JP6374664B2 - Construction method of sound insulation floor structure - Google Patents

Description

  The present invention relates to a method for constructing a sound insulation floor structure focusing on weight impact sound insulation performance, a sound insulation floor structure, a floor panel body used in the sound insulation floor structure, and a building having a sound insulation floor structure.

  Patent Documents 1 to 6 and Non-Patent Document 1 are technologies that focus on the performance of blocking heavy impact sound in the technical field of floor structures.

  Patent Document 1 describes a sound insulation composite panel for floors. This sound insulation composite panel for floors is composed of a lightweight cellular concrete panel (hereinafter also referred to as “ALC panel”) constituting a floor of a steel building or a wooden building, and a plywood panel bonded to both sides thereof. The thickness of the ALC panel is 9 mm or more and less than 75 mm. The thickness of the plywood panel attached to one surface of the ALC panel is 6 mm to 15 mm, and the thickness of the plywood panel attached to the other surface is 2 mm to 12 mm.

  Patent Document 2 describes a lightweight floor slab having predetermined out-of-plane rigidity. This floor board is a metal plate sandwich floor slab, and has a core part and metal plate parts attached to the upper and lower surfaces of the core part. For the core, lightweight cellular concrete, lightweight concrete, or foamed resin is used. Moreover, a notch is formed in the width direction edge part of a core part, and the projection part which is not notched in the width direction edge part of a core part is inserted with respect to this notch. If this joining method is used, sound insulation can be improved.

  Patent Document 3 describes a floor slab that can reduce the thickness of the slab while ensuring excellent floor impact sound blocking performance. The floor slab spanned between the beams has a hanging wall attached to a precast concrete floorboard. The hanging wall protrudes below the lower surface of the floor board and is provided away from the beam. By providing the vertical wall, the floor slab is less likely to shake, and compared to a conventional floor slab having no vertical wall, the thickness of the slab can be reduced and the floor impact sound blocking performance is improved.

  Patent Document 4 describes a sound insulation floor structure that effectively reduces heavy floor impact sound. In this floor structure, the interval between the floor beams on which the floor panels are arranged is set to 400 mm to 600 mm. According to this setting, the floor beams are arranged more densely than usual, and the low-frequency vibration generated in the floor panel is dispersed and transmitted to the wall structure. Therefore, the vibration of the low frequency is received in a wide range of the wall. And since a vibration is radiated | emitted to the lower floor in the state disperse | distributed from the inner wall surface, a heavy impact sound reduces.

  Patent Document 5 describes a floor slab capable of improving the performance of blocking floor impact sound to the lower floor. The floor slab includes a flat plate portion and a convex portion protruding from the upper surface or the lower surface of the flat plate portion. In the floor slab, the slab thickness is designed so as to obtain a natural frequency at which a desired floor impact sound blocking performance to the downstairs is obtained.

  Patent Document 6 describes a panel floor structure suitable for improving sound insulation. This panel floor structure has a steel core material that connects an upper surface material and a lower surface material to form a space. And at least 1 or more, such as the length of the upper and lower surface material, width | variety, thickness, space | interval, the length of a core material, is adjusted, and the primary natural frequency of a whole vibration system is set to 15 Hz-45 Hz. Furthermore, the primary natural frequency of the partial vibration system in each of the upper and lower surface materials and the core material is set to 707 Hz to 20000 Hz.

  Non-Patent Document 1 describes a technique aimed at improving the performance of blocking heavy impact sound. This technology refers to a reinforcing structure of the ALC floor panel and a floor structure that can suitably improve the cutoff performance of heavy impact sound by selecting the beam interval as a parameter.

JP 2001-32435 A Japanese Patent No. 5275896 JP2013-44215A JP 2007-162247 A JP 2013-174069 A Patent 4880087

Research on improvement method of heavy floor impact sound insulation performance in steel frame ALC housing, Architectural Institute of Japan Proceedings Collection No. 496, pp. 15-21, 1997, Nihon University.

By the way, the cutoff performance of the heavy impact sound is related to the natural frequency of the floor structure (Patent Document 6). In order to increase the cutoff performance of the heavy impact sound, it is necessary to increase the natural frequency of the floor structure.
The natural frequency of the floor structure is greatly affected by the interval between the beams supporting the floor panel, and the natural frequency of the floor structure tends to increase as the beam interval decreases.

  However, the beam spacing may be set by a factor other than the natural frequency of the floor structure, and the degree of freedom in designing the beam spacing is small. Therefore, if the natural frequency of the floor structure is set to a target value or higher based on the beam spacing value that can be set, the number of members such as additional beams that make up the floor structure will increase, resulting in poor workability. is there.

  The present invention has been made in view of the above circumstances, and while suppressing the deterioration of the workability of the floor structure, the construction method of the sound insulation floor structure capable of improving the insulation performance of the weight impact sound of the floor structure, It aims at providing a sound insulation floor structure, a floor panel body, and a sound insulation floor structure building.

  According to one aspect of the present invention, an additional beam that divides a predetermined span into divided spans having equal beam intervals is disposed between main beams that are arranged in parallel with each other with a predetermined span, and the floor panel body extends across the divided spans. It is a construction method of the arranged sound insulation floor. This construction method uses the beam spacing to calculate the natural frequency of the panel main body included in the floor panel body, and when the natural frequency is equal to or higher than the lower limit natural frequency, Providing a stiffening portion that cooperates to define the cross-sectional performance of the floor panel body on the upper surface and / or the lower surface of the panel main body portion.

  In this construction method, the natural frequency of the panel main body is calculated, and the stiffening portion is provided on the upper surface and / or the lower surface of the panel main body when the natural frequency is equal to or higher than the lower limit natural frequency. According to these steps, if the natural frequency of the panel body is equal to or higher than the lower limit natural frequency, the target natural frequency can be satisfied without providing additional beams. Therefore, the deterioration of the workability of the floor structure due to the addition of additional beams is suppressed. And by providing a stiffening part in the panel body part, the natural frequency of the floor panel body formed by the panel body part and the stiffening part is increased to be higher than the target natural frequency. Can be improved.

  Further, in the step of providing the stiffening portion on the upper surface and / or the lower surface of the panel body portion, when the natural frequency is equal to or higher than the lower limit natural frequency and lower than the target natural frequency, the stiffening portion is It may be provided on the lower surface. According to this construction method, even if the natural frequency is less than the target natural frequency, the target natural frequency can be satisfied by providing the stiffening portion. Therefore, in the construction of the sound insulation floor, the target natural frequency required to satisfy the desired sound insulation performance can be satisfied by simple construction.

