JP3823950B2

JP3823950B2 - Building wall exterior construction structure

Info

Publication number: JP3823950B2
Application number: JP2003184928A
Authority: JP
Inventors: 士郎高木; 博文伊野; 博油原
Original assignee: Nichiha Corp
Current assignee: Nichiha Corp
Priority date: 2003-06-27
Filing date: 2003-06-27
Publication date: 2006-09-20
Anticipated expiration: 2023-06-27
Also published as: JP2005016226A

Description

【０００１】
【技術分野】
本発明は，建築物の外壁材として施工する建築板であって，特に木目調の凹凸模様を形成した意匠表面に塗装を行って形成した建築板の外壁施工構造に関する。
【０００２】
【従来技術】
建築物の外壁として施工するために量産される建築板においては，単調な仕上り感を避けるために，建築板の意匠表面に形成する凹凸模様の形状の工夫，この意匠表面に行う塗装の仕方の工夫等がなされている。
そして，例えば，特許文献１においては，建築板の意匠表面に複数の凹溝を形成し，この複数の凹溝のうちの少なくとも１つの凹溝の傾斜側面は，残りの凹溝の傾斜側面とは異なる模様に形成している。そして，光が照射されたときの反射状態がすべての凹溝では等しくなく，見る方向によって意匠外観が異なる建築板を形成している。
【０００３】
また，特許文献２においては，建築板の意匠表面に複数の単位波形による断面波形模様を形成し，単位波形の一方の側面を急斜面に他方の側面を緩斜面に形成している。そして，各単位波形における急斜面と緩斜面とを形成する方向を一定させず，急斜面及び緩斜面をランダムに形成することによって，立体的で面白味のある意匠外観を呈する建築板を形成している。
【０００４】
【特許文献１】
特許第２９５７５６６号公報
【特許文献２】
特開２０００−２３４４３０号公報
【０００５】
【解決しようとする課題】
しかしながら，上記特許文献１の建築板においては，上記複数の凹溝は，建築板の一方向に沿って並ぶ帯状に形成されており，上記建築板は，単調な凹凸外観を呈している。また，上記複数の凹溝のうちの上記異なる模様を有する傾斜側面は，複数の凹溝の一部に形成していると共に，その形成方向が一定していない。そのため，特許文献１の建築板によっては，特殊な陰影効果を発揮し，木目調をリアルに再現した意匠外観を呈することはできない。
【０００６】
また，上記特許文献２の建築板においても，複数の単位波形は，建築板の一方向に沿って並ぶ帯状に形成されており，上記建築板は，単調な凹凸外観を呈している。また，各単位波形における急斜面と緩斜面との形成方向が一定していない。そのため，特許文献２の建築板によっても，特殊な陰影効果を発揮し，木目調をリアルに再現した意匠外観を呈することはできない。
【０００７】
本発明は，かかる従来の問題点に鑑みてなされたもので，微細な陰影効果も加わった縞状の陰影効果を発揮することができ，木目調をリアルに再現した意匠外観を呈することができる建築板の外壁施工構造を提供しようとするものである。
【０００８】
【課題の解決手段】
参考発明は，木目調を呈するための複数の木目形成凸部を形成してなる原板の表面に，塗料層を設けてなる建築板において，
上記各木目形成凸部は，上記木目調の形成方向に直交する直交方向断面において，それぞれ上記建築板の一方端側に位置する一方側壁面よりも，他方端側に位置する他方側壁面が緩やかな緩傾斜状に形成されており，
上記一方側壁面は微細凹凸を有する粗面に形成されており，また，上記他方側壁面は略平滑な平滑面に形成されており，
上記木目形成凸部の頂点部から谷部までの高さは，１〜２．５ｍｍであり，上記微細凹凸の深さは，０．３〜１ｍｍであり，
上記各木目形成凸部は，上記建築板の長手方向に沿って形成されていることを特徴とする建築板にある。
【０００９】
上記木目調とは，樹木を挽いた断面において，この樹木の内部に形成された年輪による外観とほぼ同様の外観もしくはこれに近似した外観のことをいう。また，上記木目調の形成方向とは，この木目調が表現しようとする樹木の長手方向（樹木が伸びる方向）のことをいう。
【００１０】
本発明の建築板においては，上記各木目形成凸部は，上記建築板の一方端側に位置する一方側壁面よりも，他方端側に位置する他方側壁面が緩やかな緩傾斜状に形成されている。そして，各木目形成凸部における一方側壁面は，上記建築板の一方端側を向く明確な方向性を有して形成されている。
そのため，上記建築板に光が照射されたときには，各木目形成凸部における各一方側壁面と各他方側壁面とに照射される光の反射の仕方が異なり，建築板の意匠表面に，明確な方向性を有する縞状の陰影効果を発揮させることができる。
【００１１】
さらに，本発明の建築板においては，各木目形成凸部における各一方側壁面は，多数の微細凹凸を有する粗面に形成されており，各他方側壁面は，略平滑な平滑面に形成されている。そのため，各一方側壁面においては，照射された光が上記微細凹凸によって乱反射を行う一方，各他方側壁面においては，照射された光がほとんど乱反射を行わない。これにより，各一方側壁面には，例えば切削加工を行った木材の表面のような木材特有の微細な陰影効果を発揮させることができる。
それ故，本発明の建築板は，上記微細な陰影効果も加わった縞状の陰影効果を発揮することができ，木目調をリアルに再現した意匠外観を呈することができる。
【００１２】
本発明は，木目調を呈するための複数の木目形成凸部を形成してなる原板の表面に塗料層を設けてなる建築板を，建築物の構造躯体に取り付けてなる建築板の外壁施工構造において，
上記建築板における各木目形成凸部は，上記木目調の形成方向に直交する直交方向断面において，それぞれ上記建築板の一方端側に位置する一方側壁面よりも，他方端側に位置する他方側壁面が緩やかな緩傾斜状に形成されており，また，上記一方側壁面は微細凹凸を有する粗面に形成されており，上記他方側壁面は略平滑な平滑面に形成されており，
かつ，上記建築板は，上記各一方側壁面が上向きになるよう建築物の構造躯体に取り付けられていることを特徴とする建築板の外壁施工構造にある（請求項１）。
【００１３】
本発明の建築板の外壁施工構造は，上記微細な陰影効果も加わった縞状の陰影効果を発揮し，木目調をリアルに再現した意匠外観を呈する建築板を，外壁材として，建築物の構造躯体に取り付けてなる。そして，この建築板は，その各木目形成凸部における各一方側壁面が上向きになるよう取り付けている。
【００１４】
そのため，上記上向きに配された各木目形成凸部における各一方側壁面には，太陽光による光が照射され易く，一方で，下向きに配された各木目形成凸部における各他方側壁面には，太陽光による光が照射され難い状態を形成することができる。これにより，各一方側壁面における微細凹凸が乱反射を行う状態が一層顕著になり，上記微細な陰影効果を一層顕著に発揮することができる。
