KR102495825B1 - Floor structure for reducing floor impact sound - Google Patents

Abstract

The present invention relates to a floor structure for reducing floor impact sound with excellent workability while reducing floor impact sound such as weight impact sound by securing sufficient thickness according to a double mortar layer provided on top of a concrete floor slab.
The floor structure for reducing floor impact sound of the present invention includes a concrete floor slab; A base mortar layer provided on top of the floor slab; A buffer material provided on top of the base mortar layer; A finishing mortar layer provided on top of the cushioning material; and a floor panel provided on top of the finishing mortar layer. The base mortar layer and the finishing mortar layer are composed of 60 to 70 parts by weight of weight aggregate including at least one of wind-milled slag, electric furnace oxidized slag, copper slag, soft slag, ferronickel slag and blast furnace slag, and one kind 18 to 30 parts by weight of a binder containing at least one of Portland cement, 3-type Portland cement, blast furnace slag powder and alumina cement, and 1.0 to 5.0 parts by weight of an admixture B having a powder degree of 5000 to 7000 cm 2 / g and a lime gypsum-based expanding material It is prepared from a weight mortar composition containing 1.0 to 5.0 parts by weight of the admixture C containing, characterized in that the unit volume weight is 2500 to 2700 kg / ㎥, and the compressive strength based on the age of 28 days satisfies 15 to 50 MPa.

Description

Floor structure for reducing floor impact sound

The present invention relates to a floor structure for reducing floor impact sound with excellent workability while reducing floor impact sound such as weight impact sound by securing sufficient thickness according to a double mortar layer provided on top of a concrete floor slab.

Recently, the use of apartment buildings as residential buildings is becoming more common. Due to the structure of such apartment houses, generation of noise between floors is inevitable, and as disputes between neighbors increase due to this, noise between floors is emerging as a serious social problem.

Floor impact noise that causes inter-floor noise is largely classified into light impact sound caused by light and hard impact and heavy impact sound caused by heavy and soft impact.

Light impact sounds temporarily startle residents, but they do not cause reverberation, so the discomfort is relatively small. On the other hand, heavy impact noise tends to cause severe discomfort and mental pain due to residual reverberation when it is generated, which is a particularly big problem in apartment houses.

Weight impact sound, which is a low-frequency impact sound, is a noise transmitted by slab vibration, and is closely related to the dynamic characteristics of the slab due to the thickness, density, stiffness, and support conditions of the slab.

As shown in FIG. 1, in the conventional floor structure, a buffer material 200 is installed on top of a concrete floor slab 100, and a lightweight aerated concrete layer 300 and a finishing mortar layer 400 are installed on top of the buffer material 200. do.

Although the construction of such a buffer material is effective in reducing lightweight impact noise, it is difficult to exert a significant effect on reducing the weight impact sound transmitted by slab vibration.

In addition, it is difficult to expect the effect of reducing weight impact sound because the weight of lightweight aerated concrete is very light, at a level of 1/4 of that of finishing mortar. In addition, since the lightweight aerated concrete layer is porous, when pouring the finishing mortar on the top, the water loss phenomenon proceeds quickly, resulting in a problem of deterioration in the quality of the finishing mortar layer.

On the other hand, the smoothness of concrete slabs should be adjusted within 7mm per 3m, but it is not easy to match the smoothness of slabs due to the nature of the reinforced concrete method. Accordingly, when a shock absorber is directly installed on the upper surface of the concrete slab, a closed space is formed under the shock absorber, and the modulus of elasticity is increased by air, thereby increasing the floor impact sound. In addition, since there is variation in slab thickness for each generation, variation in floor impact sound performance is inevitable. In addition, the material lifting hole formed on the slab is closed by pouring concrete later. Due to the unevenness located at the boundary of the material lifting hole, lifting occurs during the construction of the buffer material, and when it is fixed with a separate fixture, the sound that the fixture transmits the floor impact sound A bridge phenomenon occurs.

KR 10-0605030 B1

In order to solve the above problems, the present invention is to provide a floor structure for reducing floor impact sound with excellent workability while reducing floor impact sound.

The present invention according to a preferred embodiment is a concrete floor slab; A base mortar layer provided on top of the floor slab; A buffer material provided on top of the base mortar layer; A finishing mortar layer provided on top of the cushioning material; and a floor panel provided on top of the finishing mortar layer. The base mortar layer and the finishing mortar layer are composed of 60 to 70 parts by weight of weight aggregate including at least one of wind-milled slag, electric furnace oxidized slag, copper slag, soft slag, ferronickel slag and blast furnace slag, and one kind 18 to 30 parts by weight of a binder containing at least one of Portland cement, 3-type Portland cement, blast furnace slag powder and alumina cement, and 1.0 to 5.0 parts by weight of an admixture B having a powder degree of 5000 to 7000 cm 2 / g and a lime gypsum-based expanding material It is prepared from a weight mortar composition containing 1.0 to 5.0 parts by weight of the admixture C containing, the unit volume weight is 2500 to 2700 kg / ㎥, and the compressive strength based on the age of 28 days is 15 to 50 MPa. Provides a floor structure for

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According to another preferred embodiment of the present invention, the weight mortar composition further includes at least one of admixture A and admixture B, wherein the admixture A is selected from among ligine sulfonate, polynaphthalene sulfonate, polymelamine sulfonate and polycarboxylate. Floor structure for reducing floor impact sound, characterized in that it includes at least one, and the admixture B includes at least one of methyl cellulose, ethyl cellulose, hydroxymethyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose and hydroxypropyl cellulose. provides

According to another preferred embodiment of the present invention, an adhesive layer for attaching the floor panel is provided between the finishing mortar layer and the floor panel, and the adhesive layer is a silicone-based adhesive and has an elongation of 100% or more. Floor structure for reducing floor impact sound provides

The present invention according to another preferred embodiment provides a floor structure for reducing floor impact sound, characterized in that a plurality of rows of valleys are formed on the top of the adhesive layer in a first direction.

In the present invention according to another preferred embodiment, the adhesive layer is provided on the upper surface of the finishing mortar layer, and the first adhesive layer, which is a silicon-based adhesive having a plurality of rows of valleys formed thereon in a first direction, and the second adhesive layer provided on top of the first adhesive layer It provides a floor structure for reducing floor impact sound, characterized in that composed of an adhesive layer.

The present invention according to another preferred embodiment provides a floor structure for reducing floor impact sound, characterized in that a plurality of rows of valleys are formed in the second direction, which is a direction orthogonal to the first direction, under the second adhesive layer.

The present invention according to another preferred embodiment provides a floor structure for reducing floor impact sound, characterized in that the second adhesive layer is pre-coated on the lower surface of the floor panel.

According to another preferred embodiment of the present invention, the buffer material is laminated on top of the lower buffer material and the lower buffer material in which a plurality of first protrusions are protruded from the lower portion and a first air layer is formed between the neighboring first protrusions. Provides a floor structure for reducing floor impact sound, characterized in that composed of an upper buffer material in which a plurality of second protrusions protrude and form a second air layer between neighboring second protrusions.

The present invention according to another preferred embodiment provides a floor structure for reducing floor impact sound, characterized in that the lower cushioning material is a hard buffering material and the upper buffering material is a soft buffering material.

The present invention according to another preferred embodiment provides a floor structure for reducing floor impact sound, characterized in that the first protrusion of the lower shock absorber has a spot shape spaced apart from each other, and the second protrusion of the upper buffer has a line shape elongated in one direction. do.

