JP2005325575A - Floor impulsive sound improving construction method and its floor structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To propose an effective floor impulsive sound improving construction method and its floor structure, superior in economic efficiency for constructing the floor structure for reducing a floor impulsive sound after constructing a floor slab of a building. <P>SOLUTION: This floor structure 1 has the floor slab 10 installed between an upper floor room 2 and a lower floor room 3 and a static load member 30 for applying a static load to a position being the antinode of vibration of the floor slab 10; and is constructed by the floor impulsive sound improving construction method for effectively reducing a floor impulsive sound by arranging the static load member 30 by grasping a vibration characteristic of the floor slab 10 after constructing the floor slab 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a floor impact sound improving method for reducing floor impact sound and the floor structure of the floor structure of a building.

  The floor impact sound is one of the most common causes of troubles associated with life in apartment houses such as apartments. The floor impact sound is caused by walking, jumping, dragging furniture, dropping tableware, etc., and vibration of a wide frequency component due to impact occurs depending on the softness and impact time of the object that is impacted. This is the sound that propagates and is observed in the lower floor room.

  Conventionally, for the purpose of reducing floor impact sound, a method of increasing the thickness of the floor slab or a method of reducing the slab area by adding a beam has been employed. However, the method of increasing the thickness of the floor slab has a problem that it is uneconomical because a slab thickness much larger than the structurally required slab thickness is required. In recent years, since there is a high degree of freedom in space design, buildings with little or no small beams are required, and there is a tendency that it is difficult to adopt a method of reducing the slab area by adding beams.

  For this reason, in Patent Document 1, a porous plate is provided below the joists, and a floor base plate is provided above the joists to form a hollow portion, and a sound absorbing material is provided in the hollow portion. A floor structure is disclosed in which a floor finishing plate is disposed via a vibration sheet. With this configuration, the impact sound generated on the floor surface is reduced by the sound absorbing material disposed in the hollow portion, and the vibration is caused by the vibration damping sheet and the floor portion by the flash structure in which the floor base plate, joist and perforated plates are stacked one above the other. It is reduced by making it rigid.

Further, in Patent Document 2, a floor structure in which a support leg is provided between a floor slab and a floor base to constitute a hollow portion having a predetermined height is provided with a hollow portion standing on the floor base at a predetermined interval. A partition structure is disclosed in which a spacer is provided at the lower end of the partition wall to communicate adjacent hollow portions. As a result, since the air layer is conventionally confined in the narrow hollow portion by the partition wall, the impact sound of the upper floor chamber that has been amplified in the hollow portion and propagated to the lower floor chamber is transferred to the adjacent hollow portion and the spacer. It became possible to create and reduce the escape space of the air layer by communicating through the air.
JP 2001-132151 A ([0011]-[0017], FIG. 1) JP 2001-288836 A ([0006]-[0022], FIG. 1)

  Here, the floor impact sound of a building is a sound that is observed in the lower floor room due to the vibration of a wide frequency component generated by the impact on the floor. The natural frequency of several propagation systems is When approaching, the influence of this frequency becomes large in the entire propagation system, resulting in a large floor impact sound. And these floor impact sound propagation systems are composed of floor finishing material, floor slab, ceiling finishing material, lower floor room space, etc., each of these propagation systems has individual response characteristics, There are many natural frequencies that show peaks in their response characteristics.

  Therefore, the mechanism of floor impact sound in a building is grasped after all propagation systems have been established, and in order to construct the most effective floor impact sound insulation reduction structure, it is necessary to perform it after construction of the propagation system. is there. Therefore, as described above, in the floor structure that is constructed at the time of building construction, it is necessary to change the finish of the floor and ceiling in order to improve the performance, or the sound insulation structure is assumed in advance assuming all possibilities. Since it may become an excessive structure by constructing, it has a problem that it takes time and is uneconomical.

  The present invention aims to solve the above-mentioned problems, and is an effective and economical floor impact that constructs a floor structure that reduces floor impact noise after construction of a floor slab of a building. The problem is to propose a sound improvement method and its floor structure.

  In order to solve such a problem, the invention according to claim 1 is directed to adjusting the natural frequency of the floor slab by applying a static load to the floor slab after the construction of the floor slab of the building. This is a floor impact sound improvement method characterized by reducing the impact sound.

