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JP-2026074559-A - floor structure

JP2026074559AJP 2026074559 AJP2026074559 AJP 2026074559AJP-2026074559-A

Abstract

[Problem] To provide a floor structure that can improve performance against heavy floor impact sound. [Solution] The floor structure 1, 101, 201 comprises a floor structural material 10, a floor material 20, a first elastic body 30 disposed on the upper surface of the floor structural material 10 and supporting the lower surface of the floor material 20, and dynamic vibration absorbers 40, 140, 240 disposed between the floor structural material 10 and the floor material 20 and suppressing vibrations of at least the floor material 20 in the vertical direction. The dynamic vibration absorbers 40, 140, 240 comprise a mass 41 disposed to be movable in the vertical direction relative to the floor structural material 10 and the floor material 20, a second elastic body 42, 242 disposed on the upper surface of the floor structural material 10 and supporting the mass 41, and vibration damping materials 43, 143, 243 disposed sandwiched between the floor material 20 and the mass 41, in contact with the lower surface of the floor material 20 and the upper surface of the mass 41, and disposed so as not to separate from the lower surface of the floor material 20 and the upper surface of the mass 41 when the floor material 20 is vibrating. [Selection Diagram] Figure 2

Inventors

  • 浅井 伸介
  • 山本 雄大
  • 高田 友和

Assignees

  • 住友理工株式会社

Dates

Publication Date
20260507
Application Date
20241021

Claims (14)

  1. Floor structural materials, A flooring material arranged with a gap between it and the upper surface of the aforementioned floor structural material, A first elastic body is positioned on the upper surface of the floor structural material and supports the lower surface of the floor material, The system includes a dynamic vibration absorber positioned between the floor structural material and the floor material, which suppresses vibrations of the floor material in at least the vertical direction, The aforementioned dynamic vibration absorber is The floor structural material and a mass arranged to be movable in the vertical direction relative to the floor material, A second elastic body is positioned on the upper surface of the floor structural material and supports the mass, A floor structure comprising: a vibration damping material positioned between the floor material and the mass, in contact with the lower surface of the floor material and the upper surface of the mass, and positioned so as not to move away from the lower surface of the floor material and the upper surface of the mass when the floor material is vibrating.
  2. The floor structure according to claim 1, wherein the vibration damping material is formed in a sheet shape, at least a portion of the upper surface of the vibration damping material is adhered to the lower surface of the floor material, and at least a portion of the lower surface of the vibration damping material is adhered to the upper surface of the mass.
  3. The floor structure according to claim 2, wherein the vibration damping material is formed in a sheet shape, the entire upper surface of the vibration damping material is adhered to the lower surface of the floor material, and the entire lower surface of the vibration damping material is adhered to the upper surface of the mass.
  4. The floor structure according to claim 1, wherein at least a portion of the vibration-damping material is arranged in a compressed state between the floor material and the mass when the floor material is not vibrating in the initial state.
  5. The floor structure according to claim 4, wherein the vibration damping material is formed in a sheet shape and is arranged in a compressed state between the floor material and the mass over its entire surface in an initial state when the floor material is not vibrating.
  6. The floor structure according to any one of claims 1 to 5, wherein the second elastic body is positioned between the upper surface of the floor structural material and the lower surface of the mass, and is configured to bias the mass upward.
  7. The floor structure according to claim 6, wherein the second elastic body is a spring member.
  8. The floor structure according to claim 7, wherein the spring member is a conical coil spring.
  9. The floor structure according to claim 6, wherein the second elastic body is configured such that its storage spring constant is small when the amount of compression is small, and large when the amount of compression is large.
  10. The absolute spring constant of the damping material is greater than the absolute spring constant of the second elastic body. and/or, The floor structure according to claim 6, wherein the loss coefficient of the vibration damping material is greater than the loss coefficient of the second elastic body.
  11. The floor structure according to any one of claims 1 to 5, wherein the second elastic body is formed of rubber or elastomer, is placed on the upper surface of the floor structural material, supports the lower surface of the floor material, and supports the mass at an intermediate position in the vertical direction.
  12. The floor structure according to claim 11, wherein the second elastic body is formed from the same material as the first elastic body.
  13. The second elastic body is A lower support portion located between the floor structural material and the mass, which supports the mass relative to the floor structural material, It comprises an upper support portion located between the flooring material and the mass, which supports the mass relative to the flooring material, The absolute spring constant of the damping material is greater than the absolute spring constant of the lower support portion of the second elastic body. and/or, The floor structure according to claim 11, wherein the loss coefficient of the vibration damping material is greater than the loss coefficient of the lower support portion of the second elastic body.
  14. The aforementioned floor structural material is formed of wood in at least part and is supported by columns or beams also made of wood. A floor structure for wooden buildings, according to any one of claims 1 to 5.