The present invention according to another preferred embodiment is a floor structure for reducing floor impact sound, characterized in that a sub-protrusion in the form of a line that is shorter in length than the second protrusion and spaced apart from the upper surface of the lower shock absorber protrudes between the second protrusions. to provide.

In the present invention according to another preferred embodiment, the first groove on one side of the grooves formed on both sides of the sub-protrusion is formed deeper than the second groove on the other side by the distance the sub-protrusion is spaced from the upper surface of the lower cushioning material, and the first groove and the width of the second groove is the same as that of the second protrusion and the sub-protrusion, respectively.

The present invention according to another preferred embodiment provides a floor structure for reducing floor impact sound, characterized in that the first protrusion and the second protrusion are eccentrically arranged so that the ground portion partially overlaps on a plane, but the central axis does not coincide with each other. do.

The present invention according to another preferred embodiment provides a floor structure for reducing floor impact sound, characterized in that a drop slab, which is a band-shaped plate, is protruded from the outer lower surface of the floor slab on the window side side.

According to the present invention, there are the following effects.

First, since a base mortar layer is additionally provided under the final finishing mortar layer, weight impact sound can be greatly reduced by securing sufficient thickness according to the double mortar layer.

Second, since the finishing mortar layer can be constructed after the construction and curing of the basic mortar layer, there is almost no water loss during the construction of the finishing mortar layer, so the quality of the finishing mortar layer is excellent.

Third, by configuring at least one of the basic mortar layer and the finishing mortar layer with a weight mortar composition, the natural frequency band of the floor structure is moved and thus the occurrence of resonance is prevented, thereby reducing the generation of noise between floors.

Fourth, when the adhesive layer is formed by applying a silicone-based adhesive instead of the conventional epoxy-based adhesive on the upper surface of the finishing mortar layer, the adhesive layer exhibits elasticity after curing, so it can absorb and attenuate external impact to reduce floor impact sound.

Fifth, when the cushioning material is composed of a lower cushioning material and an upper buffering material having protrusions formed on the lower surfaces, an air layer is formed between the neighboring protrusions to reduce floor impact sound.

1 is a cross-sectional view showing a conventional floor structure.
Figure 2 is a cross-sectional view showing a floor structure for reducing floor impact sound of the present invention.
Figure 3 is a graph showing the natural frequency of the floor structure and the frequency of the weight impact sound.
Fig. 4 is a perspective view showing a coupling relationship between floor panels;
5 is a cross-sectional view showing a floor structure for reducing floor impact sound shown in FIG. 4;
Figure 6 is a view showing the construction sequence of the floor structure for reducing floor impact sound shown in Figure 4;
7 is a view showing a construction sequence of a floor structure for reducing floor impact sound according to another embodiment.
8 is a perspective view showing an embodiment in which a second adhesive layer is pre-coated on a lower surface of a floor panel;
Fig. 9 is an enlarged sectional view showing part A of Fig. 2;
Figure 10 is a bottom perspective view showing a lower buffer material.
Figure 11 is a bottom perspective view showing an upper buffer material.
12 is a cross-sectional view showing an installation state of an upper cushioning material equipped with sub-protrusions;
13 is a view showing a disk cutting line for forming an upper buffer material.
14 is a view showing two sheets of upper buffer material formed by cutting an original plate.
Fig. 15 is a view showing the overlapping relationship between a first projection and a second projection;
16 is a cross-sectional view showing a floor structure for reducing floor impact sound provided with a drop slab.
17 is a view showing the installation position of the drop slab.
18 is a diagram showing a construction sequence of a post-construction drop slab.

Hereinafter, the present invention will be described in detail according to the accompanying drawings and preferred embodiments.

2 is a cross-sectional view showing a floor structure for reducing floor impact sound according to the present invention.

As shown in Figure 2, the floor structure for reducing floor impact sound of the present invention includes a concrete floor slab (1); A base mortar layer (2) provided on the top of the floor slab (1); A buffer material (3) provided on top of the base mortar layer (2); A finishing mortar layer (4) provided on top of the cushioning material (3); and a floor panel 6 provided on top of the finishing mortar layer 4; It is characterized by consisting of.

An object of the present invention is to provide a floor structure for reducing floor impact sound with excellent constructability while reducing floor impact sound.

In the present invention, the foundation mortar layer (2) is constructed on top of the concrete floor slab (1), which is a structure.

The basic mortar layer (2) is formed by pouring basic mortar on the top of the floor slab (1), and the floor thickness is constant before the construction of the cushioning material (3) and the top surface smoothness is uniformly matched.

It is preferable to use a mortar having high density and good fluidity as the base mortar. In particular, since the natural frequency is inversely proportional to the square root of the mass, resonance with the excitation wave of the heavy impact sound can be prevented by moving the natural frequency band of the floor to the lower side using the heavy mortar.

The buffer material 3 is provided on top of the base mortar layer 2.

A buffer material (3) is installed on the pre-cast base mortar layer (2) to form the buffer material (3) into a floor slab (1) and a floating floor structure.

The cushioning material 3 reduces floor impact sound and secures heat insulation performance.

The finishing mortar layer 4 is provided on top of the cushioning material 3.

On top of the buffer material 3, a finishing mortar layer 4 is directly constructed separately from the base mortar layer 2 without a lightweight foamed concrete layer.

Therefore, it is possible to greatly reduce the weight impact sound by securing a double mortar layer of the base mortar layer 2 and the finishing mortar layer 4.

In addition, in the past, heating pipes were installed on top of the lightweight aerated concrete layer to increase heating efficiency due to the insulation performance of the lightweight aerated concrete layer. Unlike this, in the present invention, heating efficiency is secured by the thermal insulation performance of the cushioning material 3 located under the finishing mortar layer 4 instead of the lightweight foamed concrete layer.

When the electric pipe is installed on the base mortar layer (2), the buffer material (3) can block the heat of the heating pipe to prevent the temperature around the electric pipe from exceeding the allowable temperature.

The floor panel 6 is provided on top of the finishing mortar layer 4.

The floor panel 6 may use reinforced flooring installed in a prefabricated manner without a separate adhesive or steel flooring installed by attaching to the finishing mortar layer 4 using an adhesive.

In one embodiment, it is preferable that the base mortar layer 2 has a thickness of 20 to 60 mm, the buffer material 3 has a thickness of 40 mm or more, and the finishing mortar layer 4 has a thickness of 35 to 60 mm.

The mortar constituting the base mortar layer (2) and the finishing mortar layer (4) is preferably a material with a flow range of 230 to 270 mm so that the smoothness can be adjusted through self-leveling.

3 is a graph showing the natural frequency of a floor structure and the frequency of a weight impact sound.

The base mortar layer 2 and the finishing mortar layer 4 include 60 to 70 parts by weight of a weight aggregate containing at least one of wind blast slag, electric furnace oxidized slag, copper slag, soft slag, ferronickel slag and blast furnace slag, and 18 to 30 parts by weight of a binder containing at least one of Class 1 Portland cement, Class 3 Portland cement, blast furnace slag powder and alumina cement, and 1.0 to 5.0 parts by weight of admixture B having a powder degree of 5000 to 7000 cm 2 / g and lime gypsum system It is prepared from a weight mortar composition containing 1.0 to 5.0 parts by weight of admixture C including an expansive material, so that the unit volume weight is 2500 to 2700 kg / m 3 and the compressive strength based on the age of 28 days is 15 to 50 MPa.