  Further, according to another aspect of the present invention, an additional beam for dividing a predetermined span into divided spans having equal beam intervals is disposed between main beams arranged in parallel with each other with a predetermined span, and the floor spans the divided spans. It is a construction method of a sound insulation floor where a panel body is arranged. This construction method uses the beam spacing to calculate the natural frequency of the panel body included in the floor panel body, and the natural frequency is equal to or higher than the lower limit natural frequency and lower than the target natural frequency. In the case where a stiffening portion for defining the cross-sectional performance of the floor panel body in cooperation with the panel main body portion is provided on the upper surface and / or lower surface of the panel main body portion, and the natural frequency is equal to or higher than the target natural frequency Providing a non-stiffening portion on the upper surface and / or the lower surface of the panel body so that the cross-sectional performance of the floor panel body is defined by the panel body.

  According to this construction method, even if the natural frequency is less than the target natural frequency, the target natural frequency can be satisfied by providing the stiffening portion. Therefore, in the construction of the sound insulation floor, the target natural frequency required to satisfy the desired sound insulation performance can be satisfied by simple construction. Further, when the natural frequency is equal to or higher than the target natural frequency, a non-stiffening portion is provided in the panel body, so that the floor meets the target natural frequency required to satisfy the desired sound insulation performance. A function different from the increase in rigidity of the floor panel body can be given to the panel body.

  The sound insulation floor structure according to another aspect of the present invention includes a main beam arranged parallel to each other with a predetermined span, and an additional beam arranged between the main beams and dividing the predetermined span into divided spans having equal beam intervals. The floor panel body is arranged across the divided spans, and the first natural frequency defined by the beam interval is equal to or greater than the target natural frequency, and the floor panel body is a second panel defined by the beam interval. Is provided on the surface of the panel body and the panel body in cooperation with the panel body to define the cross-sectional performance of the floor panel body. And a rigid portion.

  In this sound insulating floor structure, the floor panel body has a stiffening portion that defines the cross-sectional performance of the floor panel body in cooperation with the panel body portion and the panel body portion. And although the 2nd natural frequency prescribed | regulated by a beam space | interval is more than a lower limit natural frequency and less than a target natural frequency, the panel main-body part is provided with a stiffening part, The 1st of a floor panel body is provided. The natural frequency of is greater than or equal to the target natural frequency. According to such a structure, even if the natural frequency of the panel main body is less than the target natural frequency, if it is equal to or higher than the lower limit natural frequency, it is not necessary to provide an additional beam in order to shorten the predetermined span. Therefore, the deterioration of the workability of the floor structure due to the addition of additional beams is suppressed. And by providing a stiffening part in the panel body part, the natural frequency of the floor panel body formed by the panel body part and the stiffening part is increased to be higher than the target natural frequency. Can be improved.

  Further, in the floor panel body, the boundary position between the panel main body portion and the stiffening portion is in the vicinity of the neutral axis position in the thickness direction of the floor panel body. According to this structure, when an external force is applied to the floor panel body, the generation of shearing force is suppressed at the joint surface between the panel body and the stiffening portion, and the expansion and contraction deformation that occurs at the boundary portion is reduced. Therefore, damage to the boundary portion between the panel main body portion and the stiffening portion can be suppressed.

  The target natural frequency is 100 Hz, and the lower limit natural frequency is 40 Hz. According to these natural frequencies, the natural frequency of the sound insulation floor structure can be made different from the predetermined frequency of the heavy impact sound. Therefore, it is possible to suppress a decrease in sound insulation performance of the sound insulation floor structure due to resonance.

  The target natural frequency is 120 Hz, and the lower limit natural frequency is 40 Hz. According to these natural frequencies, the natural frequency of the sound insulation floor structure can be further varied from the predetermined frequency of the heavy impact sound. Therefore, it is possible to suppress a decrease in sound insulation performance of the sound insulation floor structure due to resonance.

  Further, the stiffening portion is provided on the lower surface of the panel main body portion. The lower surface of the panel body is a place that is not visible after construction. Therefore, since the stiffening portion is disposed at a position where the stiffening portion cannot be seen, the design can be improved.

  The lower surface of the panel body has a beam fixing region to which the main beam and the additional beam are attached, and a stiffening portion installation region to which the stiffening portion is fixed. The stiffening portion installation region is a beam fixing region. There is no overlap. According to this structure, the panel main body and the main beam and the panel main body and the additional beam are fixed in direct contact with each other, so that the main beam and the additional beam are preferably joined to the panel main body. Can do. Similarly, when the stiffening part is provided in the panel main body part, the main beam and the additional beam are not interfered with each other, and the stiffening part is fixed in a state of being in direct contact with the panel main body part. The stiffening part can be suitably joined to the main body part.

  The lower surface of the panel main body further has a fireproof coating attachment region to which the fireproof coating is attached, and the stiffening portion installation region does not overlap with the fireproof coating attachment region. According to this structure, when the stiffening part is provided in the panel main body part, the stiffening part is fixed in a state of being in direct contact with the panel main body part without interfering with the fireproof coating. It is possible to suitably join the stiffening part.

  Further, the stiffening part is fastened to the panel main body part by adhesion and mechanical fixing means. According to the adhesion, the stiffening portion can be suitably fastened to the panel main body so as to contribute to the cross-sectional performance of the floor panel body. Moreover, according to the mechanical fixing means, it is possible to prevent the stiffening portion from falling off from the panel main body portion.

  The sound insulation floor structure according to another aspect of the present invention includes a main beam arranged parallel to each other with a predetermined span and an additional beam arranged between the main beams and dividing the predetermined span into divided spans having equal beam intervals. And a floor panel body in which the first natural frequency defined by the beam interval is equal to or higher than the target natural frequency, the floor panel body being defined by the beam interval. The natural frequency of 2 is equal to or higher than the target natural frequency, and has a panel main body that defines the cross-sectional performance of the floor panel body.

  In this sound insulating floor structure, the second natural frequency of the panel body defined by the beam spacing is equal to or higher than the target natural frequency. According to such a structure, since the natural frequency of the panel body is equal to or higher than the target natural frequency, it is not necessary to provide an additional beam. Therefore, the deterioration of the workability of the floor structure due to the addition of additional beams is suppressed.

  The target natural frequency is 100 Hz. According to this natural frequency, the natural frequency of the sound-insulating floor structure can be made different from the frequency of the heavy impact sound. Therefore, it is possible to suppress a decrease in sound insulation performance of the sound insulation floor structure due to resonance.

