JP4014727B2 - Laminate floor mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is superior acoustic performance, in particular, to a floor mounting structure advantageous laminate is used as a surface material for undercoat when configuring the floor of the building.
[0002]
[Prior art]
When a building is constructed by a frame construction method, a closed air layer is formed under the floor.
[0003]
The floor in a wooden frame structure is generally composed of floor joists with a spacing of 1800mm, or multiple joists with a spacing of 300mm to 450mm between the floor beams and joists. A structural plywood defined in JAS having a thickness of 9 to 15 mm as a floor base material, a particle board defined in JIS, or a structural panel defined in JAS (hereinafter referred to as the above) The structural plywood, particle board, and structural panel are collectively referred to as “structural plywood” and the like, and the structural plywood is fixed by a nail or a screw. In addition, the ceiling is fixed to the existing floor beams or existing joists with nails, etc., and the lower part is fixed to the field edge receiver. The fiberboard, plywood, gypsum board, etc. are stretched around the field. In such a floor structure, a closed air layer of 400 mm to 600 mm is formed under the floor.
[0004]
In addition, the floor in a steel frame structure is constructed by laying multiple joists with gaps of 300mm to 450mm between large beams or small beams, and fixing structural plywood etc. to the joists with nails or screws. It is configured. In addition, the ceiling is provided with a fishing-tree support between the large beam or the small beam, the upper part of the fishing tree is fixed to the fishing-tree support with a nail or the like, and the lower part is fixed to the field edge receiver. It is constructed by laying in a lattice shape and stretching a fiberboard or plywood gypsum board as a ceiling surface material. In such a floor structure, a closed air layer of 400 mm to 600 mm is formed under the floor.
[0005]
Furthermore, the upper surface in the reverse beam method (the method of supporting a fixed load in such a way that the beam is suspended by connecting a concrete slab to the lower end of the beam) that may be implemented in reinforced concrete construction The floor is supported on the upper part of the large beam and the small beam that are the reverse beams at intervals of 900 mm or less, and the joists are laid on it at intervals of 300 mm to 450 mm to form a lattice-like floor material support surface, A structural plywood having a thickness of 9 mm to 15 mm as a floor base surface material is fixed on the floor material support surface with nails or screws. In such a floor structure, a closed air layer of 400 mm to 1000 mm is formed between the upper floor and the concrete slab.
[0006]
[Problems to be solved by the invention]
As described above, when there is a large space under the floor of a building, when a person living on the floor generates noise or impact sound, this sound may resonate in the space. In particular, the sound absorption coefficient of structural plywood, etc. is 10% or less at all frequencies, and the reverberant sound of the air layer under the floor tends to remain as reverberant sound, and this reverberant sound is uncomfortable for the residents under the floor or under the floor. There is a problem of fear.
[0007]
In particular, in the case of the reverse beam method, the underfloor reverberation sound tends to remain as resonance or reverberation because a larger underfloor space is formed with a higher degree of sealing than a conventional wooden frame structure or steel structure. There is a nature. For this reason, when structural plywood or the like is used as a floor base material in the floor structure of the reverse beam method, the reverberation sound in the room when a resident walks or steps is normal S structure (steel structure), RC structure (Reinforced concrete structure) and SRC structure (steel-framed reinforced concrete structure) are further enlarged, and there is a risk of giving uncomfortable feeling to residents on the floor.
[0008]
In order to reduce the above reverberant sound, fiber-based sound absorbing material such as glass wool may be laid on the back of the ceiling in the case of a wooden frame structure or steel structure, or on the concrete slab under the floor in the case of the reverse beam method. is there. However, in this case, it takes time to lay the sound absorbing material, and in the case of the reverse beam method, the problem arises that the underfloor cannot be used for facility installation or underfloor storage.
[0009]
For this reason, the actual situation is that development of a floor base material having high sound absorption performance that can be applied to a building having a structure in which a large space is formed under the floor is required.
[0010]
An object of the present invention is to provide a floor mounting structure for a laminate that can reduce reverberation sound in a room when employed when carrying out a construction method in which a large space is formed under the floor, particularly a reverse beam construction method. It is in.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the floor mounting structure of the laminate according to the present invention is formed by laminating a sheet-like material in which a plurality of plant stems having a skin portion mainly composed of lignocellulose and a porous medulla are arranged side by side. A laminated body in which a surface material is integrated and a plurality of groove-like perforations that reach the medulla is formed is arranged in a large line with the groove-like perforations on the lower side .