それ故，本発明の建築板の外壁施工構造によれば，上記微細な陰影効果が顕著に加わった縞状の陰影効果を発揮することができ，木目調をリアルに再現した意匠外観を呈することができる建築物の外壁を形成することができる。
【００１５】
【発明の実施の形態】
上述した本発明における建築板の外壁施工構造にかかる好ましい実施の形態につき説明する。
本発明において，上記建築板としては，例えば量産を行う無機質建築板がある。また，無機質建築板としては，例えば窯業系建築板がある。
また，上記塗料層は，上記原板の表面に塗装した下塗り層と，この下塗り層の表面に塗装した上塗り層とにより形成することができる。また，上記塗料層の最表面には，耐候性，耐透水性等を向上させるためのクリアー層を形成することができる。
【００１６】
本発明において，上記建築板における塗料層は，単色の塗料からなることが好ましい（請求項２）。
この場合には，上記塗料層の形成が容易であり，上記建築板の製造も容易である。そして，上記建築板における特殊な陰影効果は，塗料層によらず，上記各木目形成凸部における一方側壁面と他方側壁面との形状によって発揮することができる。
また，この場合には，上記建築板の外壁施工構造は，上記単色の塗料からなる塗料層が形成された建築板によって，上記特殊な陰影効果を発揮することができる。
【００１７】
また，上記建築板における複数の木目形成凸部は，上記木目調における板目部分と柾目部分とを形成してなることが好ましい（請求項３）。
この場合には，上記建築板は，上記微細な陰影効果も加わった縞状の陰影効果を発揮することができ，木目調を一層リアルに再現した意匠外観を呈することができる。
また，この場合には，上記建築板の外壁施工構造においても，上記微細な陰影効果も加わった縞状の陰影効果を発揮することができ，木目調を一層リアルに再現した意匠外観を呈することができる建築物の外壁を形成することができる。
【００１８】
【実施例】
以下に，図面を用いて本発明の建築板の外壁施工構造にかかる実施例につき説明する。
（実施例１）
本例の建築板１は，図１〜図３に示すごとく，木目調２０３を呈するための複数の木目形成凸部２１を形成してなる原板２の表面に，塗料層３を設けてなる。
上記各木目形成凸部２１は，上記木目調２０３の形成方向（長手方向）Ｌに直交する直交方向Ｗの断面において，それぞれ上記建築板１の一方端側Ｄ１に位置する一方側壁面２１１よりも，他方端側Ｄ２に位置する他方側壁面２１２が緩やかな緩傾斜状に形成されている。
【００１９】
また，上記各木目形成凸部２１における各一方側壁面２１１は，多数の微細凹凸２３を有する粗面に形成されており，各他方側壁面２１２は，略平滑な平滑面に形成されている。また，上記木目形成凸部２１同士の間には，谷部２２が形成されている。
以下に，これを詳説する。
【００２０】
図１〜図３に示すごとく，本例の建築板１は，量産可能な窯業系建築板１でありながら，木材を挽いたときの切断面の外観に近似した木目調２０３の凹凸外観を有するものである。
図１，図２は，上記建築板１を，上記木目調２０３の形成方向（長手方向）Ｌに直交する直交方向Ｗにおいて切断して観察した断面説明図である。また，図３は，建築板１の意匠表面１０１を観察した平面図である。
【００２１】
上記各木目形成凸部２１は，上記建築板１が表現しようとする木材（樹木）における年輪の晩材部を表現するものであり，上記各谷部２２は，上記年輪の早材部を表現するものである。上記早材部とは，１年間に形成される１年輪において，春から初夏にかけて樹木の成長が早い時期にできる部分をいい，上記晩材部とは，初夏以後，樹木の生長が緩やかな時期にできる部分をいう。
【００２２】
そして，本例の各木目形成凸部２１は，上記年輪の外観を呈する木材（樹木）において，晩材部の硬さが早材部の硬さよりも硬いことに対応して，原板２の表面に突出形成したものである。
また，上記各木目形成凸部２１における一方側壁面２１１を形成した側である建築板１の一方端側Ｄ１は，上記複数の木目形成凸部２１により表現しようとする木目調２０３のモデルになった樹木４０の中心Ｏ，すなわち樹木の髄Ｏのある側としている（図４参照）。
【００２３】
また，図１，図２に示すごとく，上記各木目形成凸部２１における一方側壁面２１１及び他方側壁面２１２は，いずれも傾斜状に形成されており，一方側壁面２１１の傾斜角度は他方側壁面２１２の傾斜角度よりも急に形成されている。すなわち，一方側壁面２１１は急な急傾斜状に形成されており，他方側壁面２１２は一方側壁面２１１よりも緩やかな緩傾斜状に形成されている。
そして，上記傾斜角度の違いに応じて，上記建築板１の直交方向Ｗの断面における上記他方側壁面２１２の幅は，上記一方側壁面２１１の幅よりも広くなっている。
【００２４】
また，上記各木目形成凸部２１は，上記直交方向Ｗの断面において，それぞれ上記建築板１の一方端側Ｄ１に位置する急傾斜状の一方側壁面２１１と，他方端側Ｄ２に位置する緩傾斜状の他方側壁面２１２とが合わさった山形形状に形成されている。そして，直交方向Ｗの断面において，各木目形成凸部２１の頂点部２１０は，緩やかな円弧状に形成されている。
【００２５】
また，各木目形成凸部２１においては，上記一方端側Ｄ１を向くいずれの一方側壁面２１１も急傾斜状に形成されており，上記他方端側Ｄ２を向くいずれの一方側壁面２１２も緩傾斜状に形成されている。そして，一方側壁面２１１と他方側壁面２１２とが対になって木目形成凸部２１を形成しており，建築板１の意匠表面１０１は，急傾斜状の一方側壁面２１１と緩傾斜状の他方側壁面２１２とが交互に配された波状表面を形成している。
【００２６】
本例の建築板１の意匠表面１０１は，図５に示すような早材部４１２よりも硬さの硬い晩材部４１１が傾斜突出してなる木材４の表面４０１を転写して，形成したものである。そのため，建築板の意匠表面１０１においては，急傾斜状の一方側壁面２１１→緩傾斜状の他方側壁面２１２→急傾斜状の一方側壁面２１１→緩傾斜状の他方側壁面２１２・・・というように急傾斜面と緩傾斜面とが必ず交互に形成されている。
【００２７】
また，上記多数の微細凹凸２３は，上記急傾斜状の一方側壁面２１１に形成されているだけでなく，若干は上記緩傾斜状の他方側壁面２１２にも引き続いて形成されている。そして，この微細凹凸２３の深さは，例えば０．３〜１ｍｍとすることができる。なお，この深さが０．３ｍｍ未満であると，切削加工を行った木材の表面のような木材特有の微細な陰影効果を発揮できないおそれがあり，１ｍｍを越えると，微細凹凸２３が欠損してしまうおそれがある。
また，上記他方側壁面２１２における略平滑な平滑面は，完全な平滑面ではなく，上記原板２を構成する原料中に含まれる成分による極微細な凹凸（ざらつき感）を有している。
【００２８】
また，図２に示すごとく，上記木目形成凸部２１が上記谷部２２から突出する突出高さＨ１，すなわち木目形成凸部２１の頂点部２１０から谷部２２までの高さＨ１は，例えば，１〜２．５ｍｍとすることができる。本例では，この突出高さＨ１は，約２ｍｍとした。なお，この高さＨ１が１ｍｍ未満であると，建築板１の意匠表面１０１に縞状の陰影効果を発揮できなくなるおそれがあり，２．５ｍｍを越えると，木目形成凸部２１が欠損してしまうおそれがある。
