JP7206870B2 - floor structure - Google Patents

Description

The present invention relates to floor construction.

Conventionally, for example, a double floor lower plate is fixed to the beam so as to cover the small beams and beams arranged to connect the beams, and the double floor upper plate is arranged on the double floor lower plate via a support spacer. A floor structure in which a sound absorbing material is provided in the space between the lower double floor plate and the upper double floor plate, and two sound insulation mats and a subfloor plate are provided on the upper double floor plate. , are known (see, for example, Patent Document 1).

JP 2015-10346 A

The sound insulation mats used in the above conventional floor structures are heavy because they are made of asphalt-based material. By increasing the weight of the sound insulation mats, the sound caused by the heavy impact source is less likely to reverberate. For this reason, although it satisfies the structural strength, the weight increases just to improve the sound insulation, and the use of not only sound insulation mats but also expensive sound absorbing materials increases the number of members and the construction process, which increases the cost. be.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a floor structure excellent in sound insulation while suppressing costs.

In order to achieve such an object, the floor structure of the present invention is
a structural floor;
an intermediate plate supported on the structural floor by a plurality of lower supports spaced apart from each other by a predetermined dimension;
an upper member supported on the intermediate plate by a plurality of upper support members spaced apart from each other by the predetermined dimension;
has
The upper support member is a floor structure arranged at an intermediate position between the lower support members adjacent to each other,
A damping means is provided for supporting the long-term load acting on the upper member by the yield strength of the elastic deformation range of the intermediate plate member, and damping the impact load acting on the upper member as the intermediate plate member elastically deforms. This is the floor structure.

According to such a floor structure, the upper support members supporting the upper members are arranged adjacent to each other on the intermediate plate members supported by the plurality of lower support members spaced apart by a predetermined dimension on the structural floor. Since it is arranged at an intermediate position between the lower support members that meet, when an impact load acts on the upper member, the intermediate plate member is pressed by the upper support member between the lower support members and elastically deforms downward. Therefore, the impact load acting on the upper member is not directly transmitted to the structural floor, so it is possible to reduce the propagation of sound to the lower floor. In addition, since this floor structure only supports the intermediate board with a plurality of lower support members on the structural floor and supports the upper member with a plurality of upper support members on the intermediate board, the number of members and the construction process are reduced. It is possible to keep costs down. Therefore, it is possible to provide a floor structure with excellent sound insulation while keeping costs down.
In addition, since the damping means is provided, the long-term load acting on the upper member is supported by the strength of the elastic deformation range of the intermediate plate member, and the impact load acting on the upper member is attenuated as the intermediate plate member elastically deforms. It is possible to attenuate vibrations due to shock loads such as walking vibration loads while supporting long-term loads such as furniture placed on the upper member.

In such a floor structure,
The damping means is provided at least one of the intermediate positions of the lower supporting members adjacent to each other and the intermediate positions of the upper supporting members adjacent to each other.

According to such a floor structure, the intermediate plate members are displaced the most when an impact load is applied to the upper member at the intermediate position between the lower supporting members adjacent to each other and the intermediate position between the upper supporting members adjacent to each other. Because of the position, it is possible to damp the vibration efficiently by the damping means. Therefore, vibration can be damped if at least one of the intermediate position of the lower support member and the intermediate position of the upper support member is provided with damping means.

In such a floor structure,
The damping means provided at the intermediate position of the lower support member has a projecting member fixed to the intermediate plate member, and powder laid on the structural floor in which the projecting member is partially embedded. It is characterized by

According to such a floor structure, when an impact load acts on the upper member, the projection member provided at the intermediate position of the adjacent lower support member is partially buried in the powder along with the displacement due to the bending of the intermediate plate member. Therefore, it is possible to attenuate the vibration by the friction between the protruding material and the powder.

