JP4405416B2 - Reduction method of heavy floor impact sound of existing floor slab - Google Patents

Description

  The present invention is intended for existing floor slabs, and belongs to the technical field of a method for effectively reducing heavy floor impact sound as well as light floor impact sound propagating to lower floor dwelling units.

  One of the important living performances of an apartment house is to prevent heavy floor impact noise of the floor slab. The heavy floor impact sound of a floor slab is a phenomenon in which an adult's barefoot walking or a child's running around the floor slab propagates to the floor slab and radiates to the lower floor dwelling unit, resulting in noise.

  Since the floor slab itself vibrates to form a sounding body, the floor floor slab is generally known to produce less sound as the floor slab is thicker and has greater mass or rigidity. ing. In recent years, the social demand for the living environment has increased, and there are many cases where the slab thickness is designed to be as thick as 200 to 300 mm.

  However, the technology of simply designing and constructing the slab thickness increases the slab weight and increases the seismic load, which increases the structural design burden. In addition, this technique is often not applicable because, for example, there is a limitation in the change of the structural frame when it is applied to a so-called existing floor slab, such as conversion from an office to a housing complex or renovation of an existing building.

  Conventionally, various techniques for reducing a heavy floor impact sound of a floor slab have been disclosed (see, for example, Patent Documents 1 to 6). However, all of the techniques according to Patent Documents 1 to 5 are techniques for new floor slabs and cannot be applied to existing floor slabs as they are. The techniques according to Patent Documents 1 to 3 are intended for lightweight structures such as wooden structures (for example, Patent Document 1) and lightweight steel structures (for example, Patent Documents 2 and 3). Is difficult to apply.

  The technology according to Patent Document 6 is a technology for existing floor slabs, and is composed of a new floor portion laid with a gap above the existing floor slab and a new support portion that supports the new floor portion. A double floor structure for refurbishment, in which the new support portion is disposed on the upper surface of an existing beam, and vibration due to a floor impact on the upper floor from the new floor portion through the new support portion is disclosed. Because the vibration is transmitted to the existing beam and transmitted from the existing beam to the existing floor slab, vibration is not transmitted directly to the existing floor slab, and the vibration transmitted to the existing floor slab is reduced. Heavy floor impact sound is reduced.

Japanese Patent Laid-Open No. 9-4202 Japanese Patent Laid-Open No. 10-30298 Japanese Patent Laid-Open No. 11-117515 JP 2002-81198 A Japanese Patent Laid-Open No. 2004-211289 JP 2004-308204 A

  Although the technique according to Patent Document 6 described above can reduce vibration transmitted to the existing floor slab and reduce the heavy floor impact sound of the newly formed floor, it does not stiffen the existing floor slab itself. Therefore, the reduction effect is considered to be low. Therefore, it can be said that there is room for improvement.

  The purpose of the present invention is to increase the surface density (weight) of the existing floor slab as well as to reduce the lightweight floor impact sound transmitted to the lower floor dwelling by providing a dry double floor on the upper surface of the existing floor slab. It is an object of the present invention to provide a method for effectively reducing heavy-weight floor impact sound by making the rigidity as small as possible and improving the rigidity efficiently.

As a means for solving the above-mentioned problem, a method for reducing a heavy floor impact sound of an existing floor slab according to the invention described in claim 1 is:
At intervals to short side direction on the lower surface of the existing floor slab, surrounded by the beams, the upper surface of the reinforcing member such as a plurality of H-beams to stiffen the same existing floor slab, adhesive and / or bolted means And both ends of the reinforcing member are fixed to a beam or a column surrounding the existing floor slab, and support legs for supporting the dry double floor are provided on the upper surface of the existing floor slab. It is installed in a straight upper location of the member, characterized in that to improve the impedance of the floor slab.

The invention described in claim 2 is the method for reducing the heavy floor impact sound of the existing floor slab described in claim 1,
The reinforcing member 2 fixed to the lower surface of the existing floor slab 1 is characterized in that the lower surface of the existing floor slab 1 becomes a compression region and the reinforcing member 2 is fixed in a state where the entire cross section is pulled.

