JP2013087479A - Soundproof structure of building and floor structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a soundproof performance without increasing a height from an underfloor to a floor surface.SOLUTION: A soundproof structure 1 of a building comprises: a first long-length U-shaped member 2 for which sidewall parts 12 are erected in parallel with each other on both sides of a bottom wall part 11; a second long-length U-shaped member 4 extendingly arranged on the first long-length U-shaped member 2, for which sidewall parts 14 are erected in parallel with each other on both sides of a bottom wall part 13; and an elastic member 3. The soundproof structure 1 of a building is arranged such that an inner surface of the first long-length U-shaped member 2 and an inner surface of the second long-length U-shaped member 4 face each other and the bottom wall parts 11 and 13 are in parallel with each other, and is assembled by holding the elastic member 3 by the bottom wall part 11 of the first long-length U-shaped member 2 and the bottom wall part 13 of the second long-length U-shaped member 4.

Description

  The present invention relates to a soundproof structure and a floor structure of a building, and more particularly to a soundproof structure and a floor structure of a building that can reduce a floor impact sound that affects the downstairs in the building.

  The demand for sound insulation for the floors of two or more floors of buildings is increasing year by year, and in particular, in a multi-family house where multiple households live in one building, high sound insulation performance is required. In addition, there is a background that demand for two-family houses is increasing in detached houses, and soundproofing measures for floors of two or more floors are a major issue.

  The current technology for such soundproofing requirements is basically to secure soundproofing performance by increasing the rigidity of the floor base material, for example, by increasing the thickness of concrete in an apartment house. However, increasing the rigidity of the floor base material causes a significant cost increase, and there is a problem that it is necessary to increase the strength and height of the entire building.

  Also, adopt a dry double floor structure that ensures soundproofing performance by making a double floor surface by supporting a floor panel made of plywood etc. via a support leg on a floor base material made of concrete, etc. Is also known as an effective measure (see, for example, Patent Document 1).

JP-A-11-293897

  However, although the floor structure as described in Patent Document 1 has a large improvement in the lightweight floor impact sound, a great effect cannot be expected in the heavy floor impact sound, and the height from the floor base to the floor surface (hereinafter, There is a problem that the floor finish is called high. On the other hand, measures are also taken to install flooring with high soundproofing and vibration control mats with high specific gravity on the floor surface, but all of them are limited to light floor impact sound and produce high effect with heavy floor impact sound. Has become difficult.

  This invention was made in order to solve the above-mentioned problem, and can improve the soundproof performance without increasing the height from the floor base to the floor (finished height of the floor). An object of the present invention is to provide a soundproof structure and a floor structure.

In order to solve the above problems, the present invention provides the following soundproof structure and floor structure of a building.
That is, the soundproof structure for a building according to the present invention includes a first long U-shaped member whose side walls are erected in parallel on both sides of the bottom wall, and the first long U-shaped member. A second elongate U-shaped member that is disposed and has side wall portions standing on both sides of the bottom wall portion, and an elastic member made of an elastic body, and an inner surface of the first elongate U-shaped member; The inner surface of the second long U-shaped member is opposed to each other, and the bottom wall portions are arranged in parallel to each other, and the elastic member is disposed on the bottom wall portion of the first long U-shaped member and the second It is characterized by being sandwiched and assembled with the bottom wall portion of the long U-shaped member.

  According to the soundproof structure of this building, since the first long U-shaped member and the second long U-shaped member constituting the soundproof structure are formed in a U shape having a side wall portion, the soundproof structure The rigidity becomes higher and it becomes difficult to bend. Thereby, the impact which generate | occur | produced in the wide range can be directly transmitted to an elastic member, and soundproof performance improves. Furthermore, by making the long U-shaped members U-shaped and arranging them so that the inner surfaces of the respective long U-shaped members face each other, the height of the soundproof structure can be suppressed while ensuring rigidity. The finished height of the floor structure using the structure can be reduced.

The width of the bottom wall portion of the first long U-shaped member is preferably wider than the width of the bottom wall portion of the second long U-shaped member.
According to this configuration, since the bottom wall portion of the first long U-shaped member is exposed when viewed from the second long U-shaped member side, the bottom wall portion of the first long U-shaped member is, for example, a floor base. When fixing, it becomes easy to insert a tool and the workability of the soundproof structure is improved.

Moreover, it is preferable that the said elastic member is formed with the hollow part along the longitudinal direction of said 1st long U-shaped member and said 2nd long U-shaped member.
According to this configuration, the elasticity of the elastic member can be made in accordance with the cross-sectional shape of the hollow portion together with the elasticity of the material, so that it is easy to achieve the optimum elasticity.