As shown in (a) of FIG. 3, when the natural frequency of the floor structure is the same as the excitation frequency of the weight impact sound passing through the floor structure, the vibration of the floor structure increases due to the resonance phenomenon. Therefore, by moving the natural frequency (f ₀ ) band of the floor structure, it is possible to reduce inter-floor noise by preventing such a resonance phenomenon.

The natural frequency of a structure can be expressed as:

That is, the natural frequency of a structure is inversely proportional to the square root of its mass and proportional to the square root of its stiffness. Therefore, by increasing the mass and decreasing the stiffness, the natural frequency band of the structure can be shifted to the lower side.

Accordingly, at least one of the base mortar layer (2) and the finishing mortar layer (4) is a weight mortar composition having a unit volume weight of 2500 to 2700 kg / ㎥ and a compressive strength of 15 to 50 MPa (based on age 28 days). can be manufactured

At this time, the weight mortar composition can be configured by including a weight aggregate, binder, admixture B and admixture C.

The weight aggregate may be included in an amount of 60 to 70 parts by weight based on 100 parts by weight of the weight mortar composition.

The weight aggregate is for increasing the weight of the weight mortar composition and the mortar prepared therefrom, and includes aggregate having a density of 2.9 to 4.0 g/cm 3 among KS-certified aggregates.

For example, the weight aggregate is wind-milled slag (PS Ball, about 3.8 g / cm 3), electric furnace oxidized slag (about 3.6 g / cm 3), copper slag (about 3.5 g / cm 3), and soft slag (about 3.5 g / cm 3). cm 3 ), ferronickel slag (about 3.1 g / cm 3 ) and blast furnace slag (about 2.9 g / cm 3 ).

The weight aggregate makes it possible to exert appropriate strength while weighting the mortar layer within the above numerical range.

The binder may be included in an amount of 10 to 40 parts by weight, more preferably 18 to 30 parts by weight, based on 100 parts by weight of the mortar composition.

The binder improves the viscosity and material separation resistance of the weight mortar composition within the above numerical range. The binder may have a density of 2.0 to 4.5 g/m 3 , and may include, for example, at least one of Type 1 Portland cement, Type 3 Portland cement, blast furnace slag powder, and alumina cement.

The admixture B may be included in an amount of 1.0 to 5.0 parts by weight based on 100 parts by weight of the mortar composition.

The admixture B prevents material separation and crack generation of the weight mortar composition within the above numerical range and improves workability, but does not increase strength and stiffness so that natural frequency does not increase.

The admixture B may include high-powderness limestone. For example, the high fineness limestone may have a fineness of 5000 to 7000 cm 2 /g. When using high-powder limestone having a composition and fineness within the above numerical range, it has a finer size than cement, so that it is possible to fill the microvoids formed during cement hardening, thereby improving the fluidity of the heavy mortar composition and separating materials It can be prevented.

The admixture C may be included in an amount of 1.0 to 5.0 parts by weight based on 100 parts by weight of the mortar composition.

The admixture C prevents cracking of the mortar layer prepared from the weight mortar composition within the above numerical range.

The admixture C may include a lime-gypsum-based expansion material. For example, the lime-gypsum-based expanding material may include at least one of limestone, coke, quicklime, and anhydrite. When the gypsum-lime expansive material within the above numerical range is used, it reacts chemically with water and/or cement components to exhibit initial expansion and long-term drying shrinkage reduction properties, and improve durability by improving the watertightness of the mortar.

When the mortar layer prepared by the weight mortar composition satisfies the numerical range of unit volume weight of 2500 to 2700 kg / m 3 and compressive strength of 15 to 50 MPa (based on age 28 days), the natural frequency (f ₀ ) band of the floor structure As shown in (b) of FIG. 3, it is possible to reduce inter-floor noise by moving to the lower side and preventing the occurrence of a resonance phenomenon.

In this case, the difference between the peak point frequency of the natural frequency of the floor structure including the mortar layer and the peak point frequency of the weight impact sound excitation frequency is within the range of 32 to 125 Hz, and in this range, the effect of reducing noise between floors is large.

Specifically, when the floor structure of the present invention includes the floor slab (1) and heavy mortar, 4 to 6 dB is reduced in the 63 Hz band, and when the floor slab (1) and the buffer material (3) are included, about 125 to 500 Hz is reduced. 15dB reduction was confirmed. And the floor structure, that is, in the structure including the floor slab (1) from the bottom to the top, the base mortar layer (2) made of heavy mortar, the buffer material (3) and the finishing mortar layer (4) made of heavy mortar 63 It was confirmed that the noise was significantly reduced in the band of 500Hz to 500Hz.

The weight mortar composition further includes at least one of admixture A and admixture B, wherein the admixture A includes at least one of ligine sulfonate, polynaphthalene sulfonate, polymelamine sulfonate and polycarboxylate, and the admixture B may include at least one of methyl cellulose, ethyl cellulose, hydroxymethyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose, and hydroxypropyl cellulose.

The admixture A is for increasing the unit volume weight by reducing the unit quantity of the weight mortar composition, liginine sulfonate, polynaphthalene sulfonate. It may include at least one of polymelaminesulfonate and polycarboxylate.

The admixture A is preferably included in an amount of 0.01 to 1.0 parts by weight based on 100 parts by weight of the mortar composition.

The admixture B is for improving workability by preventing material separation of the weight mortar composition, methyl cellulose, ethyl cellulose. At least one of hydroxymethylcellulose, carboxymethylcellulose, carboxyethylcellulose and hydroxypropylcellulose may be included.

The admixture B is preferably included in an amount of 0.01 to 1.0 parts by weight based on 100 parts by weight of the mortar composition.

Additionally, the weight mortar composition may further include 1 to 10 parts by weight of an organic binder based on 100 parts by weight of the weight mortar composition.

The organic binder induces bonding of each component in the weight mortar composition within the above numerical range to improve material separation resistance, thereby solving problems that may occur due to the use of weight aggregate. The organic binder may include at least one of acrylic acid, acrylic acid copolymer, vinyl acetate, vinyl acetate copolymer, polyvinyl alcohol, and ethylene vinyl acetate.

In addition, the weight mortar composition may further include 1 to 5 parts by weight of an ethylene-methyl acrylate methacrylic copolymer based on 100 parts by weight of the weight mortar composition. The ethylene-methyl acrylate methacrylic may improve the durability of the weight mortar composition and the mortar layer prepared therefrom within the above numerical range, thereby alleviating problems that may occur due to a decrease in strength.

In addition, the weight mortar composition may further include 1 to 5 parts by weight of a vinyl acetate-diethyl maleate copolymer based on 100 parts by weight of the weight mortar composition. The vinyl acetate-diethyl maleate copolymer induces bonding of each component in the mortar composition within the above numerical range to improve material separation resistance, thereby solving problems that may occur due to the use of heavy aggregate.

Hereinafter, the present invention will be described in detail by examples. The following examples are merely illustrative of the present invention, but do not limit the scope of the present invention.

preparation example

The following materials were prepared to prepare mortar compositions and mortar layers according to Examples and Comparative Examples of the present invention.

Lightweight aggregate: washed sand (sea sand) or crushed fine aggregate

Heavy Aggregate: Heavy fine aggregate with a density of 3.5~3.6 g/㎥

Binder: Portland cement with a density of 3.1±1 g/㎥

Admixture A: Fly ash with a density of 2.1±1 g/m3

Admixture B: High-powder limestone with a density of 2.9±1 g/m3

Admixture C: 2.9 ± 1 g / ㎥ density of lime-gypsum type anti-crack material

Admixture A: polycarboxylate dispersant

Admixture B: Hydroxyethylcellulose thickener

Example 1

Based on 100 parts by weight of the mortar composition, 67 parts by weight of weight aggregate, 30 parts by weight of binder, 1.0 part by weight of admixture B, 2.0 part by weight of admixture C, 0.1 part by weight of admixture A, and 0.1 part by weight of admixture B were put into a mixer and mixed to form mortar A composition was prepared.

