JP2000080754A - Construction of wooden core board and floor construction therewith - Google Patents
Construction of wooden core board and floor construction therewithInfo
- Publication number
- JP2000080754A JP2000080754A JP10316558A JP31655898A JP2000080754A JP 2000080754 A JP2000080754 A JP 2000080754A JP 10316558 A JP10316558 A JP 10316558A JP 31655898 A JP31655898 A JP 31655898A JP 2000080754 A JP2000080754 A JP 2000080754A
- Authority
- JP
- Japan
- Prior art keywords
- moisture
- board
- resistant layer
- paper
- core board
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010276 construction Methods 0.000 title 2
- -1 polyethylene Polymers 0.000 claims abstract description 8
- 239000002023 wood Substances 0.000 claims abstract description 8
- 229920005672 polyolefin resin Polymers 0.000 claims abstract description 7
- 239000004743 Polypropylene Substances 0.000 claims abstract description 4
- 229920001155 polypropylene Polymers 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 229920013716 polyethylene resin Polymers 0.000 claims 1
- 239000000123 paper Substances 0.000 abstract description 11
- 229920001577 copolymer Polymers 0.000 abstract description 7
- 239000002245 particle Substances 0.000 abstract description 5
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 abstract description 4
- 239000005977 Ethylene Substances 0.000 abstract description 4
- 239000004698 Polyethylene Substances 0.000 abstract description 4
- 229920000573 polyethylene Polymers 0.000 abstract description 4
- 229920002367 Polyisobutene Polymers 0.000 abstract description 2
- 239000002655 kraft paper Substances 0.000 abstract description 2
- 229920001748 polybutylene Polymers 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 229920000098 polyolefin Polymers 0.000 abstract 2
- 229920005989 resin Polymers 0.000 abstract 2
- 239000011347 resin Substances 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 239000011120 plywood Substances 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 229920002522 Wood fibre Polymers 0.000 description 2
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 2
- 239000002025 wood fiber Substances 0.000 description 2
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 1
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Landscapes
- Panels For Use In Building Construction (AREA)
- Floor Finish (AREA)
- Laminated Bodies (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は木質系芯材ボードの
構造に関するものであり、さらに詳しくは、強度はもち
ろんのこと、耐湿性に優れた木質系芯材ボードの構造に
係るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a wooden core board, and more particularly, to a structure of a wooden core board excellent in moisture resistance as well as strength.
【０００２】[0002]
【従来の技術】近年、熱帯雨林の破壊に歯止めをかける
との理由で、南洋材の主要産出国が木材の伐採規制を強
めており、この結果、合板の価格やその供給が不安定に
なり、パーティクルボード、木質系繊維ボード等への代
替の必要性が高まっている。しかるに、かかる木質系芯
材ボード類は、強度や寸法安定性、耐水性等の種々の性
状が合板等と比較して劣るため、そのボードの使用範囲
は限定されたものとなっていた。以下、建築用部材とし
て用いられる例をもってさらに詳しく説明することとす
るが、例えば、近年、体育館等の床スラブ上に敷設され
る置床にこれらの木質系芯材ボードが用いられている。
しかるに、体育館内での各種イベントの開催時には超重
量物が置床上に置かれることがある。このような荷重に
対して十分な強度、剛性をもつ置床が要求されることは
当然である。そこで、木質系芯材ボード等の両面に合板
を貼ることにより、強度、剛性を得ていた。2. Description of the Related Art In recent years, major producers of southern timber have been tightening restrictions on the cutting of timber in order to halt the destruction of tropical rainforests, which has led to instability in the price and supply of plywood. There is an increasing need to substitute for particle board, wood fiber board and the like. However, such wood-based core boards are inferior in various properties, such as strength, dimensional stability, and water resistance, as compared with plywood or the like, so that the use range of the boards is limited. Hereinafter, the present invention will be described in more detail with reference to examples used as architectural members. For example, in recent years, these wood-based core boards have been used for floors laid on floor slabs of gymnasiums and the like.
However, when various events are held in the gymnasium, an extremely heavy object may be placed on the floor. Naturally, a floor having sufficient strength and rigidity is required for such a load. Therefore, strength and rigidity have been obtained by attaching plywood to both sides of a wooden core board or the like.