  The floor structure of the present invention is the soundproof structure according to the present invention, wherein the first long U-shaped member has a plurality of soundproof structures disposed so that a bottom wall portion faces down, and the second long structure. It consists of a plywood placed on the bottom wall portion of the U-shaped member and a finishing material disposed above the plywood, and the plywood is fixed to the second long U-shaped member by a fastening member. In addition, the first long U-shaped member is fixed to the floor base by a fastening member.

In the floor structure, a plate-like or mat-like interposition member having a specific gravity of 1.0 g / cm ³ or more is disposed between the plywood and the finishing material or between the plywood and the soundproof structure. Preferably it is.
According to this configuration, the gap between the components positioned above the soundproof structure is less likely to occur due to the weight of the interposition member itself, and hence the floor impact sound absorbing action of the elastic member can be further promoted.

Moreover, it is preferable that a plate-like member having a compressive strength equal to or higher than that of the plywood is disposed between the plywood and the finishing material or between the plywood and the soundproof structure.
According to this configuration, the rigidity of the entire laminated body above the soundproof structure is increased by the rigidity of the plate-like member, and it becomes possible to transmit an impact to the elastic member more directly and the soundproof performance is improved.

Moreover, it is preferable that a vibration-damping mat made of asphalt material is laid between the soundproof structures provided on the floor base at intervals.
Moreover, it is preferable that a laminated member is laminated on the vibration damping mat, and a height of the vibration damping mat and the laminated member is the same as a height of the soundproof structure.

  According to this configuration, the soundproof performance can be improved by filling the space where the soundproof structure is not disposed with the damping mat and the laminated member.

  According to the present invention, impact can be absorbed in a wide range without greatly increasing the height from the floor base to the floor surface, and the finished height of the floor structure can be lowered.

It is sectional drawing of the floor structure concerning embodiment of this invention. It is a perspective view of the soundproof structure concerning an embodiment of the present invention. FIG. 3 is a side view of the soundproof structure, as viewed from an arrow A in FIG. 2. It is a perspective view of the elastic member which concerns on embodiment of this invention. It is sectional drawing of the floor structure of the Example of a performance evaluation test. It is sectional drawing of the floor structure of the comparative example 1 of a performance evaluation test. It is sectional drawing of the floor structure of the comparative example 2 of a performance evaluation test.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
This embodiment is specifically described for better understanding of the gist of the invention, and does not limit the present invention unless otherwise specified.

FIG. 1 is a cross-sectional view showing a residential floor structure 50 according to an embodiment of the present invention.
As shown in FIG. 1, a floor structure 50 according to the present embodiment is mounted on a plurality of soundproof structures 1 fixed on a floor foundation F and the soundproof structure 1, and the soundproof structure 1 is formed by screws S. A plywood 6 fixed to the plywood 6, a first damping mat 7 placed on the plywood 6, and placed on the first damping mat 7. And a finishing material 8 to be fixed.

  The plurality of soundproof structures 1 are installed on the floor foundation F at predetermined intervals. A second damping mat 9 is laid between the plurality of soundproof structures 1 and directly above the floor foundation F, and a sound absorbing material 10 is laminated on the second damping mat 9. . As is clear from FIG. 1, the height of the laminated body of the second vibration damping mat 9 and the sound absorbing material 10 is the same as the height of the soundproof structure 1. In other words, the upper surface of the sound absorbing material 10 and the upper surface of the soundproof structure 1 are set to be flush with each other.

  In addition, when the space | interval of the several sound-insulation structure 1 is narrow, you may abbreviate | omit installation of the 2nd damping mat 9 and the sound-absorbing material 10. FIG.

  Next, the soundproof structure 1 used for the floor structure 50 of this embodiment will be described. As shown in FIG. 2, the soundproof structure 1 includes a first long U-shaped member 2 disposed on the floor base F and a plurality of elastic members disposed at equal intervals on the first long U-shaped member 2. It consists of the member 3 and the second long U-shaped member 4 disposed on the plurality of elastic members 3. The width of the second long U-shaped member 4 is formed wider than the width of the first long U-shaped member 2.

