KR20230095528A - Composite floor system for reducing interlayer noise - Google Patents

Abstract

The present invention controls the resonance by suppressing the plate vibration of the floor structure by installing a ventilation hole through which the inside and outside of the floor structure communicates, while synthesizing a first slab that plays a structural role and a second slab for increasing the weight of the slab. A synthetic floor system for reducing noise between floors using an air permeable floor structure for controlling low frequency resonance capable of reducing weight impact noise without increasing the overall thickness of the floor structure.
The synthetic floor system for reducing inter-floor noise using the breathable floor structure for controlling low-frequency resonance of the present invention is for reducing inter-floor noise in an apartment house, and includes a first slab and a second cement composite in which reinforcing bars are placed inside the first cement composite. A composite slab composed of a second slab that is unrooted and placed on top of the slab; a buffer panel provided on top of the composite slab; and a finishing mortar layer provided on an upper portion of the buffer panel and having ventilation holes passing through the top and bottom of the buffer panel. It is characterized by consisting of.

Description

Composite floor system for reducing interlayer noise using a breathable floor structure for controlling low frequency resonance {Composite floor system for reducing interlayer noise}

The present invention controls the resonance by suppressing the plate vibration of the floor structure by installing a ventilation hole through which the inside and outside of the floor structure communicates, while synthesizing a first slab that plays a structural role and a second slab for increasing the weight of the slab. A synthetic floor system for reducing noise between floors using an air permeable floor structure for controlling low frequency resonance capable of reducing weight impact noise without increasing the overall thickness of the floor structure.

Recently, as apartment buildings have become common as residential buildings, noise between floors has emerged as a serious social problem, such as increasing disputes between neighbors due to noise between floors between households.

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 have reverberation and cause relatively little discomfort, whereas heavy impact sounds tend to leave reverberations and cause severe discomfort and mental pain, 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.

Conventionally, in order to prevent noise between floors of apartment houses, a buffer material, a mortar layer, and a finishing material were sequentially stacked on top of a concrete slab (Patent Publication No. 10-2018-0029335, etc.).

However, although the construction of the buffer material is effective in reducing the light weight impact sound, there is a limit to the reduction of the weight impact sound transmitted by the vibration of the slab plate.

In particular, in such a floor structure, a buffer material is provided between the concrete slab and the mortar layer. Here, the concrete slab and the mortar layer are shielding members, and the air present in the micropores inside the cushioning material is trapped between the lower concrete slab and the upper mortar layer. Accordingly, when the upper floor is excited, the plate vibration of the upper mortar layer is transmitted to the lower concrete slab layer by the trapped air, thereby reducing the impact sound reduction effect by half.

On the other hand, in order to block floor impact sound, the floor thickness is limited to 210 mm or more for wall-type or non-removable plate structures and 150 mm or more for ramen structures, and the performance of the cushioning material installed on the floor structure to absorb impact sound is reduced. It is regulated to be less than 58dB for impact sound and less than 50dB for heavy impact sound.

These regulations mean that the slab thickness has a great relationship with the floor impact sound, especially the weight impact sound.

However, even if the floor thickness is further increased beyond 210 mm, the impact sound blocking performance effect is very limited.

In addition, when the thickness of the concrete slab is increased to reduce the impact sound, it is difficult to secure a floor height and the amount of concrete increases, which reduces economic feasibility.

In order to solve the above problems, the present invention is for reducing inter-floor noise using a low-frequency resonance control breathable floor structure capable of controlling resonance by suppressing plate vibration of the floor structure by installing a ventilation hole through which the inside and outside of the floor structure communicates It is intended to provide a composite floor system.

The present invention is for reducing inter-floor noise using a breathable floor structure for controlling low-frequency resonance capable of reducing weight impact noise without increasing the overall thickness of the floor structure by synthesizing a second slab for increasing the weight of the slab on top of the first slab that plays a structural role. It is intended to provide a composite floor system.

The present invention according to a preferred embodiment is for reducing inter-floor noise in apartment houses, with a first slab and a second cement composite in which reinforcing bars are placed inside the first cement composite, and the second cement composite is unrooted and placed on top of the first slab. composite slabs made up of slabs; a buffer panel provided on top of the composite slab; and a finishing mortar layer provided on an upper portion of the buffer panel and having ventilation holes passing through the top and bottom of the buffer panel. It provides a synthetic floor system for reducing inter-floor noise using a breathable floor structure for controlling low-frequency resonance, characterized in that composed of.

The present invention according to another preferred embodiment provides a synthetic floor system for reducing inter-floor noise using an air permeable floor structure for controlling low-frequency resonance, characterized in that the second slab is formed of a weight cement composite having a unit weight of 2300 kg / m or more .

According to another preferred embodiment, the present invention provides a synthetic floor system for reducing noise between floors using an air permeable floor structure for controlling low-frequency resonance, characterized in that the finishing mortar layer is formed by weight mortar having a unit weight of 2300 kg/m or more.

