JP2020026660A - Floor structure - Google Patents

Abstract

To provide a floor structure using CLT capable of reducing heavy floor impact sound and reducing a construction period.SOLUTION: A floor structure 1 comprises: a floor main layer 20 formed by arranging side by side a plurality of floor members (CKT floor members 2) formed with CLT (cross laminated timber plate); and a heavy floor impact sound reducing layer 40 formed by arranging side by side plates materials (ALC plates 4) whose specific gravity is larger than that of the floor members (CKT floor members 2) on the floor main layer 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a floor structure configured using CLT (Cross Laminated Timber).

2. Description of the Related Art There are known medium-sized and large-scale wooden buildings such as schools, hotels, apartment buildings, nursing homes, and government offices that are constructed with a wall-type structure or a frame structure using CLT.
If a wooden building utilizing CLT is a medium-sized one of about three stories, a wall-type structure in which walls and floors are CLT is often adopted. In addition, in the case of a medium-sized or large-scale wooden building, a framed structure having columns and beams is adopted in addition to a wall-type structure, and CLT is used for its floor.
For example, a floor structure in which a floor plate using CLT (CLT floor plate) is installed between a pair of opposed beams is known (see Patent Document 1).
Conventionally, the CLT floorboard is, for example, a 150 mm or 210 mm thick, the length of the short side is up to about 3 m, the length of the long side is formed into a rectangular plate up to about 12 m, using the CLT floorboard, The CLT floor is constructed by laying it directly above the beams.
On the other hand, since such a CLT floor is a wooden floor, it has a smaller specific gravity and is lighter than a reinforced concrete floor, so that it is difficult to secure sound insulation performance particularly against heavy floor impact noise.
Therefore, as a floor structure particularly taking measures against heavy floor impact noise, as shown in FIG. 2, a floor structure 100 in which concrete 102 is cast on a floor main layer 101 formed by arranging a plurality of CLT floor materials (non-patented). There is known a floor structure in which a mortar is cast on a floor main layer formed by arranging a plurality of CLT floor materials (see Non-Patent Document 2).

JP 2017-25524 A

"Block Commons" in Vancouver, Canada, Nikkei Architecture "Wooden Wooden Design", June 26, 2017, p63. Huis Ten Bosch "Weird Hotel West Arm", New Architecture, July 2016, p113.

However, as described above, in a floor structure in which concrete is cast on the floor main layer or a floor structure in which mortar is cast on the floor main layer, a drying period of the concrete or mortar is required due to the wet construction method. And there is a disadvantage that the construction period becomes longer.
The present invention provides a floor structure using a CLT, which can reduce a heavy floor impact sound and can shorten a construction period.

According to the floor structure of the present invention, a floor main layer formed by arranging a plurality of floor members formed by orthogonally laminated plates, and a plurality of plate members having a specific gravity larger than the specific gravity of the floor material are arranged on the floor main layer. With the formed floor impact noise reduction layer, the floor structure using CLT can reduce the weight floor impact sound, and the construction of the floor impact noise reduction layer can be realized by dry method. Therefore, a floor structure capable of shortening the construction period can be provided.
A surface layer formed by arranging a plurality of surface plates on the heavy floor impact sound reduction layer, a surface plate forming the surface layer, a plate material forming the heavy floor impact sound reduction layer, and a floor forming the floor main layer Since the material is integrated with the fixing means, the heavy floor impact sound can be further reduced.
Further, since the buffer layer is provided between the upper surface of the floor main layer and the lower surface of the heavy floor impact sound reducing layer, the heavy floor impact sound can be further reduced.
In addition, a surface layer formed by arranging a plurality of surface plates on the heavy floor impact sound reduction layer is provided, and a surface plate forming the surface layer, a plate material forming the heavy floor impact sound reduction layer, and a cushioning material forming the buffer layer are provided. Since the floor and the floor material forming the floor main layer are integrated by the fixing means, the heavy floor impact noise can be further reduced.
Further, since the plate material is a lightweight cellular concrete plate, it is possible to provide a floor structure capable of reducing a heavy floor impact sound and shortening a construction period.