【００２９】
また，上記各木目形成凸部２１が上記建築板１の裏面１０２から突出する意匠表面突出高さＨ２，すなわち建築板１の裏面１０２から各木目形成凸部２１の頂点部２１０までの高さ（建築板１の厚み）Ｈ２は，木目形成凸部２１全体でほぼ同一の高さ（厚み）となっている。なお，建築板１の厚みＨ２は，適宜選択することができる。
【００３０】
図４は，樹木４０をこれが伸びる長手方向Ｌに沿って挽いたときに，その切断断面に現れる外観を示す図である。そして，上記建築板１の意匠表面１０１において表現する木目調２０３は，同図に示すごとく，樹木４０の中心（髄）Ｏからずれた位置Ｘ１で挽いたときに現れる板目部分２０４と柾目部分２０５とが混在する外観であって，板目部分２０４の途中から柾目部分２０５にかけての切断断面の片側部分の外観を表現するものである。
これ以外にも，上記木目調２０３は，樹木４０の中心（髄）Ｏの位置Ｘ０又はその近傍の位置Ｘ０を通って挽いたときに現れる柾目部分２０５のみの外観であって，柾目部分２０５の切断断面の片側部分の外観を表現することもできる。
【００３１】
こうして，図１．図３に示すごとく，上記複数の木目形成凸部２１は，上記木目調２０３における板目部分２０４と柾目部分２０５とを形成している。
そして，図３に示すごとく，上記柾目部分２０５における各木目形成凸部２１は，上記木目調２０３の形成方向Ｌに向けて，波状に曲がった長尺状に形成されている。また，柾目部分２０５における互いに隣接する木目形成凸部２１は，上記木目調２０３の形成方向Ｌに向けて，互いに平行に近い状態で形成されている。また，上記板目部分２０４における木目形成凸部２１は，上記木目調２０３の形成方向Ｌに向けて，波状に曲がった帯状に形成されている。
【００３２】
また，上記板目部分２０４における木目形成凸部２１同士の間の間隔は，上記柾目部分２０５における木目形成凸部２１同士の間の間隔よりも広くなっている。本例では，上記柾目部分２０５における木目形成凸部２１同士の間の間隔は，１〜１５ｍｍとなっており，上記板目部分２０４における木目形成凸部２１同士の間の間隔は，１５ｍｍ以上となっている。
【００３３】
また，図１，図３に示すごとく，上記建築板１の意匠表面１０１には，上記木目形成凸部２１による木目調２０３を形成した木目調形成領域２５と，この木目調形成領域２５よりも陥没した目地溝２６とが形成されている。また，本例の目地溝２６は，縦目地溝として上記建築板１の長手方向Ｌに沿って形成した。なお，上記目地溝２６は，上記縦目地溝と，これに直交する直交方向Ｗに沿って形成した横目地溝とにより構成してもよい。
【００３４】
また，本例においては，上記木目調形成領域２５毎に，上記木目調２０３の板目部分２０４と木目調２０３の柾目部分２０５とを形成した。すなわち，各木目調形成領域２５における上記建築板１の一方端側Ｄ１に近い部分には，上記複数の木目形成凸部２１により上記板目部分２０４を形成し，残りの部分には，上記複数の木目形成凸部２１により上記柾目部分２０５を形成した。
すなわち，各木目調形成領域２５においても，上記直交方向Ｗの断面において，建築板１の一方端側Ｄ１に位置する各一方側壁面２１１は急傾斜状に形成し，他方端側Ｄ２に位置する各他方側壁面２１２は緩傾斜状に形成し，かつ微細凹凸２３は各一方側壁面２１１に形成した。
【００３５】
また，図２に示すごとく，本例の建築板１における塗料層３は，シーラー塗装による下塗り層３１と，この下塗り層３１の表面に形成した単色の塗料からなる上塗り層３２とを有してなる。そして，上記建築板１は，上記複数の木目形成凸部２１を形成した原板２の表面に，上記下塗り層３１を形成し，この下塗り層３１の表面に上記上塗り層３２を形成してなる。
そして，本例の建築板１は，上記上塗り層３２の色外観によらず，上記各木目形成凸部２１における各一方側壁面２１１と各他方側壁面２１２との形状によって，特殊な陰影効果を発揮することができるものである。
【００３６】
次に，上記建築板１を製造する方法につき説明する。
上記建築板１を製造するに当たっては，まず，これを型成形（フォーミング）するための成形型を製作する。
すなわち，板目部分と柾目部分との木目調の年輪の外観を呈する木材を準備し，この木材の表面を所定の圧力を加えた状態で切削する。このとき，木材の各年輪における晩材部は，硬いためにあまり削り取られず，一方で，早材部は，晩材部よりも軟らかいために多く削り取られる。
【００３７】
そして，晩材部が山形状に突出し，この晩材部における上記木材の中心（髄）Ｏ側（図４参照）に位置する側壁面は急傾斜状に形成され，反対側に位置する側壁面は緩傾斜状に形成される。その後，上記晩材部が突出した木材の表面をさらに所定の圧力で切削することにより，晩材部の急傾斜状の側壁面に微細な凹凸を形成される。
こうして，上記切削加工を行った木材のモデルを製作し，このモデルの切削表面を転写して成形型を製作することができる。
【００３８】
そして，以下の型成形及び塗装を行って原板２の表面に塗料層３を設けてなる建築板１を量産することができる。
すなわち，上記原板２を成形するに当たっては，上記成形型内に，セメント質原料（セメント，ケイ酸原料等）に木質原料（木繊維，木チップ等），添加剤及び水等を混合してなる混合原料を散布する。そして，上記成形型により原板２としてのセメント系原板２を成形し，これを上記成形型から取り出す。そして，このセメント系原板２の表面には，成形型の成形面により，上記粗面に形成された一方側壁面２１１と上記平滑面に形成された他方側壁面２１２とを有する複数の木目形成凸部２１が形成される。
【００３９】
次いで，上記セメント系原板２の表面に，シーラー塗装を行って下塗り層３１を形成し，この下塗り層３１の表面に単色の塗料を塗装して上塗り層３２を形成する。その後，上塗り層３２の表面に，耐候性，耐透水性等を向上させるためのクリアー塗料を塗装してクリアー層を形成し，上記建築板１を製造することができる。
【００４０】
上記のようにして製造した建築板１においては，上記各木目形成凸部２１は，上記建築板１の一方端側Ｄ１に位置する各一方側壁面２１１が急傾斜状に形成されており，他方端側Ｄ２に位置する各他方側壁面２１２が緩傾斜状に形成されている。そして，各木目形成凸部２１における各一方側壁面２１１は，上記建築板１の一方端側Ｄ１を向く明確な方向性を有して形成されている。
そのため，上記建築板１に光が照射されたときには，各木目形成凸部２１における各一方側壁面２１１と各他方側壁面２１２とに照射される光の反射の仕方が異なり，建築板１の意匠表面１０１に，明確な方向性を有する縞状の陰影効果を発揮させることができる。
【００４１】
さらに，上記建築板１においては，各木目形成凸部２１における各一方側壁面２１１は，多数の微細凹凸２３を有する粗面に形成されており，各他方側壁面２１２は，略平滑な平滑面に形成されている。そのため，各一方側壁面２１１においては，照射された光が上記微細凹凸２３によって乱反射を行う一方，各他方側壁面２１２においては，照射された光がほとんど乱反射を行わない。これにより，各一方側壁面２１１には，例えば切削加工を行った木材の表面のような木材特有の微細な陰影効果を発揮させることができ，建築板１の意匠表面１０１における艶が目立たなくすることができる。