  This floor impact sound improvement method is to change the response characteristics of the floor slab by applying a static load to the floor slab after confirming the floor impact sound cutoff performance and slab vibration transmission characteristics after building the floor slab, This makes it possible to reduce floor impact noise.

The invention according to claim 2 is the floor impact sound improving method according to claim 1, characterized in that the static load is applied to a position which becomes an antinode of vibration of the floor slab. .
As a result, the natural frequency of the floor slab can be shifted from the natural frequency of another propagation system, and the floor vibration sound can be prevented from being amplified.

  Here, the floor impact sound observed in the lower floor room has a frequency with large unevenness due to the response characteristics of the propagation system with respect to the frequency component of the generated vibration. For this reason, the magnitude of the floor impact sound in the lower floor room is determined by the vibration at the frequency showing the peak. Therefore, the present invention changes the response characteristic of the propagation system by adding a static load to the floor slab after the propagation system of the building is determined and the response characteristic of the floor impact sound is grasped. This is a floor impact sound improvement method that can effectively reduce floor impact noise by shifting the frequency peak between adjacent propagation systems.

  According to a third aspect of the present invention, there is provided a floor slab constructed between the upper floor room and the lower floor room, and a static loading member that loads a static load at a position that becomes an antinode of vibration of the floor slab. The static load member is disposed after the construction of the floor slab to adjust the natural frequency of the floor slab.

  Such a floor structure has a configuration in which a concentrated load is loaded at a place where the vibration is caused at the natural frequency of the floor slab, so that the response characteristics of the floor slab can be changed and the floor impact sound can be reduced. Yes. In addition, since the place that becomes the antinode of the vibration of the floor slab where the static loading member is arranged is determined after confirmation after the construction of the floor slab, it is necessary to construct an effective floor structure for reducing floor impact noise. Is possible.

  The invention according to claim 4 is the floor structure according to claim 3, wherein the static load member is a weight member having a predetermined weight.

  Such a floor structure is effective in reducing floor impact noise simply by arranging a weight material having a predetermined weight on the floor slab using the space between the floor finishing material and the floor slab in the dry double floor. It is preferable because a typical floor structure can be constructed. Here, the dry double floor is a construction method in which a floor finishing material is disposed above a floor slab through a predetermined space.

  Further, the invention according to claim 5 is the floor structure according to claim 3, wherein the static load member is a tension string member installed along the floor slab, and a center of the floor slab and the tension string member. A bundle column having a height longer than the separation distance from the section, and the bundle column has one end of the bundle column abutting against the floor slab and the other end of the string member. It is characterized by being arranged so as to contact the central portion.

Such a floor structure is formed by disposing a bundle column having a height longer than the separation distance between the floor slab and the string material between the string material fixed along the floor slab and the floor slab. A static load is applied to the position where the vibration of the floor slab becomes antinode via the bundle column by the restoring force. Thereby, the natural frequency of the floor slab can be shifted. That is, the bundle pillar has a height for pushing out the string material installed along the floor slab in the direction opposite to the floor slab. Therefore, when a bundle column is installed, a static load is loaded on the floor slab via the bundle column by the tension generated when the string material is pushed in the opposite direction to the floor slab.
Here, the “stringed material installed along the floor slab” is not limited to a linear material in which the stringed material is disposed in parallel with the floor slab, but may be a curved material. Moreover, you may use what consists of a flexible material as a string material.
In the present specification, the “separation distance” indicates the distance between the floor slab and the string material before the bundle pillar is installed.

  With the floor impact sound improving method and the floor structure of the present invention, it is possible to construct a floor structure that reduces the floor impact sound that is effective and economical.

  Preferred embodiments of the present invention will be described with reference to the drawings. In the description, the same reference numerals are used for the same elements, and duplicate descriptions are omitted.

[First Embodiment]
FIG. 1 is a cross-sectional view showing a floor structure 1 according to a floor impact sound improving method according to a first embodiment (hereinafter may be referred to as “first embodiment”). Reference numeral 10 denotes a floor slab, reference numeral 20. Is a floor finishing material, and reference numeral 30 is a weight material which is a static loading member. FIGS. 2A and 2B are explanatory views of vibration antinodes. FIG. 2A shows a primary vibration, and FIG. 2B shows a secondary vibration. FIG. 3 is a schematic diagram showing the effect of reducing floor impact sound by the floor impact sound improving method of the present invention, wherein (a) is a normal floor structure, and (b) is the floor impact sound improvement of the present invention. It is a floor structure constructed by a construction method.