【０００３】[0003]
【発明が解決しようとする課題】合板は吸湿性を有する
ため、木質系芯材ボードまでも吸湿し、結果、ボード全
体に、伸び、縮み、反り等の現象がでて、寸法安定性が
得られない。Since the plywood has a hygroscopic property, the plywood absorbs even the wood-based core board, and as a result, phenomena such as elongation, shrinkage, and warping appear on the entire board, and dimensional stability is obtained. I can't.
【０００４】この発明は、強度はもちろんのこと、耐湿
性に優れた木質系芯材ボードの構造を提供することを目
的とする。An object of the present invention is to provide a structure of a wooden core board excellent in moisture resistance as well as strength.
【０００５】[0005]
【課題を解決するための手段】上述の目的を達成するた
め、この発明は、ボード本体の少なくとも片側表面に耐
湿層を有する木質系芯材ボードの構造において、耐湿層
が、２枚の紙の間にポリオレフィン系樹脂からなるシー
トが挟まれているものからなり、あるいは鉄板からなる
ものである。また、上記木質系芯材ボードを耐湿層を下
側にして下地パネルとし、これら下地パネルを互いに間
隔をあけて支持板上に載置し、各支持板には床スラブか
ら所定の間隔をあけて下地パネルを支持する支持脚を設
けたものである。In order to achieve the above object, the present invention relates to a wooden core board having a moisture-resistant layer on at least one surface of a board body, wherein the moisture-resistant layer is made of two sheets of paper. It is made of a sheet in which a sheet made of polyolefin resin is interposed, or made of an iron plate. Further, the wooden core board is used as a base panel with the moisture-resistant layer on the lower side, and these base panels are placed on a support plate at intervals from each other, and each support plate is spaced from the floor slab by a predetermined distance. And supporting legs for supporting the base panel.
【０００６】[0006]
【発明の実施の形態】以下にこの発明の好適な実施例に
ついて図面を参照にして説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.
【０００７】図１に示す実施例の断面図において、木質
系のボード本体１の両面に耐湿層１０を形成してある。
ボード本体１は、パーティクルボード、木質系繊維ボー
ド、木毛セメントボード、ＯＳＢ（オリエンティッドス
トランドボード）等が用いられる。耐湿層１０は、２枚
の紙２の間にポリオレフィン系樹脂からなるシート３を
挟んだ積層物で透湿抵抗値１００ｇ／ｍ２・２４ｈ以下
のものが好ましい。紙２としては、クラフト紙のように
表面がざらついている紙が滑らず作業性が良いために適
している。前記ポリオレフィン系樹脂からなるシート２
としては、ポリエチレン，ポリプロピレン，ポリブテン
−１，ポリイソブチレン，ポリ４−メチル−１−ペンテ
ン，エチレン・酢酸ビニル共重合体，エチレン・エチル
アクリレート共重合体，エチレン・プロピレン共重合
体，エチレン・プロピレン・ジエン共重合体（ＥＰＤ
Ｍ），エチレン・ブテン共重合体，エチレン・ブテン・
ジエン共重合体等が好適に使用でき、特に防湿性及び価
格などの点から好ましくはポリエチレンまたはポリプロ
ピレンのシートである。シート２の厚みは、１０〜３０
μｍ程度が好ましい。In the sectional view of the embodiment shown in FIG. 1, a moisture-resistant layer 10 is formed on both sides of a wooden board body 1.
As the board body 1, a particle board, a wood fiber board, a wood wool cement board, an OSB (Oriented Strand Board) or the like is used. The moisture-resistant layer 10 is preferably a laminate having a sheet 3 made of a polyolefin resin sandwiched between two sheets of paper 2 and having a moisture-permeation resistance of 100 g / m 2 · 24 h or less. The paper 2 is suitable because paper having a rough surface such as kraft paper does not slip and has good workability. Sheet 2 made of the polyolefin resin
Examples include polyethylene, polypropylene, polybutene-1, polyisobutylene, poly-4-methyl-1-pentene, ethylene / vinyl acetate copolymer, ethylene / ethyl acrylate copolymer, ethylene / propylene copolymer, ethylene / propylene / Diene copolymer (EPD
M), ethylene / butene copolymer, ethylene / butene /
A diene copolymer or the like can be suitably used, and a polyethylene or polypropylene sheet is particularly preferable in terms of moisture resistance and cost. The thickness of the sheet 2 is 10 to 30
It is preferably about μm.