【００４２】
また，上記各一方側壁面２１１は，上記多数の微細凹凸２３を形成した粗面により，木材の表面をプレーナにより切削加工したときに生ずる逆目彫りの毛羽立ったような質感を表現することができる。また，上記各一方側壁面２１１における多数の微細凹凸２３が乱反射を行うため，建築板１の意匠表面１０１に生ずる艶を少なくすることができる。
【００４３】
そのため，上記各一方側壁面２１１に多数の微細凹凸２３を設けた形状により，艶消し効果を発揮することができ，上記上塗り層３２を構成する塗料に含有させる艶消し材の量を少なくすることができる。
それ故，上記建築板１は，上記微細な陰影効果も加わった縞状の陰影効果を発揮することができる。また，上記建築板１は，木材が風化したときに得られるような意匠外観を呈することができ，木目調２０３をリアルに再現することができる。
【００４４】
また，上記建築板１の表面に表現される色外観は，上記単色の塗料からなる上塗り層３２により表現されている。そのため，上記建築板１の表面に表現される色外観は単色であるにも拘らず，上記複数の木目形成凸部２１により，上記特殊な陰影効果を発揮することができる。
また，上記建築板１は，上記上塗り層３２は単色の塗料から形成しているため，多色の塗料の塗り分けや，掻取り等は行っていない。
そのため，上記上塗り層３２の形成が容易であり，上記建築板１の製造も容易である。そのため，上記優れた作用効果を有する建築板１を効率よく量産することができる。
【００４５】
また，後述する実施例２に示すように，本例の建築板１は，上記一方端側Ｄ１を上向きに，すなわち各木目形成凸部２１の各一方側壁面２１１を上向きにして，建築物の外壁を形成することを想定している。
そして，図６に示すごとく，太陽光Ｙによる照射が急傾斜状の各他方側壁面２１２にだけでなく緩傾斜状の各一方側壁面２１１にも及んだ状態を，建築板１の下方から観察者Ｇが観察したときに，各他方側壁面２１２においては，光Ｙ２が反射して表面の艶が見え易くなる一方，各一方側壁面２１１においては，光Ｙ１が乱反射して表面の艶がほとんど見えなくなる。
【００４６】
このように，上記建築板１においては，意匠表面１０１における艶の生じ方が一方側壁面２１１と他方側壁面２１２とで大きく異なっている。そのため，上記建築板１は単色塗装を行ったものであるにも拘らず，多色塗装により複数の色彩を表現したかのような外観を呈することができる。そして，上記単色塗装を行った建築板１は，年輪の外観を呈する木材表面における濃淡を表現したかのような外観を呈することができる。
【００４７】
（実施例２）
本例においては，図７に示すごとく，上記実施例１に示した建築板１を，建築物の外壁材として建築物の構造躯体６に取り付けて，建築板１の外壁施工構造を形成した。そして，本例の建築板１の外壁施工構造は，上記各木目形成凸部２１の各一方側壁面２１１が上向きになるよう，複数の建築板１を取り付けてなる。
また，複数の建築板１は，その長手方向Ｌを横向きにした状態で，上方向に向けて隣接配置して，構造躯体６に取り付けられている。そして，各建築板１は，上記急傾斜状で上記微細凹凸２３を有する粗面からなる各一方側壁面２１１が向けられた一方端１０５を上向きに，上記緩傾斜状で上記平滑面からなる各他方側壁面２１２が向けられた他方端１０６を下向きにして取り付けられている。
【００４８】
上記建築板１の一方端１０５には，下実部１１が形成されており，他方端１０６には，上実部１２及び内実部１３が形成されている。また，本例では，建築板１の一方端１０５及び他方端１０６は，上記長手方向Ｌに平行な一対の長尺端部としている。
なお，下実部１１とは，建築板１の裏面１０２側の部分を，建築板１の端部（一方端１０５）からその面方向に向けて突出させてなる部分をいう。また，上実部１２とは，建築板１の意匠表面１０１側の部分を，建築板１の端部（他方端１０６）からその面方向に向けて突出させてなる部分をいう。また，内実部１３とは，上実部１２の裏面１０２側に位置する係止部をいう。
【００４９】
また，互いに上下に隣接配置された下側の建築板１Ａと上側の建築板１Ｂとは，下側の建築板１Ａの下実部１１が上側の建築板１Ｂの内実部１３内に配置され，下側の建築板１Ａの下実部１１の表面を上側の建築板１Ｂの上実部１２で覆って，建築物の構造躯体６に取り付けられている。なお，これらの建築板１の取付は，取付金具６１を用いて行うことができる。
【００５０】
本例の建築板１の外壁施工構造は，上記実施例１に示した優れた作用効果を有する複数の建築板１を，外壁材として建築物の構造躯体６に取り付けてなる。そして，各建築板１は，その各木目形成凸部２１における各一方側壁面２１１が上向きになるよう取り付けられている。そのため，上記上向きに配された各木目形成凸部２１における各一方側壁面２１１には，太陽光Ｙによる光が照射され易く，一方で，下向きに配された各木目形成凸部２１における各他方側壁面２１２には，太陽光Ｙによる光が照射され難い状態を形成することができる。これにより，各一方側壁面２１１における微細凹凸２３が乱反射を行う状態が一層顕著になり，上記微細な陰影効果を一層顕著に発揮することができる。
【００５１】
それ故，本例の建築板１の外壁施工構造によれば，上記微細な陰影効果が顕著に加わった縞状の陰影効果を発揮することができ，木目調２０３をリアルに再現した意匠外観を呈することができる建築物の外壁を形成することができる。
本例においても，その他は上記実施例１と同様であり，上記実施例１と同様の作用効果を得ることができる。
【図面の簡単な説明】
【図１】実施例１における，建築板を示す断面説明図。
【図２】実施例１における，建築板を示す断面拡大説明図。
【図３】実施例１における，建築板を示す平面図。
【図４】実施例１における，樹木を挽いたときの切断断面の状態を示す説明図。
【図５】実施例１における，早材部よりも硬さの硬い晩材部が傾斜突出してなる木材の表面を示す説明図。
【図６】実施例１における，建築板の意匠表面における光の反射状態を示す説明図。
【図７】実施例２における，建築板の外壁施工構造を示す断面説明図。
【符号の説明】
１．．．建築板，
１０１．．．意匠表面，
１０２．．．裏面，
２．．．セメント系原板，
２０３．．．木目調，
２０４．．．板目部分，
２０５．．．柾目部分，
２１．．．木目形成凸部，
２１１．．．一方側壁面，
２１２．．．他方側壁面，
２２．．．谷部，
２３．．．微細凹凸，
３．．．塗料層，
６．．．構造躯体，
Ｄ１．．．一方端側，
Ｄ２．．．他方端側，
Ｌ．．．木目調の形成方向（長手方向），
Ｗ．．．直交方向，[0001]
【Technical field】
  The present invention relates to a building board to be constructed as an outer wall material of a building, and in particular, a building board formed by painting on the surface of a design having a textured pattern of woodgrainofThe outer wall construction structure.