  The first long U-shaped member 2 is formed by bending a metal plate having a thickness of 0.8 mm into a U-shape. As the metal plate, for example, a galvanized steel plate can be suitably used. Specifically, the first long U-shaped member 2 includes a long bottom wall portion 11 and side wall portions 12 erected on both sides of the bottom wall portion 11. In the present embodiment, the width of the bottom wall portion 11 is 65 mm, and the height of the side wall portion 12 is 10 mm. The length of the first long U-shaped member 2, that is, the length of the soundproof structure 1 is appropriately set according to the size of the plywood 6. For example, when the size of the plywood 6 is 3 × 6 (90 cm × 180 cm), it is preferably 180 cm.

  The second long U-shaped member 4 includes a bottom wall portion 13 and side wall portions 14 erected on both sides of the bottom wall portion 13, except that the width of the bottom wall portion 13 is 40 mm. The configuration is the same as that of the one long U-shaped member 2. That is, the width of the first long U-shaped member 2 is 25 mm wider than that of the second long U-shaped member 4.

However, the 1st long U-shaped member 2 and the 2nd long U-shaped member 4 can employ | adopt widely the metal long member formed in cross-sectional U shape, The material is also limited to a galvanized steel plate. For example, stainless steel, aluminum or the like can be used.
In addition, each dimension of the long U-shaped members 2 and 4 is not limited to the above-described numerical values and can be appropriately deflected. However, as described above, the width of the second long U-shaped member 4 is The width of the first long U-shaped member 2 is preferably wider. Moreover, in order to ensure rigidity, the height of the side wall portions 12 and 14 is preferably as high as possible. However, it is necessary to make the height sufficiently lower than the height of the elastic member 3. Furthermore, although it is preferable to increase the thickness of the metal plate in terms of ensuring rigidity, it is preferable to reduce the total thickness of the floor structure, and in combination with the height of the side walls 12 and 14 described above, It is necessary to set the thickness so that the rigidity of the long U-shaped members 2 and 4 can be secured.

  As shown in FIG. 3, the elastic member 3 is a square cylindrical block body made of a member having elasticity, for example, synthetic rubber. The rectangular cylindrical elastic member 3 includes an upper plate portion 15 and a lower plate portion 16 and side wall portions 17 that connect the upper plate portion 15 and the lower plate portion 16 on both sides, thereby forming a rectangular tube shape. A hollow portion 18 penetrating in the longitudinal direction is formed.

In this embodiment, the height of the elastic member 3 is 13 mm, and the thicknesses of the upper plate portion 15 and the lower plate portion 16 are 2 mm, respectively. Moreover, the side wall part 17 is not restricted to a linear shape, For example, you may form in the waveform.
Further, the length of the elastic member 3 in the longitudinal direction is not particularly limited, but the length of the elastic member 3 of the present embodiment is 40 mm.

  The soundproof structure 1 includes a first long U-shaped member 2, a plurality of elastic members 3, and a second long U-shaped member 4, and an inner surface of the first long U-shaped member 2 and a second long U-shaped member. And the bottom wall 11 of the first long U-shaped member 2 and the bottom wall 13 of the second long U-shaped member 4 are arranged so as to be parallel to each other. Further, a plurality of elastic members 3 are sandwiched between the first long U-shaped member 2 and the second long U-shaped member 4.

The plurality of elastic members 3 and the long U-shaped members 2 and 4 are bonded by an adhesive tape. At this time, the long U-shaped members 2 and 4 are bonded evenly to the left and right so that the distance between the elastic member 3 and the side wall portions 12 and 14 of the long U-shaped members 2 and 4 is equal. That is, as shown in FIG.
A gap G is provided on each side of the second long U-shaped member 4 between the side wall 14 of the second long U-shaped member 4 and the side wall 12 of the first long U-shaped member 2. It is done.
By such a combination, the thickness of the soundproof structure 1 is suppressed to about 14.6 mm.

  A plurality of elastic members 3 are installed along the longitudinal direction of each of the long U-shaped members 2 and 4. The installation interval of the elastic members 3 can be changed as appropriate, but in this embodiment, the elastic members 3 are arranged at intervals of 303 mm.

  The floor foundation F is made of concrete. The floor foundation F is not limited to concrete, and may be composed of an ALC panel (Autoclaved Lightweight aerated Concrete), or may be configured by striking a plywood or particle board on the concrete.

  The first vibration suppression mat 7 and the second vibration suppression mat 9 are mats made of an asphalt material in which an asphalt mixed material in which an inorganic filler is mixed and dispersed in asphalt is formed in a sheet shape. The thickness of the damping mats 7 and 9 is 3 to 12 mm.