According to another preferred embodiment, the present invention provides a synthetic floor system for reducing inter-floor noise using an air permeable floor structure for controlling low-frequency resonance, characterized in that the upper surface of the first slab is roughened.

According to another preferred embodiment, the present invention provides a synthetic floor system for reducing noise between floors using an air permeable floor structure for controlling low-frequency resonance, characterized in that the ventilation holes penetrate the buffer panel and are formed to communicate with each other in the buffer panel and the finishing mortar layer. do.

According to another preferred embodiment of the present invention, a plurality of protrusions are protruded from the lower portion of the buffer panel, an air layer is formed between neighboring protrusions, and the ventilation hole is a breathable floor structure for controlling low-frequency resonance, characterized in that in communication with the air layer. It provides a synthetic floor system for reducing inter-floor noise using.

According to another preferred embodiment, the present invention provides a synthetic floor system for reducing interfloor noise using an air permeable floor structure for controlling low frequency resonance, characterized in that the vent hole is formed by a guide pipe buried inside the finishing mortar layer.

According to another preferred embodiment of the present invention, the lower end of the guide tube is configured to pass through the buffer panel, and a plurality of ventilation holes opened toward the buffer panel are formed through the lower outer circumferential surface of the guide tube. Provided is a synthetic floor system for reducing noise between floors using a floor structure.

According to another preferred embodiment, the present invention provides a synthetic floor system for reducing inter-floor noise using an air permeable floor structure for controlling low-frequency resonance, characterized in that the lower part of the guide pipe is configured such that the diameter becomes narrower toward the lower part.

In the present invention according to another preferred embodiment, a side buffer is formed between the side end of the buffer panel and the finishing mortar layer and the wall, one end of which is open to the buffer panel and the other end is open to the top of the finishing mortar layer. Provided is a synthetic floor system for reducing inter-floor noise using an air permeable floor structure for controlling low-frequency resonance, characterized in that it is provided.

According to another preferred embodiment, the present invention provides a composite floor system for reducing inter-floor noise using an air permeable floor structure for controlling low-frequency resonance, characterized in that a dry wall is installed on the top of the first slab to divide the second slab.

According to another preferred embodiment, the present invention provides a synthetic floor system for reducing inter-floor noise using an air permeable floor structure for controlling low-frequency resonance, characterized in that the second slab is divided by a separator.

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

First, it is possible to provide a floor system in which a buffer panel and a finishing mortar layer are sequentially provided on the upper part of the composite slab, and ventilation holes penetrating the finishing mortar layer vertically are provided. Therefore, since the air inside the layer equipped with the buffer panel is discharged to the outside through the ventilation hole, it is possible to reduce inter-floor noise by suppressing the resonance generated by the vibration of the finishing mortar layer being transferred to the concrete floor slab.

Second, by synthesizing a second slab for increasing the slab weight on top of the first slab, which is a structural member that transmits the upper load to the vertical member, the natural frequency band is moved to the lower side to reduce the weight impact sound without increasing the overall thickness of the floor structure. can do.

Third, when a protrusion is formed on the lower surface of the buffer panel, an air layer formed between neighboring protrusions can offset an impact excitation from the upper portion, so that floor impact sound can be more effectively reduced.

1 is a cross-sectional view showing a composite floor system for reducing noise between floors according to the present invention.
Figure 2 is a graph showing the natural frequency of the floor structure and the excitation frequency of the weight impact sound.
Figure 3 is a cross-sectional view showing another embodiment of the composite floor system for reducing noise between floors of the present invention.
4 is an enlarged cross-sectional view showing an embodiment in which upper and lower buffer panels are provided;
5 is a perspective view showing a guide pipe;
Figure 6 is a cross-sectional view showing an embodiment in which a ventilation hole is formed by the guide tube of Figure 5;
Figure 7 is a perspective view showing a buffer panel through-type guide tube.
Fig. 8 is a cross-sectional view showing an embodiment in which a ventilation hole is formed by the guide pipe of Fig. 7;
9 to 11 are perspective views illustrating various embodiments of a guide tube.
Fig. 12 is a cross-sectional view showing an embodiment in which a vent is formed by the guide pipe of Fig. 10;
13 is a photograph showing a composite slab for a weight impact sound experiment according to the presence or absence of cracks.
Fig. 14 is a cross-sectional view showing a divided state of a second slab by drywall;
15 is a graph showing surface moisture content measurement results over time.
Fig. 16 is a perspective view showing a state in which a second slab is divided by a separator;

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

1 is a cross-sectional view showing a synthetic floor system for reducing noise between floors according to the present invention.

