JP5711453B2 - Support leg and dry sound insulation double floor structure using the same - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a dry sound insulation double floor structure that is excellent in sound insulation effect and does not impair the feeling of walking by devising the shape of a cushion member of a support leg in a dry double floor used in an apartment house or the like. .

  Conventionally, a floor floor made of plywood or particle board is supported on a floor slab surface made of concrete or the like via a support leg to form a double floor surface, and floor base material such as plywood is discarded on top of that. A double-floor structure is used, with decorative finishing materials such as wooden flooring.

  This type of double floor structure can absorb unevenness of the floor slab surface with the support legs, so that there is no need for smoothing the floor slab surface and wiring and piping work in the underfloor space is easy.

  For example, according to Japanese Patent Application Laid-Open No. 11-293897, a base material 55 and a floor material 56 are supported on a floor slab surface 60 via a floor support 50 as shown in FIG. The cushion member 51 is provided with four grounding portions 52 on the contact surface with the floor slab surface 60 in the form shown in FIG.

  By providing the grounding portion 52 in this manner, since the ground contact area with the floor slab surface 60 is reduced, it is possible to improve the sound insulation against the impact sound transmitted to the floor, particularly the lightweight floor impact sound.

JP-A-11-293897

  On the other hand, it is effective to lower the rubber hardness of the elastic body used for the cushion member 51 in order to insulate the floor impact sound. However, since it is easy to deform, the grounding portions 52 provided around the four sides as shown in FIG. If a space is formed between the two, the bottom surface of the cushion member 51 is pushed by the support column 53 to be deformed and contact the floor slab surface 60 against the heavy floor impact, thereby deteriorating the sound insulation performance against the heavy floor impact sound. It was. In addition, there is a problem that the feeling of walking is lost when the user walks.

  The present invention has been made in view of such a problem, and by devising the shape of the elastic body used for the cushion member of the support leg, even if the rubber hardness of the elastic body is lowered, the sound insulation performance against the heavy floor impact sound is achieved. An object of the present invention is to provide a dry sound insulation double floor structure that does not deteriorate and does not impair the feeling of walking.

In order to solve the above-described object, the invention of the support leg according to claim 1 is screwed into a cushion member made of an elastic body, a support column standing at the upper center of the cushion member, and an upper portion of the support column. Ri Do and a receiving plate, the support legs that will be erected on the floor slab surface, the cushion member includes a base that is post insertion portion is formed and a lower surface for inserting the post in the center of the top surface is a plane And a cavity opened at the bottom surface of the base is formed in the lower part of the central part of the base, and moves to the floor slab surface side by an impact from the support between the cavity and the support insertion part. in conjunction with thin wall portion deformable in the shearing direction is provided, around except the opening of the cavity at the base lower surface, the base portion circumferentially continuous in a donut shape and cross-section along the base radially semicircular It is characterized by providing a protrusion

  The invention of the support leg according to claim 2 is characterized in that, in the support leg according to claim 1, the diameter of the cavity in the plane direction is substantially equal to the diameter of the column insertion portion in the plane direction.

  According to a third aspect of the invention, there is provided a dry sound insulation double floor structure in which a plurality of support legs according to claim 1 or 2 are erected on a floor slab surface, and a highly rigid floor is formed across the receiving plates of the plurality of support legs. A panel is laid.

Invention, Ri Do from the backing plate to be screwed to the top of the column and struts which are erected on the top center of the cushion member and the cushion member made of an elastic body, erected on the floor slab surface according to claim 1 the support legs that will be, the cushion member has a base strut insertion portion at the center portion is formed and the lower surface is the plane of the upper surface, the lower portion of the central portion of its base, a cavity which is open to the base lower surface A thin-walled portion that is formed and deformable in a shearing direction so as to move to the floor slab surface side by an impact from the column is provided between the cavity and the column insertion portion, and the cavity is formed on the lower surface of the base portion. transmitted to the surroundings except for the opening, since the base portion circumferentially continuous in a donut shape and cross-section along the base radial direction are provided semicircular projections, the floor slab surface through direct cushion member vibration posts To prevent Rutotomoni thin portion is provided at the base of the cushion member directly under the strut, the thin portion deforms in shear direction can absorb shock when the shock is applied. In addition, the contact area between the cushion member and the floor slab surface is reduced, so that the impact transmitted from the floor surface through the support leg is reduced, and the sound insulation characteristic against particularly light floor impact sound is improved.