  The target natural frequency is 120 Hz. According to this natural frequency, the natural frequency of the sound-insulating floor structure can be made different from the frequency of the heavy impact sound. Therefore, it is possible to suppress a decrease in sound insulation performance of the sound insulation floor structure due to resonance.

  The panel body is an ALC panel. According to the ALC panel, the fireproof performance of the sound insulation floor structure can be enhanced. Moreover, it becomes possible to reduce a panel main-body part weight, and can suppress the fall of the natural frequency of a floor panel body by extension.

  The division span may be 6 to 10 times the thickness of the panel body.

  Further, the lower surface of the panel main body has a beam fixing region to which the main beam and the additional beam are attached, and the beam fixing region is a concave portion depressed in the thickness direction of the panel main body. According to this structure, the thickness of the portion of the floor panel body that does not affect the natural frequency is reduced. Therefore, since the thickness of the floor panel body on the main beam and the additional beam is reduced, the overall height of the sound insulation floor structure is reduced, and the floor finish height can be suppressed. As a result, it becomes easier to secure the ceiling height of the upper floor.

The panel body is a high rigidity ALC panel having a Young's modulus of 2500 N / mm ² or more. According to the high-rigidity ALC panel, the first natural frequency of the floor panel body can be further increased.

  Another aspect of the present invention is a floor panel body used for the sound insulating floor structure. Since the floor panel body has the first natural frequency equal to or higher than the target natural frequency, it is possible to improve the performance of blocking heavy impact sound.

  Another aspect of the present invention is a sound insulating floor structure building having the above sound insulating floor structure. In the sound insulation floor structure, the floor panel body has a first natural frequency equal to or higher than the target natural frequency. Therefore, in the building having the above sound insulation structure, it is possible to improve the insulation performance of heavy impact sound.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to improve the interruption | blocking performance of the weight impact sound of a floor structure, suppressing deterioration of the workability of a floor structure.

FIG. 1 is a cross-sectional view of the sound insulation floor structure according to the first embodiment. FIG. 2 is a diagram for explaining the target natural frequency and the lower limit natural frequency. FIG. 3 is a cross-sectional view of a floor panel body according to a modification. FIG. 4 is a cross-sectional view of a floor panel body according to another modification. FIG. 5 is a cross-sectional view of a floor panel body according to still another modification. FIG. 6 is a cross-sectional view of a floor panel body having a non-stiffening portion in the second embodiment. FIG. 7 is a table showing the results of Examples 1 to 7. FIG. 8 is a table showing the results of Example 8. FIG. 9 is a graph showing the results of Example 9.

<First Embodiment>
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  The sound insulation floor structure is applied to an S structure sound insulation floor structure building that requires a heavy impact sound insulation performance. As shown in FIG. 1, the sound insulation floor structure 1 according to the first embodiment includes main beams 2A and 2B arranged in parallel with each other with a predetermined span S1. An additional beam 3 is disposed between the main beams 2A and 2B so as to be parallel to the main beams 2A and 2B. The main beams 2A and 2B and the additional beam 3 are shaped steel such as H-shaped steel. The predetermined span S1 between the main beams 2A and 2B is, for example, 2.0 m. The predetermined span S1 can be selected to have an arbitrary length, and may be 1.8 m, for example. Further, the additional beam 3 is arranged so that the divided span S2 is an integral fraction of 1/2 or 1/3 of the predetermined span S1. In the present embodiment, the additional beam 3 is disposed at an intermediate position between the main beams 2A and 2B so that the divided span S2 is ½ of the predetermined span S1. Accordingly, between the main beams 2A and 2B, the split span S2 in which the beam interval between the main beam 2A and the additional beam 3 is 1.0 m, and the beam interval between the additional beam 3 and the main beam 2B. A split span S2 having a length of 1.0 m is formed.

  Between the main beams 2A and 2B and the additional beam 3, the floor panel bodies 4 are respectively arranged so as to straddle the divided span S2. The floor panel body 4 has a longitudinal direction D1 orthogonal to the extending direction D2 of the main beams 2A and 2B. In other words, the short direction D3 of the floor panel body 4 is parallel to the extending direction D2 of the main beams 2A and 2B. It is arranged to be.

  The floor panel body 4 includes a panel body 6 and stiffening portions 7a and 7b. The panel body 6 is a base part of the floor panel body 4. Further, the stiffening portions 7 a and 7 b cooperate with the panel main body portion 6 and contribute to the cross-sectional performance of the floor panel body 4.

For the panel main body 6, a regular or irregular material having higher rigidity (Young's modulus) than the panel main body 6 can be used. For example, the amorphous material includes mortar and self-leveling material. Further, as the standard material, an inorganic material having a board-like shape is preferable, and a cement-based material, a calcium (calcium silicate) -based material, or a metal-based material is more preferable. As an example, the high-rigidity ALC panel as the panel body 6 in the present embodiment is a plate-like member having a longitudinal (longitudinal direction) of 2000 mm, a lateral (short side direction) of 500 mm, and a thickness of 100 mm, and has a Young's modulus of 2500 N. / Mm ² or more. The high-rigidity ALC panel has a Young's modulus of about 1.5 times to 10 times, more preferably about 2 times to 5 times that of a general ALC panel.

  In addition to the high-rigidity ALC panel, the panel main body 6 can use a general ALC panel, a concrete plate, an extruded cement plate, wood, a wood panel, an engineered wood panel, a metal panel, and the like. It is.

  Here, it is preferable that the respective values are set so that the beam interval, which is the length of the divided span S2, is 6 times or more and 10 times or less with respect to the thickness of the panel body 6. Generally, the thickness of the ALC panel for floors is 100 mm to 150 mm. Therefore, the beam interval is set to 600 mm to 1500 mm or less.

  On the lower surface 6a of the panel body 6, a beam fixing region Z2 formed at both ends in the longitudinal direction D1 and a stiffening portion installation region Z1 formed between the beam fixing regions Z2 are set. The beam fixing region Z <b> 2 is a region fixed in a state in which the main beam 2 </ b> A, 2 </ b> B or the additional beam 3 is in direct contact with the panel body 6. The beam fixing region Z2 is a recess 6c that is depressed in the thickness direction of the panel main body 6. In other words, the panel main body 6 has a cross-sectional defect of the lower surface 6a of the portion that rests on the main beams 2A and 2B and the additional beam 3. Therefore, the beam fixing region Z2 is thinner than the stiffening portion installation region Z1. The stiffening portion installation region Z1 is a region that is fixed in a state where the stiffening portion 7b is in direct contact with the panel main body portion. The stiffening portion installation area Z1 is set so as not to overlap with the beam fixing area Z2.