The invention described in claim 3 is the method for reducing the heavy floor impact sound of the existing floor slab described in claim 1 or 2,
The reinforcing member 2 fixed to the lower surface of the existing floor slab 1 is fixed to the lower surface of the existing floor slab 1 by bonding with an adhesive 5 such as an epoxy resin.

The method for reducing the heavy floor impact sound of the existing floor slab according to the invention described in claim 4 is:
At intervals a fixed direction on the upper surface of the existing floor slab 1 which is surrounded by the beam 10, of the existing floor contact bonding the reinforcing member 2, such as a plurality of H-shaped steel slab 1 to stiffen and / or bolted It is fixed by means, and a support leg 4 for supporting the dry double floor 3 is installed on the reinforcing member 2 on the upper surface to improve the impedance of the floor slab 1.

The method for reducing the heavy floor impact sound of the existing floor slab according to the invention described in claim 5 is:
At intervals a fixed direction on the lower surface of the existing floor slab 1 which is surrounded by the beam 10, the upper surface of the reinforcement member 2, such as a plurality of H-beams to stiffen the same existing floor slab 1, adhesive and / or bolts provided fixed stop means, the same also fixed by means other adhesive and / or bolted to the reinforcement member 2 of H-section steel immediately upper location of the reinforcing member 2 of the lower surface to the upper surface of the existing floor slab 1 And providing a support leg 4 for supporting the dry double floor 3 on the reinforcing member 2 on the upper surface to improve the impedance of the floor slab 1.

The method for reducing the heavy floor impact sound of an existing floor slab according to claims 1 to 5 is configured such that the existing floor slab 1 is spaced apart in a certain direction from the lower surface and / or the upper surface of the existing floor slab 1 surrounded by the beam 10. the upper surface of the reinforcing member 2 of H-section steel of a plurality of the stiffening provided by fixing by means other adhesive and / or bolted, on an upper surface of the existing floor slab 1, which supports a dry double flooring 3 the support leg 4, to improve the impedance of the floor slab 1 is mounted on a straight upper location of the reinforcing member 2 of the a method of reducing the light floor impact sound propagating under floor dwelling unit, the existing floor slab Since the increase in the surface density (weight) of 1 is made as small as possible to improve the rigidity efficiently and improve the impedance of the floor slab 1, the heavy floor impact sound can be effectively reduced.

  In general, a floor slab of a ramen frame has a resonance frequency in the 63 Hz band (45 Hz to 90 Hz) that determines a heavy floor impact sound level, but is rigid by minimizing the increase in surface density (weight) of the existing floor slab 1. By efficiently improving the resonance frequency, the resonance frequency can be moved to a higher frequency band. As a result, the driving point impedance can be greatly increased, and the heavy floor impact sound of the existing floor slab 1 can be greatly reduced in the floor slab having a resonance frequency in the 63 Hz band.

When the reinforcing member 2 is installed on the back of the ceiling (the lower surface of the existing floor slab 1), it is suitable for a building with a low floor height that cannot be reinforced on the floor, or a living room or bedroom where it is desired to secure a ceiling height.
Moreover, since it does not affect the upper surface of the floor, it is advantageous for ensuring barrier-free.

  The method for reducing the heavy floor impact sound of an existing floor slab according to the present invention is implemented as follows in order to achieve the above-described effects.

1 , 2 , and 7 show an embodiment of a method for reducing the heavy floor impact sound of an existing floor slab according to claims 1 to 3 . The method for reducing the heavy floor impact sound of the existing floor slab is to stiffen the existing floor slab 1 by placing a gap in the short side direction on the lower surface of the existing floor slab 1 surrounded by the beam 10 such as a large beam or a small beam. The upper surface of a plurality of reinforcing members 2 such as H-shaped steels (five in FIG. 1) is fixed by means of adhesion and / or bolting, and both ends of the reinforcing member 2 are attached to the existing floor slab 1. surrounds provided fixed to the beam 10 or column 11, the upper surface of the existing floor slab 1, the support leg 4 supporting a dry double flooring 3, installed immediately upper location of the reinforcing member 2 of the said The impedance of the floor slab 1 is improved (the invention according to claim 1).