FIG. 2 is a cross-sectional view illustrating the floor structure according to the first embodiment. Sectional drawing which shows an example of the conventional floor structure.

Embodiment 1
As shown in FIG. 1, the floor structure 1 according to the first embodiment is provided on a floor main layer 20 formed by arranging a plurality of CLT floor members 2 formed by CLT and on an upper surface 21 of the floor main layer 20. Heavy floor impact formed by arranging a plurality of ALC (lightweight cellular concrete) plates 4 as a plate material having a specific gravity larger than the specific gravity of the CLT floor material 2 on the upper surface 31 of the buffer layer 30 formed by the buffer material 3 and the upper surface 31 of the buffer layer 30 A sound reduction layer 40, and a surface layer 50 formed by arranging a plurality of plywoods 5 as a surface plate on the heavy floor impact sound reduction layer 40, and screws 6 as fixing means are provided with the plywood 5, the ALC plate 4, The plywood 5 forming the surface layer 50, the ALC plate 4 forming the heavy floor impact sound reduction layer 40, and the buffer layer 30 are formed by being screwed so as to penetrate the buffer material 3 and being fixed to the CLT flooring 2. Cushioning material 3 and floor main layer 2 And CLT flooring 2 to form the constitute are integrated.

The floor main body layer 20 includes, for example, a plurality of CLT floor members 2, 2... Between a pair of girders or bases (not shown) arranged so that the upper surfaces are located on the same horizontal plane facing each other in parallel. A pair of girders or bases are arranged and arranged along the extending direction of the base.
In addition, CLT is defined as “a sawn board or a small squared wood (which is obtained by joining and adhering them in the length direction with their fiber directions substantially parallel to each other) as specified in the Ministry of Agriculture, Forestry and Fisheries Notification No. 3079. Is a general material in which three or more layers are laminated and bonded with their fiber directions substantially parallel to each other and arranged and bonded in the width direction, mainly with their fiber directions substantially perpendicular to each other. " .

The buffer layer 30 is configured such that, for example, a plurality of sheet-like cushioning materials 3 are arranged on the upper surface 21 of the floor main layer 20 so that the surface faces the upper surface 21 of the floor main layer 20. .
The heavy floor impact sound reducing layer 40 is configured such that a plurality of ALC plates 4, 4,... Are arranged on the upper surface 31 of the buffer layer 30 so that the plate surface faces the upper surface 21 of the floor main layer 20.
The surface layer 50 is configured such that a plurality of plywoods 5, 5... Are arranged on the upper surface 41 of the heavy floor impact sound reducing layer 40 such that the plate surface faces the upper surface 41 of the heavy floor impact sound reducing layer 40. Is done.

For example, the CLT flooring 2 has a thickness of about 210 mm.
As the cushioning material 3, for example, a material having a thickness of about 10 mm is used.
The ALC plate 4 has a thickness of, for example, about 100 mm.
The plywood 5 has a thickness of about 12.5 mm, for example.

According to the floor structure 1 according to the first embodiment, the ALC board 4 having a higher specific gravity than the CLT flooring 2 is used as the board provided on the floor main layer 20 via the buffer layer 30, and the heavy floor impact sound reducing layer 40 is used. Was formed. That is, the specific gravity of the ALC plate 4 is 0.6 ton / m ³ , while the specific gravity of the CLT flooring 2 is 0.45 ton / m ³ .
Therefore, according to the first embodiment, the heavy floor impact sound reducing layer formed by arranging the plurality of ALC plates 4, 4... Via the buffer layer 30 on the floor main layer 20 having a low sound insulation performance against the heavy floor impact sound. The floor structure 1 which can improve the sound insulation performance against the heavy floor impact sound in the floor structure using the CLT can be provided by the heavy floor impact sound reduction effect by the 40.
In addition, since the construction of the heavy floor impact sound reduction layer 40 formed on the buffer layer 30 can be realized by a dry construction method in which a plurality of ALC plates 4, 4,... The construction period can be shortened compared to the wet construction method in which mortar is poured.
The specific gravity of the ALC plate 4 is 0.6 ton / m ³ , and since it is lightweight, a plurality of ALC plates 4, 4. The operation of forming the reduction layer 40 can be easily performed, and the floor structure 1 can be easily and quickly constructed.
That is, it is possible to provide the floor structure 1 which is a floor structure using the CLT and can reduce the heavy floor impact sound and shorten the construction period.