[0002]
[Prior art]
For building boards that are mass-produced for construction as the outer wall of a building, in order to avoid a monotonous finish, the shape of the concavo-convex pattern formed on the design surface of the building board and the method of painting applied to the design surface Ingenuity has been made.
And, for example, in Patent Document 1, a plurality of concave grooves are formed on the design surface of a building board, and the inclined side surfaces of at least one of the plurality of concave grooves are the inclined side surfaces of the remaining concave grooves. Are formed in different patterns. And the reflection state when irradiated with light is not equal in all the concave grooves, and a building board having a different design appearance depending on the viewing direction is formed.
[0003]
Moreover, in patent document 2, the cross-sectional waveform pattern by the several unit waveform is formed in the design surface of a building board, and one side of a unit waveform is formed in a steep slope and the other side is formed in a gentle slope. And the building board which shows the design appearance which is three-dimensional and interesting is formed by not forming the direction which forms the steep slope and the gentle slope in each unit waveform constant, but forming the steep slope and the gentle slope randomly.
[0004]
[Patent Document 1]
Japanese Patent No. 2957566
[Patent Document 2]
JP 2000-234430 A
[0005]
[Problems to be solved]
However, in the building board of the above-mentioned Patent Document 1, the plurality of concave grooves are formed in a strip shape aligned along one direction of the building board, and the building board has a monotonous uneven appearance. Further, the inclined side surface having the different pattern among the plurality of grooves is formed in a part of the plurality of grooves, and the forming direction thereof is not constant. For this reason, depending on the building board of Patent Document 1, it is not possible to exhibit a special shading effect and exhibit a design appearance that realistically reproduces the wood grain.
[0006]
Moreover, also in the building board of the said patent document 2, the some unit waveform is formed in the strip | belt shape arranged along one direction of a building board, and the said building board is exhibiting the monotonous uneven | corrugated external appearance. Also, the formation direction of steep and gentle slopes in each unit waveform is not constant. Therefore, even with the building board of Patent Document 2, it is not possible to exhibit a special shade effect and present a design appearance that realistically reproduces the wood grain.
[0007]
  The present invention has been made in view of such conventional problems, can exhibit a striped shadow effect with a fine shadow effect, and can exhibit a design appearance that realistically reproduces the grain of wood. Building boardofThe outer wall construction structure is to be provided.
[0008]
[Means for solving problems]
  Reference inventionIs a building board in which a paint layer is provided on the surface of an original board formed with a plurality of wood grain forming convex parts for exhibiting a wood grain tone,
  In the cross section in the orthogonal direction perpendicular to the wood grain formation direction, each of the wood grain forming convex portions has a gentler side wall surface located on the other end side than the one side wall surface located on the one end side of the building board. It is formed in a gentle slope,
  The one side wall surface is formed into a rough surface having fine irregularities, and the other side wall surface is formed into a substantially smooth smooth surface,
  The height from the apex portion to the valley portion of the grain forming convex portion is 1 to 2.5 mm, the depth of the fine irregularities is 0.3 to 1 mm,
  Each said grain formation convex part is in the building board characterized by being formed along the longitudinal direction of the said building board.
[0009]
The above-mentioned wood grain tone refers to an appearance that is substantially the same as or similar to the appearance of an annual ring formed inside a tree in a cross-section of a tree. Further, the direction in which the wood grain is formed refers to the longitudinal direction of the tree to be expressed by the wood grain (the direction in which the tree extends).
[0010]
In the building board of the present invention, each of the above-mentioned wood grain forming convex portions is formed such that the other side wall surface located on the other end side has a gentle gentle slope rather than the one side wall surface located on the one end side of the above building board. ing. And the one side wall surface in each grain formation convex part is formed with the clear directionality which faces the one end side of the said building board.
Therefore, when the building board is irradiated with light, the reflection method of the light applied to each one side wall surface and each other side wall surface in each grain-forming convex portion is different, and the design surface of the building board is clearly defined. A striped shadow effect having directionality can be exhibited.
[0011]
Furthermore, in the building board of the present invention, each one side wall surface in each grain-forming convex portion is formed into a rough surface having a large number of fine irregularities, and each other side wall surface is formed into a substantially smooth smooth surface. ing. Therefore, on each side wall surface, the irradiated light is irregularly reflected by the fine irregularities, while on the other side wall surface, the irradiated light hardly performs irregular reflection. Thereby, each one side wall surface can exhibit the fine shading effect peculiar to wood like the surface of the wood which cut, for example.
Therefore, the building board of the present invention can exhibit a striped shadow effect with the above-mentioned fine shadow effect added, and can exhibit a design appearance that realistically reproduces the wood grain.
[0012]
  BookThe invention relates to an external wall construction structure of a building board in which a building board in which a paint layer is provided on the surface of an original board formed with a plurality of wood grain forming convex portions for exhibiting a wood grain tone is attached to a structural frame of a building. ,
  Each grain-forming convex part in the building board is the other side located on the other end side of the side wall surface located on the one end side of the building board in the orthogonal cross section perpendicular to the forming direction of the wood grain. The wall surface is formed in a gentle gentle slope, the one side wall surface is formed into a rough surface having fine irregularities, and the other side wall surface is formed into a substantially smooth and smooth surface.