  The present invention is particularly preferably implemented when, for example, an office where heavy floor impact sound is not a problem is changed to an apartment house where heavy floor impact sound is a serious problem. In addition, the present invention is particularly preferably implemented on an existing floor slab 1 having a thickness of 150 to 180 mm used for heavy structures such as reinforced concrete structures and steel structures.

As shown in FIG. 2, the reinforcing member 2 in the illustrated example uses H-section steel. The H-shaped steel is arranged to the short side direction of the existing floor slab 1 which is surrounded by the beam 10, Ru Tei parallel five provided at a required pitch in approximately equal intervals.

Note that the number of H-shaped steels 2 used as the reinforcing member 2 is not limited to five, and is appropriately increased or decreased according to the size of the existing floor slab 1 and the required slab rigidity. The reinforcing member 2 is preferably installed in the direction of the short side of the existing floor slab 1 as shown in the example in order to minimize the structural design burden due to the increase in mass of the existing floor slab 1. However, it can also be implemented by installing in the long side direction of the existing floor slab 1. Moreover, although the reinforcement member 2 which concerns on a present Example is implemented with the H-section steel 2, it is not limited to this, As long as the existing floor slab 1 can be rigidly stiffened, I-shaped steel, channel-shaped steel, The same can be done for box steel. The material is not limited to steel and can be made of aluminum or FRP. Example 2 and Example 3 described below have the same technical idea.

  The arrangement pattern of the reinforcing member 2 is not limited to the illustrated example, and can be implemented as shown in FIG. 3 as will be described later.

  Note that the reinforcing member 2 is firmly fixed to the existing floor slab 1. This is because by fixing the reinforcing member 2 firmly to the lower surface of the existing floor slab 1, the concrete of the existing floor slab 1 becomes a compression region and the reinforcing member 2 is fully tensioned, so that an increase in rigidity can be expected.

Various methods for fixing the reinforcing member 2 to the existing floor slab 1 are conceivable. In this embodiment, as shown in FIG. 2, an adhesive 5 such as an epoxy resin is applied to the entire upper surface of the upper flange of the H-shaped steel 2. Is applied and fixed to the lower surface of the existing floor slab 1 by adhesion. The fixing method is not limited to the adhesive 5, bolted, or Ru can also be carried out in combination with the adhesive 5 and bolted. In addition, when bonding with the adhesive 5, in addition to applying the adhesive to the entire surface where the reinforcing member 2 and the existing floor slab 2 are in contact, the adhesive is applied to both ends and the center of the reinforcing member 2, etc. The adhesion site can be appropriately set so as to obtain the required rigidity increase. Moreover, when it implements by bolting, if the resin mortar etc. are inject | poured into the clearance gap between the contact surface of the reinforcement member 2 and the existing floor slab 1, the adhesion effect will increase further. Example 2 and Example 3 described below have the same technical idea.

Support legs 4 of the dry double flooring 3, in order to contribute to minimized the heavy floor impact sounds, stiffening of the existing floor slab 1, i.e. arranged in a straight upper location of the reinforcing member 2. The position where the existing floor slab 1 is vibrated is rigidly reinforced from the lower surface of the existing floor slab 1 by the reinforcing member 2, so that the rigidity of the existing floor slab 1 is increased and impedance (an evaluation index of heavy floor impact sound level) is improved. Because it can be done. Therefore the support legs 4 of a dry double flooring 3, as in the illustrated example, is preferably placed immediately above the position of the reinforcing member (2). However, even when the pitch of the support legs cannot match the pitch of the reinforcing members 2, it is preferable that the support legs 4 be installed as close to the reinforcing members 2 as possible. Example 2 and Example 3 described below have the same technical idea.

  According to the method for reducing the weight floor impact sound of the existing floor slab having the above configuration, the increase in the surface density (weight) of the existing floor slab 1 is minimized as compared with the conventional technique in which the slab thickness is simply designed and constructed. Thus, the rigidity can be improved efficiently, so that the rigidity of the existing floor slab 1 can be increased and the impedance (evaluation index of the heavy floor impact sound level) can be improved. The analysis results for proving this effect are shown below.