In such a floor structure,
The damping means provided at the intermediate position of the upper support member includes a protruding member fixed to the upper member, and powder laid on the intermediate plate member in which the protruding member is partially embedded. characterized by having

According to such a floor structure, when an impact load acts on the upper member, the projecting member provided at the intermediate position of the upper support member adjacent to the upper member that descends due to the bending of the intermediate plate member will cause the upper member to descend. Since it is semi-embedded in the powder along with the projection, it is possible to attenuate the vibration due to the friction between the protrusion and the powder.

In such a floor structure,
The damping means is a damping member.
According to such a floor structure, it is possible to attenuate vibration simply by providing a damping member at an intermediate position between adjacent lower support members.

According to the present invention, it is possible to provide a floor structure excellent in sound insulation while suppressing costs.

It is a top view which shows the floor structure which concerns on this embodiment. It is a longitudinal section showing a floor structure concerning this embodiment. It is a longitudinal cross-sectional view explaining the effect of the floor structure which concerns on this embodiment. It is a longitudinal cross-sectional view showing a modification of the damping means. FIG. 10 is a plan view showing a modified example of the lower support member and the upper support member; 1 is a longitudinal sectional view showing a floor structure with fireproof performance; FIG.

The floor structure of the present invention will be described below with reference to the drawings.
In this embodiment, as shown in FIG. 1, a floor 2 formed inside pillars 1 provided at four corners will be described as an example. The four pillars 1 are arranged at positions where the interval between two pillars 1 adjacent in the depth direction is longer than the interval between two pillars 1 adjacent in the left-right direction.
A beam 3 is laid between the four pillars 1 adjacent to each other, and a wooden floor 4 as a structural floor is provided over the entire surface of the beam 3. - 特許庁

As shown in FIG. 2, the floor structure of this embodiment includes a wooden floor 4, an intermediate board 6 made of plywood supported by lower support members 5 on the wooden floor 4, and upper supports on the intermediate board 6. It has an upper member 8 made of plywood supported by a member 7 and a floor finishing member 10 provided on the upper member 8. - 特許庁That is, the space between the wooden floor 4 and the intermediate board 6 and between the intermediate board 6 and the upper board 8 is vertically separated by the lower support member 5 or the upper support member 7 .

Between the wooden floor 4 and the intermediate plate 6, and between the intermediate plate 6 and the upper member 8, the wooden structure A filling material 11 is provided to fill between the floor 4 and the intermediate plate member 6 and between the intermediate plate member 6 and the upper member 8. - 特許庁The floor structure of this embodiment is divided into a front side and a depth side at the center in the depth direction by the filling material 11 . As the filling material 11, for example, damping rubber is used.

In the area surrounded by the filling material 11 , three lower support members 5 made of rod-shaped wooden rectangular timbers are arranged along the depth direction on the wooden floor 4 . The three lower support members 5 are arranged side by side in parallel with each other in the left-right direction at a predetermined interval. Intermediate plate members 6 are attached on the three lower support members 5 .

Four upper support members 7 made of rod-shaped wooden squares are arranged along the depth direction on the intermediate plate member 6 . That is, an upper support member 7 is provided facing in the same direction as the lower support member 5 provided below the intermediate plate member 6 . The four upper support members 7 are arranged side by side in parallel with each other in the left-right direction at a predetermined interval. At this time, the predetermined distance between the lower support members 5 in the left-right direction and the predetermined distance between the upper support members 7 in the left-right direction are the same, and the upper support members 7 are placed adjacent to each other in the left-right direction. It is arranged at an intermediate position that is approximately central between the support members 5 . An upper member 8 is attached on the four upper support members 7 . Further, at this time, the intermediate plate member 6 made of plywood is arranged so that the fiber direction is along the left-right direction.

Between the intermediate plate 6 supported by the lower support member 5 and the wooden floor 4, and between the upper member 8 supported by the upper support member 7 and the intermediate plate 6, powder 12 such as silica sand, 13 are provided. The powders 12 and 13 are provided in the entire area surrounded by the filling material 11, and the powder 12 provided on the wooden floor 4 has a space S1 between it and the intermediate plate material 6. The powder 13 provided on the upper member 8 is provided with a space S2 between itself and the upper member 8 and has a predetermined depth.