【０００８】図示する実施例では、ボード本体１の両面
に耐湿層１０を形成したが、この耐湿層１０はボード本
体１の片面であってもよい。なおまた、ボード本体１と
紙２との間にシート３と同様のものを介在させても差し
支えない。In the illustrated embodiment, the moisture-resistant layers 10 are formed on both sides of the board body 1, but the moisture-resistant layers 10 may be on one side of the board body 1. In addition, the same thing as the sheet 3 may be interposed between the board body 1 and the paper 2.
【０００９】図示する実施例において、ボード本体１と
パーティクルボードを使用し、紙２として目付量２３ｇ
／ｍ２のものを使用し、シート３として目付量１６ｇ／
ｍ２のポリエチレンを使用し、次の方法によりボード本
体１に耐湿層１０を形成した。すなわち、ボード本体１
の表面に酢酸ビニル系接着剤を塗布し、その上から耐湿
層１０を積層し圧着する。In the embodiment shown, a board body 1 and a particle board are used, and a paper 2 has a basis weight of 23 g.
/ M 2 , and the sheet 3 has a basis weight of 16 g /
Using the polyethylene m 2, and to form a moisture resistant layer 10 to the board main body 1 by the following method. That is, the board body 1
A vinyl acetate-based adhesive is applied to the surface of the substrate, and a moisture-resistant layer 10 is laminated thereon and pressed.
【００１０】耐湿層１０が形成されたボード本体１の側
面（木口）には、撥水性材料や防水性材料を塗布してお
くことが好ましく、このような塗布を施しておくことに
よりさらに耐湿性能に優れたものとなる。塗布材料とし
ては、ＳＢＲ、パラフィン、アクリル系樹脂、ウレタン
系樹脂、エポキシ系樹脂などが好適に用いられる。It is preferable that a water-repellent material or a waterproof material is applied to the side surface (kiguchi) of the board body 1 on which the moisture-resistant layer 10 is formed. It will be excellent. As a coating material, SBR, paraffin, acrylic resin, urethane resin, epoxy resin and the like are preferably used.
【００１１】図２に示す別の実施例は、耐湿層１０とし
て鉄板４を用いたものを示す。鉄板４はウレタン系接着
剤でボード本体１の表面に接着され、その厚みは０．１
０〜０．３０mmである。この実施例では、０．１７mmの
鉄板４を使用した。また、鉄板４はボード本体１の両側
の表面に設けることもできる。FIG. 2 shows another embodiment in which an iron plate 4 is used as the moisture-resistant layer 10. The iron plate 4 is bonded to the surface of the board body 1 with a urethane-based adhesive, and has a thickness of 0.1.
0 to 0.30 mm. In this example, a 0.17 mm iron plate 4 was used. Further, the iron plate 4 can be provided on both surfaces of the board body 1.