Description

This invention relates to a floor structure. In recent years, reducing the transmission of everyday noises from upper floors to lower floors has become increasingly important in wooden buildings. In particular, countermeasures against heavy floor impact sound (JIS A 1418-2:2019, JIS A 1419-2:2000) are crucial. Heavy floor impact sound is a dull, low-pitched sound transmitted to the floor below, such as a child jumping or a chair being lowered. However, implementing countermeasures against heavy floor impact sound is not as easy in wooden buildings as it is in reinforced concrete or steel-frame buildings. As a measure against heavy floor impact noise, increasing the mass of the floor is an effective method. However, in wooden buildings, supporting a floor with increased mass using columns and beams is not easy. Increasing the number of columns and beams makes it possible to support the increased floor mass. However, increasing the number of columns and beams increases construction costs. Furthermore, the increased building mass necessitates ground improvement work in soft ground, which also increases construction costs. Therefore, it is necessary to implement heavy floor impact noise countermeasures while suppressing the increase in floor mass. Patent Document 1 discloses a system in which a rigid plate and a pre-compressed damping member are arranged on the underside of the flooring material. When an impact force is applied to the flooring material, the rigid plate does not follow the vibration of the flooring material but remains in a fixed position. The damping member sandwiched between the rigid plate and the flooring material dampens the vibration of the flooring material. Patent documents 2 and 3 disclose the placement of a dynamic vibration absorber between the floor structural member (lower floor member) and the flooring material (upper floor member). The dynamic vibration absorber disclosed in patent documents 2 and 3 includes an elastic body that supports the flooring material relative to the floor structural member, and a mass (vibration-damping mass) supported by the elastic body. Therefore, when an impact force is applied to the flooring material, the vibration is transmitted to the mass via the elastic body, damping the vibrations of both the flooring material and the floor structural member. Japanese Patent Publication No. 2018-090976Patent No. 7291490Patent No. 7364461 This is a plan view of the floor structure in Embodiment 1.This is a cross-sectional view of the floor structure in Embodiment 1, and is a cross-sectional view taken along line II-II in Figure 1.This is a floor structure model in Embodiment 1.This figure shows the floor structure in Embodiment 1 immediately after the impact force of the heavy floor impact evaluation test has been applied.This diagram shows the floor structure after an impact force has been applied.This is a cross-sectional view of the floor structure in Embodiment 2.This is a plan view of the floor structure in Embodiment 3.This is a cross-sectional view of the floor structure in Embodiment 3, and is the cross-sectional view taken along line VIII-VIII in Figure 7. (Embodiment 1) 1. Overview of Floor Structures The floor structure is a floor structure for wooden buildings. The floor structure is particularly applicable to the floor structure of upper floors in wooden buildings. A wooden building is a building in which at least the structural members of the floor are made of wood. That is, the term "wooden building" is used in contrast to steel-frame buildings, concrete buildings, and steel-frame unit buildings. However, the floor structure can also be applied to the above-mentioned buildings other than wooden buildings. Here, wooden buildings include structures with timber frame construction, two-by-four construction, and combinations of timber frame construction and wall panels. In other words, in wooden buildings, structural members such as columns, beams, and wall panels, in addition to the floor, are primarily made of wood. However, the floor structure only needs to be primarily made of wood; it is also applicable even if the structural members of the columns, beams, and wall panels are not made of wood. Furthermore, the floor structure is primarily designed to reduce the transmission of everyday noises from the upper floor to the lower floor. In particular, it aims to reduce heavy floor impact noise (JIS A 1418-2:2019, JIS A 1419-2:2000) transmitted to the lower floor. Heavy floor impact noise is a dull, low-pitched sound transmitted to the floor below, such as a loud thud or bang when a child jumps or a chair is lowered. JIS A 1418-2:2019 specifies the measurement method for the sound insulation performance of floor impact noise in buildings. Tire impact sources and rubber ball impact sources are listed as standard weight impact sources. JIS A 1419-2:2000 specifies the evaluation of the impact sound insulation performance of building floors using grade cur