  The floor structure 1 of the first embodiment is a dry double floor, and a floor finishing material 20 is disposed on a floor slab 10 made of reinforced concrete via support legs 24 disposed at a predetermined pitch. Thus, a predetermined space 4 is formed between the floor slab 10 and the floor finishing material 20. Here, the shape and material of the support leg 24 are not limited, and a known support leg may be used.

  The floor finishing material 20 includes a floor panel 21 made of gypsum board or the like laid on the support legs 24 and a finishing material 22 such as a flooring material laid on the floor panel 21. Further, the floor finish 20 has an opening 23 at a predetermined location, and communicates the upper floor room 2 and the space 4. The opening 23 is provided with a door (not shown) that can be opened and closed.

  A weight member 30 made of a steel plate is disposed on the upper surface of the floor slab 10 near the opening 23, and the steel plate 30 is fixed by an adhesive so as not to move due to an earthquake or the like. .

  The static load is applied to the floor structure 1 according to the first embodiment after the construction of the floor slab 10 and the floor finishing material 20 is completed, and the natural frequency of the floor slab 10 is set to the characteristic of the floor finishing material 20 and the lower floor chamber 3. This is performed at a position where the vibration of the floor slab 10 becomes an antinode, away from the frequency.

When an impact is applied to the floor slab 10, as shown in FIG. 2 (a), since its end is fixed to the beam 11, the vibration 10 a of the floor slab is greatly shaken at the center, It becomes a belly of vibration. Therefore, if the weight member 30 is arranged at the portion that becomes the antinode of the vibration, the vibration 10a of the floor slab is shaken most at the intermediate portion between the weight member 30 and the beam 11, as shown in FIG. Since it becomes a vibration antinode, the response characteristic of the floor slab 10 is changed.
In addition, if necessary, the weight member 30 is further arranged in the middle portion of the vibration between the beam 11 and the weight member 30 to adjust the natural frequency of the other propagation system. Also good.
In addition, a primary vibration whose center is a vibration antinode like the vibration 10a of the floor slab shown in FIG. 2 (a) is not close to the natural frequency of other propagation systems, but the floor slab shown in FIG. 2 (b). If the vibration frequency is close to the natural frequency of another propagation system in the case of the secondary vibration or higher, such as the vibration 10a, the weight material 30 is arranged in advance at the position where the vibration is caused to change the response characteristic. May be.

Here, the natural frequency of the floor slab 10 or the floor finishing material 20 is obtained by installing a vibration sensor on the floor slab 10 or the floor finishing material 20, performing shock excitation with a hammer or the like, and measuring the response. Can do. The natural frequency of the space in the lower floor room 3 can be obtained by installing a speaker in the room, emitting broadband noise or impulse, and measuring the response with a microphone. In addition, the position which becomes the antinode of the vibration in the natural frequency of the floor slab 10 may be obtained by assembling a vibration model of the floor slab 10 and calculating it by numerical analysis.
Then, it is most effective to load the floor slab 10 in a concentrated manner at a place where vibration occurs at the natural frequency of the floor slab 10, and a static loading member so that the force is not dispersed. The one where the installation area of 30 and the floor slab 10 is small is preferable.

  The static load is applied to the floor finish 20 in advance by forming an opening 23 in the vicinity of a position expected to become a vibration antinode of the floor slab 10. What is necessary is just to arrange | position the weight material 30 which is a static loading member.

  Therefore, the floor structure 1 constructed by the floor impact sound improvement method according to the first embodiment grasps the intrinsic response characteristics of each propagation system, and then statically loads the floor slab 10 at a position where it becomes an antinode of vibration. Since the member 30 is disposed, the natural frequency of the floor slab 10 can be separated from the natural frequency of other propagation systems that are close to the floor slab 10, such as the floor finishing material 20 and the space of the lower floor room 3. It becomes possible, and it becomes possible to reduce the floor impact sound transmitted to the lower floor room 3 reliably. Moreover, since the said floor structure 1 is comprised by applying a required minimum static load to the position effective for reduction of a floor impact sound, it is excellent in economical efficiency. Furthermore, since the floor impact sound improvement method measures the response characteristics of each propagation system and then improves the floor impact sound, the floor impact sound can be reliably reduced. No need for repair work.