  And the said building board exists in the outer wall construction structure of the building board characterized by being attached to the structural frame of a building so that each said one side wall surface may become upward (claim)1).
[0013]
The construction structure of the outer wall of the building board according to the present invention exhibits a striped shadow effect with the above-mentioned fine shadow effect added, and a building board having a design appearance that realistically reproduces the grain of wood as an outer wall material. It is attached to the structural housing. And this building board is attached so that each one side wall surface in each wood grain formation convex part may face upward.
[0014]
Therefore, each one side wall surface in each upwardly-arranged grain forming convex portion is easily irradiated with sunlight, while on the other side wall surface in each downwardly-arranged grain forming convex portion, , It is possible to form a state in which light from sunlight is difficult to be irradiated. As a result, the state in which the fine irregularities on each one side wall surface perform irregular reflection becomes more prominent, and the fine shading effect can be exhibited more remarkably.
Therefore, according to the outer wall construction structure of the building board of the present invention, the above-mentioned fine shading effect can be exerted, and the striped shading effect can be exhibited, and the design appearance that realistically reproduces the wood grain tone can be exhibited. The outer wall of the building can be formed.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
  Building board in the present invention described aboveofA preferred embodiment of the outer wall construction structure will be described.
  BookIn the invention, examples of the building board include an inorganic building board for mass production. As an inorganic building board, for example, there is a ceramic building board.
  The paint layer can be formed by an undercoat layer coated on the surface of the original plate and an overcoat layer coated on the surface of the undercoat layer. Moreover, a clear layer for improving weather resistance, water permeation resistance and the like can be formed on the outermost surface of the paint layer.
[0016]
  BookIn the present invention, the paint layer in the building board is preferably composed of a single color paint.2).
  In this case, the coating layer can be easily formed, and the building board can be easily manufactured. And the special shadow effect in the said building board can be exhibited by the shape of the one side wall surface and the other side wall surface in each said grain formation convex part irrespective of a coating layer.
  Moreover, in this case, the outer wall construction structure of the building board can exhibit the special shading effect by the building board on which the paint layer made of the monochrome paint is formed.
[0017]
  Moreover, it is preferable that the several grain formation convex part in the said building board forms the grain part and the mesh part in the said wood grain tone (claim)3).
  In this case, the building board can exhibit a striped shadow effect to which the fine shadow effect is added, and can exhibit a design appearance that more closely reproduces the wood grain.
  In this case, the outer wall construction structure of the building board can also exhibit the striped shadow effect with the fine shadow effect added, and exhibit a design appearance that reproduces the wood grain tone more realistically. The outer wall of the building can be formed.
[0018]
【Example】
  Below, the building board of the present invention is used with the drawings.ofAn embodiment according to the outer wall construction structure will be described.
(Example 1)
  As shown in FIGS. 1 to 3, the building board 1 of this example is provided with a paint layer 3 on the surface of an original board 2 formed with a plurality of wood grain forming convex portions 21 for exhibiting a wood grain 203.
  Each of the wood grain forming convex portions 21 is more than the one side wall surface 211 located on the one end side D1 of the building board 1 in the cross section in the orthogonal direction W perpendicular to the forming direction (longitudinal direction) L of the wood grain tone 203. , The other side wall surface 212 located on the other end side D2 is formed in a gentle gentle slope.
[0019]
In addition, each one side wall surface 211 of each of the grain forming convex portions 21 is formed into a rough surface having a large number of fine irregularities 23, and each other side wall surface 212 is formed into a substantially smooth smooth surface. In addition, valleys 22 are formed between the grain-forming convex portions 21.
This is described in detail below.
[0020]
As shown in FIGS. 1 to 3, the building board 1 of this example is a ceramic building board 1 that can be mass-produced, but has an uneven appearance with a wood grain 203 that approximates the appearance of a cut surface when wood is ground. Is.
1 and 2 are cross-sectional explanatory views of the building board 1 observed by cutting in the orthogonal direction W orthogonal to the forming direction (longitudinal direction) L of the wood grain 203. FIG. 3 is a plan view of the design surface 101 of the building board 1 observed.
[0021]
Each said grain formation convex part 21 expresses the late-wood part of the annual ring in the timber (tree) which the said building board 1 intends to express, and each said trough part 22 expresses the early part of the said annual ring. To do. The early wood part refers to the part of the annual ring formed in one year that can be grown early from the spring to early summer, and the late part is the period when tree growth is slow after early summer. The part that can be made.
[0022]
And each wood grain formation convex part 21 of this example respond | corresponds to the hardness of a late-wood part being harder than the hardness of an early-wood part in the timber (tree) which shows the external appearance of the above-mentioned annual ring. It is formed by protruding.
In addition, one end D1 of the building board 1 which is the side on which the one side wall surface 211 is formed in each of the wood grain forming convex portions 21 is a model of the wood grain 203 to be expressed by the plurality of wood grain forming convex portions 21. The center O of the tree 40, that is, the side where the marrow O of the tree is located (see FIG. 4).
[0023]
As shown in FIGS. 1 and 2, the one side wall surface 211 and the other side wall surface 212 of each of the grain forming convex portions 21 are formed in an inclined shape, and the inclination angle of the one side wall surface 211 is the other side. It is formed steeper than the inclination angle of the wall surface 212. That is, the one side wall surface 211 is formed in a steep and steeply inclined shape, and the other side wall surface 212 is formed in a gentler and slanted shape than the one side wall surface 211.
And according to the difference of the said inclination angle, the width | variety of the said other side wall surface 212 in the cross section of the orthogonal direction W of the said building board 1 is wider than the width | variety of the said one side wall surface 211. FIG.
[0024]
Further, each of the grain-forming convex portions 21 has a steeply inclined one side wall surface 211 located on one end side D1 of the building board 1 and a gentle position located on the other end side D2 in the cross section in the orthogonal direction W. It is formed in a chevron shape with the other side wall surface 212 of the inclined shape. And in the cross section of the orthogonal direction W, the vertex part 210 of each grain formation convex part 21 is formed in the gentle circular arc shape.
[0025]
Moreover, in each grain formation convex part 21, any one side wall surface 211 facing the said one end side D1 is formed in steep inclination, and any one side wall surface 212 facing the said other end side D2 is also gently inclined. It is formed in a shape. And the one side wall surface 211 and the other side wall surface 212 are paired to form the wood grain forming convex portion 21, and the design surface 101 of the building board 1 has a steeply inclined one side wall surface 211 and a gently inclined shape. A wavy surface is formed in which the other side wall surface 212 is alternately arranged.
[0026]
The design surface 101 of the building board 1 of this example is formed by transferring the surface 401 of the wood 4 in which the late lumber part 411 having a hardness harder than the early lumber part 412 as shown in FIG. It is. Therefore, on the design surface 101 of the building board, the steeply inclined one side wall surface 211 → the gently inclined other side wall surface 212 → the steeply inclined one side wall surface 211 → the gently inclined other side wall surface 212. Thus, the steeply inclined surface and the gently inclined surface are always formed alternately.