In terms of soundproof performance, it is preferable that the damping mats 7 and 9 increase the specific gravity of the asphalt material itself to ensure a higher surface density. The specific gravity depends on the specific gravity of the inorganic filler and the mixing amount. Is done. The specific gravity of the vibration damping mats 7 and 9 is preferably 2.0 to 4.0 g / cm ³ , more preferably from the viewpoints of workability as a vibration damping and sound insulating material, transportability, limit of filler input amount, cost, and the like. Is 2.5 to 3.5 g / cm ³ .

The sound absorbing material 10 is made of a nonwoven fabric made of a polyester resin, and has a thickness of about 3 mm to 10 mm. The sound-absorbing material 10 is not limited to the above-described nonwoven fabric, and may be, for example, a nonwoven fabric or foam made of other resin fibers or natural fibers, or glass wool or rock wool as long as it is a laminated member as a soundproofing material or heat insulating material. be able to.
The finishing material 8 is a flooring material such as a flooring block.

Next, a detailed installation configuration of the soundproof structure 1 will be described.
The arrangement of the soundproof structure 1 is set considering that the elastic members 3 constituting the soundproof structure 1 are evenly arranged in a plan view.

  First, the arrangement of the plurality of soundproof structures 1 is preferably set according to the size of the plywood 6 placed on the soundproof structure 1. For example, when the size of the plywood 6 is 3 × 6 In this case, the interval between the soundproof structures 1 is preferably 303 mm. Moreover, when the plywood 6 is a meter module, it is preferable that the mutual space | interval of the soundproof structure 1 shall be 500 mm, for example. That is, it is preferable that the interval between the soundproof structures 1 is appropriately determined according to the size of the structure placed on the soundproof structure 1.

  The plurality of elastic members 3 arranged in the soundproof structure 1 are arranged at the same interval as the mutual interval of the soundproof structure 1. For example, when the mutual space | interval of the soundproof structure 1 is 303 mm, it sets so that the elastic member 3 which comprises the soundproof structure 1 may also be arrange | positioned at a space | interval of 303 mm. In addition, the elastic member 3 is good also as one elastic member extended over the longitudinal direction of the elongate U-shaped members 2 and 4, without arrange | positioning the some elastic member 3. FIG.

Next, the construction method of the floor structure 50 of this embodiment is demonstrated.
As shown in FIG. 1, the soundproof structure 1 is attached to the floor base F using a portion where the bottom wall portion 11 between the side wall portion 12 of the first long U-shaped member 2 and the elastic member 3 is exposed. . Specifically, the soundproof structure 1 is formed by inserting a tool through the gap indicated by the symbol G in FIG. 1 and directly punching the exposed portion of the bottom wall portion 11 of the first long U-shaped member 2 with a screw S. Fixed. In addition, as a fixing method of the U-shaped member, a method of forming a fixing hole in the U-shaped member in advance and fixing the screw through the hole may be employed.

  Next, the second damping mat 9 and the sound absorbing material 10 are laid between the plurality of soundproof structures 1. The second damping mat 9 and the sound absorbing material 10 are preferably spread over the entire exposed floor foundation F. Next, the plywood 6 is fixed from above the soundproof structure 1 using the screws S, and the first damping mat 7 and the finishing material 8 are placed on the plywood 6, and then the first using the screws S. The damping mat 7 and the finishing material 8 are fixed to the plywood 6.

  Note that the soundproof structure 1 having a length suitable for the size of the fixed plywood 6 can be prepared, and the soundproof structure 1 having various lengths according to the floor shape can be provided. For example, a short length of the soundproof structure 1 can be prepared in accordance with a narrow corridor, or the U-shaped member can be cut on the spot. Moreover, the position of the elastic member 3 can also be set freely.

  According to the above embodiment, the first long U-shaped member 2 of the soundproof structure 1 is firmly fixed to the floor base F with the screw S, and the second long U-shaped member 4 is fixed to the plywood 6 with the screw S. The Since the first long U-shaped member 2 and the second long U-shaped member 4 are individually fixed, the plywood 6 and the floor base F are connected only by the elastic member 3 between the long U-shaped members 2 and 4. It becomes a structure. With such a structure, the floor structure 50 can be provided in which the finishing material 8 side and the floor base F side are made independent, and floor impact sound generated on the finishing material 8 side can be reduced.

  In addition, since the first elongate U-shaped member 2 and the second elongate U-shaped member 4 constituting the soundproof structure 1 are formed in a U-shape having the side walls 12 and 14, the rigidity of the soundproof structure 1. Becomes higher and is less likely to bend, it is possible to directly transmit the impact generated in a wide range to the elastic member 3 and improve the soundproof performance.