  Hereinafter, with reference to FIG. 3, the effect of the floor structure 1 constructed | assembled by the floor impact sound improvement construction method of this invention is demonstrated. Here, FIGS. 3A and 3B show the response characteristics of the floor slab, the space of the lower floor room, the sum of the floor slab and the space of the lower floor room, with the horizontal axis representing frequency and the vertical axis representing response characteristics. And the frequency.

FIG. 3A shows the floor slab response characteristic f1 peak (natural frequency) P1 and the floor response characteristic f2 peak (natural frequency) P2 of the lower floor room in the vicinity of the floor slab. FIG. 3B is a graph showing the response characteristic f1, the response characteristic f2 of the lower floor room, and the response characteristic ft in which both are combined. FIG. 3B shows the response characteristic f1 of the floor slab by the floor impact sound improving method of the present invention. The response characteristic ft of the floor slab and the response characteristic f2 of the lower floor room when the peak P1 and the peak response P2 of the response characteristic f2 of the lower floor room are not close to each other are shown. It is a graph.
As shown in FIG. 3A, when the peak P1 of the response characteristic f1 of the floor slab and the peak P2 of the response characteristic f2 of the lower floor space are close to each other, the peak Pt of the response characteristic combining them However, as shown in FIG. 3B, in the floor structure configured so that the peak P1 of the response characteristic f1 of the floor slab and the peak P2 of the response characteristic f2 of the space in the lower floor room are not close to each other, The combined response characteristics peaks Pt1 and Pt2 are smaller than the peak Pt shown in FIG. Therefore, it is possible to reduce floor impact sound by loading a static load on the floor slab and shifting the natural frequency from the natural frequency of other propagation systems.

[Second Embodiment]
FIG. 4A is a cross-sectional view showing a floor structure 1 ′ according to a floor impact sound improving method according to a second embodiment (hereinafter also referred to as “second embodiment”). A static load P is applied from below by a static loading member 30 '.

  In the floor structure 1 ′ of the second embodiment, when the ceiling finishing material 25 is installed in the lower floor room 3, static loading is performed in the space 4 ′ formed between the ceiling finishing material 25 and the floor slab 10. It is the structure which installs member 30 '.

The static loading member 30 ′ is composed of a string member 31 and a bundle column 32, and the upper end of the bundle column 32 made of a columnar member is brought into contact with a position that becomes an antinode of steady vibration of the floor slab 10, The central portion of the string member 31 is in contact with the lower end of the bundle pillar 32.
In the second embodiment, both ends of the string material 31 are fixed to the side surface of the beam 11 around the floor slab 10 ′. The string member 31 has substantially the same length as the distance between the beams 11 and 11 and is horizontal while being fixed to the beams 11 and 11. Moreover, since the height of the bundle pillar 32 is longer than the separation distance d from the lower end of the floor slab 10 to the string material 31, when the bundle pillar 32 is installed at a predetermined position, the string material 31 faces downward and the reaction force A static load P in the vertical direction is applied to the floor slab 10. Moreover, the material and shape which comprise the string material 31 and the bundle pillar 32 are not limited, What is necessary is just to set suitably. Further, the string material 31 is not limited to the beam 11 but may be fixed to the end of the floor slab 10 or the like.

  In addition, it is desirable that the fixed portion of the string material 31 is located away from the position of the vibration antinode of the floor slab 10. In addition, when it is planned to apply the static load P to the floor slab 10 by the string material 31 in advance, the string material 31 can be installed by installing a sheath tube of the string material 31 on the floor slab 10 or the beam 11 in advance. It is easy and suitable. The static load P applied to the floor slab 10 can be adjusted by adjusting the length of the string member 31 or the height of the bundle pillar 32. Moreover, if the opening part 26 is formed in the ceiling finishing material 25, it will become easy to adjust the dimension of the string material 31 and the bundle pillar 32, and it is suitable.