After adding 15.5 parts by weight of water to the prepared mortar composition, it was cured to measure compressive strength and shrinkage, and a rectangular mortar layer having a size of 16 cm x 4 cm x 4 cm in width x length x height, and a diameter for measuring elastic modulus. A 10 cm x 20 cm high cylindrical mortar layer was prepared.

Example 2

Based on 100 parts by weight of the mortar composition, 67 parts by weight of weight aggregate, 25 parts by weight of binder, 6.0 parts by weight of admixture B, 2.0 part by weight of admixture C, 0.1 part by weight of admixture A, and 0.1 part by weight of admixture B were put into a mixer to prepare a mortar composition. did

After adding 15.5 parts by weight of water to the prepared mortar composition, it was cured to measure compressive strength and shrinkage, and a rectangular mortar layer having a size of 16 cm x 4 cm x 4 cm in width x length x height, and a diameter for measuring elastic modulus. A 10 cm x 20 cm high cylindrical mortar layer was prepared.

Example 3

Based on 100 parts by weight of the mortar composition, 67 parts by weight of weight aggregate, 20 parts by weight of binder, 11.0 parts by weight of admixture B, 2.0 part by weight of admixture C, 0.1 part by weight of admixture A, and 0.1 part by weight of admixture B were put into a mixer to prepare a mortar composition. did

After adding 14.5 parts by weight of water to the prepared mortar composition, it was cured to measure compressive strength and shrinkage, and a rectangular mortar layer having a size of 16 cm x 4 cm x 4 cm in width x length x height, and a diameter for measuring elastic modulus. A 10 cm x 20 cm high cylindrical mortar layer was prepared.

Comparative Example 1

Based on 100 parts by weight of the mortar composition, 75 parts by weight of lightweight aggregate, 20 parts by weight of binder, 3.0 parts by weight of admixture A, and 2.0 parts by weight of admixture C were added to a mixer and then mixed to prepare a mortar composition.

After adding 20.0 parts by weight of water to the mortar composition prepared above, curing was carried out to measure compressive strength and shrinkage, and a rectangular mortar layer having a size of 16 cm × 4 cm × 4 cm in width × length × height, for measuring elastic modulus. A cylindrical mortar layer having a diameter of 10 cm and a height of 20 cm was prepared.

Comparative Examples 2 to 7

Mortar compositions according to Comparative Examples 2 to 7 were prepared at the mixing ratios shown in Table 1 below, and mortar layers having the same size as those of Comparative Example 1 were prepared therefrom.

Mixing ratio (parts by weight) W/R
(parts by weight) lightweight
aggregate weight
aggregate binder Admixture A admixture B admixture C Admixture A Admixture B Example 1 -- 67 30 -- 1.0 2.0 0.1 0.1 15.5 Example 2 -- 67 25 -- 6.0 2.0 0.1 0.1 15.5 Example 3 -- 67 20 -- 11.0 2.0 0.1 0.1 14.5 Comparative Example 1 75 -- 20 3.0 -- 2.0 -- -- 20.0 Comparative Example 2 67 -- 30 1.0 -- 2.0 0.1 -- 17.0 Comparative Example 3 -- 70 28 -- -- 2.0 0.1 -- 15.0 Comparative Example 4 -- 60 38 -- -- 2.0 0.1 -- 17.0 Comparative Example 5 -- 67 20 -- 11.0 2.0 0.1 0.2 15.5 Comparative Example 6 -- 67 20 -- 13.0 -- 0.1 0.1 14.5 Comparative Example 7 -- 67 30 -- 1.0 2.0 0.1 -- 15.5

Experimental example

The physical properties of the mortar layers of Examples 1 to 3 and Comparative Examples 1 to 7 were tested, and the results are shown in Tables 2 and 3.

Specifically, the flow is to measure workability, and after filling the flow cone with a top diameter of 70 mm, a bottom diameter of 100 mm, and a height of 50 mm specified in KS L 5111 with the mortar composition, lift the flow cone without compaction. Flow was measured.

The unit volume weight was measured according to the KS L 5220 method, but the weight was measured by filling a 1L container with a mortar layer.

Compressive strength was measured by the KS L 5220 method (dry cement mortar).

Bleeding and material separation were measured by the KS F 2433 method (test method for bleeding rate and expansion rate of injection mortar).

The drying shrinkage rate is determined by filling a mold of 40 mm × 40 mm × 160 mm with each of the above water-mixed and mixed mortar compositions, leaving the mold at a temperature of 20 ± 2 ° C and saturated humidity for 24 hours, and then removing the mold to determine the initial length with a micrometer gauge. After curing for 28 days at a standard temperature of 20 ± 2 ° C and a humidity of 65 ± 5%, the final length of the mortar was measured, and the shrinkage length change rate of the mortar was calculated as a percentage.

In addition, impact sound reduction characteristics were performed by the method of KS F 2810 using a bang machine.

flow
(mm) unit volume
mass
(kg/m3) Compressive strength (MPa) ingredient
separation bleeding dry
Shrink
(%) modulus of elasticity
(28 days, MPa) 3 days 7 days 28 days Example 1 215 2,580 21.3 26.7 45.1 doesn't exist doesn't exist -0.023 1.74x10 ⁴ Example 2 210 2,578 13.7 18.8 30.8 doesn't exist doesn't exist -0.022 1.27x10 ⁴ Example 3 210 2,585 8.0 14.7 18.1 doesn't exist doesn't exist -0.015 1.16x10 ⁴ Comparative Example 1 210 2,120 7.2 12.2 16.3 doesn't exist has exist -0.012 0.94x10 ⁴ Comparative Example 2 215 2,170 18.6 20.6 39.6 doesn't exist has exist -0.031 1.69x10 ⁴ Comparative Example 3 235 - - - - has exist has exist - - Comparative Example 4 220 2,410 28.7 42.8 65.7 doesn't exist doesn't exist -0.050 - Comparative Example 5 180 2,540 7.5 13.7 17.7 doesn't exist doesn't exist -0.015 - Comparative Example 6 210 2,583 9.6 15.2 20.1 doesn't exist doesn't exist -0.069 - Comparative Example 7 220 2,610 22.0 26.8 39.4 doesn't exist has exist -0.023 -

Examples 1 to 3 have a high unit volume mass by using high-density fine aggregate, but have similar flows to Comparative Examples 1 and 2, but do not cause material separation or bleeding, and are similar in length change. It was confirmed that the formulation secured stability in workability and durability during practical use.

In Examples 1 to 3, the mixing amount of low-density water may be reduced by using the admixture A (dispersant) in order to maintain a high unit volume mass. Specifically, by using high-powder limestone and low-viscosity hydroxyethyl cellulose thickener, it was possible to prevent material separation and achieve high workability while maintaining low compressive strength.

In Comparative Example 1, conventionally widely used general-strength dry mortar using lightweight aggregates (maritime sand, crushed fine aggregate) was applied, and in Comparative Example 2, high-strength dry mortar was applied.

In the case of Comparative Example 3, material separation occurred largely due to the small amount of powder, and thus the measurement of physical properties was not possible.