[0027]
Further, the large number of fine irregularities 23 are formed not only on the steeply inclined one side wall surface 211 but also on the other side wall surface 212 having a slightly inclined shape. And the depth of this fine unevenness | corrugation 23 can be 0.3-1 mm, for example. If the depth is less than 0.3 mm, the fine shading effect peculiar to wood such as the surface of the cut wood may not be exhibited. If it exceeds 1 mm, the fine unevenness 23 is lost. There is a risk that.
Further, the substantially smooth smooth surface on the other side wall surface 212 is not a perfect smooth surface but has extremely fine irregularities (roughness) due to components contained in the raw material constituting the original plate 2.
[0028]
Further, as shown in FIG. 2, the protrusion height H <b> 1 at which the wood grain forming convex portion 21 protrudes from the valley portion 22, that is, the height H <b> 1 from the vertex portion 210 to the valley portion 22 of the grain forming convex portion 21 is, for example, It can be 1 to 2.5 mm. In this example, the protrusion height H1 is about 2 mm. In addition, when this height H1 is less than 1 mm, there is a possibility that the striped shadow effect cannot be exhibited on the design surface 101 of the building board 1, and when it exceeds 2.5 mm, the grain-forming convex portion 21 is lost. There is a risk that.
[0029]
Further, the design surface protrusion height H2 at which each of the wood grain forming convex portions 21 protrudes from the back surface 102 of the building board 1, that is, the height from the back surface 102 of the building board 1 to the apex portion 210 of each wood grain forming convex portion 21 ( The thickness (H2) of the building board 1 is substantially the same height (thickness) in the entire grain forming convex portion 21. In addition, the thickness H2 of the building board 1 can be selected suitably.
[0030]
FIG. 4 is a diagram showing an appearance that appears in the cut section when the tree 40 is ground along the longitudinal direction L in which the tree 40 extends. The wood grain 203 expressed on the design surface 101 of the building board 1 is a grain part 204 and a mesh part appearing when it is ground at a position X1 deviated from the center (medullary) O of the tree 40 as shown in FIG. 205 is an appearance in which 205 is mixed, and expresses the appearance of one side portion of the cut section from the middle of the plate portion 204 to the cell portion 205.
In addition to this, the wood grain 203 is an appearance of only the mesh portion 205 that appears when grinding through the position X0 of the center (medullary) O of the tree 40 or a position X0 in the vicinity thereof, The appearance of one side portion of the cut section can also be expressed.
[0031]
Thus, FIG. As shown in FIG. 3, the plurality of grain formation convex portions 21 form a grain part 204 and a mesh part 205 in the grain tone 203.
As shown in FIG. 3, each grain forming convex portion 21 in the mesh part 205 is formed in a long shape that is bent in a wave shape toward the forming direction L of the grain tone 203. Further, the adjacent grain forming convex portions 21 in the mesh part 205 are formed in a state of being nearly parallel to each other toward the forming direction L of the grain tone 203. Further, the grain forming convex portion 21 in the plate portion 204 is formed in a band shape that is bent in a wave shape toward the forming direction L of the grain tone 203.
[0032]
Further, the interval between the grain formation convex portions 21 in the plate portion 204 is wider than the interval between the grain formation convex portions 21 in the mesh portion 205. In this example, the interval between the grain formation convex portions 21 in the mesh portion 205 is 1 to 15 mm, and the interval between the grain formation convex portions 21 in the plate portion 204 is 15 mm or more. It has become.
[0033]
As shown in FIGS. 1 and 3, the design surface 101 of the building board 1 has a wood grain formation region 25 in which a wood grain 203 is formed by the wood grain formation convex portion 21, and the wood grain formation region 25. A recessed joint groove 26 is formed. Moreover, the joint groove 26 of this example was formed along the longitudinal direction L of the said building board 1 as a vertical joint groove. In addition, you may comprise the said joint groove 26 by the said vertical joint groove and the horizontal joint groove formed along the orthogonal direction W orthogonal to this.
[0034]
Further, in this example, the wood grain portion 203 of the wood grain 203 and the mesh portion 205 of the wood grain 203 are formed for each of the wood grain formation regions 25. That is, the grain portion 204 is formed by the plurality of grain-forming convex portions 21 in the portion close to the one end D1 of the building board 1 in each grain-like formation region 25, and the plurality of the grain-like portions are formed in the remaining portions. The above-mentioned mesh portion 205 was formed by the wood grain forming convex portion 21.
That is, also in each wood grain formation region 25, in the cross section in the orthogonal direction W, each one side wall surface 211 located on one end side D1 of the building board 1 is formed in a steep slope and located on the other end side D2. Each other side wall surface 212 was formed in a gently inclined shape, and the fine irregularities 23 were formed on each one side wall surface 211.
[0035]
As shown in FIG. 2, the paint layer 3 in the building board 1 of this example includes an undercoat layer 31 formed by sealer coating, and an overcoat layer 32 made of a single color paint formed on the surface of the undercoat layer 31. Become. The building board 1 is formed by forming the undercoat layer 31 on the surface of the original plate 2 on which the plurality of wood grain forming convex portions 21 are formed, and forming the overcoat layer 32 on the surface of the undercoat layer 31.
And the building board 1 of this example does not depend on the color appearance of the said top coat layer 32, but has a special shadow effect by the shape of each one side wall surface 211 and each other side wall surface 212 in each said grain formation convex part 21. It can be demonstrated.
[0036]
Next, a method for manufacturing the building board 1 will be described.
In manufacturing the building board 1, first, a forming die for forming (forming) it is manufactured.
That is, a wood having an appearance of a wood-grained annual ring with a grain portion and a mesh portion is prepared, and the surface of the wood is cut with a predetermined pressure applied. At this time, the lumber part in each annual ring of wood is hard and is not cut off much, while the early lumber part is cut off more because it is softer than the late lumber part.
[0037]
And the latewood part protrudes in a mountain shape, and the side wall surface located on the center (medullary) O side (see FIG. 4) of the wood in the late wood part is formed in a steep slope, and the side wall face located on the opposite side Is formed in a gentle slope. Thereafter, the surface of the wood from which the late material portion protrudes is further cut at a predetermined pressure, thereby forming fine irregularities on the steeply inclined side wall surface of the late material portion.
In this way, a wood model subjected to the above-described cutting process can be manufactured, and a molding die can be manufactured by transferring the cutting surface of the model.
[0038]
And the building board 1 which provides the coating layer 3 on the surface of the original plate 2 by performing the following molding and coating can be mass-produced.
