JP5128969B2 - Floor support vibration absorber and floor structure - Google Patents

Description

  The present invention relates to a floor-supported vibration absorber that supports a floor material of a double floor, and a floor structure using the floor-supported vibration absorber.

  In the floor structure, there is a case where a double floor structure is provided in which a floor is provided at a predetermined height from the floor base via a support member in order to improve the performance of blocking floor impact sound. In such a double floor structure, for example, as disclosed in Patent Document 1, a technique for attenuating vibration from a floor using an elastic body and a mass body is disclosed.

According to the floor structure described in Patent Document 1, vibration from the floor can be effectively damped. However, in the floor support of Patent Document 1, since the first elastic member and the second elastic member are arranged in series, the height of the floor support becomes high, and there is a limit to dealing with a low floor. .
JP 2007-04-0093 A

  The present invention has been made in consideration of the above-described facts, and provides a floor support vibration absorber and a floor structure that can be applied to a low floor while improving the performance of blocking floor impact sound. Is an issue.

The floor-supporting vibration absorber of the present invention described in claim 1 is supported on a floor slab, is elastically deformable and damps vibrations, is supported on the first elastic member, and the floor A supporting member for supporting a flooring disposed with a gap between the slab and a position spaced apart from the supporting member, and attached to the lower surface of the flooring at a distance from the flooring along the flooring. An elastically deformable beam member, and a mass body attached to the beam member and displaced by elastic deformation of the beam member to attenuate the vibration.

  According to the floor supporting vibration absorber described in claim 1, when vibration is applied to the flooring material, this vibration is transmitted to the beam member. As a result, the beam member is elastically deformed so that the mass body moves up and down so as to absorb the vibration, whereby the vibration of the flooring material is attenuated, and as a result, the vibration to the floor slab is attenuated. The damped vibration is further damped by the first elastic member and transmitted to the floor slab, so that the floor impact sound is well cut off.

  Further, since the beam member is attached to the lower surface of the flooring at a position separated from the support member, the beam member and the first elastic member can be arranged in parallel, and the height of the floor support vibration absorber is increased. Can be lowered.

  Further, since the beam member is used, the spring constant can be easily adjusted by changing the thickness, width, support span, and the like of the beam member.

The floor supporting vibration absorber according to claim 2, wherein the beam member is supported on the lower surface of the floor material by a first support portion on one end side and a second support portion on the other end side, and an intermediate portion of the beam member The mass body is attached to the main body.

  With the above configuration, the beam member and the mass body can be attached with a simple configuration, and the spring constant can be easily adjusted by changing the distance between the first support portion and the second support portion. .

  The floor supporting vibration damping device according to claim 3, wherein the mass body is attached to a lower side of the beam member, and a damping member capable of viscoelastic deformation is disposed between the beam member and the floor material. It is characterized by.

  As described above, by arranging the damping member, the vibration of the beam member due to the displacement of the mass body can be quickly attenuated, and the resonance peak becomes gentle and the target range of the vibration frequency of the flooring can be expanded. .

  The floor structure described in claim 4 is provided with a floor slab, a floor material arranged with an interval from the floor slab, and the floor support vibration absorber according to any one of claims 1 to 3. .

  According to the floor structure of the present invention, even when the distance between the floor slab and the flooring is short, the floor impact sound can be satisfactorily blocked by the floor support vibration absorber.

  As described above, according to the floor supporting vibration absorbing device and the floor structure of the present invention, the floor impact sound blocking performance can be improved and applied to a low floor.

  [First Embodiment]

  An embodiment of a floor support vibration absorber according to the present invention and a floor structure to which the floor support vibration absorber is applied will be described with reference to the drawings. In addition, arrow UP in a figure shows the upward direction in a floor structure.

  A floor structure 10 shown in FIG. 1 is a double floor (dry sound insulation double floor) structure mainly used in an apartment house, and a floor impact sound (walking sound, object) that is emitted from the upper floor and propagates downward. This is a structure for reducing falling sounds of children, jumping of children, and the like.