In the case of Comparative Example 4, workability is poor due to high viscosity due to an excessive amount of binder, and the drying shrinkage rate increases due to high compressive strength, so crack generation may be large in the long term compared to Examples 1 to 3.

Comparative Example 5 has a low flow due to an increase in viscosity due to an excessive amount of admixture B (thickener), and a decrease in workability compared to Examples 1 to 3 may occur.

In Comparative Example 6, the drying shrinkage rate was three or more times higher than that of Examples 1 to 3, as the crack-preventing material was not mixed, and cracking may be large.

In Comparative Example 7, bleeding occurred as the thickener was not mixed, and surface strength may be weakened.

In Examples 1 to 3 and Comparative Examples 1 to 2, the compressive strength value was found to be correlated with the elastic modulus, and the unit volume mass and compressive strength numerical range and It was confirmed that when the elastic modulus of 1.0 × 10 ⁴ to 1.8 × 10 ⁴ is satisfied, interlayer noise can be reduced, and at the same time, workability, material separation characteristics, bleeding characteristics and drying shrinkage characteristics can be improved.

As described above, the mortar layer prepared from the mortar composition prepared in the present invention has a unit volume weight of 2,600 ± 100 kg / m 3 and a compressive strength of 15 to 50 MPa based on the age of 28 days, and accordingly, the floor structure As the natural frequency (f _o ) band moves as shown in (b) of FIG. 3, the occurrence of resonance is prevented, thereby reducing the generation of noise between floors, and at the same time, workability, material separation characteristics, bleeding characteristics and drying shrinkage characteristics are improved. can be improved

4 is a perspective view showing the coupling relationship of floor panels, FIG. 5 is a cross-sectional view showing a floor structure for reducing floor impact sound shown in FIG. 4, and FIG. 6 is a construction of the floor structure for reducing floor impact sound shown in FIG. It is a diagram showing the order.

As shown in FIGS. 4 to 6, an adhesive layer 5 for attaching the floor panel 6 is provided between the finishing mortar layer 4 and the floor panel 6, and the adhesive layer 5 is made of silicone. The elongation of the adhesive may be 100% or more.

The floor panel 6, such as a steel floor, was previously attached to the top of the finishing mortar layer using an epoxy-based adhesive. However, epoxy-based adhesives have a property of hardening when the adhesive is hardened after construction, and there is a problem in that the impact force generated on the floor is transmitted to the lower frame as it is.

Therefore, a silicon-based adhesive may be used as the adhesive layer 5 instead of the conventional epoxy-based adhesive.

The adhesive layer 5 is a one-component, room temperature moisture-curing adhesive formulated using a modified silane polymer using organosilane as a main raw material as a polymer crosslinking agent, and is a one-component hybrid sealant-based adhesive that is cured by reacting with moisture in the air.

The adhesive layer 5 exhibits elastic properties after curing, and thus exhibits a damping effect of absorbing and attenuating external impact.

As a result of the weight impact sound test using a bang machine for a real house, when the floor was attached with the existing epoxy bond, 1.37dB was reduced compared to the mortar surface before the floor was attached, whereas when silicone adhesive was used, it was found to be reduced by 1.66dB. .

In addition, the adhesive layer 5 using the silicon-based adhesive has an excellent ability to maintain adhesive strength even when the floor panel 6 is deformed, and is environmentally friendly because it emits almost no methanol.

The adhesive layer 5 has a viscosity of 50,000 to 200,000 CPS before curing, and after curing, it hardens into a rubbery form and has a Shore A hardness of about 20 to 40 degrees and an adhesive tensile strength of 0.9 N/mm or more.

The floor panel 6 may be made of various materials such as hardwood floors, reinforced floors, wooden floors, ceramic tiles, plastic tiles, and PVC.

The adhesive layer 5 made of a silicone-based adhesive reduces floor impact sound by elasticity, and a physical property representing elasticity of the material is elongation of the adhesive layer 5.

Here, the elongation means the rate at which the material stretches when the material is stretched.

If the elongation is less than 100%, it is shown that sufficient floor impact sound reduction effect is not exhibited, so the elongation of the adhesive layer 5 is preferably at least 100% or more.

The construction sequence of the floor structure for reducing floor impact sound of the present invention will be described with reference to FIG. 6 as follows.

First, as shown in (a) of FIG. 6, the finishing mortar layer 4 is placed and cured on top of the buffer material 3. And, as shown in (b) of FIG. 6, an adhesive layer 5 is formed by applying a silicone-based adhesive to the upper surface of the finishing mortar layer 4. Thereafter, as shown in (c) of FIG. 6, the floor panel 6 is attached to the top of the adhesive layer 5 to finish.

As shown in FIGS. 4 and 5 , a plurality of rows of valleys 51 may be formed on the adhesive layer 5 in the first direction.

By forming valleys 51 in the adhesive layer 5, which is an elastic material, an air layer is positioned between the valleys 51 and the valleys 51, thereby improving floor impact sound reduction performance.

It is preferable that the valley 51 of the adhesive layer 5 has a depth of 3 mm or more.

To this end, a silicon-based adhesive for forming the adhesive layer 5 is applied on the top of the finishing mortar layer 4, and then the upper surface is scraped using a scraper (hera) having a groove of 5 mm or more in height to form a valley 51 of sufficient depth. can form

Protrusions 22 are naturally formed between neighboring valleys 51 .

7 is a view showing a construction sequence of a floor structure for reducing floor impact sound according to another embodiment.

As shown in FIG. 7, the adhesive layer 5 is provided on the upper surface of the finishing mortar layer 4, and includes a first adhesive layer 5a, which is a silicon-based adhesive having a plurality of rows of valleys 51a formed thereon in a first direction, and It may be composed of a second adhesive layer 5b provided on top of the first adhesive layer 5a.

In order to maximize the damping performance of the adhesive layer (5), a silicon-based adhesive is pre-coated on the top of the finishing mortar layer (4) to form a first adhesive layer (5a), and after curing, a separate agent is applied on top of the first adhesive layer (5a) 2 The adhesive layer 5b can be formed.

The floor panel 6 is attached by a second adhesive layer 5b.

The second adhesive layer 5b may use an existing epoxy-based adhesive or a silicon-based adhesive of the same material as the first adhesive layer 5a.

When the second adhesive layer 5b is constructed on the top of the first adhesive layer 5a, the second adhesive layer 5b has the first adhesive layer 5b formed with the valleys 51a so that the valleys 51a of the first adhesive layer 5a can be maintained. It can be applied after curing the adhesive layer (5a).

When the adhesive layer 5 is composed of the first adhesive layer 5a and the second adhesive layer 5b, the construction sequence of the floor structure for reducing floor impact noise according to the present invention will be described with reference to FIG. 7 .

First, as shown in (a) of FIG. 7, the finishing mortar layer 4 is arranged and cleaned. And as shown in (b) of FIG. 7, a silicone-based adhesive is applied to the upper surface of the finishing mortar layer 4 to form a first adhesive layer 5a, and the cured first adhesive layer 5a is placed on top of the first adhesive layer 5a (c of FIG. 7). ) to form the second adhesive layer 5b.

Then, as shown in (d) of FIG. 7, the floor panel 6 is attached to the top of the adhesive layer 5 to finish the construction.

8 is a perspective view illustrating an embodiment in which a second adhesive layer is pre-coated on a lower surface of a floor panel.

As shown in FIG. 8 , a plurality of rows of valleys 51b may be formed under the second adhesive layer 5b in a second direction perpendicular to the first direction.