  On the outer circumferential surfaces of the main beams 2A and 2B and the additional beam 3, a fireproof coating 8 is formed. The end portion of the fireproof coating 8 reaches the lower surface 6 a of the panel body 6. For this reason, on the lower surface 6 a of the panel body 6, a fireproof coating attachment region Z <b> 3 to which the end of the fireproof coating 8 is fixed is set. The fireproof covering attachment region Z3 is set at a position adjacent to the beam fixing region Z2 and not overlapping with the stiffening portion installation region Z1.

  As described above, the stiffening portions 7 a and 7 b cooperate with the panel main body portion 6 and contribute to the cross-sectional performance of the floor panel body 4, so that the stiffening portions 7 a and 7 b with respect to the panel main body portion 6. Are integrated. Here, the term “integrated” refers to a state in which the stiffening portions 7a and 7b can be contributed to the cross-sectional performance of the floor panel body 4 by being bonded or adhered, and basically the stiffening portions 7a and 7b and the floor panel. A state where the entire contact surfaces of the body 4 are fixed to each other.

  In the present embodiment, the stiffening portion 7 a is a C channel bonded to the lower surface 6 a of the panel body 6. Further, the stiffening portion 7 b is a mortar attached to the upper surface 6 b of the panel body portion 6.

  For the stiffening portions 7a and 7b, for example, an indeterminate shape material such as mortar or self-leveling material or a board-like shape material can be used. The fixed material is preferably an inorganic material, more preferably a cement-based material, a calcium-based material, and a metal-based material. In addition, as the standard material, steel having a cross-sectional shape of square, L-type, T-type, I-type, C-type, corrugated, square-wave can be used. In this case, it may be solid or cylindrical hollow. Moreover, wood and LVL (single plate laminated material) can also be used as the standard material.

  Further, one of the stiffening portions 7a and 7b is provided with respect to the floor panel body 4 so that the boundary position with the panel main body portion 6 is in the vicinity of the neutral axis position in the thickness direction of the floor panel body 4. Yes. More specifically, in the vicinity of the neutral axis position, it is more preferable to be in a position that becomes a compression region when bending occurs.

  In addition, you may fasten board material (not shown) to the upper surface 6b of the panel main-body part 6 as needed. Board materials include plywood, particle board, MDF (medium fiber board), OSB (structural panel), hard board, and inorganic boards such as cement, calcium, volcanic glass, and glass. is there. The calcium-based board includes a high-rigidity ALC panel.

  Next, the sound insulation performance in the sound insulation floor structure will be described. The sound insulation performance is the degree to which the heavy impact sound generated in the floor structure is attenuated. The greater the attenuation, the higher the sound insulation performance. When the floor structure is assumed to be a vibration system with one degree of freedom, a transfer curve having a peak at the natural frequency of the floor structure is defined. When a heavy impact sound is generated in the floor structure, the floor is multiplied by a transmission magnification corresponding to the frequency of the heavy impact sound and transmitted downstairs. Here, when the frequency of the heavy impact sound is close to the natural frequency of the floor structure, the heavy impact sound cannot be attenuated by the resonance action. In order to attenuate the heavy impact sound, it is necessary to separate the frequency of the heavy impact sound and the natural frequency of the floor structure as much as possible. As the frequency of the heavy impact sound is separated from the natural frequency of the floor structure, a decrease in sound insulation performance due to resonance is avoided.

  As shown in FIG. 2, generally, the determination frequency of the heavy impact sound cutoff performance is often 63 Hz. Therefore, it is desired that the natural frequency of the floor structure is larger than 63 Hz. The target natural frequency is a natural frequency that the floor structure should have in order to ensure the predetermined sound insulation performance, and is a design value set in accordance with the required sound insulation performance. For example, the target natural frequency is set to 100 Hz or 120 Hz in the range of 100 Hz to 120 Hz. In the present embodiment, the first natural frequency refers to the primary natural frequency of the floor panel body 4 disposed between the main beams 2A and 2B and the additional beam 3, and the floor panel body of the present embodiment. 4 has a natural frequency equal to or higher than a target natural frequency (100 Hz). This natural frequency is determined by the beam spacing between the main beams 2A and 2B and the additional beam 3, the cross-sectional performance of the floor panel body 4, and the like. The calculation of the natural frequency will be described later.

  As described above, the floor panel body 4 includes the panel body 6 and the stiffening portions 7a and 7b. Here, in the present embodiment, the second natural frequency is the natural frequency of the panel main body 6 when it is assumed that only the panel main body 6 is disposed between the main beams 2A and 2B and the additional beam 3. Say. Here, the second natural frequency of the present embodiment is less than the target natural frequency and is equal to or greater than the lower limit natural frequency. That is, since the second natural frequency of only the panel body 6 is smaller than the target natural frequency, there may be a case where sufficient sound insulation performance cannot be ensured only by the panel body 6. Therefore, the panel body 6 is provided with the stiffening portions 7a and 7b to increase the rigidity of the entire floor panel body 4 so that the floor panel body 4 has a target natural frequency or higher. Therefore, the lower limit natural frequency is a lower limit value that allows the natural frequency of the floor panel body 4 to be equal to or higher than the target natural frequency by adding the stiffening portions 7a and 7b. This lower limit natural frequency is determined by the cross-sectional performance of the floor panel body 4, the beam interval, the rigidity and dimensions of the stiffening portions 7a and 7b to be used, and the like. As an example, the lower limit natural frequency is 40 Hz.

上記式（１）において、ｆ_１は共振周波数（Ｈｚ）であり、ω_１は角振動数（ｒａｄ／ｓｅｃ）である。また、αは断面性能であり、ｋは定数（ｋ＝１、第１次固有振動数）であり、Ｌは梁間隔である。また、断面性能において、Ｅはヤング率（Ｎ／ｍｍ^２）であり、Ｉは断面二次モーメント（ｍｍ^４）であり、ρはパネル本体部６の密度であり、Ａはパネル本体部６の長手方向端部の断面積である。なお、ヤング率Ｅと断面二次モーメントＩの積（Ｅ×Ｉ）は、いわゆる曲げ剛性（Ｎ・ｍｍ^２）である。 Next, the construction method of the sound insulation floor will be described. First, as a first step, a second natural frequency of the panel body 6 is calculated. The second natural frequency is calculated using the following equation (1).