Projection members 14 are provided on the lower surface 6a of the intermediate plate member 6 at positions where the upper support member 7 is provided on the upper surface 6b. The amount of downward protrusion of the projection member 14 is smaller than the height of the lower support member 5, and an inclined portion 14a is provided at the lower end portion, the width of which in the left-right direction narrows toward the tip.

A projecting member 15 is provided on the lower surface 8a of the upper member 8 so as to be positioned directly above the position where the lower supporting member 5 is provided. The amount of downward protrusion of the projecting member 15 is smaller than the height of the upper supporting member 7, and an inclined portion 15a is provided at the lower end portion, the width of which in the left-right direction narrows toward the tip.

In the floor 2 of this embodiment, the lower support member 5 provided under the intermediate plate member 6 and the upper support member 7 provided above the intermediate plate member 6 are arranged so as to be shifted in the left-right direction. The intermediate plate member 6 elastically deforms and functions as a plate spring. Specifically, a vertical load applied over a long period of time, such as when furniture is placed on the floor 2, is supported by the strength of the elastic deformation range of the intermediate plate 6, and when an impact load such as walking vibration is applied, The intermediate plate member 6 is configured to be elastically deformable.

As shown in FIG. 3, due to the elastic deformation of the intermediate plate member 6, the intermediate plate member 6 between the portions supported by the lower support member 5 bends downward, and at the intermediate position where it bends downward the most. The upper member 8 supported by the upper support member 7 descends. At this time, the protruding member 14 provided on the intermediate plate member 6 is penetrated (semi-embedded) into the powder 12 on the wooden floor 4, and the protruding member 15 provided on the upper member 8 is inserted into the powder on the intermediate plate member 6. The powder 13 is penetrated (semi-embedded) in the body 13 , and the powder 13 on the intermediate plate member 6 is swung by the vibration of the intermediate plate member 6 .

At this time, when the protrusions 14 and 15 penetrate into the powders 12 and 13, resistance due to friction occurs, so that the soft feeling of the floor 2 due to the deformation of the intermediate plate member 6 is improved. At the lower ends of the projecting members 14 and 15, sloped portions 14a and 15a that narrow in width toward the tip are provided. 12 and 13 collapse into the depression in the center and easily return to their original state. Here, the lower end portions of the projecting members 14 and 15 are not limited to the inclined portions 14a and 15a, and may be, for example, a hemispherical surface protruding downward.

Further, the oscillation of the powders 12 and 13 itself exerts a damping effect, and the gap between the powders 12 and 13 can also be expected to have a sound absorbing effect. Furthermore, vibration of the powders 12 and 13 by sound waves also exerts a sound damping effect.

In order to achieve such a damping effect, the amount of downward protrusion of the projecting members 14 and 15 is such that when the intermediate plate member 6 supported by the lower support member 5 is bent, the lower ends of the projecting members 14 and 15 will be in contact with the wooden floor. 4 or the amount of protrusion that does not come into contact with the intermediate plate member 6, and the depth of the powders 12 and 13 is such that when the intermediate plate member 6 is flexed, the intermediate plate member 6 and the upper member 8 come into contact with the powders 12 and 13. Not set to depth. In this embodiment, the powders 12 and 13 and the projecting members 14 and 15 that are relatively displaced with the elastic deformation of the intermediate plate member 6 correspond to the damping means 16 .

According to the floor structure of this embodiment, the upper member 8 is supported on the intermediate plate member 6 supported by a plurality of lower support members 5 spaced apart by a predetermined dimension on the wooden floor 4. Since the support member 7 is arranged at the intermediate position of the lower support member 5, when an impact load acts on the upper member 8, the intermediate plate member 6 is pressed by the upper support member 7 between the lower support members 5, and bends downward. elastically deformed. Therefore, the impact load acting on the upper member 8 is not directly transmitted to the wooden floor 4, so that it is possible to reduce the propagation of sound to the lower floor.