  In the invention according to claim 2, in the support leg according to claim 1, since the diameter of the cavity in the planar direction at the base part of the cushion member is substantially equal to the diameter in the planar direction of the column insertion part, a weight impact is applied. Even if the thin part of the cushion member directly below the support column is compressed, the thin part is deformed and comes into contact with the floor slab surface. Can be prevented.

  The invention according to claim 3 is an invention of a dry sound insulation double floor structure using the support leg according to claim 1 or 2, wherein a high-rigidity floor panel is laid over the receiving plates of the plurality of support legs. Therefore, it is possible to provide a comfortable walking feeling without sinking of the floor surface by reducing the deflection of the floor surface during walking.

Sectional drawing of the support leg which concerns on embodiment of this invention. The rear view and end elevation which show the Example of the cushion member of this invention. Rear and end views showing a reference example of cushions members. Rear and end views showing a reference example of cushions members. Rear and end views showing a comparative example of cushions members. Sectional drawing which shows embodiment of the dry-type sound insulation double floor structure of this invention. Sectional view showing another embodiment of a dry sound insulation double floor structure of the present invention. The fragmentary sectional view of the dry-type sound insulation double floor structure of a prior art. The rear view of the support leg of a prior art.

  Embodiments of the present invention will be described below with reference to FIGS. Of course, the present invention is not limited to the description of the present embodiment.

As shown in FIG. 1, a support leg 10 according to an embodiment of the present invention includes a cushion member 11 made of an elastic body such as natural rubber, synthetic rubber, and synthetic resin, and an alloy such as steel, titanium alloy, aluminum alloy, and stainless steel. It is comprised with the support | pillar 12 which consists of support | pillar 12 which consists of a resin, and wood materials, such as a plywood and a particle board, and a resin board. A screw thread is formed on at least the upper part of the support column 12 (usually the entire support column). A nut member 14 made of metal or resin is screwed into the screw thread, and the nut member 14 is fixed to the receiving plate 13. The support plate 13 can be supported so that its height can be adjusted.

The base 11a of the cushion member 11 is a cylindrical portion whose lower surface is represented by a broken line. A hollow portion 11c is formed in the lower portion of the base portion 11a, so that a thin portion 11d is formed between the base portion 11a and the column insertion portion 11e. The diameter of the column insertion part 11e is set to be equal to or slightly larger than the diameter of the column 12, and a retaining projection 11f is provided in the interior so that the column 12 does not come off the cushion member 11. A protrusion 11b is provided around the lower surface of the base 11a. A comparative example of a rear view and an end view showing the positional relationship between the cavity 11c and the protrusion 11b is shown in FIG. 5, an example in FIG. 2 , and a reference example in FIGS .

  In FIG. 5, hemispherical protrusions 11 b are arranged in a cross shape at five places on the center and the periphery on the lower surface of the base 11 a, and the support leg 10 is in contact with the floor slab surface 60 at the top of the five protrusions 11 b. Therefore, the impact transmitted from the floor surface (the floor finish surface of the double floor) downward through the support leg 10 is absorbed in the elastic body, and the amount of transmission is less than that of grounding on the entire lower surface of the cylindrical cushion member 11. Although it is reduced, the sound insulation effect is insufficient because the vibration from the column 12 is directly transmitted to the protrusion 11b disposed at the center of the lower surface of the base below the column 12.

On the other hand, as shown in FIG. 3, in the reference example , hemispherical protrusions 11b are arranged circumferentially around the lower surface of the base 11a, and are in contact with the slab at the eight apexes. The impact transmitted downward through the support leg 10 from the floor finish of the double floor is absorbed in the elastic body, and the amount of transmission to the floor slab surface 60 is reduced. Further, the thin part 11d formed by providing the cavity 11c at the center lower part of the base part 11a is easily deformed in the shearing direction when an impact is applied, so that the impact can be easily absorbed. Improves sound insulation characteristics against lightweight floor impact sound when dropping or pulling a chair. The rubber hardness of the elastic body is preferably soft, and about 70 degrees is an appropriate rubber hardness. Further, the thickness of the thin portion 11d is preferably about 10 to 30% of the base portion 11a from the balance between deformation and strength.

FIG. 4 is based on another reference example , which is basically the same as the reference example , so only the differences will be described. The diameter D of the cavity 11c and the diameter d of the column insertion portion 11d are D> d in FIG. 3, but in this reference example , D≈d (substantially equivalent: a difference of about 20% of the diameter is considered to be substantially equivalent. It is. According to this, dropped or heavy floor, when the weight impacts such time the child was jumping applied, deformation of the thin portion 11d even strut 12 compresses the thin portion 11d of the elastic body just below the It is suppressed and is not deformed until it comes into contact with the floor slab surface 60, and the generation of heavy floor impact sound (especially the frequency is 125 Hz) can be prevented.