As shown in FIG. 1, etc., the synthetic floor system for reducing inter-floor noise using the breathable floor structure for controlling low-frequency resonance of the present invention is for reducing inter-floor noise in an apartment house, and the reinforcing bar 111 is placed inside the first cement composite. A composite slab (1) composed of 1 slab (11) and a second cement composite slab (12) cast on top of the first slab (11); A buffer panel (2) provided on top of the composite slab (1); and a finishing mortar layer (3) provided on the upper portion of the buffer panel (2) and having ventilation holes (H) penetrating vertically. It is characterized by consisting of.

The present invention controls the resonance by suppressing the plate vibration of the floor structure by installing a ventilation hole (H) in which the inside and outside of the floor structure communicate, while increasing the weight of the first slab 11 and the slab that plays a structural role. It is to provide a synthetic floor system for reducing inter-floor noise using an air permeable floor structure for controlling low frequency resonance capable of reducing weight impact noise without increasing the overall thickness of the floor structure by synthesizing the second slab 12 for the floor structure.

The present invention is configured by sequentially stacking a composite slab (1), a buffer panel (2) and a finishing mortar layer (3).

The composite slab 1 is formed by combining the first slab 11 at the bottom and the second slab 12 at the top.

The first slab 11 is a structural member that transmits an upper load to a vertical member such as a wall or a column, and reinforcing bars 111 are reinforced inside the first cement composite.

The first cement composite constituting the first slab 11 can be configured by including cement, fine aggregate, and coarse aggregate as binders, and the first slab 11 itself can exert an effect of reducing weight impact sound to some extent.

The second slab 12 is cast on top of the first slab 11.

The second slab 12 is formed by pouring a second cement composite.

The second slab 12 does not play a structural role, but is intended to improve the impact sound reduction performance of the composite slab 1, and is composed of an unreinforced member without reinforcing bars.

Resonance with excitation waves of weight impact sound can be prevented by moving the natural frequency band of the floor structure to the lower side by the synthesis of the second slab 12 .

In the existing floor structure, a separate floor layer is provided for electrical or facility piping. Unlike this, since the present invention can embed electrical or facility pipes inside the second slab 12, a separate bottom layer for burying pipes can be omitted.

Accordingly, even if the total thickness of the composite slab 1 is formed to be thicker than the thickness of the existing concrete slab, it can be configured so that the overall floor height does not increase.

The lower first slab 11 constituting the composite slab 1 is cast on top of the formwork after installing the formwork. Accordingly, it is not easy to accurately match the smoothness of the upper surface due to deflection of the formwork when placing the first cement composite.

In this case, when the buffer panel 2 is directly installed on top of the first slab 11, a sealed space is formed under the buffer panel 2 due to the sagging of the first slab 11. Therefore, there is a problem in that the modulus of elasticity increases due to the air trapped in the confined space, and thus the floor impact sound increases.

However, since the second slab 12 is formed by pouring the second cement composite on top of the first slab 11, which is already hardened and has high rigidity, there is no concern about sagging during curing of the second cement composite.

Therefore, if the second cement composite is formed of a material having high fluidity, it is possible to adjust the smoothness of the top surface of the composite slab 1 through self-leveling. In addition, when the buffer panel 2 is installed on the upper part of the synthetic slab 1, an increase in floor impact sound can be suppressed by preventing an air layer from occurring under the buffer panel 2.

It is preferable to use a material in the range of 230 to 270 mm in flow value so that the smoothness can be adjusted by self-leveling for the second cement composite.

The first slab 11 may be formed to a thickness of 120 to 210 mm and the second slab 12 may be formed to a thickness of 30 to 120 mm in consideration of the size of the load, the area of the floor structure, and the target for reducing weight impact noise. there is.

A buffer panel 2 is installed on the upper part of the composite slab 1 to reduce floor impact sound and secure thermal insulation performance.

With the second slab 12 formed by pouring the second cement composite of high fluidity on the top of the first slab 11, in a state where the bottom thickness is constant and the top smoothness is matched, the second slab 12 Install the buffer panel (2) on the top. As a result, the buffer panel 2 forms a floating bottom structure with the first slab 11 as a structure.

On the top of the buffer panel 2, a finishing mortar layer 3 is directly constructed without a lightweight foamed concrete layer.

Therefore, the second slab 12 and the finishing mortar layer 3 are provided in duplicate on the lower and upper portions of the buffer panel 2 without the lightweight foamed concrete layer, respectively, so that weight impact noise can be greatly reduced.

In addition, in the past, heating pipes were installed on top of the lightweight foamed concrete layer to improve heating efficiency due to the insulation performance of the lightweight foamed concrete layer. Unlike this, in the present invention, heating efficiency can be secured by the thermal insulation performance of the buffer panel 2 located under the finishing mortar layer 3 instead of the lightweight foamed concrete layer.

In addition, when the electric pipe is embedded and installed inside the second slab 12, the buffer panel 2 blocks heat from the heating pipe to prevent the temperature around the electric pipe from exceeding the allowable temperature.

