embodiment, the elastic moduli of each layer may be selected according to the frequency band to be blocked. For example, it may be implemented by arranging a first elastic layer with a first elastic modulus (e.g., 0.5-1.0 MPa) to block footstep noise, and a second elastic layer with a second elastic modulus (e.g., 0.2-0.4 MPa) to block heavy impact sound. At this time, a damping member to suppress resonance may be additionally filled inside the cap (130), and this fills the gap between the cushioning layer (150) and the waterproof surface layer (110) to prevent unnecessary resonance, thereby providing additional sound insulation performance in a specific frequency band compared to the prior art of a simple spring structure.

[0039] Additionally, multiple holes, which are the core of the present invention, are formed inside the cushioning layer (150), into which an elastic spring (140) and a cap (130) are inserted. In the present invention, by utilizing an elastic spring (140), higher performance in physical property testing can be expected compared to when rubber is inserted into the holes. Here, physical property testing may refer to a series of tests (examinations) performed by placing a heavy material on a base plate and observing for a long time whether subsidence occurs. The method of inserting such an elastic spring (140) into the cushioning layer (150) can be performed as follows. First, a polygonal or circular hole larger than the diameter of the spring is formed in each area of ​​the cushioning layer (150), and the hole is formed with a size large enough to allow the spring to be inserted comfortably. Afterward, the elastic spring (140) is placed in the formed hole, and the area around the spring inside the hole is filled with a material other than the material constituting the cushioning layer (150) (e.g., Styrofoam) (e.g., Cashmere). Afterward, various processes such as bonding or curing are performed so that the filled material becomes integrated with the cushioning layer (150), and the elastic spring (140) is inserted into the cushioning layer (150). This is an insertion method to increase the vibration and noise reduction effect. In the prior art, styrofoam, which has been frequently used as the cushioning layer (150), acts as a cushioning material and an insulating material, but cannot perform the role of soundproofing or vibration damping, so there is a problem that it transmits noise and vibration as is. To solve this problem, it is important to ensure that the elastic spring (140) and the cushioning layer (150) (styrofoam) do not come into direct contact. When the elastic spring (140) is attached to the cushioning layer (150) in the manner described above, the noise transmitted to the elastic spring (140) can be prevented from propagating to the cushioning layer (150), thereby increasing the vibration and noise reduction effect. That is, through this structure, the cushioning layer (150) can absorb vibration energy while also providing additional soundproofing performance through the elastic spring (140).

[0040] Meanwhile, a cap (130) according to one embodiment of the present invention may be composed of a head portion, a peripheral portion extending from the edge of the head portion, and a body portion (152) extending downward from the bottom of the head portion and having a sealed bottom.

[0041] Referring to FIG. 2, the diameter of the body portion (152) of the cap (130) can be designed to correspond to the inner diameter of the elastic spring (140). Through this structure, the body portion (152) of the cap (130) is implemented to fit snugly into the spring. When designed in this way, the elastic spring (140) and the cap are integrated with each other, and the cap (130) tends to be strongly constrained inside the elastic spring (140). Therefore, issues such as the cap coming out of the spring due to an impact event on the floor plate can be prevented in advance, and as the elastic spring (140) and the cap (130) are more closely attached, sound insulation performance can also be further improved.

[0042] Additionally, the diameter of the head portion is designed to be smaller than the diameter of the hole, and the diameter of the periphery portion can be formed to be larger than the hole. This structure is intended to prevent the cap (130) from coming out of the hole of the cushioning layer (150) and to ensure stable fixation. According to the present invention, since the head portion of the cap (130) is formed to be smaller than the diameter of the hole, the head portion of the cap (130) is inserted into the hole with the elastic spring (140) fully inserted, allowing the elastic spring (140) to be accurately compressed by the periphery portion, which has a diameter larger than the hole. Furthermore, since the diameter of the periphery portion is formed to be larger than the diameter of the hole, the periphery portion catches on the upper surface of the cushioning layer (150), thereby preventing the entire cap (130) from sinking downward. Through this structure, the present invention can provide consistent sound insulation performance over a long period of time because the cap (130) is stably maintained in a set position and the height of the air layer is preserved at a constant level. Additionally, since the cap (130) is not scattered or lost, there is an advantage of significantly improving the durability and maintenance efficiency of the product.