In addition to the valleys 51a of the first adhesive layer 5a, valleys 51b are formed in the second adhesive layer 5b to maximize the performance of reducing floor impact sound by the adhesive layer 5, so that a sufficient air layer is formed. can

In particular, in order to prevent the air between the valleys 51a and 51b from escaping to the outside by the upper pressure and evenly block the transmission of floor impact sound in all directions, the first adhesive layer 5a and the second adhesive layer 5b are formed. The valleys 51a and 51b may be formed in directions orthogonal to each other to form a lattice shape.

In this case, it is preferable to use the same material as the silicone-based adhesive for the second adhesive layer 5b as the first adhesive layer 5a.

As shown in FIG. 8 , the second adhesive layer 5b may be pre-coated on the lower surface of the floor panel 6 .

In order to secure the damping performance by the valleys 51a and 51b of the first adhesive layer 5a and the second adhesive layer 5b formed in directions orthogonal to each other, the valleys 51a of the first adhesive layer 5a and the valleys 51a of the second adhesive layer (5b) It is preferable that the valleys 51b of 5b) face each other.

That is, it is preferable that the valleys 51a of the first adhesive layer 5a are formed on the upper side and the valleys 51b of the second adhesive layer 5b are formed on the lower side.

However, when forming a valley by a scraper after applying the adhesive in the field, it is possible to form a valley only on the top of the adhesive layer (5).

In addition, when the adhesive is applied to form the second adhesive layer 5b on the upper portion of the first adhesive layer 5a, the adhesive penetrates into the valleys 51a of the lower first adhesive layer 5a so that a sufficient air layer may not be formed. can

Therefore, when the floor panel 6 is manufactured in a factory, an adhesive for forming the second adhesive layer 5b may be applied to the lower surface of the floor panel 6 in advance to form a valley 51b at the bottom.

In addition, the valleys 51a and 51b of the first adhesive layer 5a and the second adhesive layer 5b may face each other by field construction of the first adhesive layer 5a.

Since the valleys 51b of the second adhesive layer 5b are applied in a cured state, the shape of the valleys 51b is maintained intact even after construction.

9 is an enlarged cross-sectional view illustrating part A of FIG. 2 .

As shown in FIGS. 2 and 9, the cushioning material 3 has a plurality of first protrusions 311 protruding from the lower portion, and a first air layer 310 is formed between the neighboring first protrusions 311. A plurality of second protrusions 321 are protruded from the lower portion of the lower cushioning material 31 and are laminated on the upper portion of the lower cushioning material 31 to form a second air layer 320 between the neighboring second protrusions 321. It may be composed of an upper buffer material (32).

The buffer material 3 may be composed of a lower buffer material 31 at the lower part and an upper buffer material 32 at the upper part.

A plurality of first protrusions 311 and second protrusions 321 are protruded from the lower surfaces of the lower shock absorber 31 and the upper shock absorber 32, respectively.

Each protrusion is spaced apart from each other, and a first air layer 310 is formed between adjacent first protrusions 311 and a second air layer 320 is formed between adjacent second protrusions 321 .

Therefore, the shock excitation from the upper part is offset by the double air layer of the second air layer 320 and the first air layer 310 formed at the upper and lower portions, so that floor impact sound can be effectively reduced.

A finishing mortar layer 4 is provided on top of the upper buffer material 32 .

The lower cushioning material 31 may be composed of a hard cushioning material, and the upper buffering material 32 may be composed of a soft cushioning material.

Soft cushioning materials such as EPS, which are commonly used as buffering materials (3), are excellent in reducing floor impact sound by themselves. However, the soft cushioning material has a large deflection and residual deformation under load, so if it forms a floor structure by itself, its usability is poor. For example, EPS has a density of only 16 kg/m3, which causes large deformation under local load.

In contrast, hard shock absorbers rarely experience deflection or residual deformation, but have a high dynamic elastic modulus and have poor floor impact sound reduction performance, making them unsuitable for use alone as a shock absorber. For example, EVA (ethylene-vinyl acetate copolymer; ethylene-vinyl acetate copolymer) is a polymer obtained by copolymerizing ethylene and vinyl acetate monomers, and has a high dynamic elastic modulus, resulting in poor floor impact sound reduction performance at 125 Hz.

Therefore, by forming the shock absorber 3 by combining the soft and hard shock absorbers vertically, it is possible to minimize deflection while reducing the transmission of floor impact sound.

That is, the soft cushioning material reduces the floor impact sound by the impact sound reduction performance of the soft material itself and the air layer between the protrusions.

In this way, when the cushioning material 3 is constituted by combining the soft cushioning material and the hard buffering material, the thickness of the soft buffering material can be reduced compared to conventional single-material buffering materials, thereby minimizing problems caused by deflection and residual deformation. At this time, since the decrease in impact sound reduction performance due to the decrease in the thickness of the soft shock absorber is compensated by the air layer under the hard shock absorber, sufficient impact sound reduction performance can be exhibited as a whole.

If the soft cushioning material is provided in the lower part and the hard buffering material is provided in the upper part, deflection occurs in the soft cushioning material in the lower part due to the pressure of the protrusion of the hard buffering material. As a result, the protrusions of the hard cushioning material are buried in the soft buffering material, so that a sufficient air layer is not formed.

Therefore, the lower buffer material 31 is composed of a hard buffer material and the upper buffer material 32 is composed of a soft buffer material, so that the first air layer 310 and the second air layer 320 are sufficiently secured while minimizing deformation of the floor structure. Impact noise can be reduced.

In particular, it is possible to first reduce vibration in the upper shock absorber 32 for an upper impact, and minimize vibration transmitted to the lower portion by the second protrusion 321 of the upper shock absorber 32 .

The lower cushioning material 31 may be made of EVA. EVA has a dense material structure with a density of 50kg/m3. Accordingly, even when a large load is applied compared to the ground area, the repulsive force and bearing capacity are high.

The upper buffer material 32 may be composed of EPS. EPS has excellent shock absorption performance due to its low elasticity. In addition, the insulation performance of the floor structure can be secured by using EPS.

10 is a bottom perspective view showing a lower buffer, and FIG. 11 is a bottom perspective view showing an upper buffer.

As shown in FIGS. 10 and 11, the first protrusions 311 of the lower cushioning material 31 are in the form of spots spaced apart from each other, and the second protrusions 321 of the upper cushioning material 32 are a line formed long in one direction. can be in the form

The lower shock absorber 31 is a hard shock absorber and has excellent load bearing performance, but somewhat inferior impact sound reduction performance.

Therefore, the first protrusion 311 of the lower shock absorber 31 is formed in the form of a spot spaced apart from each other in the longitudinal and lateral directions to minimize the contact area with the lower part, and the first air layer 310 between the first protrusions 311 ) can be configured to effectively dissipate the floor impact sound by making it communicate as a whole.

Since the lower cushioning material 31 has excellent bearing capacity, even if the first protrusions 311 are formed in the form of spots spaced apart from each other, there is little residual deformation or sagging.

In particular, since EVA is easy to mold by compression molding, when EVA is used as the lower cushioning material 31, it is easy to form the first protrusions 311 protruding independently of each other.

The plurality of first protrusions 311 may be arranged non-directionally to maximize vibration dissipation performance. That is, the plurality of first protrusions 311 are not provided in the same row, but are randomly arranged to be offset from each other to increase the path of the inner air layer, thereby maximizing the dissipation capability during impact sound action.

The upper cushioning material 32 is a soft cushioning material, and deflection and residual deformation increase when the contact area is insufficient.

Therefore, the second protrusion 321 of the upper cushioning material 32, which is a soft cushioning material, may be formed in the form of a continuous line in one direction.