When the pre-casting base mortar layer is constructed, the base mortar layer preferably has a thickness of 20 to 60 mm, the buffer panel 2 has a thickness of 40 mm or more, and the finishing mortar layer 3 has a thickness of 35 to 60 mm.

Ventilation holes H penetrating vertically are formed in the finishing mortar layer 3 .

The lower part of the ventilation hole (H) is opened to the side of the buffer panel (2), and the upper part is opened to the upper surface side of the finishing mortar layer (3). Accordingly, when held at the top of the floor structure, the air inside the layer provided with the buffer panel 2 escapes to the outside through the ventilation hole (H). Therefore, the vibration of the finishing mortar layer 3 is transmitted to the synthetic slab 1 below, and resonance can be prevented from occurring.

In addition, the impact sound reduction effect is exhibited by increasing the transmission loss by preventing the propagation of the vibration of the finishing mortar layer 3 itself in the horizontal direction at the point that the ventilation hole H itself has.

A plurality of the ventilation holes H may be formed toward the outside of the living room.

[Table 1] below is the measurement result of the inverse A value of floor impact sound by the KS standard measurement method (unit dB).

division bang machine cheek tab no vent formation 48.1 44.7 48.8 vent formation 47.9 43.5 48.5 difference -0.2 -1.2 -0.3

As a result of the measurement by the bang machine, the ball, and the tap, it was confirmed that the floor impact sound was reduced by 0.2dB, 1.2dB, and 0.3dB, respectively, when the ventilation hole (H) was formed.

A finishing panel 4 may be provided on top of the finishing mortar layer 3 .

The finishing panel 4 may be a prefabricated laminated floor that is fitted without a separate adhesive or a steel floor that is attached to the finishing mortar layer 3 using an adhesive.

When the finishing panel 4 is a laminated floor, there is a gap between panels of the laminated floor. Therefore, the air escaping through the ventilation hole (H) is discharged to the outside through the gap between the laminated floor panels.

When the finishing panel 4 is a steel floor, air can be discharged through the valleys by forming valleys in the adhesive itself during adhesive application.

1, 3, etc., between the side end of the buffer panel 2 and the finishing mortar layer 3 and the wall 6, one end is open to the buffer panel 2 side and the other end is closed. A side cushioning material 7 having a side vent 71 open to the top of the mortar layer 3 may be provided.

Recently, in order to prevent floor impact sound from being transmitted through the wall of an apartment house, the Ministry of Land, Infrastructure and Transport Notice No. 2016-824 installed a side buffer (7) between the floor finishing mortar and the wall (6) so that the floor finishing mortar does not directly touch the wall. are required to be built.

A side vent 71 may be formed in the side cushioning material 7 so that air on the side of the buffer panel 2 is discharged even through the bottom end side by using the side cushioning material 7 .

The side vents 71 are formed in the vertical direction inside the side cushioning material 7, and one end, the lower part, is opened toward the buffer panel 2 and communicates with the layer provided with the buffer panel 2, and the other end, the upper part, opens to the buffer panel 2. It is open.

The upper part of the side vent 71 is provided open to the upper part of the finishing mortar layer 3.

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

The second slab 12 may be formed of a cement composite having a unit weight of 2300 kg/m 3 or more.

Since the natural frequency is inversely proportional to the square root of the mass, increasing the mass of the floor structure moves the natural frequency band to a lower side, thereby preventing resonance (resonance) with the excitation wave of the weight impact sound. However, existing concrete slabs are designed to be much thicker than structurally necessary to reduce weight impact noise.

Therefore, the second slab 12 can be configured with high density in order to reduce the weight impact sound by increasing the mass while minimizing the thickness of the composite slab 1 .

Accordingly, the lower first slab 11, which plays a structural role, can be minimized to a thickness that can support the load and prevent sagging, while reducing the weight impact sound. In this case, the thickness of the overall floor structure can be reduced to increase the floor height Savings are also possible.

The second slab 12 does not serve as a structural member supporting a load, but is intended to reduce weight impact noise by increasing the mass of the composite slab 1. Therefore, the second cement composite forming the second slab 12 may be composed of only cement and fine aggregate as binders without coarse aggregate.

The first slab 11 is configured to have a unit weight of 2300 kg / m 3 at the level of general concrete, and the second slab 12 is configured to have a higher density than the first slab 11 with a density of 2300 to 2700 kg / m 3 can do.

When the second slab 12 satisfies the unit volume weight in the numerical range, the natural frequency (f ₀ ) band of the floor structure moves to the lower side, as shown in (a) and (b) of FIG. 2 . Accordingly, it is possible to reduce the generation of inter-floor noise by preventing the occurrence of a resonance phenomenon.