  (Floor structure and floor support vibration absorber configuration)

  As shown in FIG. 1, a floor structure 10 includes a floor support 16 arranged in a plurality at a predetermined interval between a concrete floor slab 12 and an upper floor material 14 serving as a frame, and a dynamic vibration absorber. The sound absorber 30 is interposed, and a space is formed between the floor slab 12 and the upper floor material 14 by the floor support dynamic vibration absorber 28 including the floor support 16 and the dynamic vibration absorber 30. Is in a state of getting.

Note that the upper flooring 14 of the present embodiment has a laminated structure in which a base panel 14A is provided, a scraping material 14B is provided on the base panel 14A, and a finishing material 14C is further provided thereon. Here, the upper floor material 14 (the base panel 14A and the stripping material 14B) excluding the finishing material 14C, the floor support 16, and the dynamic vibration absorber 30 are the floor base materials.
In addition, the discarding material 14B is not necessarily required, and may be configured without the discarding material 14B.

  FIG. 2 shows a layout of the base panel 14A, the floor support 16 and the dynamic vibration absorber 30. Each of the base panels 14A is laid so that a gap having a predetermined interval (hereinafter referred to as “joint M”) is formed. The joint M is provided with an interval of about 10 mm to 20 mm in order to prevent a squeaking noise caused by contact between the base panels 14A. The floor support 16 is disposed so as to straddle the joint M. As shown in FIG. 2 (A), the dynamic vibration absorber 30 may be arranged at a predetermined interval in the middle portion of the floor support 16 at the center portion in the short direction of the base panel 14A. As shown in FIG. 4, the both ends in the short direction may be arranged in the vicinity of the floor support 16 at a predetermined interval.

  As shown in FIG. 3, the floor support 16 includes a cushion rubber 18 as a first elastic member, a support bolt 22 as a support member, and a support panel 15.

  The cushion rubber 18 is disposed on the floor slab 12. The cushion rubber 18 has a cylindrical shape, and is supported on the floor slab 12 in order to attenuate the vibration from the upper floor material 14, and can be elastically deformed.

  On the cushion rubber 18, a support bolt 22 is supported in an upright state via an intermediate receiving member 20 as an intermediate receiving portion. The intermediate receiving member 20 has a cylindrical shape and is provided with a flange portion 20A in the intermediate portion. One side of the cylindrical portion is inserted into the cylinder inside of the cushion rubber 18 and is directed to the lower surface of the flange portion 20A (to the cushion rubber 18 side). Surface) is fixed to the upper surface of the cushion rubber 18 (the surface opposite to the surface on the floor slab 12 side). A female screw portion 20B is formed on the inner peripheral surface of the cylindrical portion of the intermediate receiving member 20, and a male screw portion 22A formed on the shaft portion of the support bolt 22 is screwed into the female screw portion 20B. Thereby, the intermediate receiving member 20 is integrated with the support bolt 22.

  Under the base panel 14A, a support panel 15 is disposed across the joint M at predetermined intervals so as to support the base panel 14A. The support panel 15 has a square plate shape, and an adjustment hole 15A is formed at the center.

  The support bolt 22 extends in the opposite direction to the cushion rubber 18, that is, in the direction opposite to the floor slab 12, and the upper end portion is attached to the adjustment hole 15 </ b> A of the support panel 15. The support bolts 22 are configured to support the upper flooring 14 via the support panel 15. The panel receiving member 24 includes a cylindrical cylindrical portion 24B and a flange portion 24A protruding outward from one opening of the cylindrical portion 24B. The cylindrical portion 24B of the panel receiving member 24 is inserted and fixed in the adjustment hole 15A of the support panel 15, and the upper surface (surface directed toward the upper flooring 14) of the flange portion 24A is the lower surface (floor slab) of the support panel 15. 12). A female screw portion 24C is formed on the inner peripheral surface of the cylindrical portion of the panel receiving member 24, and a male screw portion 22B formed on the shaft portion of the support bolt 22 is screwed into the female screw portion 24C. Thus, the upper flooring 14 is disposed with a space between the floor slab 12.