  Further, since the height of the soundproof structure 1 is kept low, the overall height of the floor structure 50 (finished thickness of the floor) can be further reduced. Thereby, a floor structure with high soundproofing performance can be adopted even for a detached house where it was difficult to adopt high soundproofing measures.

  Further, since the width of the first long U-shaped member 2 is made wider than the width of the second long U-shaped member 4, the bottom wall portion 11 of the first long U-shaped member 2 is exposed as viewed from above. When the bottom wall portion 11 of the first long U-shaped member 2 is fixed to the floor base F, it becomes easy to insert a tool.

  Further, by arranging the vibration damping mat 7 made of asphalt material between the plywood 6 and the finishing material 8, vibration can be absorbed more and the vibration damping mat 7 itself can be positioned above the soundproof structure 1 due to the weight of the vibration damping mat 7 itself. Since it becomes difficult to produce a clearance gap between the component to perform, the floor impact sound absorption effect | action of the elastic member 3 can be promoted more.

  Furthermore, by arranging the second damping mat 9 and the sound absorbing material 10 between the soundproof structure 1 and the soundproof structure 1, the soundproof performance is further improved.

  In each embodiment, the screw S is used as a fastening member used for fixing the first long U-shaped member 2 to the floor base F, fixing the plywood 6, and fixing the finishing material 8. For example, a nail can be used for fixing.

  Moreover, although the elastic member 3 was set as the structure which has a hollow part, if it has a floor impact sound absorption effect, it will not be restricted to this shape, It is good also as a solid structure. However, from the viewpoint of adjusting the elasticity of the elastic member, when a solid structure is adopted, it may be necessary to use a soft synthetic rubber depending on the material of the elastic member.

  In the present embodiment, the first vibration damping mat 7 made of asphalt material is disposed between the plywood 6 and the finishing material 8, but the present invention is not limited to this. For example, a plate-like member having higher compressive strength may be arranged to increase the overall rigidity, thereby improving the effect of suppressing heavy floor impact sound. That is, the rigidity of the laminate above the soundproof structure 1 is increased by the rigidity of the plate-like member, and the floor impact sound can be transmitted to the elastic member 3 more directly. As a result, the heavy floor impact sound The suppression effect of is improved. As for the rigidity of such a plate-like member, it is preferable that the compressive strength is equal to or higher than that of the plywood.

As this plate-like member, for example, a plate-like member such as a gypsum board, a particle board, or a plywood can be employed.
However, as described above, considering the effect of applying a predetermined load to the elastic member 3 and the point of suppressing the height from the floor base F, the higher the specific gravity of these plate-like members, the better. For example, a plate member having a specific gravity of 1.0 g / cm ³ or more is preferable.
However, when a gypsum board is used, the height from the floor base becomes high, so it is necessary to determine the selection of the adoption in consideration of the cost and the like.

Further, when at least one of the plywood 6 and the finishing material 8 has a sufficient weight, the first vibration damping mat 7 can be omitted.
Furthermore, the first damping mat 7 or the plate-like member may be disposed between the plywood 6 and the soundproof structure 1 instead of between the plywood 6 and the finishing material 8.

  In order to confirm the effectiveness of the present invention, the inventor of the present invention applied the following examples and comparative examples in accordance with the provisions of JIS A 1418-1 (method for measuring floor impact sound level at the building site). A performance evaluation test was conducted using the same.

(Example)
The floor structure 50 having the configuration shown in FIG. 5 was used. The plurality of soundproof structures 1 have a length of 180 cm, and the first long U-shaped member 2 and the second long U-shaped member 4 constituting the soundproof structure 1 are formed of a galvanized steel sheet having a thickness of 0.8 mm. did. The first long U-shaped member 2 had a width of 65 mm and a height of 10 mm. The second long U-shaped member 4 had a width of 40 mm and a height of 10 mm. As a result, the gap G becomes about 12 mm.
The elastic member 3 has a height of 13 mm, a width of 35 mm, and a length of 400 mm, and three elastic members 3 are installed in the longitudinal direction of the soundproof structure 1.
Moreover, the installation space | interval of the some soundproof structure 1 was about 300 mm.

  On the soundproof structure 1, a flooring material (1 × 6 parquet, 12 mm), a damping mat (4 mm), and a softwood plywood (12 mm), which are finishing materials, were laminated in order from the top. The sound absorbing material (nonwoven fabric made of polyester resin) was 6 mm thick, and the second damping mat was 8 mm thick. The total thickness, combined with the finishing material, was 42 mm.