In the above formula (1), f ₁ is the resonance frequency (Hz), and ω ₁ is the angular frequency (rad / sec). Α is a cross-sectional performance, k is a constant (k = 1, first natural frequency), and L is a beam interval. Further, in the cross-sectional performance, E is Young's modulus (N / mm ² ), I is the cross-sectional secondary moment (mm ⁴ ), ρ is the density of the panel body 6, and A is the panel body 6. It is a cross-sectional area of a longitudinal direction end. The product (E × I) of the Young's modulus E and the cross-sectional secondary moment I is the so-called bending rigidity (N · mm ² ).

  The calculation method of the second natural frequency is not limited to the above formula (1), and a known calculation method can be used.

  Subsequently, in the second step, it is determined whether or not the second natural frequency is greater than or equal to the lower limit natural frequency and less than the target natural frequency. When the second natural frequency is equal to or higher than the lower limit natural frequency and lower than the target natural frequency, a third step of providing the stiffening portion 7a on the panel body 6 is performed.

  In the third step, first, the C channel as the stiffening portion 7a is bonded to the stiffening portion installation region Z1 on the lower surface 6a of the panel main body portion 6. By this step, the panel body 6 and the stiffening portion 7a are integrated.

  Subsequently, in a fourth step, a structural body having the main beams 2A and 2B and the additional beam 3 is constructed, and a panel main body portion 6 in which a stiffening portion 7a is provided between the main beams 2A and 2B and the additional beam 3 is provided. Place. Then, a fireproof coating 8 is formed on the outer peripheral surfaces of the main beams 2A and 2B and the additional beam 3 by spraying or the like. Moreover, after apply | coating uncured mortar to the upper surface 6b of the panel main-body part 6 and the clearance gap between panel main-body parts 6, it is left to cure for a predetermined time. The hardened mortar forms the stiffening part 7b. The sound insulation floor structure 1 is constructed by the above steps.

  That is, in the construction method of the present embodiment, the stiffening portion 7a is mounted in advance at a factory or the like. To summarize the construction method of the present embodiment, the second natural frequency is calculated in the first step, the second step is performed after the first step, the target frequency and the lower limit frequency, and the second frequency. The natural frequency is compared, the third step is performed after the second step, the stiffening portion 7a is mounted, and the fourth step is performed after the third step to construct the structural frame.

  In addition, the stiffening part 7a may be mounted in the field without being mounted in advance at a factory or the like. That is, in the third step and the fourth step, the fourth step may be performed before the third step. In other words, the fourth step may be performed after the second step, and the third step may be performed after the fourth step.

  Next, the effect of the sound insulation floor structure and the construction method of the sound insulation floor structure according to the present embodiment will be described.

  The floor panel body 4 of the sound insulation floor structure 1 has a panel main body 6 and stiffening portions 7 a and 7 b that define the cross-sectional performance of the floor panel body 4 in cooperation with the panel main body 6. The panel body 6 is provided with the stiffening portions 7a and 7b, although the second natural frequency defined by the beam spacing is equal to or higher than the lower limit natural frequency and lower than the target natural frequency. The first natural frequency of the body 4 is equal to or higher than the target natural frequency. According to such a structure, even if the natural frequency of the panel body 6 is less than the target natural frequency, if it is equal to or higher than the lower limit natural frequency, it is necessary to provide the additional beam 3 in order to further shorten the predetermined span S1. Disappears. Therefore, the deterioration of the workability of the sound insulation floor structure 1 due to the addition of the additional beam 3 is suppressed. Then, by providing the panel body 6 with the stiffening portions 7a and 7b, the natural frequency of the floor panel body 4 formed by the panel main body 6 and the stiffening portions 7a and 7b is increased to a target natural frequency or higher. Therefore, it is possible to improve the weight impact sound blocking performance.

  In the floor panel body 4, the boundary position between the panel body 6 and one of the stiffening portions 7 a and 7 b is a neutral axis position in the thickness direction of the floor panel body 4. According to this structure, when an external force is applied to the floor panel body 4, the generation of shearing force is suppressed at the joint surface between the panel main body 6 and one of the stiffening portions 7a and 7b, and the elastic deformation occurs at the boundary portion. Is reduced. Therefore, damage at the boundary between the panel body 6 and one of the stiffening portions 7a and 7b can be suppressed.

  Further, the stiffening portions 7a and 7b are fastened to the panel body 6 by mechanical fixing means such as adhesion and screws. According to the adhesion, the stiffening portions 7 a and 7 b can be suitably fastened to the panel main body 6 so as to contribute to the cross-sectional performance of the floor panel body 4. Further, according to the mechanical fixing means, it is possible to prevent the stiffening portions 7a and 7b from dropping from the panel main body portion 6.

  The target natural frequency is 100 Hz, and the lower limit natural frequency is 40 Hz. According to these natural frequencies, the natural frequency of the sound insulating floor structure 1 can be made different from the frequency of the heavy impact sound. Therefore, it is possible to suppress a decrease in sound insulation performance of the sound insulation floor structure 1 due to resonance.

  Further, the stiffening portion 7 a is provided on the lower surface 6 a of the panel main body portion 6. The lower surface 6a of the panel main body 6 is a place that cannot be seen after construction. Therefore, since the stiffening portion 7a is disposed at a position where it cannot be seen, the design can be improved.

The panel body 6 is an ALC panel. According to the ALC panel, the fireproof performance of the sound insulating floor structure 1 can be enhanced. In addition, since the ALC panel is relatively light, a decrease in the natural frequency of the floor panel body 4 can be suppressed. The panel body 6 is a high-rigidity ALC panel having a Young's modulus of 2500 N / mm ² or more. According to the high-rigidity ALC panel, the first natural frequency of the floor panel body 4 can be further increased.

  Further, the lower surface 6 a of the panel main body 6 has a beam fixing region Z 2 to which the main beams 2 A and 2 B and the additional beam 3 are attached. The beam fixing region Z 2 is a recess 6 c that is depressed in the thickness direction of the panel main body 6. It is. According to this structure, the thickness of the portion of the floor panel body 4 that does not affect the natural frequency is reduced. Accordingly, since the thickness of the floor panel body 4 on the main beams 2A and 2B and the additional beam 3 is reduced, the overall height of the sound insulating floor structure 1 can be reduced.