  A concave portion (not shown) for inserting a flathead screwdriver is formed at the tip of the support bolt 22, and in a state before the stripping material 14 </ b> B and the finishing material 14 </ b> C are laid on the base panel 14 </ b> A of the upper floor material 14. The height of the base panel 14A from the floor slab 12 can be adjusted by inserting a flathead screwdriver into a recess (not shown) of the support bolt 22 and rotating the support bolt 22.

  As shown in FIGS. 3 and 4, the dynamic vibration absorber 30 includes a beam member 32 and a mass body 40. The beam member 32 has a long plate shape and is elastically deformable. The beam member 32 can be made of a material such as FRP, steel, metal, wood, resin, or ceramic. The beam member 32 is disposed in a direction along the lower surface of the base panel 14A with a distance δ from the base panel 14A. The distance δ is set to a dimension equal to or greater than the vertical deformation amount of the mass body 40. Spacers 34 are respectively disposed on the upper surface on one end side and the upper surface on the other end side of the beam member 32. The spacer 34 secures a distance δ between the base panel 14 </ b> A and the beam member 32.

  The beam member 32 is attached to the base panel 14A by screwing the screw 37 into the base panel 14A from the lower side of the beam member 32 corresponding to the position where the spacer 34 is disposed. An attachment portion on one end side is a first support portion 36, and an attachment portion on the other end side is a second support portion 38. The distance L between the first support portion 36 and the second support portion 38 is set so that the dynamic vibration absorber 30 corresponds to the natural vibration frequency of the upper flooring 14. That is, it is determined by the design eigenvalue depending on the Young's modulus, width, thickness of the beam member 32, the mass of the mass body 40, and the distance L.

  A mass body 40 is disposed on the lower surface of the intermediate portion of the beam member 32. The mass body 40 has a rectangular parallelepiped shape, and is attached to the beam member 32 by screwing a screw 42 from above the beam member 32. If a material having a high specific gravity is used as the mass body 40, the mass body 40 can be configured compactly. The mass body 40 can be made of a material such as steel, metal, water, sand, ceramic, or resin. The mass body 40 moves up and down so as to absorb the vibration from the beam member 32, thereby damping the vibration from the upper floor material 14 to the floor slab. A predetermined clearance C is formed between the dynamic vibration absorber 30 and the floor slab 12, so that even when the mass body 40 vibrates up and down, its lower end does not come into contact with the floor slab 12. .

  (Function)

  Next, the operation of the above embodiment will be described.

  The vibration of floor impact sound (for example, walking sound) generated on the upper floor is transmitted from the upper floor material 14 to the cushion rubber 18 via the support panel 15, the support bolt 22, and the intermediate receiving member 20. It is transmitted to the floor slab 12 while being attenuated. At this time, the mass body 40 of the dynamic vibration absorber 30 vibrates in the vertical direction so as to cancel the vibration of the upper flooring 14 via the beam member 32 (see FIG. 4). Thereby, the vibration transmitted to the cushion rubber 18 is attenuated, and the vibration transmitted from the upper floor material 14 to the floor slab 12 can be reduced.

  In the present embodiment, since the dynamic vibration absorber 30 is disposed separately from the floor support 16, the floor vibration is reduced compared to the case where the dynamic vibration absorber 30 is disposed in series with the floor support 16. The height of the vibration absorber 28 can be reduced. Therefore, it can also be installed on a low floor where the distance between the lower surface of the upper flooring 14 and the floor slab 12 is short.

  Further, the beam member 32 of the present embodiment can be obtained by changing the Young's modulus, thickness, and width of the beam member 32, and by changing the distance L between the first support portion 36 and the second support portion 38. The spring constant can be easily changed. Therefore, the dynamic vibration absorber 30 can be adjusted to an effective reaction force against the impact on the upper flooring 14.

  In the present embodiment, the mass body 40 is disposed below the beam member 32, but the mass body 40 may be disposed above the beam member 32.

  [Second Embodiment]

  Next, a second embodiment of the present invention will be described. In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The floor structure 60 of the present embodiment is the same as that of the first embodiment except that the dynamic vibration absorber includes the damping member 50.

  The floor structure 60 of the present embodiment includes the floor support 16 and the dynamic vibration absorber 70.