The damping mat was formed into a sheet shape by mixing and dispersing an inorganic filler having a specific gravity of 6.0 g / cm ^{3 in} asphalt to a specific gravity of 3.5 g / cm ³ .
The downstairs ceiling has a structure in which two gypsum boards 22 (9.5 mm × 2) are attached to the lower surface of the rock wool board 21 (55 mm). As the floor base F, an ALC panel (100 mm) was used.

(Comparative Example 1)
The floor structure 51 having the configuration shown in FIG. 6 was used. The structure of the ceiling and the floor base was the same as in the example, and the particle board 23 (15 mm) was laminated between the floor base and the flooring floor material 8 (12 mm) as the finishing material. That is, the comparative example 1 is configured not to perform the soundproofing process.

(Comparative Example 2)
The floor structure 51 having the configuration shown in FIG. 7 was used. Between the flooring material 8 (12 mm), which is a finishing material, and the floor foundation F made of ALC panel, from the top, softwood plywood 6 (12 mm), damping mat 7 (8 mm), gypsum board 24 (12.5 mm) ). The vibration damping mat 7 was a vibration damping mat made of the same asphalt material as in the example. The total thickness, combined with the finishing material, was 44.5 mm.
The performance evaluation test results are shown in Table 1.

As shown in Table 1, in Comparative Example 2, both the light floor impact sound (LL) value and the heavy floor impact sound (LH) value were lower than those of Comparative Example 1 that was not subjected to soundproofing treatment.
Furthermore, compared with the comparative example 2, an Example has low both a lightweight floor impact sound (LL) value and a heavy floor impact sound (LH) value, although the total thickness from a floor foundation to a floor surface is reducing. became.

DESCRIPTION OF SYMBOLS 1 ... Soundproof structure, 2 ... 1st long U-shaped member, 3 ... Elastic member, 4 ... 2nd long U-shaped member, 6 ... Plywood, 7 ... 1st damping mat (plate-shaped member), 8 ... Finishing material, 9 ... second damping mat (damping mat), 10 ... sound absorbing material, 11 ... bottom wall, 12 ... side wall, 13 ... bottom wall, 14 ... side wall, 18 ... hollow part, 50 ... Floor structure, F ... floor foundation, S ... fastening member.

Claims (8)

A first elongate U-shaped member in which side wall portions are erected parallel to each other on both sides of the bottom wall portion;
A second elongate U-shaped member extending on the first elongate U-shaped member and having side wall portions erected in parallel with each other on both sides of the bottom wall portion;
It consists of an elastic member made of an elastic body,
The inner surface of the first elongate U-shaped member and the inner surface of the second elongate U-shaped member are opposed to each other, and the bottom wall portions are arranged in parallel to each other, and the elastic member is disposed in the first elongate U-shaped member. A soundproof structure for a building, which is assembled by being sandwiched between a bottom wall portion of a U-shaped member and a bottom wall portion of the second long U-shaped member.   The soundproof structure for a building according to claim 1, wherein the width of the bottom wall portion of the first long U-shaped member is wider than the width of the bottom wall portion of the second long U-shaped member.   The hollow portion is formed in the elastic member along the longitudinal direction of the first long U-shaped member and the second long U-shaped member. Soundproof structure. It is a soundproof structure of the building as described in any one of Claims 1-3, Comprising: The some soundproof structure arrange | positioned so that the bottom wall part of said 1st long U-shaped member may turn down Body,
A plywood placed on the bottom wall of the second long U-shaped member;
It consists of a finishing material arranged above the plywood,
The floor structure, wherein the plywood is fixed to the second long U-shaped member by a fastening member, and the first long U-shaped member is fixed to a floor base by a fastening member. A plate-like or mat-like interposition member having a specific gravity of 1.0 g / cm ³ or more is disposed between the plywood and the finishing material or between the plywood and the soundproof structure. The floor structure according to claim 4.   5. A plate-like member having a compressive strength equal to or higher than that of the plywood is disposed between the plywood and the finishing material or between the plywood and the soundproof structure. Item 6. The floor structure according to Item 5.   7. The vibration damping mat made of asphalt material is laid between the soundproof structures provided on the floor base at a distance from each other. 7. Floor structure as described in. A laminated member is laminated on the damping mat,
The floor structure according to claim 7, wherein a total height of the vibration damping mat and the laminated member is the same as a height of the soundproof structure.

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