<Analysis example 1>
Below, the rise effect of the basic impedance level of the existing floor slab 1 by rigid stiffening is examined. The effect of increasing the basic impedance level of the existing floor slab 1, which is a main factor for determining the driving point impedance level, is examined.

  The thickness of the existing floor slab 1 is 150 mm, the installation pitch L of the H-section steel (see FIG. 2) is 600 mm, and the improvement effect of the basic impedance level is analyzed according to various sizes of the H-section steel 2. The result is shown in FIG. The results when the installation pitch L of the H-section steel is 900 mm are shown in FIG.

As can be seen from this table, when the installation pitch of the H-section steel is 600 mm, there is an effect of increasing the impedance level by about 4.9 dB to 8.5 dB, and when the installation pitch is 900 mm, the impedance level is 3.8. There is an effect of increasing by about 6.9 dB. On the other hand, weight gain, if the installation pitch of 600 mm, with about 28~52kg / ^{m 2,} if the installation pitch of 900mm is about 19~35kg / ^{m 2,} with a slab equivalent thickness (same effect It can be seen that a weight increase of about ¼ is sufficient as compared with the case of a homogeneous single plate slab having a thickness of (a slab thickness) (a conventional technique in which a so-called slab thickness is simply designed and constructed).

  Therefore, it can be seen from this analysis example 1 that when the existing floor slab 1 is reinforced, the impedance level can be effectively increased while suppressing an increase in weight.

<Analysis example 2>
The driving point impedance that determines the heavy floor impact sound level is affected by the floor slab resonance characteristics. The degree depends on the natural frequency of the existing floor slab 1, but the natural frequency is also affected by reinforcing the existing floor slab 1 by integrating the H-shaped steel. Here, the effect is examined. The result is shown in FIG.

  From FIG. 6, the primary natural frequency, which was about 60 Hz, is approximately 90 Hz or more, and shows a tendency to deviate from the 63 Hz band (specifically, 45 to 90 Hz). This effect is remarkably generated by the present construction method for stiffening the existing floor slab 1 while keeping the surface density at a relatively small value.

  Therefore, according to the method for reducing the heavy floor impact sound of the existing floor slab having the above-described configuration, the dry double floor 3 is provided on the upper surface of the existing floor slab 1 to reduce the lightweight floor impact sound that propagates to the lower floor dwelling unit. Needless to say, it can be seen that by increasing the surface density (weight) of the existing floor slab 1 as much as possible and improving the rigidity efficiently, the heavy floor impact sound can be effectively reduced.

  In general, the floor slab of the rigid frame has a resonance frequency in the 63 Hz band that determines the heavy floor impact sound level, but the increase in the surface density (weight) of the existing floor slab is minimized to improve the rigidity efficiently. By doing so, the resonance frequency can be moved to a higher frequency band. As a result, the driving point impedance can be greatly increased, and the heavy floor impact sound of the existing floor slab 1 can be effectively reduced in the floor slab 1 having a resonance frequency in the 63 Hz band.

In addition, as mentioned above, the reinforcement method of the existing floor slab 1 considers making the burden on the structural design by the mass increase of the existing floor slab 1 as small as possible, and the shape of the said reinforcement member 2, a dimension, the number, Note that installation pitch and installation pattern are selected. Specifically, in addition to the installation pattern shown in FIG. 1, as shown in FIG. 3A, when the reinforcing member 2 is sparsely arranged in a portion with a low impedance such as the center of the existing floor slab 1, Ru can be efficiently reduced heavy floor impact sounds of the existing floor slab 1.

  As another arrangement pattern of the reinforcing member 2, as shown in FIG. 3B, an installation pattern in which the reinforcing members 2 are arranged in a cross shape with the central portion of the existing floor slab 1 as an intersection can be considered. In addition, as shown in FIGS. 3C to 3E, an installation pattern that reinforces the diagonal line of the slab that is considered to have a relatively large deflection within the surface of the existing floor slab 1 is also conceivable. In particular, when joining the reinforcing members 2 as shown in FIGS. 3D and 3E, it is necessary to devise such as processing the end portions of the ready-made reinforcing members 2.