  Further, since the buffer layer 30 is provided between the upper surface 21 of the floor main layer 20 and the lower surface 42 of the heavy floor impact sound reducing layer 40, the upper surface 21 of the floor main layer 20 and the heavy floor impact sound reducing layer 40 are provided. A small air layer (gap) can be prevented from being formed between the lower layer 42 and the lower surface 42, and the generation of sound due to a resonance phenomenon or the like in the minute air layer can be prevented. It is possible to provide the floor structure 1 in which the sound insulation performance against the heavy floor impact sound is improved in the used floor structure.

  The cushioning material 3 forming the cushioning layer 30 is deformed and restored while receiving the load of the heavy floor impact sound reduction layer 40 and the surface layer 50, and is brought into contact with the upper surface 21 of the floor main layer 20 which is a solid layer. A material capable of closing a minute gap formed between the floor impact noise reduction layer 40 and the lower surface 42, for example, a flexible sheet formed of a synthetic rubber foam, a chemically cross-linked polyethylene resin foam, or the like. Just use it.

Further, a surface layer 50 is formed on the heavy floor impact sound reducing layer 40, and a plywood 5 forming the surface layer 50, an ALC plate 4 forming the heavy floor impact sound reducing layer 40, and a buffer layer are formed using screws 6. Since the cushioning material 3 forming the base material 30 and the CLT flooring material 2 forming the floor main layer 20 are integrated, the floor structure using the CLT further improves the sound insulation performance against heavy floor impact noise. 1 can be provided.
In addition, since the plywood 5, the ALC plate 4, the cushioning material 3, and the CLT floor material 2 are integrated by using the screw 6, displacement of each member can be prevented during an earthquake or the like.
In addition, since the surface layer 50 of the plywood 5 is provided on the heavy floor impact sound reduction layer 40, when the support legs are arranged on the floor structure 1 and a so-called double floor is constructed, the support legs are provided via the support legs. The load can be prevented from being concentrated on the ALC plate 4 of the heavy floor impact noise reduction layer 40, and the ALC plate 4 can be prevented from being cracked.

Embodiment 2
In the first embodiment, the floor structure 1 in which the plywood 5, the ALC plate 4, the cushioning material 3, and the CLT flooring 2 are integrated by using the screws 6, is exemplified. A floor structure in which the plywood 5 and the ALC board 4 are integrated may be used.
In the case of the floor structure according to the second embodiment, the upper layer composed of the heavy floor impact sound reduction layer 40 and the surface layer 50 located above the buffer layer 30 and the floor main layer 20 via the buffer layer 30. Since the structures are independent from each other, the upper layer and the floor main layer 20 swing individually. However, also in the floor structure according to the second embodiment, the provision of the buffer layer 30 causes a minute air layer to be formed between the upper surface 21 of the floor main layer 20 and the lower surface 42 of the heavy floor impact sound reduction layer 40. Can be prevented, and the upper layer and the floor main layer 20 are elastically connected by the buffer layer 30, so that the heavy floor impact noise can be reduced and the construction period can be shortened. A floor structure can be provided.

Embodiment 3
In the first embodiment, the floor structure 1 in which the plywood 5, the ALC plate 4, the cushioning material 3, and the CLT flooring 2 are integrated by using the screw 6 is exemplified, but a plurality of the CLT flooring 2 are formed side by side. A buffer layer 30 is formed on the floor main layer 20, and a plurality of ALC plates 4 are arranged on the buffer layer 30 to form a heavy floor impact sound reduction layer 40. The ALC plate 4, the buffer material 3, and the CLT floor are formed. A floor structure that does not integrate the material 2 may be used.
That is, a floor main layer 20 formed by arranging a plurality of CLT floor members 2, a buffer layer 30 formed on the floor main layer 20, and a heavy floor formed by arranging a plurality of ALC plates 4 on the buffer layer 30. A floor structure including the impact sound reduction layer 40 may be used.
Even with the floor structure according to the third embodiment, since the floor structure using the CLT includes the heavy floor impact sound reduction layer 40 and the buffer layer 30, the heavy floor impact sound can be reduced and the construction period can be shortened. Floor structure that can be provided.