[0012]
In the floor mounting structure of the laminate, a predetermined strength is obtained by laminating a predetermined number of sheet-like objects in which a skin portion mainly composed of lignocellulose and a plant stem having a porous medulla are arranged and integrated with each other. A panel capable of exhibiting the function as a floor base material having a surface can be configured. In addition, by forming a groove-like perforation reaching the medulla, the cross section of the plant stem can be exposed to the space under the floor, thereby improving the sound absorption characteristics and reducing the echo sound.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the above-described laminated floor mounting structure will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a laminate, and FIG. 2 is a perspective view illustrating a floor structure by a reverse beam method using the laminate according to the present embodiment.
[0014]
The layered product A according to the present embodiment is configured as a floor base material used when configuring the floor of the first floor or the upper floor, and the dimensions corresponding to the module dimensions of the building whose plane dimensions are set in advance. It is formed in a panel shape with
[0015]
Laminate A laminates a predetermined number of sheets 1 in which a plurality of plant stems having a skin portion mainly composed of lignocellulose and a porous medulla are integrated in parallel, on at least one side (in this embodiment, both sides). The surface material 2 is integrated, and a groove-shaped perforation 3 reaching the medulla is further formed.
[0016]
As the plant stem constituting the sheet 1, sugarcane, corn, rice, wheat, bamboo, and the like can be selectively used. However, it is preferable to use a sorghum with a stalk whose skin is hard and straight and from which a long raw material can be collected. In this embodiment, the sheet 1 is produced using the sorghum stalk.
[0017]
The surface material 2 does not specifically limit the material. That is, as the surface material 2, it is possible to use a 1 mm to 5 mm veneer (a veneer lace, slicer or veneer saw thinly cut wood), especially for the purpose of improving the nail holding power, etc. It is also possible to use gypsum board and the like.
[0018]
Then, the sorghum stalk, which is the raw material, is compressed, and then the compressed stalk is impregnated with an adhesive and dried. The stalk is bundled in a bowl shape to form a sheet 1, and the sheet 1 is laminated again and bonded. In addition, a predetermined number of sheets 1 and the surface material 2 can be integrated by bonding a surface material to both surfaces of the laminated sheets 1 and performing a hot-pressing process using steam.
[0019]
Adhesives used when constructing the sheet 1 by adhering plant stems, and adhesives for adhering the surface material 2 to the laminated sheets 1 are urea adhesives used when manufacturing plywood, urea melamine It is possible to selectively use an adhesive such as a system adhesive, a phenol adhesive, or an isocyanate adhesive.
[0020]
When using sorghum stalk as the raw material of the laminate A, the specific gravity can be set in the range of 0.25 to 0.50 by appropriately setting the amount of adhesive or the compression ratio at the time of hot plate pressing. It is possible to change the structural characteristics such as bending strength and bending Young's modulus corresponding to the above.
[0021]
Also, the sheet 1 is laminated in three or more layers, and the directions of the stems in the respective sheets 1 are alternately crossed to cancel the direction of the fibers, so that the laminated body is supported in any direction. Therefore, it can be preferably used as a floor base material.
[0022]
The cut surface of the plant stem constituting the sheet 1 is excellent in sound absorption, and particularly exhibits a sound absorption rate of 60% to 80% in a frequency range of 500 Hz to 1000 Hz which is most easily felt by humans. Therefore, it is possible to improve the sound absorption characteristics by forming perforations that reach the medullary portion of the plant stem of the sheet 1 laminated in a predetermined number and exposing the cut surface of the plant stem to the lower floor side.
[0023]
For this reason, the laminated body A is configured by laminating a plurality of sheets 1 and integrating the surface material 2 and then forming a plurality of groove-shaped perforations 3 on one surface. The groove-shaped perforations 3 have a groove width of 1 mm to 50 mm, a depth of 1/10 to 9/10 of the thickness of the laminate A, and a total area of 1/2000 to 1/2 of the laminate A. The condition is set.
[0024]
In the laminate A in which the groove-shaped perforations 3 are formed as described above, the cut surface of the plant stem is exposed to the under-floor space by allowing the surface on which the groove-shaped perforations 3 are formed to face the under-floor space. It is possible to improve the sound absorption characteristics depending on the surface and reduce the echo sound.
[0025]
As shown in FIG. 2, the laminate A configured as described above is supported by placing a large draw 13 on the upper part of the beam 12 of the reverse beam method formed integrally with the concrete slab 11. By laying the groove-shaped perforations 3 on the pull 13 as the lower side, it can be used as a floor base material instead of a structural plywood or the like.