Here, the measurement method of the natural frequency of the propagation system such as the floor slab 10 and the position of the antinode of the vibration of the floor slab 10 is the same as the method described in the first embodiment, and thus detailed description is omitted.
Moreover, since the effect by the floor structure 1 'of 2nd Embodiment is the same as the effect described in 1st Embodiment, detailed description is abbreviate | omitted.

  FIG. 4B is a cross-sectional view showing a configuration in which a static load P is loaded from above the floor slab as a modification of the floor structure 1 ′ using the string material 31 and the bundle pillars 32 of the second embodiment. is there. In the figure, a floor structure 1 ″ in which a static loading member 30 ′ composed of a string member 31 and a bundle pillar 32 is disposed in a space 4 formed between a floor slab 10 and a floor finishing material 20 of a dry double floor. In addition, since the effect, installation method, etc. of the floor structure 1 ″ are the same as the contents described in the first embodiment and the second embodiment, detailed description is omitted, but the string material 31 Both ends are fixed to the upper surface of the floor slab 10.

  As mentioned above, although the example of suitable embodiment was demonstrated about this invention, this invention is not limited to the said embodiment, A design change is possible suitably in the range which does not deviate from the meaning of this invention.

For example, in each of the embodiments described above, the floor slab is made of reinforced concrete, but it goes without saying that the material forming the floor slab is not limited.
In addition, the configuration for applying a static load to the floor slab is not limited to the configuration described in each of the above embodiments. For example, the partition of the lower floor room is located at a position where the floor slab vibrates. A static load may be applied to the floor slab by installing a wall. In this case, the partition wall needs to have a support member having a strength and a mechanism capable of performing vibration control of the floor slab in advance. In addition, the static loading on the floor slab is performed by adjusting the length of the support member.

In the first embodiment, the steel plate is fixed with an adhesive, but the present invention is not limited to this. For example, the steel plate may be screwed with a bolt or the like.
Moreover, although an iron plate is used as the weight member of the first embodiment, the present invention is not limited to this, and for example, an iron ball may be used.

In addition, as the static loading member of the second embodiment, a combination of a string material and a bundle column is used, but a protrusion is formed in the vicinity of the center of the string material in advance, and the floor slab is formed by this protrusion. What adds a static load to the predetermined position may be used, and the configuration may be set as appropriate.
In addition, the shape, material, configuration, etc. of the bundle pillar are not limited to those shown in the figure. For example, by using a member having an expansion / contraction function or a spring-like member as the bundle pillar, The static load applied to the floor slab may be adjusted.

It is sectional drawing which shows the floor structure by the floor impact sound improvement construction method of 1st Embodiment. It is explanatory drawing of the antinode of vibration, (a) shows at the time of primary vibration, (b) shows at the time of secondary vibration. It is a graph which shows the result of having conducted the verification experiment of reduction of the floor impact sound by the floor impact sound improvement construction method of this invention, (a) is normal floor structure, (b) is the floor impact sound improvement construction method of this invention. It is a constructed floor structure. It is sectional drawing which shows the floor structure by the floor impact sound improvement construction method of 2nd Embodiment, (a) shows the state by which the static load is added to the floor slab from the bottom, (b) is the modification. Is shown.

Explanation of symbols

1 Floor structure 2 Upper floor room 3 Lower floor room 10 Floor slab 30 Weight material (static loading member)
31 String chord 32 Bunch pillar

Claims (5)

  A method for improving floor impact sound, wherein after a building floor slab is constructed, a static load is applied to the floor slab to adjust the natural frequency of the floor slab to reduce floor impact sound.   The floor impact sound improving method according to claim 1, wherein the static load is applied to a position that becomes an antinode of vibration of the floor slab. A floor structure having a floor slab constructed between an upper floor room and a lower floor room, and a static loading member that loads a static load at a position that becomes an antinode of vibration of the floor slab,
The floor structure characterized in that the static loading member is disposed after the construction of the floor slab to adjust the natural frequency of the floor slab.   The floor structure according to claim 3, wherein the static loading member is a weight member having a predetermined weight. The static loading member is composed of a string member installed along the floor slab, and a bundle column having a height longer than a separation distance between the floor slab and a central portion of the string member,
The bundled column is arranged so that one end of the bundled column contacts the floor slab and the other end contacts the central portion of the string member. The floor structure described.

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