【００１２】図３は、ボード本体１の下側の表面に耐湿
層１０を形成したものを下地パネルとし、これら下地パ
ネルを支持脚５と支持板６とで床スラブ２０から所定の
間隔をあけて支持した例を示す。下地パネル同士は互い
に隙間をあけて支持板６上に載置される。支持脚５の下
端にはゴム等の緩衝材７を設け、この緩衝材７が床スラ
ブ２０に接地している。また、支持脚５の外周にはねじ
が切られ、このねじ部分がレベル調整用ナット８にねじ
込まれている。ナット８は支持板６に固着してあり、ナ
ット８の上端開口から露出し、下地パネル間の隙間から
顔をのぞかせた支持脚５の上端には溝５Ａが形成されて
いて、この溝５Ａにドライバーを差し込んで支持脚５を
いずれか一方に回転させることにより下地パネルのレベ
ル調整を図ることができるようになっている。また、支
持板６はパーティクルボードや合板あるいはプラスチッ
ク材料で形成され、その上面すなわち下地パネルと接触
する面にゴムシートや粘着シートを貼り付けておいても
よい。また、支持板６の下面には上述の耐湿層１０を設
けることができる。さらに、低床構造のものでは、支持
脚５自体を緩衝材７とすること、すなわち支持脚５の全
体をゴム等で形成することもできる。FIG. 3 shows a base panel in which a moisture-resistant layer 10 is formed on the lower surface of the board body 1, and these base panels are spaced apart from the floor slab 20 by supporting legs 5 and supporting plates 6. The following is an example of support. The base panels are placed on the support plate 6 with a gap therebetween. At the lower end of the support leg 5, a cushioning material 7 such as rubber is provided, and the cushioning material 7 is grounded to the floor slab 20. A screw is cut on the outer periphery of the support leg 5, and this screw portion is screwed into the level adjusting nut 8. The nut 8 is fixed to the support plate 6, is exposed from the upper end opening of the nut 8, and is formed with a groove 5A at the upper end of the support leg 5 from which the face is seen through the gap between the base panels. The level of the base panel can be adjusted by inserting a screwdriver and rotating the support leg 5 in either direction. Further, the support plate 6 may be formed of a particle board, a plywood or a plastic material, and a rubber sheet or an adhesive sheet may be pasted on an upper surface thereof, that is, a surface in contact with the base panel. Further, the above-described moisture-resistant layer 10 can be provided on the lower surface of the support plate 6. Further, in the case of a low floor structure, the support leg 5 itself can be made of the cushioning material 7, that is, the entire support leg 5 can be formed of rubber or the like.
【００１３】図４は、図３に示す例の平面図であり、長
方形状の下地パネルの四隅と長手方向の中間部分を支持
板６で支持し、夫々下地パネルをその短い辺が揃わない
ようにずらして配置してある。これら下地パネル上に
は、通常捨張材を貼り、その上に仕上材を貼る。なお、
支持板６の形状は四角形のみならず円形その他の形状で
あってもよい。FIG. 4 is a plan view of the example shown in FIG. 3, in which four corners and a middle part in the longitudinal direction of a rectangular base panel are supported by a support plate 6 so that the base panel does not have short sides aligned. It is staggered. Usually, a disposing material is pasted on these base panels, and a finishing material is pasted thereon. In addition,
The shape of the support plate 6 is not limited to a square, but may be a circle or any other shape.
【００１４】図３及び図４に示すような床構造にこの発
明の木質系芯材ボードを用いた場合、床下からの湿気は
耐湿層１０により防ぐことができ、ボード本体１の吸湿
による弊害を防止できる。When the wooden core board of the present invention is used for the floor structure as shown in FIGS. 3 and 4, moisture from under the floor can be prevented by the moisture-resistant layer 10, and the adverse effect due to the moisture absorption of the board body 1 can be prevented. Can be prevented.
【００１５】[0015]
【発明の効果】以上説明したように、この発明によれ
ば、ボード本体の少なくとも片側表面に耐湿層を有し、
耐湿層は２枚の紙の間にポリオレフィン系樹脂からなる
シートが挟まれているものあるいは鉄板なので、十分な
強度を有し、耐湿性が向上して寸法安定性に優れる。As described above, according to the present invention, the board body has a moisture-resistant layer on at least one surface thereof,
Since the moisture-resistant layer is a sheet in which a sheet made of a polyolefin-based resin is sandwiched between two sheets of paper or an iron plate, it has sufficient strength, has improved moisture resistance, and has excellent dimensional stability.
【図１】この発明の好適な実施例を示す断面図。FIG. 1 is a sectional view showing a preferred embodiment of the present invention.
【図２】他の実施例を示す断面図。FIG. 2 is a sectional view showing another embodiment.
【図３】床構造に適用した例を示す断面図。FIG. 3 is a cross-sectional view showing an example applied to a floor structure.