[0043] As illustrated in FIG. 2, the cap (130) of the present invention is inserted into a hole and fixed in place while pressing the elastic spring (140) as previously described. At this time, a sound-absorbing layer (120) is placed on top of the cap (130), so that the area where the cap (130) is not placed between the sound-absorbing layer (120) and the buffer layer (150) can form an air layer as an empty space.

[0044] This structure is intended to effectively block vibrations in the low-frequency band. It may utilize the principle of a resonance chamber, where the air within the air layer acts as an elastic body to reflect vibrations when low-frequency vibrations are transmitted, by forming an air layer between the cap (130) and the sound-absorbing layer (120). Through this structure, the present invention realizes a double-blocking structure in which high-frequency noise transmitted from the upper layer is absorbed by the sound-absorbing layer (120) and low-frequency vibrations are reflected by the air layer. This enables the provision of comprehensive soundproofing performance across the entire frequency band, which could not be achieved by conventional simple sound absorption or cushioning methods. In particular, since the main culprit of inter-floor noise, such as footsteps or running, corresponds to low-frequency impact sound, the present invention can block this very effectively, thereby offering the advantage of fundamentally solving the problem of inter-floor noise in residential environments.

[0045] Meanwhile, referring to FIG. 3, a small drain hole (131) may be provided in the center of the protrusion of the cap (130). If water is generated due to rain or condensation, and the generated water flows into the protrusion of the cap (130), it may cause corrosion or wear of the protrusion. To prevent this problem, the cap (130) according to one embodiment of the present invention may be implemented with a drain hole (131) to allow water to drain out.

[0046] Additionally, as shown in FIG. 4, the cross-section at the point where the head portion of the cap (130) meets the body portion (152) can be formed as a curved surface (151) having a preset curvature.

[0047] This may be intended to prevent the repulsive force of the elastic spring (140) from concentrating on the cap (130) and to disperse the stress. Since the connecting part formed with this curved surface (151) has no sharp edges, the repulsive energy of the elastic spring (140) is evenly distributed over a wide area, thereby preventing stress from concentrating in a specific part. Through this, the cap (130) of the present invention is not easily damaged even with repeated compression and restoration of the elastic spring (140), so the durability of the product can be greatly improved. In addition, due to the curved surface (151) design, energy is transferred more efficiently when absorbing shock, so the soundproofing performance can also be further improved.

[0048] Meanwhile, according to one embodiment of the present invention, a plurality of holes formed in the cushioning layer may be spaced apart from each other by a certain distance. At this time, the elastic spring (140) is formed to protrude outside each hole when inserted into the plurality of holes without any external force being applied, and may be pressed and fastened as the above-described cap (130) is combined with it.

[0049] Additionally, a plurality of holes formed in the buffer layer form a group arranged in a shape identical to the shape of the inter-floor noise-blocking floor material (100), and one group can be formed in the center of each floor material. Additionally, when the floor material is composed of a square, the shape formed by a group of holes is a square, and each hole can be spaced apart at equal intervals with the hole placed in the center as the center.

[0050] Referring to FIG. 5, in the case of a square-shaped inter-floor noise-blocking flooring material, a group of identical square-shaped holes is arranged as previously described. Assuming that 16 holes are arranged in a 4x4 configuration as illustrated, the distance between holes within a group is designed to be 250 mm, and the outermost hole within a group is designed to be 125 mm apart from the end of the flooring material. Thus, when two flooring materials are installed adjacent to each other, the distance between the holes of the adjacent flooring material can be formed to be 250 mm, that is, a difference equal to the distance between holes within a group. Additionally, the distance between the outermost hole within a group and the outermost hole within another flooring material adjacent to that flooring material may be no different from the distance between holes within a group, or may differ by 5 mm or less.