By the way, with regard to the dry double floor 2, the wooden panel material is attached with a cushioning rubber material as a floor finish material from the viewpoint of prevention of lightweight floor impact noise caused by the fall of light objects and dragging of furniture, and maintenance planning. In many cases, a dry double floor supported by a leg is used, but this dry double floor tends to amplify a heavy floor impact sound. This method is premised on the combination of dry double floors as a countermeasure for lightweight floor impact sounds, but in order to prevent amplification of heavy floor impact sounds, dry double floor panels should be heavy and supported. The lower end of the leg is preferably a shock-absorbing rubber tool that absorbs vibration .

Further, the first embodiment, the H-shaped steel 2 used as a pre-Symbol reinforcing member 2, not only fixes the upper surface of the upper flange, carried and fixed to the column 11 or beam 10 is also the end It is . The upper surface of the upper flange of the H- shaped steel 2 is fixed by using the adhesive 5 and the bolt 6 together, and both ends of the reinforcing member 2 are fixed by the bolt 6.

Thus, the end portion of the reinforcing member 2, by restraining integrated into column 11 or beam 10, so it can be expected to improve the rigidity, which contributes to a reduction in weight floor impact. Further, when the end portion of the reinforcing member 2 is installed to restrain the beam 10 or the like, because the mass of the reinforcement member 2 does not act as a load on the existing floor slab 1, structural strain on the existing floor slab 1 There is an advantage that can be minimized . Na us, the end as shown in FIG. 8C, may be provided in combination with a reinforcing member 2a which is constrained integrally to the column 11 or beam 10, a reinforcing member 2b which does not restrict the end.

Below, the effect which concerns on Example 1 is demonstrated compared with the prior art which only designs and builds slab thickness.

<Analysis example 3>
For example, the existing floor slab 1 is simplified as a concrete product (unit width, thickness 150 mm), and one reinforcing member 2 (H-section steel: 150 × 150 × 7 × 10), as shown in FIG. 10A, When installed integrally with a concrete beam (no end restraint, 100 mm gap between the end of the reinforcing member 2 and the beam), the equivalent bending of the composite beam converted from the center deflection when a concentrated load is applied to the center of the composite beam As shown by the white circle of the upward arrow in FIG. 9, it can be seen that the flexural rigidity increases about seven times that when the reinforcing member 2 is not used (concrete beam only).

By the way, the impedance level (Lz) of the floor slab is expressed by the following formula: Lz = 20 · log ₁₀ (8√ (B · m)) dB {B: bending rigidity of slab m: weight per unit area of slab Sa}.

Actually, even if a plurality of reinforcing members 2 are installed on the existing floor slab 1, the effect of rigidity reinforcement cannot be expected as it is. However, when the bending rigidity is increased by 5 times, from the above formula, 20 · log ₁₀ {(8 √ (5 B · m) / (8√ (B · m)) = 20 · log ₁₀ (√5) = Since the sound insulation effect can be expected to be about 7 dB, a plurality of reinforcing members 2 are installed on the existing floor slab 1. By doing so, the rigidity of the entire floor slab can be improved, and the sound insulation effect can be improved by about one rank from FIG.

Further, as shown in FIG. 10B, by constraining the end of the reinforcing member 2 by integrating it with the beam 10 or the column 11, it is possible to make the constraint condition of the end rigid and further increase the slab rigidity. is there. Based on the same idea as described above, when an H-section steel (150 × 150 × 7 × 10) is used as the reinforcing member 2, when the end of the reinforcing member 2 is constrained, the equivalent bending deflection rigidity of the entire composite beam is as shown in FIG. As shown by the black circle of the upward arrow, it can be seen that the height rises to about 14 times that when the reinforcing member 2 is not used (concrete beam only). Therefore, when the bending rigidity is 14 times, from the above formula, 20 · log ₁₀ {(8√ (14 B · m) / (8√ (B · m)) = 20 · log ₁₀ (√14) = 11.5 dB Since the improvement of the sound insulation effect can be expected, the rigidity of the entire floor slab can be improved by installing the plurality of reinforcing members 2 on the floor slab 1, and the sound insulation effect can be improved by about two ranks from FIG.