  In this construction method, the natural frequency of the panel body 6 is calculated, and the stiffening portions 7a and 7b are provided on the lower surface 6a and the upper surface 6b of the panel body 6 when the natural frequency is the lower limit natural frequency. According to these steps, even if the natural frequency of the panel main body 6 is less than the target natural frequency, the panel main body 6 and the stiffening are not provided without further providing the additional beam 3 in order to shorten the predetermined span S1. The natural frequency of the floor panel body 4 formed by the portions 7a and 7b is increased to be higher than the target natural frequency. In other words, when the natural frequency of the panel body 6 is equal to or higher than the lower limit natural frequency and less than the target natural frequency and no stiffening portion is provided, an additional beam 3 is provided to satisfy the target natural frequency. Such processes are required. On the other hand, in this construction method, it is not necessary to provide the additional beam 3, and the target natural frequency can be satisfied by mounting the stiffening portions 7a and 7b that can be constructed more easily. Therefore, the deterioration of the workability of the sound insulation floor structure 1 due to the addition of the additional beam 3 is suppressed. Then, by providing the panel body 6 with the stiffening portions 7a and 7b, the natural frequency of the floor panel body 4 formed by the panel main body 6 and the stiffening portions 7a and 7b is increased to a target natural frequency or higher. Therefore, the sound insulation performance of the sound insulation floor structure 1 can be improved.

Second Embodiment
Next, the sound insulation floor structure according to the second embodiment will be described. The sound insulation floor structure according to the second embodiment is different from the sound insulation floor structure according to the first embodiment in that the floor panel body 4 has non-stiffening portions instead of the stiffening portions 7a and 7b.

  As shown in part (a) of FIG. 6, the floor panel body 4B has a panel body 6B and a board 10 attached to the upper surface 6b of the panel body 6B. The board 10 provides the panel body 6B with a function different from the increase in rigidity of the floor panel body 4B. The board 10 is partially fastened to the panel body 6B by mechanical fixing means such as screws 9. In addition to the screws 9, anchors may be used. The screwed board 10 is attached to the panel body 6B, but cannot contribute to the cross-sectional performance.

  In the panel main body 6B, the second natural frequency defined by the beam interval is equal to or higher than a target natural value (for example, 100 Hz). Therefore, the first natural frequency in the floor panel body 4B is the same as the second natural frequency in the panel main body 6B, and the cross-sectional performance of the panel main body 6B becomes the cross-sectional performance of the floor panel body 4B.

  Next, the construction method of the sound insulation floor structure 1 which concerns on 2nd Embodiment is demonstrated. The construction method according to the second embodiment is different from the construction method according to the first embodiment in that the second natural frequency is equal to or higher than the target natural frequency in the second step. In this case, since only the panel body portion 6B satisfies the target eigenvalue, whether or not the stiffening portions 7a and 7b are provided in the panel body portion 6B can be arbitrarily selected. When higher sound insulation performance is desired, the same work as the work in the third step may be performed to provide the stiffening parts 7a and 7b integrated with the panel main body part 6B. Moreover, you may provide the non-stiffening part which cannot contribute to cross-sectional performance like the board 10. FIG.

  In the construction method of the sound insulation floor structure 1, when the natural frequency is equal to or higher than the target natural frequency, the upper surface 6b of the panel main body 6B is not supplemented so that the cross-sectional performance of the floor panel body 4B is defined by the panel main body 6B. It further has the process of providing the board 10 as a rigid part. According to this process, since the non-stiffening portion is provided, a function different from the increase in rigidity of the floor panel body 4B can be imparted to the floor panel body 4B.

  The present invention is not limited to the above-described embodiment, and various modifications as described below are possible without departing from the gist of the present invention.

  As shown in part (a) of FIG. 3, in the floor panel body 4 </ b> C, the stiffening part 7 </ b> C may be formed only on the upper surface 6 b of the panel main body part 6. Further, the stiffening portion 7C is formed by attaching an irregular material 12 such as a mortar or a self-leveling material to the upper surface 6b of the panel main body 6 so as to be integrated with the panel main body 6.

  Further, as shown in FIG. 3 (b), the stiffening portion 7D of the floor panel body 4D is formed by adhering a board 13 such as a calcium plate or a flexible plate to the upper surface 6b of the panel main body 6. It may be integrated with the part 6. The stiffening portion 7D is preferably bonded to the entire upper surface 6b of the panel body 6. It is desirable that this adhesive has elasticity. In addition to fixing by bonding, mechanical fixing means (not shown) such as screws and through bolts may be used together.

  Further, as shown in FIG. 3 (c), the stiffening portion 7E of the floor panel body 4E is formed by adhering a board 14 such as a calcium plate or a flexible plate to the lower surface 6a of the panel body portion 6 to form a panel body. It may be integrated with the part 6.

  Further, as shown in FIGS. 4A and 4B, the stiffening portion 7F of the floor panel body 4F is formed by adhering the C channel 16 to the lower surface 6a of the panel body portion 6 so that the panel body It may be integrated with the part 6. Furthermore, in addition to fixing by adhesion, mechanical fixing means such as screws (not shown) and through bolts may be used together.

  4C, the stiffening portion 7G of the floor panel body 4G has a bulging portion 17 so that the plate thickness t of the stiffening portion installation region Z1 of the panel main body portion 6 is increased. May be formed. The cross-sectional secondary moment I that defines the cross-sectional performance is proportional to the cube of the plate thickness t in the stiffening portion installation region Z1 of the panel body 6. Therefore, by increasing the plate thickness t, the cross-sectional secondary moment I increases, and as a result, the natural frequency can be increased as shown in the above equation (1).

  5A and 5B, the stiffening portion 7H of the floor panel body 4H includes a board 19 such as a calcium plate or a flexible plate, a screw 9 and a shear connector 21. It may be used and integrated with the panel body 6. The shear connector 21 is disposed between the board 19 and the panel body 6. The shear connector 21 has a plurality of protrusions extending in the thickness direction of the panel main body portion 6, and these protrusions pierce the board 19 and the panel main body portion 6 to counter an external force acting in the shearing direction. .

  Further, as shown in FIGS. 6B and 6C, the non-stiffening portion 22 of the floor panel body 4K is provided with a linear shape steel 23 such as a C channel on the lower surface 6a of the panel main body 6. It may be fastened with screws 9.

  Moreover, in the said embodiment, although the floor panel body 4 was a 2 point support form supported by the main beam 2A and the additional beam 3, or the main beam 2B and the additional beam 3, it is not limited to this support form, The form supported in many points and the form supported continuously may be sufficient.

  Next, the floor panel bodies of Examples 1 to 7 were prepared, and the natural frequencies of the respective floor panel bodies were confirmed. In the following embodiments, it is assumed that the length in the longitudinal direction of the floor panel body is a beam interval in calculating the natural frequency. Moreover, the result of Example 1- Example 7 is put together in FIG.