In this case, the difference between the peak point frequency of the natural frequency of the composite slab 1 and the peak point frequency of the excitation frequency of the weight impact sound is within the range of 32 to 125 Hz, and in this range, the effect of reducing noise between floors is large.

[Table 2] below shows the results of weight impact sound reduction by increasing the weight of the second slab.

Weight impact sound was measured when the second slab thickness was 30 mm, 40 mm, and 50 mm based on the first slab thickness of 210 mm.

As a result of the measurement, it can be confirmed that as the thickness of the second slab increases, the weight impact sound reduction effect of 2.1 dB, 2.8 dB, and 3.4 dB, respectively, is exerted.

Hz
existing slab composite slab 2nd slab 30mm
(Weight +80kg/㎡) 2nd slab 40mm
(Weight +100kg/㎡) 2nd slab 50mm
(Weight +130kg/㎡) 63 82.6 80.8 80.3 79.8 125 70.4 67.6 66.7 66.0 250 61.9 59.4 58.7 58.1 500 54.7 53.8 53.1 52.4 inverse A value 55.0 52.9 52.2 51.6 reduction (dB) -2.1 -2.8 -3.4

The finishing mortar layer 3 may be formed by weight mortar having a unit weight of 2300 kg/m 3 or more.

In order to reduce the weight impact sound by increasing the mass of the floor structure, the finishing mortar layer 3 may be configured with a high density.

To this end, weight mortar having a unit weight greater than that of general mortar having a unit weight of 2100 kg/m 3 may be used.

In this case, the unit weight of mortar is 2300 kg/m3 or more, preferably 2600 kg/m3 or less. When the unit weight exceeds 2600 kg/m 3 , the load applied to the structure excessively increases due to the increase in dead weight.

The upper surface of the first slab 11 can be roughened.

In order to maximize the weight impact sound reduction effect, it is preferable to firmly attach the second slab 12 to the first slab 11 so that the first slab 11 and the second slab 12 behave as an integrated member. .

To this end, the upper surface of the first slab 11 may be roughened prior to pouring the second cement composite for forming the second slab 12 .

That is, it is possible to secure strong adhesion between the second slab 12 and the first slab 11 by roughening the upper surface of the first slab 11 .

[Table 3] below compares the weight impact sound reduction effect when the first slab and the second slab are separated and integrated. Here, the thickness of the existing slab and the first slab is 210 mm, and the thickness of the second slab is 150 mm.

Hz
existing slab composite slab Separation of the 1st and 2nd slabs
(2nd slab 50mm) 1st and 2nd slab attached
(2nd slab 50mm) 63 82.6 80.6 79.8 125 70.4 67.1 66.0 250 61.9 58.9 58.1 500 54.7 53 52.4 inverse A value 55.0 52.5 51.6 reduction (dB) -2.5 -3.4

By providing an insulating layer (vinyl) between the first slab 11 and the second slab 12, the first slab 11 is more stable than when the first slab 11 and the second slab 12 are completely separated. When the second slab 12 was attached to the top and constructed, it was found that the weight impact sound was reduced by about 0.9 dB.

The roughening of the upper surface of the first slab 11 may be performed after the first slab 11 is cured. In addition, for workability, it is also possible to roughen the upper surface of the first slab 11 using an appropriate tool before the first slab 11 is completely hardened.

In order to improve the integrity of the first slab 11 and the second slab 12, a primer is applied to the upper surface of the first slab 11, and then a second cement composite is poured to form the second slab 12. You may.

Of course, the first slab 11 and the second slab 12 may be integrated only by applying a primer to the upper surface of the first slab 11 without a separate roughening treatment.

3 is a cross-sectional view showing another embodiment of the composite floor system for reducing noise between floors according to the present invention.

As shown in FIG. 3 , the ventilation holes H may pass through the buffer panel 2 and communicate with each other in the buffer panel 2 and the finishing mortar layer 3 .

When the ventilation hole H is formed to extend to the buffer panel 2, the air of the layer provided with the buffer panel 2 is more easily discharged to the outside when the floor is vibrated, and resonance control performance can be improved.

When the vent hole H extends to the buffer panel 2, the contact area between the vent hole H and the buffer panel 2 is widened, resulting in excellent air discharge efficiency, thereby enhancing the low-frequency resonance control effect.

4 is an enlarged cross-sectional view showing an embodiment in which upper and lower buffer panels are provided.

As shown in FIG. 3, the buffer panel 2 has a plurality of protrusions 21 protruding from the lower portion, so that an air layer 22 is formed between neighboring protrusions 21, and the ventilation hole H is It may be configured to communicate with the air layer 22.

A plurality of protrusions 21 are protruded from the lower surface of the buffer panel 2 so that an air layer 22 is formed between the protrusions 21, so that the shock excitation from the upper part is offset and floor impact sound can be effectively reduced. .