【図４】図３の平面図。FIG. 4 is a plan view of FIG. 3;
１ ボード本体 ２ 紙 ３ シート ４ 鉄板 １０ 耐湿層 1 Board body 2 Paper 3 Sheet 4 Iron plate 10 Moisture resistant layer
───────────────────────────────────────────────────── フロントページの続き (72)発明者 片野 治之 神奈川県横浜市泉区下飯田町1777 (72)発明者 小沢 輝司郎 神奈川県横浜市泉区岡津2136 (72)発明者 青木 勢 東京都小平市小川東町３−５−５ Ｆターム(参考） 2E162 CA05 CB02 CC05 CC06 CC08 CD09 4F100 AB02E AK04C AK07C AK08 AK25 AK51 AK53 AK68 AP03A AP10A BA02 BA03 BA04 BA05 BA07 BA10A BA10B BA10D BA10E DG10B DG10D EC18 GB07 JD04 JD04E JK01 JL04 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Haruyuki Katano 1777, Shimoiida-cho, Izumi-ku, Yokohama-shi, Kanagawa Prefecture (72) Inventor Terujiro Ozawa 2136, Okazu, Izumi-ku, Yokohama-shi, Kanagawa Prefecture 3-5-5 Ogawahigashicho F term (reference) 2E162 CA05 CB02 CC05 CC06 CC08 CD09 4F100 AB02E AK04C AK07C AK08 AK25 AK51 AK53 AK68 AP03A AP10A BA02 BA03 BA04 BA05 BA07 BA10A BA10B BA10D BA10E DG10J04 GB18 J04 GB10E
Claims (5)
層を有する木質系芯材ボードの構造において、 耐湿層が、２枚の紙の間にポリオレフィン系樹脂からな
るシートが挟まれているものからなることを特徴とする
木質系芯材ボードの構造。1. A wood core board structure having a moisture-resistant layer on at least one surface of a board body, wherein the moisture-resistant layer comprises a sheet of polyolefin resin sandwiched between two sheets of paper. A wooden core board structure characterized by the following.
レン樹脂またはポリプロピレンであることを特徴とする
請求項１に記載の木質系芯材ボードの構造。2. The structure of the wood-based core board according to claim 1, wherein the polyolefin-based resin is a polyethylene resin or polypropylene.
層を有する木質系芯材ボードの構造において、 耐湿層が鉄板からなることを特徴とする木質系芯材ボー
ドの構造。3. The structure of a wooden core board having a moisture-resistant layer on at least one surface of the board body, wherein the moisture-resistant layer is made of an iron plate.
層を下側にして下地パネルとし、 これら下地パネルを支持板上に載置し、各支持板には床
スラブから所定の間隔をあけて下地パネルを支持する支
持脚を設けたことを特徴とする床構造。4. The wood-based core board according to claim 1, wherein said board is placed on a support plate with a moisture-resistant layer facing down, and said support panel is placed on a support plate at a predetermined distance from a floor slab. A floor structure characterized by providing support legs for supporting the base panel with an opening.
脚を床スラブと下地パネルとの間隔を調整できるように
構成したことを特徴とする請求項４に記載の床構造。5. The floor structure according to claim 4, wherein the support leg includes at least a cushioning material, and the support leg is configured to adjust a distance between the floor slab and the base panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10316558A JP2000080754A (en) | 1997-11-07 | 1998-11-06 | Construction of wooden core board and floor construction therewith |
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32246597 | 1997-11-07 | ||
| JP9-322465 | 1998-07-08 | ||
| JP19339898 | 1998-07-08 | ||
| JP10-193398 | 1998-07-08 | ||
| JP10316558A JP2000080754A (en) | 1997-11-07 | 1998-11-06 | Construction of wooden core board and floor construction therewith |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000080754A true JP2000080754A (en) | 2000-03-21 |
Family
ID=27326759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10316558A Pending JP2000080754A (en) | 1997-11-07 | 1998-11-06 | Construction of wooden core board and floor construction therewith |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000080754A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012031686A (en) * | 2010-08-02 | 2012-02-16 | Panasonic Electric Works Co Ltd | Flooring |
| JP2015059331A (en) * | 2013-09-18 | 2015-03-30 | 株式会社 Ｕｆｇ | Double-floor structure and its construction method |
-
1998
- 1998-11-06 JP JP10316558A patent/JP2000080754A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012031686A (en) * | 2010-08-02 | 2012-02-16 | Panasonic Electric Works Co Ltd | Flooring |
| JP2015059331A (en) * | 2013-09-18 | 2015-03-30 | 株式会社 Ｕｆｇ | Double-floor structure and its construction method |
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