<Example 1>
The floor panel body according to Example 1 is an ALC panel having a length in the short side direction of 500 mm and a thickness of 100 mm. There are no stiffening portions on the upper and lower surfaces of the ALC panel.
In this floor panel body, the natural frequency is 22 Hz when the length in the longitudinal direction is 2.0 m, and the natural frequency when the length in the longitudinal direction is ½, 1.0 m. Was 88 Hz. Further, in this floor panel body, the natural frequency is 27 Hz when the length in the longitudinal direction is 1.8 m, and the natural frequency when the length in the longitudinal direction is 0.9 m which is ½. The frequency was 109 Hz. Therefore, it was confirmed that the floor panel body according to Example 1 exceeded the target natural frequency (100 Hz) when the length in the longitudinal direction was 0.9 m.

<Example 2>
The floor panel body according to Example 2 is an ALC panel having a length in the short side direction of 500 mm and a thickness of 100 mm. On the upper surface of the ALC panel, a stiffening portion made of a cured mortar having a thickness of 12 mm was provided. Further, no stiffening portion is provided on the lower surface of the ALC panel.
In this floor panel body, the natural frequency is 34 Hz when the length in the longitudinal direction is 2.0 m, and the natural frequency when the length in the longitudinal direction is ½, 1.0 m. Was 134 Hz. Further, in this floor panel body, the natural frequency is 41 Hz when the length in the longitudinal direction is 1.8 m, and the natural frequency when the length in the longitudinal direction is ½, 0.9 m. The frequency was 166 Hz. Therefore, it was confirmed that the floor panel body according to Example 2 exceeded the target natural frequency (100 Hz) when the length in the longitudinal direction was 1.0 m and 0.9 m. Furthermore, it was confirmed that it exceeded the target natural frequency (120 Hz) that can further improve the sound insulation performance, and it was found that high sound insulation performance can be achieved.

<Example 3>
The floor panel body according to Example 3 is an ALC panel having a length in the short side direction of 500 mm and a thickness of 100 mm. On the upper surface of the ALC panel, a stiffening portion made of a cured mortar having a thickness of 12 mm was provided. Further, a stiffening portion made of a 6 mm thick calcium plate was provided on the lower surface of the ALC panel.
In this floor panel body, the natural frequency is 39z when the length in the longitudinal direction is 2.0 m, and the natural frequency when the length in the longitudinal direction is ½, 1.0 m. Was 156 Hz. Further, in this floor panel body, the natural frequency is 48 Hz when the length in the longitudinal direction is 1.8 m, and the natural frequency when the length in the longitudinal direction is 0.9 m which is ½. The frequency was 193 Hz. Therefore, it was confirmed that the floor panel body according to Example 3 exceeded the target natural frequency (100 Hz) when the length in the longitudinal direction was 1.0 m and 0.9 m. Furthermore, it was confirmed that it exceeded the target natural frequency (120 Hz) that can further improve the sound insulation performance, and it was found that high sound insulation performance can be achieved.

<Example 4>
The floor panel body according to Example 4 is an ALC panel having a length in the short side direction of 500 mm and a thickness of 100 mm. A stiffening portion is not provided on the upper surface of the ALC panel. Further, a stiffening portion made of a 6 mm thick calcium plate was provided on the lower surface of the ALC panel.
In this floor panel body, the natural frequency is 26 Hz when the length in the longitudinal direction is 2.0 m, and the natural frequency when the length in the longitudinal direction is ½, 1.0 m. Was 103 Hz. Further, in this floor panel body, the natural frequency is 32 Hz when the length in the longitudinal direction is 1.8 m, and the natural frequency when the length in the longitudinal direction is 0.9 m which is ½. The frequency was 127 Hz. Therefore, it was confirmed that the floor panel body according to Example 3 exceeded the target natural frequency (100 Hz) when the length in the longitudinal direction was 1.0 m and 0.9 m. Furthermore, it was confirmed that it exceeded the target natural frequency (120 Hz) that can further improve the sound insulation performance, and it was found that high sound insulation performance can be achieved.

<Example 5>
The floor panel body according to Example 5 is an ALC panel having a length in the short side direction of 500 mm and a thickness of 100 mm. A stiffening portion is not provided on the upper surface of the ALC panel. Further, a stiffening portion by LVL having a width of 89 mm and a width of 140 mm was provided on the lower surface of the ALC panel.
In this floor panel body, the natural frequency is 65 Hz when the length in the longitudinal direction is 2.0 m, and the natural frequency when the length in the longitudinal direction is ½, 1.0 m. Was 262 Hz. Further, in this floor panel body, the natural frequency is 81 Hz when the length in the longitudinal direction is 1.8 m, and the natural frequency when the length in the longitudinal direction is 0.9 m which is ½. The frequency was 323 Hz. Therefore, it was confirmed that the floor panel body according to Example 3 exceeded the target natural frequency (100 Hz) when the length in the longitudinal direction was 1.0 m and 0.9 m. Furthermore, it was confirmed that it exceeded the target natural frequency (120 Hz) that can further improve the sound insulation performance, and it was found that high sound insulation performance can be achieved.

<Example 6>
The floor panel body according to Example 6 is an ALC panel having a length in the short side direction of 500 mm and a thickness of 125 mm. On the upper surface of the ALC panel, a stiffening portion made of a cured mortar having a thickness of 12 mm was provided. Further, no stiffening portion is provided on the lower surface of the ALC panel.
In this floor panel body, the natural frequency is 40 Hz when the length in the longitudinal direction is 2.0 m, and the natural frequency when the length in the longitudinal direction is ½, 1.0 m. Was 162 Hz. Further, in this floor panel body, the natural frequency is 50 Hz when the length in the longitudinal direction is 1.8 m, and the natural frequency when the length in the longitudinal direction is ½, 0.9 m. The frequency was 200 Hz. Therefore, it was confirmed that the floor panel body according to Example 3 exceeded the target natural frequency (100 Hz) when the length in the longitudinal direction was 1.0 m and 0.9 m. Furthermore, it was confirmed that it exceeded the target natural frequency (120 Hz) that can further improve the sound insulation performance, and it was found that high sound insulation performance can be achieved.