[0026]
When the layered product A is used as a floor base material, the cut surface of the plant stem is exposed to a space formed under the floor, and it is possible to absorb and reduce the reverberation sound in the space. In particular, it is possible to reduce the reverberant sound without filling the floor with a fiber-based sound absorbing material such as glass wool, and it is possible to reduce the labor required for filling the sound absorbing material. In addition, when the floor structure is based on the reverse beam method, the reverberation can be reduced more effectively because the air layer under the floor is highly sealed.
[0027]
Next, a comparison of sound absorption rates will be described. A sheet 1 having a thickness of 10 mm and a specific gravity of 0.15 is formed in parallel with the stalks of coriander. The sheet 1 is coated with 150 g / m ^{2 of an} adhesive made of an isocyanate resin, and five sheets are laminated. After stacking 1.5 mm thick poplar face material as No. ² , it is supplied to a hot plate press and pressed at a temperature of 150 ° C. and a pressure of 9 kgf / cm ² for 5 minutes to 20 minutes. A laminated material having a thickness of 30 mm was formed, and a laminate A was constructed by forming a large number of perforations with a diameter of 8 mm, a depth of 10 mm, and a pitch of 22 mm on one surface of the material.
[0028]
Using the laminate A as a sample, the sound absorption coefficient was measured according to “JISA1405 normal incidence sound absorption coefficient measurement method”. As a result of this measurement, the sound absorption coefficient at 1000 Hz was 83%.
[0029]
The following panel was formed and compared with the laminate A of this example as described above.
[0030]
Comparative Example 1 The material for forming the layered product A of this example, that is, five sheets 1 formed by juxtaposing sorghum stems, and the surface material 2 is integrated on the surface, the perforation is performed. The sound absorption coefficient was measured by the above measurement method for those not formed. As a result of this measurement, the sound absorption coefficient was 4%.
[0031]
Comparative Example 2 Perforated plywood specified by JAS with Lawan as a single plate, with a thickness of 30 mm and the same conditions as the laminate A according to the above example (diameter: 8 mm, depth: 10 mm, pitch: 22 mm) Further, the sound absorption coefficient was measured by the above measurement method. As a result of this measurement, the sound absorption coefficient was 16%.
[0032]
Comparative Example 3 The sound absorption coefficient was measured by the above measuring method for the same common plywood as in Comparative Example 2 with no perforations. As a result of this measurement, the sound absorption rate was 3%.
[0033]
As described above, it was found that the sound absorption coefficient is remarkably improved by forming a plurality of perforations, as is apparent from the comparison of the sound absorption coefficient of the laminate A according to this example and Comparative Example 1.
[0034]
In Comparative Example 2, a plurality of perforations were formed as in this example, but no significant improvement in the sound absorption rate was observed as in this example. The difference between the two results from the fact that Comparative Example 2 is an ordinary plywood made of lauan as a single plate, whereas this example uses plant stems as a raw material.
[0035]
The laminate A exhibits very good sound absorption characteristics, and is effective when used as a floor base material for a floor in which a large air layer is formed under the floor.
[0036]
【The invention's effect】
As explained in detail above, in the laminate constituting the floor mounting structure of the laminate according to the present invention, the sheet-like body formed by arranging the plant stems in parallel is laminated, and the surface material is integrated on at least one side, Since the groove-like perforations reaching the medulla are formed, the cut surface of the plant stem is exposed, the sound absorbing property of the cut surface can be exhibited, and the predetermined strength can be exhibited. Therefore, when used as a floor base material having a structure in which a large air layer is formed under the floor, reverberant sound can be reduced by absorbing reverberant sound acting on the air layer.
[0037]
Therefore, it is not necessary to construct a special sound absorbing material under the floor, and it is possible to save the labor of construction and to make effective use of the space formed under the floor. For example, the number of floor storages that can be installed increases.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a laminated body.
FIG. 2 is a perspective view for explaining a floor structure by a reverse beam method using a laminate according to the present embodiment.
[Explanation of symbols]
A Laminate 1 Sheet 2 Surface material 3 Grooved perforation
11 Concrete slab
12 Beam
13

Claims (1)

A plurality of grooved perforations in which a surface material is integrated on at least one side and a plurality of grooved perforations reaching the medulla are laminated by laminating a plurality of plant stems having a skin part mainly composed of lignocellulose and a porous medulla. A floor mounting structure for a laminated body, characterized in that the laminated body formed with the above is laid out in a large line with groove-like perforations on the bottom .

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