In particular, EPS can be manufactured into a desired cross-sectional shape by cutting a thick EPS panel by hot wire cutting. At this time, if the second protrusion 321 is formed in a line shape, the upper and lower cushioning materials divided by cutting can be formed symmetrically with each other, so that two upper cushioning materials 32 can be produced from one panel without material loss.

12 is a cross-sectional view showing an installed state of an upper cushioning material equipped with sub-protrusions.

As shown in FIG. 12, between the second protrusions 321, a sub-protrusion 322 in the form of a line that is shorter in length than the second protrusion 321 and spaced apart from the upper surface of the lower cushioning material 31 protrudes. can

In order to maximize impact sound reduction performance, it is advantageous to maximize the second air layer 320 while minimizing the contact area with the lower shock absorber 31 by maximizing the distance between neighboring second protrusions 321 .

However, in this case, the upper cushioning material 32, which is a soft buffering material, inevitably causes sagging and residual deformation.

In addition, when only the second protrusion 321 is formed, in order to manufacture two upper cushioning materials 32 by dividing the EPS panel original plate vertically, the gap between the width of the second protrusion 321 and the neighboring second protrusion 321 The width of the grooves should be the same. In this case, since the volume ratio between the second protrusion 321 and the second air layer 320 is only 1:1, the space in the air layer is not sufficient, and the contact area of the second protrusion 321 is large, so the floor impact sound reduction effect is insufficient.

Therefore, sub-protrusions 322 having a shorter protruding length than the second protrusions 321 may be provided between adjacent second protrusions 321 to minimize the contact area and prevent sagging.

As shown in (a) of FIG. 12, when the sub-protrusion 322 is provided on the upper buffer material 32, when a load is applied to the upper part, the deflection occurs at the loading point of the upper buffer material 32 as shown in (b) of FIG. As a result, the sub-protrusion 322 droops downward and is supported on the upper surface of the lower cushioning material 31, so that no more sagging occurs.

To this end, it is preferable to configure the protrusion length difference between the second protrusion 321 and the sub-protrusion 322 to be within 3 mm, which is the allowable deflection amount of the cushioning material.

The second protrusion 321 and the sub-protrusion 322 may be formed in a line shape parallel to each other.

A plurality of sub-protrusions 322 may be formed between the second protrusions 321 .

13 is a view showing a disc cutting line for forming an upper buffer material, and FIG. 14 is a view showing two upper buffer materials formed by cutting a disc.

As shown in FIGS. 13 and 14, the first groove 323 on one side of the grooves formed on both sides of the sub-protrusion 322 is a lower buffer material than the second groove 324 on the other side. 31), and the width of the first groove 323 and the second groove 324 is the same as that of the second protrusion 321 and the sub-protrusion 322, respectively. can

In the embodiments of FIGS. 13 and 14, the size of the protrusions on the drawing is exaggerated compared to the size of the protrusions in the actual cushioning material for better understanding.

If the sub-protrusion 322 is simply formed at the center of the second protrusion 321 to be left-right symmetrical, the upper and lower cushioning materials formed when one EPS disc is cut are asymmetrical to each other. Accordingly, any one side plate cannot be used as the upper buffer material 32, resulting in material loss.

Therefore, when the upper buffer material 32 is produced by cutting the EPS original plate, the upper and lower buffer materials produced are asymmetric in the horizontal direction but symmetrical in the vertical direction, so that material loss can be prevented.

To this end, the first groove 323 formed on one side (right side in the drawing) of the grooves on both sides of the sub-protrusion 322 is deeper than the second groove 324 formed on the other side (left side in the drawing).

Accordingly, the first groove 323 of the upper cushioning material 32 on one side (upper side in the drawing) formed by cutting the disk corresponds to the second protrusion 321' of the upper cushioning material 32' on the other side (lower side in the drawing). , The second groove 324 of the upper cushioning material 32 on one side corresponds to the sub-protrusion 322' of the upper buffering material 32' on the other side.

In the same way, the second protrusion 321 of the upper cushioning material 32 on one side corresponds to the first groove 323' of the upper cushioning material 32' on the other side, and the sub-protrusion 322 of the upper buffering material 32 on one side corresponds to the second protrusion 322 of the upper cushioning material 32 on the other side. It corresponds to the second groove part 324' of the upper cushioning material 32'.

At this time, the depth of the bottom surface of the first groove part 323 and the bottom surface of the second groove part 324 based on the sub-protrusion 322 in the center in order to make the shape of the upper buffer material 32 on one side and the upper buffer material 32' on the other side the same. The difference (h ₁ ) may be formed to be the same as the distance difference (h ₂ ) between the front surface of the sub-protrusion 322 and the front surface of the second protrusion 321 .

In addition, in relation to the widths of the protrusions and grooves, the width of the first groove 323 is the same as that of the second protrusion 321, and the width of the second groove 324 is equal to the width of the sub-protrusion 322. can be formed in the same way. In the case where the side surfaces of the protrusions and grooves are inclined, they may be formed based on the average width.

15 is a view showing the overlapping relationship between a first protrusion and a second protrusion.

As shown in FIG. 15 , the first protruding part 311 and the second protruding part 321 may be eccentrically arranged such that their center axes do not coincide with each other while their grounding parts partially overlap each other on a plane.

When the position of the second protrusion 321 is located in the groove between the neighboring first protrusions 311 at the bottom, the pressure of the second protrusion 321 increases the deformation of the lower cushioning material 31 and increases the amount of deflection. .

Accordingly, the amount of deflection can be minimized by forming the second protrusion 321 to partially overlap the first protrusion 311 on a plane to be structurally supported.

However, if the respective central axes of the second protrusion 321 and the first protrusion 311 are equally positioned on a straight line, the floor impact sound flows downward through the second protrusion 321 and the first protrusion 311 as it is. can be conveyed

Accordingly, the second protrusion 321 and the first protrusion 311 may be arranged eccentrically so that their central axes are shifted, thereby minimizing transmission of impact sound.

In this case, it is preferable to form the first protrusion 311 with a circular cross section so that the eccentric distance between the second protrusion 321 and the first protrusion 311 can be reduced to control deflection and at the same time minimize the overlapping area to reduce transmission of impact sound. do.

16 is a cross-sectional view showing a floor structure for reducing floor impact sound provided with drop slabs, FIG. 17 is a view showing the installation position of drop slabs, and FIG. 18 is a view showing the construction sequence of post-construction drop slabs.

As shown in FIG. 16, a drop slab 11, which is a band-shaped plate, may protrude from the lower surface of the floor slab 1 on the window side.

In general, multi-unit dwellings use a wall structure that supports the load of a slab by a load-bearing wall such as an outer wall, an inter-household wall, or an inner wall of a household. In this case, since a wall having high rigidity is integrally provided and supported at the lower part of the slab, static deflection of the slab is reduced, and accordingly, a vibration displacement value when an impact occurs is also reduced.

However, a large veranda window is placed on one side of the living room, where most of the residents' activities occur. Therefore, when vibration occurs because there is no load-bearing wall or the amount of wall is very small, the characteristics of the vibration mode appear differently on the window side. In addition, since a slab with a relatively large area is supported on one side without a load-bearing wall, static deflection of the floor slab inevitably occurs, and a large vibration displacement value occurs when an impact occurs.