<Example 7>
The floor panel body according to Example 7 is an ALC panel having a length in the short side direction of 500 mm and a thickness of 100 mm. This ALC panel is a high-rigidity ALC panel having twice the rigidity of the ALC panels in Examples 1 to 5. Further, a stiffening portion made of a cured mortar having a thickness of 12 mm was provided on the upper surface of the ALC panel. Further, no stiffening portion is provided on the lower surface of the ALC panel.
In this floor panel body, the natural frequency is 39 Hz when the length in the longitudinal direction is 2.0 m, and the natural frequency when the length in the longitudinal direction is ½, 1.0 m. Was 156 Hz. Further, in this floor panel body, the natural frequency is 48 Hz when the length in the longitudinal direction is 1.8 m, and the natural frequency when the length in the longitudinal direction is 0.9 m which is ½. The frequency was 192 Hz. Therefore, it was confirmed that the floor panel body according to Example 3 exceeded the target natural frequency (100 Hz) when the length in the longitudinal direction was 1.0 m and 0.9 m. Furthermore, it was confirmed that it exceeded the target natural frequency (120 Hz) that can further improve the sound insulation performance, and it was found that high sound insulation performance can be achieved.

<Example 8>
In Example 8, the relationship between the beam interval and the natural frequency was confirmed. In the panel main body which is an ALC panel, the thickness was set to 100 mm, and the length in the short direction was set to 500 mm. The beam spacing (here, the length in the longitudinal direction of the ALC panel) is set to 500 mm, 600 mm, 700 mm, 800 mm, 900 mm, 1000 mm, 1100 mm, 1200 mm, 1500 mm, and 2000 mm, and the natural frequency corresponding to each length is calculated. did.

  Furthermore, the configuration of the reinforcing bars arranged inside the ALC panel was selected as a parameter for calculation. Under the first condition, seven reinforcing bars having a diameter of 7 mm were arranged on the compression side and seven on the tension side along the longitudinal direction of the ALC panel. Under the second condition, two reinforcing bars having a diameter of 7 mm along the longitudinal direction of the ALC panel were arranged on the compression side and seven on the tension side. Under the third condition, two reinforcing bars having a diameter of 5 mm along the longitudinal direction of the ALC panel were arranged on the compression side and seven on the tension side. That is, the first condition is a condition where the rigidity of the ALC panel is the highest, and the third condition is a condition where the rigidity of the ALC panel is the lowest.

  As shown in FIG. 8, it was confirmed that the natural frequency increases as the beam interval is shortened. In particular, when the beam interval is smaller than 900 mm, it has been confirmed that the target natural frequency (100 Hz) or more can be achieved in all of the first to third conditions. Moreover, it has confirmed that the natural frequency of a panel main-body part became high, so that the rigidity of an ALC panel was high.

<Example 9>
In Example 9, an ALC panel without a stiffening part and an ALC panel with various stiffening parts were created, and a response vibration was confirmed by performing a test using them. In Example 9, the beam interval was set to 2 m or 1 m, impact was applied by hitting the ALC panel, and the acceleration in the 63 Hz band generated in the ALC panel was measured.

  As shown in FIG. 9, plots P1 to P6 are results when the beam interval is 2 m. Plot P1 corresponds to the conditions of Example 1 and is the result of an ALC panel that does not have a stiffening portion. Plots P2 to P6 are results of ALC panels provided with various stiffening portions. Further, the condition of the plot P5 corresponds to the condition of the fifth embodiment. In contrast to the ALC panel without the stiffening part, by providing the stiffening part, as the natural frequency of the ALC panel approaches the frequency of input shock (63 Hz), the acceleration increased due to the resonance action. . As the natural frequency of the ALC panel becomes higher than the input impact frequency (63 Hz), the generated acceleration decreases.

  Plots P7 to P11 are results when the beam interval is 1 m. Plot P7 corresponds to the condition of Example 1 and is a result of an ALC panel that does not have a stiffening portion. The plot P7 is the result of the ALC panel without the stiffening portion, and the plots P8 to P11 are the results of the ALC panel with the various stiffening portions. Further, the condition of the plot P8 corresponds to the condition of the second embodiment, and the condition of the plot P11 corresponds to the condition of the third embodiment. When the beam interval was shortened, it was confirmed that the natural frequency of the ALC panel generally increased. Further, as the natural frequency of the ALC panel became higher than the frequency of input shock (63 Hz), the generated acceleration was reduced. Furthermore, the acceleration when the natural frequency is about 100 Hz or more (plots P8 to P11) is smaller than the acceleration (plots P1 to P6) generated in an ALC panel with a beam interval of 2 m and no stiffening portion. Was confirmed.

DESCRIPTION OF SYMBOLS 1 ... Sound insulation floor structure, 2A, 2B ... Main beam, 3 ... Additional beam, 4, 4B-4H, 4K ... Floor panel body, 6, 6B ... Panel main-body part, 6a ... Lower surface, 6b ... Upper surface, 6c ... Recessed part, 7a, 7b, 7C to 7H: stiffening part, 22 ... non-stiffening part, 8 ... fireproof coating, 9 ... screw, 10, 13, 14, 19 ... board, 16 ... C channel, 17 ... bulging part, 21 DESCRIPTION OF SYMBOLS ... Shear connector, 22 ... Non-stiffening part, S1 ... Predetermined span, S2 ... Divided span, Z1 ... Stiffening part installation area, Z2 ... Beam fixing area, Z3 ... Fireproof covering installation area.

Claims (3)

A sound insulating floor in which an additional beam for dividing the predetermined span into divided spans having equal beam intervals is disposed between main beams arranged in parallel with each other with a predetermined span, and a floor panel body is disposed across the divided spans. In the construction method of
Using the beam spacing, calculating a natural frequency of the panel body included in the floor panel body; and
When the natural frequency is equal to or higher than the lower limit natural frequency, a stiffening portion that defines the cross-sectional performance of the floor panel body in cooperation with the panel main body is provided on the upper surface and / or the lower surface of the panel main body. A method for constructing a sound insulation floor structure.   In the step of providing the stiffening portion on the upper surface and / or the lower surface of the panel main body portion, when the natural frequency is equal to or higher than a lower limit natural frequency and lower than a target natural frequency, the stiffening portion is disposed on the panel main body portion. The construction method of the sound insulation floor structure of Claim 1 provided in an upper surface and / or a lower surface. A sound insulating floor in which an additional beam for dividing the predetermined span into divided spans having equal beam intervals is disposed between main beams arranged in parallel with each other with a predetermined span, and a floor panel body is disposed across the divided spans. In the construction method of
Using the beam spacing, calculating a natural frequency of the panel body included in the floor panel body; and
When the natural frequency is equal to or higher than the lower limit natural frequency and lower than the target natural frequency, a stiffening portion that defines the cross-sectional performance of the floor panel body in cooperation with the panel main body portion is provided on the panel main body portion. Provided on the upper surface and / or the lower surface, and when the natural frequency is equal to or higher than the target natural frequency, the upper surface of the panel body and / or the cross section performance of the floor panel body is defined by the panel body. Or providing a non-stiffening portion on the lower surface.

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