  As shown in FIG. 5, the dynamic vibration absorber 70 includes a beam member 32, a mass body 40, and a damping member 50. The damping member 50 is disposed between the beam member 32 and the base panel 14 </ b> A, and one surface is bonded to the base panel 14 </ b> A and the other surface is bonded to the beam member 32. Any member can be used as the damping member 50 as long as it is viscoelastically deformed. For example, a hollow rubber member as shown in FIG. ), A solid rubber member as shown in FIG. 6A, a solid circular cross-section foam as shown in FIG. 6C, or a rectangular cross-section foam as shown in FIG. 6D. .

  Further, as the attenuation member, as shown in FIG. 7, an attenuation member 51 having a shape with a hollow R as viewed from the side can be used. In this case, the screw 42 is screwed from the lower side of the mass body 40.

  (Function)

  Next, the operation of the above embodiment will be described.

  The vibration of floor impact sound (for example, walking sound) generated on the upper floor is transmitted from the upper floor material 14 to the cushion rubber 18 via the support panel 15, the support bolt 22, and the intermediate receiving member 20. It is transmitted to the floor slab 12 while being attenuated. At this time, the mass body 40 of the dynamic vibration absorber 30 vibrates in the vertical direction so as to cancel the vibration of the upper flooring 14 via the beam member 32. At this time, since the attenuation member 50 is disposed, the target frequency range can be expanded. That is, as shown in FIG. 8, when the natural vibration frequency characteristic of the upper floor material 14 is represented by F0 in the graph, the beam member 32 and the mass body 40 (without a damping member) corresponding to this natural vibration frequency characteristic. When F is installed, frequency peaks are dispersed like F1 in the graph. Further, by providing the damping member 50, as indicated by F2 in the graph, the peak of F1 is removed, and vibration can be effectively damped.

It is sectional drawing which shows the longitudinal cross-section of the floor structure and floor support which concern on 1st Embodiment. It is a top view which shows arrangement | positioning of the ground panel of a floor structure and floor support dynamic vibration absorber which concern on 1st Embodiment. It is sectional drawing of the floor support tool and dynamic vibration absorber which concern on 1st Embodiment. It is operation | movement explanatory drawing of the dynamic vibration damper which concerns on 1st Embodiment. It is sectional drawing of the dynamic vibration damper which concerns on 2nd Embodiment. It is a figure which shows the example of the damping member of the dynamic vibration damper which concerns on 2nd Embodiment. It is sectional drawing of the modification of the dynamic vibration damper which concerns on 2nd Embodiment. It is a graph which shows the vibration frequency characteristic at the time of installing the natural vibration frequency characteristic of a flooring, and a dynamic vibration absorber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Floor structure 12 Floor slab 14A Ground panel 14 Upper floor material 16 Floor support 18 Cushion rubber 22 Support bolt 28 Floor support dynamic vibration absorber 30 Dynamic vibration absorber 32 Beam member 36 1st support part 38 2nd support part 40 Mass body 50 Damping Member 51 Damping member 60 Floor structure 70 Dynamic vibration absorber L Distance δ Distance

Claims (4)

A first elastic member supported on the floor slab and elastically deformable to damp vibrations;
A support member that is supported on the first elastic member and supports a flooring that is disposed with a gap between the floor slab;
An elastically deformable beam member attached to the lower surface of the flooring material along the flooring material at a distance from the support member and spaced from the flooring material;
A mass body attached to the beam member and displaced by elastic deformation of the beam member to damp vibrations;
A floor-supported vibration absorber. The beam member is supported on the lower surface of the flooring by a first support portion on one end side and a second support portion on the other end side, and the mass body is attached to an intermediate portion of the beam member. The floor-supporting vibration absorber according to claim 1, wherein   The mass body is attached to a lower side of the beam member, and a damping member capable of viscoelastic deformation is disposed between the beam member and the floor material. A floor-supporting vibration absorber according to claim 1. Floor slabs,
A flooring disposed at an interval from the floor slab;
The floor-supporting vibration absorber according to any one of claims 1 to 3,
With floor structure.

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