In this case, the ventilation hole H is configured to communicate with the air layer 22 between the protrusions 21 to actively discharge the air of the layer equipped with the buffer panel 2 to the outside, thereby enhancing the low-frequency resonance control effect of the floor structure. can make it

As shown in FIG. 4 , the buffer panel 2 may have a dual structure of a lower buffer panel 2a and an upper buffer panel 2b.

At this time, a plurality of first protrusions 21a may protrude from the lower surface of the lower buffer panel 2a, and a plurality of second protrusions 21b may protrude from the lower surface of the upper buffer panel 2b.

Each of the protrusions 21a and 21b is spaced apart from each other so that a first air layer 22a and a second air layer 22b may be formed between the first protrusions 21a and the second protrusion 21b, respectively.

When the buffer panel 2 is composed of a double structure of upper and lower buffer panels 2a and 2b, the shock excitation from the upper part is offset by the double air layers 22a and 22b formed at the upper and lower parts, thereby making the floor impact sound more efficient. can be reduced

In general, soft cushioning materials such as EPS, which are widely used as buffer panels, have excellent floor impact sound reduction performance as a material itself, but have large deflection and residual deformation under load. Therefore, if the buffer structure is formed only with the soft buffer material, the usability is reduced.

For example, EPS has a density of only 16 kg/m3, which causes large deformation under local load.

On the other hand, the hard cushioning material hardly causes deflection or residual deformation, but has a high dynamic elastic modulus and is not suitable for use as a buffer panel because of its poor floor impact sound reduction performance.

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 configuring the upper and lower buffer panels 2a and 2b stacked vertically by combining a soft buffer material and a hard buffer material, it is possible to reduce floor impact sound transmission and minimize deflection.

That is, the soft cushioning material reduces floor impact sound by the impact sound reduction performance of the soft material itself and the air layer 22 between the protrusions 21 .

In the present invention, by configuring the upper and lower buffer panels 2a and 2b by combining a soft buffer material and a hard buffer material, the thickness of the soft buffer material is reduced compared to the conventional single material buffer material, thereby minimizing problems caused by sagging and residual deformation. In addition, the decrease in impact sound reduction performance due to the decrease in the thickness of the soft shock absorber can be compensated by the air layer 22 under the hard shock absorber to exhibit sufficient impact sound reduction performance as a whole.

At this time, when 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 lower soft cushioning material by pressing the protruding part 21 of the hard buffering material. Accordingly, the protrusions 21 of the hard cushioning material are buried in the soft buffering material so that a sufficient air layer 22 is not formed.

Accordingly, the lower buffer panel 2a may be formed of a hard buffer material and the upper buffer panel 2b may be formed of a soft buffer material. Accordingly, it is possible to reduce floor impact noise by sufficiently securing the first air layer 22a and the second air layer 22b while minimizing deformation of the buffer structure.

The lower buffer panel 2a may be made of EVA. EVA has a density of 50 kg/m3, and the structure of the material is dense, so even if a large load is applied compared to the ground area, the repulsive force and bearing capacity are high.

The upper buffer panel 2b may be made 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.

As a result, it is possible to first reduce the vibration in the upper buffer panel 2b against the upper impact, and minimize the vibration transmitted to the lower part by the second protrusion 21b of the upper buffer panel 2b.

5 is a perspective view showing a guide tube, and FIG. 6 is a cross-sectional view showing an embodiment in which a vent is formed by the guide tube of FIG. 5 .

As shown in FIGS. 5 and 6 , the ventilation hole H may be formed by a guide pipe 5 buried inside the finishing mortar layer 3 .

The ventilation hole (H) may be formed by perforating the finishing mortar layer (3). However, in this case, it is difficult to determine the position of the lower pipe, and there is a risk of damage to the pipe when the finishing mortar layer 3 is perforated.

Therefore, on a new floor, it is preferable to form a ventilation hole (H) together when the finishing mortar layer (3) is poured. At this time, the ventilation hole (H) can be formed by the guide pipe (5) serving as a formwork.

The guide pipe 5 can be made of PVC, paper pipe, etc., and can be formed in a cross section such as a circular shape or a prismatic shape with open top and bottom.

In order to prevent the upper end of the guide pipe 5 from being completely buried inside the finishing mortar layer 3 when the finishing mortar is poured, to prevent the hole from being clogged, the guide pipe 5 is higher than the upper surface of the finishing mortar layer 3 by a predetermined height. can form

The portion of the guide pipe 5 protruding above the upper surface of the finishing mortar layer 3 can be cut on site after completion of the finishing mortar layer 3 construction.

A flange 51 may be formed at a lower end of the guide tube 5 to stably mount the guide tube 5 on the upper portion of the installation surface.

7 is a perspective view showing a buffer panel through-type guide tube, and FIG. 8 is a cross-sectional view showing an embodiment in which a ventilation hole is formed by the guide tube of FIG. 7 .