Therefore, by having the drop slab 11, which is a band-shaped plate, integrally provided on the lower side of the floor slab 1 on the side of the window that is not supported by the load-bearing wall, especially on the veranda side, the slab thickness can be increased to change the primary vibration mode characteristics of the slab. can

Accordingly, it is possible to effectively reduce floor impact sound by controlling static deflection and vibration displacement values.

The drop slab 11 has a - shape disposed at the lower portion of the balcony side as shown in FIG. 17 (a), an L-shape disposed at the balcony side and the load-bearing wall side as shown in FIG. 17 (b), and FIG. 17 (c) and Likewise, it may be provided in a square shape or the like disposed throughout the periphery of the living room slab.

Table 3 below is a table showing single numerical evaluation quantities (SNQ) evaluated by performing numerical analysis on vibration and sound according to the presence and absence of the drop slab 11 and each type.

1/1
Octave general structure
(flat slab) drop slab
(ㅡ-shape) drop slab
(B shape) drop slab
(ㅁ shape) 31.5 82.0 84.6 84.6 83.6 63 81.5 79.9 79.3 78.5 125 62.6 61.6 61.6 61.6 250 56.2 55.9 55.7 54.9 500 41.5 51.5 41.5 41.5 SNQ 51 50 49 49 Chain - -One -2 -2

It can be seen from Table 3 that when the drop slab 11 is installed, the single numerical evaluation amount is reduced compared to the general flat slab.

In particular, the ㄱ-shaped and ㅁ-shaped drop slabs were found to have a great effect on reducing inter-floor noise as the single numerical evaluation amount was reduced by 2dB.

It is preferable to construct the drop slab 11 with a width of 450 mm and a thickness of 30 mm based on the thickness of the floor slab (1) of 210 mm in order to sufficiently exhibit the effect of reducing floor impact sound and avoid interference with the lower finish of the floor slab (1). .

Referring to FIG. 18, when the drop slab 11 is post-constructed on the existing slab 1, the construction sequence will be described.

As shown in (a) of FIG. 18, the lower surface of the floor slab 1 on which the drop slab 11 is to be constructed is divided to a depth of 6 mm or more.

And, as shown in (b) of FIG. 18, the concrete pouring inlet 12 is cored on the floor slab 1, and the formwork 13 is installed on the lower part of the floor slab 1.

Thereafter, as shown in (c) of FIG. 18, the non-shrinkage mortar 110 is injected through the injection port 12, cured, and the formwork 13 is demolded to form a floor slab 1 as shown in (d) of FIG. A drop slab 11 is formed at the bottom.

1: floor slab 11: drop slab
110: non-shrinkage mortar 12: inlet
13: formwork 2: basic mortar layer
3: buffer material 31: lower buffer material
310: first air layer 311: first protrusion
32: upper buffer 320: second air layer
321: second protrusion 322: sub protrusion
323: first groove 324: second groove
4: finishing mortar layer 5: adhesive layer
5a: first adhesive layer 5b: second adhesive layer
51, 51a, 51b: Valley 52, 52a, 52b: Protrusion
6: Floor panel

Claims (15)

concrete floor slab (1);
A base mortar layer (2) provided on the top of the floor slab (1);
A buffer material (3) provided on top of the base mortar layer (2);
A finishing mortar layer (4) provided on top of the cushioning material (3); and
a floor panel (6) provided on top of the finishing mortar layer (4); consists of,
The base mortar layer 2 and the finishing mortar layer 4 include 60 to 70 parts by weight of a weight aggregate containing at least one of wind blast slag, electric furnace oxidized slag, copper slag, soft slag, ferronickel slag and blast furnace slag, and 18 to 30 parts by weight of a binder containing at least one of Class 1 Portland cement, Class 3 Portland cement, blast furnace slag powder and alumina cement, and 1.0 to 5.0 parts by weight of admixture B having a powder degree of 5000 to 7000 cm 2 / g and lime gypsum system A floor characterized in that it is prepared from a weight mortar composition containing 1.0 to 5.0 parts by weight of admixture C including an expansive material, has a unit volume weight of 2500 to 2700 kg / m 3, and a compressive strength of 15 to 50 MPa based on age 28 days Floor structure for reducing impact noise.
delete In paragraph 1,
The weight mortar composition further includes at least one of admixture A and admixture B,
The admixture A includes at least one of ligine sulfonate, polynaphthalene sulfonate, polymelamine sulfonate and polycarboxylate,
The admixture B is a floor structure for reducing floor impact sound, characterized in that it contains at least one of methyl cellulose, ethyl cellulose, hydroxymethyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose and hydroxypropyl cellulose.
In paragraph 1,
An adhesive layer (5) for attaching the floor panel (6) is provided between the finishing mortar layer (4) and the floor panel (6), and the adhesive layer (5) is a silicon-based adhesive and has an elongation of 100% or more. Characterized in that Floor structure for reducing floor impact noise.
In paragraph 4,
Floor structure for reducing floor impact sound, characterized in that a plurality of rows of valleys 51 are formed in the first direction on the top of the adhesive layer (5).
In paragraph 4,
The adhesive layer 5 is provided on the upper surface of the finishing mortar layer 4, and consists of a first adhesive layer 5a, which is a silicon-based adhesive having a plurality of rows of valleys 51a formed thereon in a first direction, and the first adhesive layer 5a. Floor structure for reducing floor impact sound, characterized in that composed of a second adhesive layer (5b) provided on the top.
In paragraph 6,
Floor structure for reducing floor impact sound, characterized in that a plurality of rows of valleys (51b) are formed in a second direction, which is a direction orthogonal to the first direction, under the second adhesive layer (5b).
In paragraph 7,
Floor structure for reducing floor impact sound, characterized in that the second adhesive layer (5b) is pre-coated on the lower surface of the floor panel (6).
In paragraph 1,
The shock absorber 3 includes a lower shock absorber 31 in which a plurality of first protrusions 311 are protruded from the lower portion and a first air layer 310 is formed between the adjacent first protrusions 311 and the lower shock absorber 31 ), characterized in that it is composed of an upper buffer material 32 in which a plurality of second protrusions 321 are protruded from the bottom and a second air layer 320 is formed between neighboring second protrusions 321. Floor structure for reducing floor impact sound.
In paragraph 9,
The floor structure for reducing floor impact sound, characterized in that the lower buffer material (31) is a hard buffer material, and the upper buffer material (32) is a soft buffer material.
In paragraph 10,
The first protrusion 311 of the lower shock absorber 31 is in the form of a spot spaced apart from each other, and the second protrusion 321 of the upper shock absorber 32 is in the form of a line long in one direction. structure.
In paragraph 11,
Between the second protrusions 321, a sub-protrusion 322 in the form of a line that is shorter in length than the second protrusion 321 and spaced apart from the upper surface of the lower shock absorber 31 is formed to protrude, for reducing floor impact sound. floor structure.
In paragraph 12,
Among the grooves formed on both sides of the sub-protrusion 322, the first groove 323 on one side is deeper than the second groove 324 on the other side by the distance between the sub-protrusion 322 and the upper surface of the lower cushioning material 31. The floor structure for reducing floor impact sound, characterized in that the width of the first groove 323 and the second groove 324 is the same as that of the second protrusion 321 and the sub-protrusion 322, respectively.
In paragraph 11,
The first protrusion 311 and the second protrusion 321 are floor structure for reducing floor impact sound, characterized in that the ground portion partially overlaps on a plane, but is eccentrically arranged so that their central axes do not coincide with each other.
In paragraph 1,
A floor structure for reducing floor impact sound, characterized in that a drop slab (11), which is a band-shaped plate, is protruded from the outer lower surface of the floor slab (1) on the window side.

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