Further, between the wooden floor 4 and the intermediate plate 6, there are protruding members 14 fixed to the intermediate plate 6, and powder 12 laid on the wooden floor 4 and having the protruding members 14 semi-buried. Since the means 16 is provided, when an impact load acts on the upper member 8, the projecting member 14 provided at the intermediate position between the adjacent lower supporting members 5 is displaced by the bending of the intermediate plate member 6, causing powder to fall. Semi-embedded in body 12 . Further, between the intermediate plate member 6 and the upper member 8, there is a projection member 15 fixed to the upper member 8, and a powder 13 laid on the intermediate plate member 6 and in which the protrusion member 15 is semi-buried. Since the means 16 is provided, when an impact load is applied to the upper member 8, the projection member 15 provided at the intermediate position between the adjacent upper support members 7 of the upper member 8 which is lowered due to the bending of the intermediate plate member 6. are semi-buried in the powder 13 as the upper member 8 descends. Therefore, both between the wooden floor 4 and the intermediate plate member 6 and between the intermediate plate member 6 and the upper member 8, vibration is damped by the friction between the projecting members 14, 15 and the powders 12, 13. It is possible.

In addition, the damping means 16 supports the long-term load acting on the upper member 8 by the proof stress of the elastic deformation range of the intermediate plate member 6, and damps the impact load acting on the upper member 8 by damping the elastic deformation of the intermediate plate member 6. Therefore, it is possible to attenuate vibration caused by an impact load such as a walking vibration load while supporting a long-term load such as furniture placed on the upper member 8 .

In the above-described embodiment, as the damping means 16, projection members 14 and 15 provided at intermediate positions between the lower support member 5 and the upper support member 7 adjacent to each other, and powder laid on the wooden floor 4 and the intermediate plate member 6 Although an example configured by 12 and 13 has been described, the present invention is not limited to this. For example, as shown in FIG. 4, the damping means 16 connects the wooden floor 4 and the intermediate board 6 or the intermediate board 6 and the upper board 8 at the intermediate position between the lower support member 5 and the upper support member 7 which are adjacent to each other. For example, a damping member 17 such as a viscous body or a viscoelastic body may be provided.

In the above embodiment, an example in which the damping means 16 is provided both between the wooden floor 4 and the intermediate plate 6 and between the intermediate plate 6 and the upper member 8 has been described. It is not limited and may be provided in only one of them. Also, the damping means may not necessarily be provided.

In this case, the upper support member 7 supporting the upper member 8 is placed on the intermediate plate member 6 supported by a plurality of lower support members 5 spaced apart by a predetermined distance on the wooden floor 4. Since it is arranged at the intermediate position of the lower support member 5, when an impact load acts on the upper member 8, the intermediate plate member 6 is pressed by the upper support member 7 between the lower support members 5 and elastically deforms downward. Therefore, the impact load acting on the upper member 8 is not directly transmitted to the wooden floor 4, so that it is possible to reduce the propagation of sound to the lower floor. In addition, in this floor structure, the intermediate plate members 6 are supported on the wooden floor 4 by a plurality of lower support members 5, and the upper members 8 are supported on the intermediate plate members 6 by a plurality of upper support members 7. It is possible to keep the cost down by keeping the number of parts and construction steps to a minimum. Therefore, it is possible to provide a floor structure with excellent sound insulation while keeping costs down.

When the damping means 16 is not provided as in the above embodiment, the natural vibration of the intermediate plate member 6 is preferably set to 63 Hz or less. The human audible range is about 20 Hz to 15000 Hz, and the sound from a weight impact source is about 30 Hz to 200 Hz. Therefore, by setting the natural vibration of the intermediate plate member 6 to 30 Hz or less, it is possible to suppress the resonance of the intermediate plate member 6 and attenuate the vibration caused by the impact load.