FIG. 2 is based on the Example of this invention, and the difference with FIG. 4 is a point which has the shape which the protrusion 11b did not isolate | separate like FIG. 4, but continued in donut shape. As a result, the soundproof performance is not greatly changed, but the deformation of the entire protrusion 11b is suppressed by the increase in the ground contact area of the protrusion 11b, the amount of deformation is reduced, and the sinking of the supported double floor surface is suppressed. The feeling of walking is improved without fluffing when walking.

  FIG. 6 is a cross-sectional view showing an example of a dry sound insulation double floor structure using the support legs 10 described above. A plurality of support legs 10 are erected on the floor slab surface 60 to support a high-rigidity floor panel 21 across a plurality of receiving plates 13 to form a double floor surface, and the floor base material 22 is discarded thereon. Further, the floor finishing material 23 is stretched up and the dry sound insulation double floor structure is completed. A joist 17 made of wood is provided on the four circumferential portions along the wall 61, and the joint portion of the floor panel is supported by the support legs 10. As the floor panel 21, a plywood, a particle board, a volcanic glassy multilayer board, a wood cement board, or the like can be used, and the size is preferably 450 to 1000 × 450 to 2000 and the thickness is preferably about 15 to 30 mm.

  When the installation of the floor panel 21 is completed, the receiving plate 13 is moved up and down by turning the screw portion at the head of the support column 12 of the support leg 10 through the gap between the floor panels 21 and adjusted so that the floor panel 21 is horizontal. The material 22 is thrown away so that the gaps do not overlap. The floor base material 22 can be the same as the floor panel 21. If necessary, a sound insulating mat or the like may be laid on the top. Finally, floor finishing material 23 such as wooden flooring is lifted up.

If the floor panel 21 is made of a material having high rigidity (high bending strength), the double floor surface can be prevented from being bent and partial sinking can be suppressed. Eliminates the feeling of walking. Ordinary bending strength in the present embodiment to improve the approximately 30% strength from particle board of 18N / mm ² to 23N / mm ^2, improved from ΔLL-2 in DerutaLL-3 in light floor impact sound level Yes.

  FIG. 7 is a cross-sectional view showing another example of the dry type sound insulation double floor structure. Since the parts other than the joist are basically the same as the structure shown in FIG. 6, differences will be described. The sound insulation can be enhanced by using joists when the cushion member made of an elastic body is provided in the four circumferential portions along the wall 61 in the same manner as the support legs 10. In addition, a dry sound insulation double floor structure having further excellent sound insulation can be obtained by providing a sound absorbing material (glass wool mat, rock wool mat, etc.) between the floor panel 21 and the floor slab surface 60 as necessary. .

  In dry double floors used in apartment houses, etc., by devising the shape of the cushion member of the support leg, it is possible to provide a dry sound insulation double floor structure that can simultaneously enhance both the sound insulation effect and the feeling of walking, It is extremely useful and has high industrial applicability.

DESCRIPTION OF SYMBOLS 10 Support leg 11 Cushion member 11a Base part 11b Protrusion part 11c Cavity 11d Thin-walled part 11e Support | pillar insertion part 11f Retaining prevention protrusion 12 Support | pillar 13 Base plate 21 Floor panel 22 Floor base material 23 Floor finish material 60 Floor slab surface

Claims (3)

A cushion member made of an elastic body, a post that is erected on the top center of the cushion member, Ri Do from the backing plate to be screwed to the top of the support posts, the support legs that will be erected on the floor slab surface,
The cushion member has a base portion in which a column insertion portion for inserting the column is formed at the center of the upper surface and the lower surface is a plane.
A cavity opening in the lower surface of the base is formed in the lower part of the central part of the base, and between the cavity and the support insertion part, in a shear direction so as to move to the floor slab surface side due to an impact from the support. A deformable thin part is provided,
Around the base lower surface, except an opening of the cavity, the support legs, characterized in that the base circumferentially continuous in a donut shape and cross-section along the base radial direction is provided a semicircular protrusion. The support leg according to claim 1,
The support leg according to claim 1, wherein a diameter of the cavity in a plane direction is substantially equal to a diameter of the column insertion portion in the plane direction.   A dry-type sound insulation double comprising a plurality of support legs according to claim 1 or 2 erected on a floor slab surface, and a high-rigidity floor panel laid across the receiving plates of the plurality of support legs. Floor structure.

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