[0051] This structure may be intended to provide uniform and continuous sound insulation performance across the entire floor surface when multiple flooring materials are joined together during construction. By minimizing the difference in hole positions between adjacent flooring materials, the sound insulation effect of the elastic spring (140) and the air layer is consistently maintained even at the boundary between flooring materials. This completely solves the problem of the conventional technology where sound insulation performance at the boundary is degraded due to irregular hole placement, and ensures that the same level of sound insulation effect is obtained regardless of where one walks. Furthermore, through this precise placement design, multiple flooring materials function as a single integrated sound insulation system.

[0052] Meanwhile, although not illustrated, the number of holes within a group may be 5x5, 6x6, or a larger number of holes than illustrated examples, and the number of holes may be proportional to the sound insulation performance.

[0053] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will understand that other specific forms can be easily modified without altering the technical concept or essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form.

[0054] The scope of the present invention is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the present invention. Explanation of the symbols

[0055] 100: Inter-floor noise blocking flooring 110: Waterproof surface layer 120: Sound-absorbing layer 130: Cap 131: Drainage hole 140: Elastic spring 150: Cushioning layer 151: Curved surface 152: Body part

Claims

Claim 1 A flooring material for blocking inter-floor noise, comprising: a waterproof surface layer; a sound-absorbing layer provided below the waterproof surface layer; a cushioning layer provided below the sound-absorbing layer; and a plurality of elastic springs arranged coaxially, each comprising a first elastic spring having a first elastic modulus and a second elastic spring having a second elastic modulus, wherein the first elastic spring is located on the outside and has a relatively higher elastic modulus than the second elastic spring to absorb an initial shock, and the second elastic spring is located on the inside and has a lower elastic modulus than the first elastic spring to perform a secondary cushioning action. and disposed between the sound-absorbing layer and the buffer layer to cover each of the above holes, comprising a head portion having a diameter corresponding to the diameter of the hole, a peripheral portion extending from the edge of the head portion and having a diameter larger than the diameter of the hole, and a body portion extending downward from the bottom of the head portion and having a sealed bottom, wherein the cross-section at the point where the head portion and the body portion meet is formed as a curved surface having a preset curvature, so that the head portion is inserted into the hole and fixed while pressing the elastic spring, and a sound-absorbing layer is disposed on top of the cap, so that the area between the sound-absorbing layer and the buffer layer where the cap is not disposed forms an air layer as an empty space, and a drainage hole is formed in the center of the head portion to form a water discharge path; and the flooring material is implemented as a polygonal board or tile, and a plurality of flooring materials can be joined together to be installed on the floor surface of a structure, and a fine uneven pattern is formed on the surface of any one of the layers to increase friction, and a sealing rib is formed protrudingly so that the cement mortar Inter-floor noise-blocking flooring that double-blocks water leakage. Claim 2 A floor material for blocking inter-floor noise, wherein, in claim 1, the plurality of holes are spaced apart from each other at a certain interval, and the elastic spring is formed to protrude outside each hole when inserted into the plurality of holes without any external force being applied. Claim 3 A floor sound insulation flooring according to claim 1, wherein the plurality of holes form a group, and when a group of holes is formed for each flooring material, the group is formed in the exact center of each flooring material, and the distance between the outermost hole in the group and the hole closest to the outermost hole in another flooring material adjacent to the flooring material is no different from the distance between holes within the group or has a difference of 5 mm or less. Claim 4 In paragraph 3, when the floor material is composed of a square, the shape formed by the group of holes is square, and each hole is spaced apart at equal intervals with respect to the hole placed in the center, the inter-floor noise blocking floor material. Claim 5 delete Claim 6 delete Claim 7 delete

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