Embodiment 4
Also, a plurality of ALC plates 4 as plate materials are arranged on a floor main layer 20 formed by arranging a plurality of CLT floor materials 2 to form a heavy floor impact noise reduction layer 40, and the ALC plate 4 and the CLT floor material 2 are integrated. The floor structure may not be changed.
That is, a floor structure constituted by a floor main layer 20 formed by arranging a plurality of CLT floor members 2 and a heavy floor impact sound reduction layer 40 formed by arranging a plurality of ALC plates 4 on the floor main layer 20 may also be used. Good.
Even in the floor structure according to the fourth embodiment, since the floor structure using the CLT is provided with the heavy floor impact sound reducing layer 40, the floor structure can reduce the heavy floor impact sound and shorten the construction period. Can be provided.

Embodiment 5
A floor main layer 20 formed by arranging a plurality of CLT floor members 2, a heavy floor impact sound reduction layer 40 formed by arranging a plurality of ALC plates 4 on the floor main layer 20, and a heavy floor impact sound reduction layer 40 A plywood 5 forming the surface layer 50, an ALC plate 4 forming the heavy floor impact sound reduction layer 40, and a CLT flooring 2 forming the floor main layer 20. The floor structure may be configured such that these are integrated by screws 6 as fixing means.
Even in the floor structure according to the fifth embodiment, in the floor structure using CLT, the weight floor impact sound reduction layer 40 is provided, and the plywood 5 forming the surface layer 50 and the heavy floor impact sound are formed using the screws 6. Since the ALC plate 4 forming the reduction layer 40 and the CLT floor material 2 forming the floor main layer 20 are integrated, it is possible to provide a floor structure capable of reducing heavy floor impact noise and shortening the construction period. Become like

In the above description, an example in which the ALC plate 4 having a specific gravity larger than the specific gravity of the CLT floor material 2 is used as the plate material forming the heavy floor impact sound reduction layer 40, but the heavy floor impact sound reduction layer 40 is formed. The plate material may be a plate material formed of a material having a specific gravity greater than that of the CLT floor material 2 (0.45 ton / m ³ ). That is, as the plate forming the heavy floor impact sound reduction layer 40, a plate formed of a material other than ALC, for example, an iron plate (specific gravity 7.85 (ton / m ³ )), a precast concrete plate (specific gravity 2.85) (Ton / m ³ )) or the like.

  In addition, the example in which the plywood 5 is used as the surface plate for forming the surface layer 50 has been described. However, the surface plate for forming the surface layer 50 may be a plate other than the plywood as long as the plate can fasten the screw 6. No problem.

1 floor structure, 2 CLT floor material (floor material), 3 cushioning material, 4 ALC board (plate material),
5 plywood (surface plate), 6 screws (fixing means), 20 floor main layer, 30 buffer layer,
40 weight floor impact sound reduction layer, 50 surface layer.

Claims (5)

  A floor main layer formed by arranging a plurality of floor materials formed by orthogonal laminated plates, and a heavy floor impact noise reduction layer formed by arranging a plurality of plate materials having a specific gravity greater than the specific gravity of the floor material on the floor main layer. A floor structure comprising:   With a surface layer formed by arranging a plurality of surface plates on the heavy floor impact sound reduction layer, a surface plate forming the surface layer, a plate material forming the heavy floor impact sound reduction layer, and a floor material forming the floor main layer The floor structure according to claim 1, wherein are integrated by fixing means.   The floor structure according to claim 1, wherein a buffer layer is provided between an upper surface of the floor main layer and a lower surface of the heavy floor impact sound reducing layer.   A surface layer formed by arranging a plurality of surface plates on the heavy floor impact noise reduction layer, a surface plate forming the surface layer, a plate material forming the heavy floor impact noise reduction layer, and a cushioning material and a floor forming the buffer layer The floor structure according to claim 3, wherein the floor material forming the main layer is integrated by a fixing means.   The floor structure according to any one of claims 1 to 4, wherein the plate material is a lightweight cellular concrete plate.

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