As described above, when the slab rigidity is reinforced, the primary natural frequency of the slab also changes accordingly, and the driving point impedance can be greatly increased outside the 63 Hz band that is the resonance frequency.
[Example 2 ]

FIGS. 12-14 has shown the Example of the reduction method of the heavy floor impact sound of the existing floor slab based on the invention described in Claim 4. As shown in FIG. In this method of reducing the heavy floor impact sound of an existing floor slab, the existing floor slab 1 is stiffened at a certain distance from the upper surface of the existing floor slab 1 surrounded by a beam 10 such as a large beam or a small beam. A plurality of reinforcing members 2, such as H-shaped steel, are provided by bonding and / or bolting means, and a support leg 4 of a dry double floor 3 is provided on the upper surface of the reinforcing member 2, and the floor slab 1 is provided. The impedance is improved (the invention according to claim 4 ).

Specifically, the reinforcing member 2 according to the second embodiment shown in FIGS. 12A to 12C uses the H-section steel 2 as in the first embodiment. The H-section steel 2 is arranged in the short-side direction of the existing floor slab 1 surrounded by the beam 10, and is provided by providing five parallel lines at a required pitch at substantially equal intervals. The support leg 4 of the dry double floor 3 is provided on the upper surface of the reinforcing member 2, and the end of the existing floor slab 1 is directly provided on the upper surface of the existing floor slab 1.

Incidentally, FIG. 13 shows different variations of the support legs 4 of the dry double floor 3. 14A and 14B, in order to reduce the heavy floor impact sound of the existing floor slab 1 more efficiently, the reinforcing member 2 is densely arranged in a portion having a small impedance, such as a central portion of the existing floor slab 1, and that shows an example of arranging the sparsely site impedance is large, such as the ends of the slab 1.

In short, the second embodiment is almost the same as the first embodiment except that the reinforcing member 2 is mainly provided on the upper surface of the existing floor slab 1 as compared with the first embodiment. Play. Further, an end portion of the reinforcing member 2 when performed by fixing the pillars 11 and beams 10, that Sosu substantially the same operational effects as the first embodiment.
[Example 3 ]

FIG. 15 shows an embodiment of a method for reducing a heavy floor impact sound of an existing floor slab according to the invention described in claim 5 . The method for reducing heavy floor impact sounds of the existing floor slab, girders or joists at intervals a fixed direction under surface of the existing floor slab 1 which is surrounded by the beam 10, such as, stiffening the existing floor slab 1 The upper surface of a plurality of reinforcing members 2 such as H-shaped steel is fixed by means of adhesion / bolting , and the H-shape is formed on the upper surface of the same existing floor slab 1 directly above each reinforcing member 2 on the lower surface. provided to fix the reinforcement member 2, such as steel with an adhesive and / or bolted means, the upper surface of the reinforcing member 2 of the top surface, the floor slab support legs 4 supporting a dry double flooring 3 Installation The impedance is improved (the invention according to claim 5 ).

The third embodiment, in short, a composite of Example 1 and Example 2, by providing the reinforcing member 2 to the upper surface and the lower surface of the existing floor slab 1, as compared with Examples 1 and 2, The floor slab 1 with higher rigidity can be provided. Therefore, it can be expected that the heavy floor impact sound of the existing floor slab 1 can be further reduced.

  Although the embodiments have been described with reference to FIGS. 1 to 15, the present invention is not limited to the embodiments of the illustrated examples, and design changes that are usually made by those skilled in the art without departing from the technical idea thereof, Note that it includes a range of application variations.