ここで、 ｆ：1次固有振動数
L：根太スパン
E：板ばねのヤング係数
I：板ばねの断面2次モーメント
W：支持重量＋自重 In order to attenuate the vibration, it is effective to remove the natural vibration of the intermediate plate member 6 from the resonance region of the vibration of the impact load. For example, the natural frequency of a leaf spring (fixed-ends beam) system is given by equation (1).

where, f: 1st natural frequency
L: Joist span
E: Young's modulus of leaf spring
I: Geometric moment of inertia of leaf spring
W: supporting weight + own weight

From the formula (1), it is confirmed that the leaf spring has the effect of reducing the response at frequencies equal to or greater than √2 times the primary natural frequency of the spring. Therefore, for the primary natural vibration of 30 Hz, if the natural frequency of the intermediate plate member 6 is set to 30/√2=21 (Hz) or less, the intermediate plate member 6 functioning as a leaf spring alone can reduce the effect. It is possible to obtain

In the above-described embodiment, the plurality of lower support members 5 provided on the wooden floor 4 and the upper support members 7 provided on the intermediate plate members 6 are both rod-shaped wooden squares. Although an example in which they are arranged along the direction has been described, the present invention is not limited to this. For example, as shown in FIG. 5, a cube-shaped wooden lower support member 5a and an upper support member 7a are arranged in the depth direction and the left-right direction at predetermined intervals. The upper support member 7a may be arranged at an intermediate position between the lower support members 5a adjacent to each other in the left-right direction.

When fire resistance is required for the floor structure, as shown in FIG. It is desirable to use lower support member 5 and upper support member 7 made of a material that is resistant to heat or flame. At this time, a fireproof board may be used instead of the upper member.

Moreover, in the above-described embodiment, an example using the wooden intermediate board 6 has been described, but the present invention is not limited to this. For example, instead of the wooden intermediate plate 6, a high-strength fiber-reinforced concrete material made by mixing ultra-high-strength steel fibers with ultra-high-strength mortar, for example, the product name "Slimcrete" (registered trademark) manufactured by Obayashi Corporation is used. I don't mind. Since the high-strength fiber-reinforced concrete material is a precast concrete material, it is possible to integrally form the intermediate plate, the lower support member, and the upper plate, and is excellent in workability.

As described above, the above-described embodiments are intended to facilitate understanding of the present invention, and are not intended to limit and interpret the present invention. The present invention can be modified and improved without departing from its spirit, and it goes without saying that the present invention includes equivalents thereof.

2 floor, 4 wooden floor (structural floor), 5 lower supporting member, 5a lower supporting member, 6 intermediate plate, 7 upper supporting member,
7a upper supporting member, 8 upper member, 12 powder, 13 powder, 14 protruding member, 15 protruding member,
16 damping means, 17 damping rubber (damping material),

Claims (5)

a structural floor;
an intermediate plate supported on the structural floor by a plurality of lower supports spaced apart from each other by a predetermined dimension;
an upper member supported on the intermediate plate by a plurality of upper support members spaced apart from each other by the predetermined dimension;
has
The upper support member is a floor structure arranged at an intermediate position between the lower support members adjacent to each other,
A damping means is provided for supporting the long-term load acting on the upper member by the yield strength of the elastic deformation range of the intermediate plate member, and damping the impact load acting on the upper member as the intermediate plate member elastically deforms. and floor structure. The floor structure according to claim 1 ,
The floor structure, wherein the damping means is provided at least one of the intermediate positions of the lower support members adjacent to each other and the intermediate positions of the upper support members adjacent to each other. . The floor structure according to claim 2 ,
The damping means provided at the intermediate position of the lower support member has a projecting member fixed to the intermediate plate member, and powder laid on the structural floor in which the projecting member is partially embedded. A floor structure characterized by: The floor structure according to claim 2 ,
The damping means provided at the intermediate position of the upper support member includes a protruding member fixed to the upper member, and powder laid on the intermediate plate member in which the protruding member is partially embedded. A floor structure characterized by having: The floor structure according to claim 2 ,
The floor structure, wherein the damping means is a damping member.

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