As shown in FIGS. 7 and 8 , the lower end of the guide pipe 5 is configured to pass through the buffer panel 2, and a plurality of holes open toward the buffer panel 2 are formed on the lower outer circumferential surface of the guide pipe 5. A ventilation hole 52 may be formed therethrough.

In the case of extending the ventilation hole H through the buffer panel 2, the guide tube 5 may be installed through the buffer panel 2.

At this time, a plurality of ventilation holes opened toward the buffer panel 2 on the outer circumferential surface of the guide tube 5 so that the air inside the air layer 22 between the inside of the buffer panel 2 or the adjacent protrusions 21 can be discharged. (52) can be formed.

In this case, the ventilation holes 52 may be provided only on the side of the buffer panel 2 to prevent mortar from flowing into the guide pipe 5 when the finishing mortar layer 3 is placed.

9 to 11 are perspective views illustrating various embodiments of a guide pipe, and FIG. 12 is a cross-sectional view illustrating an embodiment in which a vent is formed by the guide pipe of FIG. 10 .

As shown in FIGS. 9 to 12 , the lower portion of the guide pipe 5 may be configured such that the diameter becomes narrower toward the lower portion.

The guide tube 5 may be fixed by inserting a perforated hole in the buffer panel 2 in advance. However, in this case, it is cumbersome to construct the shock absorbing panel 2 separately because it is necessary to perforate the guide pipe 6 in order to fix it.

Therefore, if the lower part of the guide pipe 5 is formed narrowly, the position of the guide pipe 5 is simplified by installing the buffer panel 2 first and then inserting the lower part of the guide pipe 5 into the upper part of the buffer panel 2. can be fixed.

As shown in FIGS. 9 and 10 , the guide pipe 5 may be formed in an inverted cone shape or an inverted truncated cone shape. Alternatively, as shown in FIG. 11, it is also possible to configure the guide tube 5 by cutting the cylinder obliquely.

The guide pipe 5 of the form shown in FIG. 11 may also form a plurality of ventilation holes 52 on the cut lower surface.

13 is a photograph showing a synthetic slab for weight impact sound experiments according to the presence or absence of cracks, FIG. 14 is a cross-sectional view showing a divided state of a second slab by drywall, and FIG. 15 is a surface moisture content measurement result over time. It is a graph that represents

As shown in FIG. 14 , a dry wall 8 is installed above the first slab 11 to divide the second slab 12 .

When a crack occurs in the second slab 12, the weight impact sound tends to increase.

In addition, when a crack occurs in the second slab 12, the integrity of the first slab 11 and the second slab 12 is deteriorated, which adversely affects the weight impact sound.

As a result of comparing the weight impact sound between the case where the second slab 12 actually has a crack (FIG. 13(a)) and the case where there is no crack (FIG. 13(b)), the crack in the second slab 12 It was confirmed that the weight impact sound was reduced by 2.5 dB in the absence.

Therefore, it is desirable to minimize the occurrence of cracks in the second slab 12 in order to reduce weight impact noise.

To this end, as shown in FIG. 14 , the second slab 12 may be divided in plan by using the drywall 8 installed on the upper part of the floor structure.

Since the length of the second slab 12 is divided by the drywall 8 and the length is shortened, the amount of shrinkage for each section of the second slab 12 is reduced (the shrinkage rate is the same) to reduce cracking and the first slab 11 It is possible to further secure the adhesion performance with the

The second cement composite constituting the second slab 12 may be configured to include heavy fine aggregate and cement.

The second slab 12 does not serve as a structural member, but is intended to reduce weight impact noise by increasing the weight of the slab, and is configured by mixing only fine aggregates of 5 mm or less without coarse aggregates to enable self-leveling through securing fluidity. can do.

The fine weight aggregate may use an aggregate having a density of 2.9 to 4.0 g/cm 3 among KS-certified aggregates.

The weighted fine aggregate allows the mortar layer to be weighted within the above numerical range to effectively reduce the weight impact sound while exhibiting appropriate strength. In addition, the weight fine aggregate has a high modulus of elasticity and reduces the amount of shrinkage.

The heavy fine aggregate is wind mill 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), soft slag (about 3.5 g / cm 3), ferro At least one of nickel slag (about 3.1 g/cm 3 ) and blast furnace slag (about 2.9 g/cm 3 ) may be included.

When constructing the second slab with the second cement composite, the modulus of elasticity is 9.4E+03MPa when the general fine aggregate is used, but the modulus of elasticity increases by 23% to 1.2E+04MPa when the heavy fine aggregate is used.

Accordingly, the amount of crack generation was measured as 62.9mm/m2 when using normal fine aggregate, while it was measured at 14.9mm/m2 when using heavy fine aggregate, resulting in a crack reduction effect of 76%.

In addition, it takes a long time for the moisture inside the member to dry when using heavy fine aggregate, which has a dense structure due to its high density.