A is the top view which showed schematically the installation state of the reinforcement member with respect to the existing floor slab about the reduction method of the heavy floor impact sound of the existing floor slab which concerns on Example 1, B shows the said Example 1. FIG. FIG. It is the elements on larger scale of FIG. 1B. AE is the schematic which showed the variation of the reduction method of the heavy floor impact sound of the existing floor slab which concerns on Example 1, respectively. It is the table | surface which showed the amount of impedance level rises, etc. at the time of installing H shape steel integrally with a slab by pitch 600mm. It is the table | surface which showed the impedance level rise amount etc. at the time of installing H-section steel integrally with a slab by pitch 900mm. It is the table | surface which showed the change of rigidity, surface density, and primary natural frequency at the time of installing H-section steel integrally with a slab. It is the side view which showed the reduction method of the heavy floor impact sound of the existing floor slab which concerns on Example 1. FIG. AC is the schematic which showed the variation of the reduction method of the heavy floor impact sound of the existing floor slab which concerns on Example 1 , respectively. For the reinforcing member that constrains the end and the reinforcing member that does not constrain the end, the horizontal axis represents the equivalent rigidity of the H steel integrated part / the rigidity of the concrete beam, and the vertical axis represents the deflection due to the concentrated load at the center of the span. It is the table | surface which represented and contrasted the bending rigidity of the composite beam / concrete beam rigidity. FIG. 10A is a side view showing a reinforcing member that does not restrain the end portion according to FIG. 9, and FIG. 10B is a side view showing the reinforcing member that restrains the end portion according to FIG. It is a graph showing the grade of the sound insulation effect. A is methods for reducing heavy floor impact sounds of the existing floor slab according to Embodiment 2 is a plan view schematically illustrating an installation state of the reinforcing member to the existing floor slab, B denotes the Example 2 C is a partially enlarged view of B. FIG. It is the schematic which showed the variation of the reduction method of the heavy floor impact sound of the existing floor slab which concerns on Example 2. FIG. A is methods for reducing heavy floor impact sounds of the existing floor slab according to Embodiment 2 is a plan view showing a variation of the work state of the reinforcing member to the existing floor slab, B showed the Example 2 It is a front view. It is the front view which expanded partially and showed the reduction method of the heavy floor impact sound of the existing floor slab which concerns on Example 3. FIG.

Explanation of symbols

1 Existing floor slab 2 Reinforcement member (H-shaped steel)
3 Dry double floor 4 Support leg 5 Adhesive 6 Bolt 10 Beam 11 Pillar

Claims (5)

At intervals to short side direction on the lower surface of the existing floor slab, surrounded by the beams, the upper surface of the reinforcing member such as a plurality of H-beams to stiffen the same existing floor slab, adhesive and / or bolted means And both ends of the reinforcing member are fixed to a beam or a column surrounding the existing floor slab, and support legs for supporting the dry double floor are provided on the upper surface of the existing floor slab. characterized by improving the impedance of the floor slab installed immediately upper location of the member, a method for reducing heavy floor impact sounds of the existing floor slab.   The existing floor slab according to claim 1, wherein the reinforcing member fixed to the lower surface of the existing floor slab is fixed in a state where the lower surface of the existing floor slab becomes a compression region and the entire cross section is pulled. To reduce heavy floor impact sound. The weight floor of the existing floor slab according to claim 1 or 2, wherein the reinforcing member fixed to the lower surface of the existing floor slab is fixed to the lower surface of the existing floor slab by bonding with an adhesive such as epoxy resin. A method of reducing impact noise. At intervals a fixed direction on the upper surface of the existing floor slabs surrounded by a beam, fixed with contact adhesive and / or bolted means a reinforcement member such as a plurality of H-beams to stiffen the same existing floor slab A method for reducing heavy floor impact sound of an existing floor slab, wherein a support leg for supporting a dry double floor is installed on a reinforcing member on the upper surface to improve impedance of the floor slab. At intervals a fixed direction on the lower surface of the existing floor slab, surrounded by the beams, the upper surface of the reinforcing member such as a plurality of H-beams to stiffen the same existing floor slab, by means of adhesive and / or bolted provided fixed, provided and fixed by a means of an adhesive and / or bolted to the reinforcement member of H-shaped steel or the like to direct the higher location of the reinforcing members of the bottom surface to the upper surface of the same existing floor slab, the reinforcement of the top surface A method for reducing a heavy floor impact sound of an existing floor slab, wherein a support leg that supports a dry double floor is installed on a member to improve impedance of the floor slab.

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