Accordingly, as can be seen in the graph showing the surface moisture content measurement result of FIG. 15, when using the heavy fine aggregate (High Density), the internal humidity of the second cement composite can be slowly reduced, and the internal curing is induced to cause shrinkage. and cracking can be reduced.

As a cement as a binder, one type of ordinary Portland cement or the like can be used, and it is preferable that the fineness is 3500 ± 100 cm 2 / g.

16 is a perspective view showing a state in which the second slab is divided by a separator.

As shown in FIG. 16, the second slab 12 may be divided by a separator 9.

In order to reduce cracking of the second slab 12, the second slab 12 can be divided into appropriate areas by arranging a plurality of separators 9 on the top of the first slab 11 in the longitudinal and/or transverse directions. can

The separator 9 is formed at the same height as the height of the second slab 12, and preferably has a width of about 70 to 200 mm.

When a material having a buffering effect such as PE is used as the separator 9, the maximum sound pressure level due to the centralized impact load can be reduced by dispersing the floor impact load.

1: composite slab 11: first slab
111: rebar 12: second slab
2: buffer panel 2a: lower buffer panel
2b: upper buffer panel 21: protrusion
21a: first projection 21b: second projection
22: air layer 22a: first air layer
22b: second air layer 3: finishing mortar layer
4: finishing panel 5: guide pipe
51: flange 52: vent hole
6: wall 7: side buffer
71: side vent 8: drywall
9: separator H: vent

Claims (12)

It is intended to reduce noise between floors of apartment houses,
A composite slab composed of a first slab 11 in which reinforcing bars 111 are reinforced inside the first cement composite and a second slab 12 that is unreinforced and cast on top of the first slab 11 as a second cement composite (One);
A buffer panel (2) provided on top of the composite slab (1); and
A finishing mortar layer (3) provided on the top of the buffer panel (2) and having ventilation holes (H) penetrating vertically; A synthetic floor system for reducing inter-floor noise using a breathable floor structure for controlling low-frequency resonance, characterized in that composed of.
In paragraph 1,
The second slab 12 is a composite floor system for reducing noise between floors using a breathable floor structure for controlling low-frequency resonance, characterized in that it is formed by a weight cement composite having a unit weight of 2300 kg / m 3 or more.
In paragraph 1,
The finishing mortar layer (3) is a synthetic floor system for reducing noise between floors using a breathable floor structure for controlling low-frequency resonance, characterized in that it is formed by weight mortar having a unit weight of 2300 kg / m or more.
In paragraph 1,
A synthetic floor system for reducing noise between floors using a breathable floor structure for controlling low-frequency resonance, characterized in that the upper surface of the first slab (11) is roughened.
In paragraph 1,
The ventilation hole (H) penetrates the buffer panel (2) and is formed in communication with each other in the buffer panel (2) and the finishing mortar layer (3), characterized in that the synthetic floor for reducing noise between floors using a breathable floor structure for controlling low frequency resonance system.
In paragraph 5,
The buffer panel 2 has a plurality of protrusions 21 protruding from the lower portion, so that an air layer 22 is formed between neighboring protrusions 21, and the vent hole H communicates with the air layer 22. A synthetic floor system for reducing inter-floor noise using a breathable floor structure for controlling low-frequency resonance.
In paragraph 5,
The ventilation hole (H) is a synthetic floor system for reducing noise between floors using a breathable floor structure for controlling low-frequency resonance, characterized in that formed by a guide pipe (5) buried inside the finishing mortar layer (3).
In paragraph 7,
The lower end of the guide tube 5 is configured to pass through the buffer panel 2, and a plurality of ventilation holes 52 open to the buffer panel 2 are formed through the outer circumferential surface of the lower portion of the guide tube 5 A synthetic floor system for reducing inter-floor noise using a breathable floor structure for controlling low-frequency resonance.
In paragraph 8,
A synthetic floor system for reducing inter-floor noise using a breathable floor structure for controlling low-frequency resonance, characterized in that the lower part of the guide tube (5) is configured to have a narrower diameter toward the lower part.
In paragraph 1,
Between the side end of the buffer panel (2) and the finishing mortar layer (3) and the wall (6), one end is open to the side of the buffer panel (2) and the other end is open to the top of the finishing mortar layer (3). A synthetic floor system for reducing inter-floor noise using a breathable floor structure for controlling low-frequency resonance, characterized in that the side cushioning material (7) having a ventilation hole (71) is provided.
In paragraph 1,
A synthetic floor system for reducing noise between floors using an air permeable floor structure for controlling low frequency resonance, characterized in that a dry wall (8) is installed on the upper part of the first slab (11) to divide the second slab (12).
In paragraph 1,
The second slab (12) is a synthetic floor system for reducing inter-floor noise using a breathable floor structure for controlling low-frequency resonance, characterized in that divided by a separator (9).

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