That is, when the original plate 2 is molded, a cementitious material (cement, silicic acid material, etc.), a wooden material (wood fiber, wood chip, etc.), an additive, water, and the like are mixed in the mold. Sprinkle mixed ingredients. And the cement-type original plate 2 as the original plate 2 is shape | molded with the said shaping | molding die, and this is taken out from the said shaping | molding die. The cement-based original plate 2 has a plurality of grain-forming projections having a side wall surface 211 formed on the rough surface and a side wall surface 212 formed on the smooth surface by the molding surface of the mold. Part 21 is formed.
[0039]
Next, sealer coating is performed on the surface of the cement base plate 2 to form an undercoat layer 31, and a monochromatic paint is applied to the surface of the undercoat layer 31 to form an overcoat layer 32. Then, the above-mentioned building board 1 can be manufactured by coating the surface of the topcoat layer 32 with a clear paint for improving weather resistance, water permeability, and the like to form a clear layer.
[0040]
In the building board 1 manufactured as described above, each of the wood grain forming convex portions 21 is formed such that each one side wall surface 211 located on one end side D1 of the building board 1 is formed in a steeply inclined shape, and the other Each other side wall surface 212 located on the end side D2 is formed in a gently inclined shape. And each one side wall surface 211 in each wood grain formation convex part 21 has a clear direction which faces one end side D1 of the above-mentioned building board 1.
Therefore, when the building board 1 is irradiated with light, the reflection method of the light irradiated to each one side wall surface 211 and each other side wall surface 212 in each grain forming convex portion 21 is different, and the design of the building board 1 The surface 101 can exhibit a striped shadow effect having a clear direction.
[0041]
Further, in the building board 1, each side wall surface 211 of each grain-forming convex portion 21 is formed into a rough surface having a large number of fine irregularities 23, and each other side wall surface 212 is a substantially smooth smooth surface. Is formed. Therefore, on each side wall surface 211, the irradiated light is irregularly reflected by the fine unevenness 23, while on the other side wall surface 212, the irradiated light hardly performs irregular reflection. As a result, each side wall surface 211 can exhibit a fine shading effect peculiar to wood, such as the surface of wood that has been subjected to cutting, and the gloss on the design surface 101 of the building board 1 becomes inconspicuous. be able to.
[0042]
Further, each of the one side wall surfaces 211 can express the fluffy texture of the reverse engraving generated when the surface of the wood is cut by a planar surface by the rough surface on which the numerous fine irregularities 23 are formed. . Moreover, since many fine unevenness | corrugations 23 in each said one side wall surface 211 perform irregular reflection, the glossiness which arises in the design surface 101 of the building board 1 can be decreased.
[0043]
Therefore, the shape provided with a large number of fine irregularities 23 on each one of the side wall surfaces 211 can exert a matting effect and reduce the amount of matting material contained in the coating material constituting the topcoat layer 32. Can do.
Therefore, the building board 1 can exhibit a striped shadow effect to which the fine shadow effect is added. Moreover, the building board 1 can exhibit a design appearance that can be obtained when wood is weathered, and can reproduce the wood grain 203 realistically.
[0044]
Further, the color appearance expressed on the surface of the building board 1 is expressed by the topcoat layer 32 made of the monochrome paint. Therefore, although the color appearance expressed on the surface of the building board 1 is a single color, the special shading effect can be exhibited by the plurality of wood grain forming convex portions 21.
In the building board 1, the top coat layer 32 is formed of a single color paint, so that the multi-color paint is not separately applied or scraped off.
Therefore, the top coat layer 32 can be easily formed, and the building board 1 can be easily manufactured. Therefore, the building board 1 which has the said outstanding effect can be mass-produced efficiently.
[0045]
Moreover, as shown in Example 2 described later, the building board 1 of the present example has a structure in which the one end D1 faces upward, that is, each side wall surface 211 of each grain forming convex portion 21 faces upward. It is assumed that an outer wall is formed.
Then, as shown in FIG. 6, the state in which the irradiation with sunlight Y reaches not only each steeply inclined side wall surface 212 but also each gently inclined side wall surface 211 from below the building board 1. When the observer G observes, the light Y2 is reflected on each other side wall surface 212 so that the surface gloss is easily seen, while the light Y1 is irregularly reflected on each one side wall surface 211 to cause the surface gloss. Almost disappeared.
[0046]
As described above, in the building board 1, the way the gloss on the design surface 101 is greatly different between the one side wall surface 211 and the other side wall surface 212. Therefore, although the building board 1 has been subjected to a single color coating, it can have an appearance as if a plurality of colors were expressed by the multicolor coating. And the building board 1 which performed the said monochrome coating can exhibit the external appearance as if the gradation on the surface of the wood which exhibits the external appearance of an annual ring was expressed.
[0047]
(Example 2)
In this example, as shown in FIG. 7, the building board 1 shown in the first embodiment was attached to the structural frame 6 of the building as an outer wall material of the building to form the outer wall construction structure of the building board 1. And the exterior wall construction structure of the building board 1 of this example attaches the several building board 1 so that each one side wall surface 211 of each said grain formation convex part 21 may become upward.
In addition, the plurality of building boards 1 are attached to the structural housing 6 so as to be adjacent to each other in the upward direction in a state in which the longitudinal direction L is in the horizontal direction. And each building board 1 is made up of each of the above-mentioned smooth surfaces with the above-mentioned steep slope and the above-mentioned one-side wall surface 211 made of the rough surface having the above-mentioned fine irregularities 23, with the one end 105 facing upward. The other side wall surface 212 is attached with the other end 106 facing downward.
[0048]
A lower solid portion 11 is formed at one end 105 of the building board 1, and an upper solid portion 12 and an inner solid portion 13 are formed at the other end 106. In this example, the one end 105 and the other end 106 of the building board 1 are a pair of long end portions parallel to the longitudinal direction L.
In addition, the lower solid part 11 means the part which protrudes the part by the side of the back surface 102 of the building board 1 toward the surface direction from the edge part (one end 105) of the building board 1. As shown in FIG. Moreover, the upper solid part 12 means the part formed by projecting the part by the side of the design surface 101 of the building board 1 toward the surface direction from the edge part (other end 106) of the building board 1. As shown in FIG. The inner solid part 13 is a locking part located on the back surface 102 side of the upper solid part 12.
[0049]
In addition, the lower building board 1A and the upper building board 1B, which are adjacent to each other vertically, are arranged such that the lower solid part 11 of the lower building board 1A is disposed in the inner solid part 13 of the upper building board 1B. The surface of the lower solid part 11 of the lower building board 1A is covered with the upper solid part 12 of the upper building board 1B, and is attached to the structural frame 6 of the building. In addition, the mounting of these building boards 1 can be performed using the mounting bracket 61.
[0050]
The outer wall construction structure of the building board 1 of this example is formed by attaching the plurality of building boards 1 having the excellent operational effects shown in the first embodiment to the structural frame 6 of the building as outer wall materials. And each building board 1 is attached so that each one side wall surface 211 in each wood grain formation convex part 21 may face upward. Therefore, each one side wall surface 211 in each of the above-described upwardly-arranged grain-forming convex portions 21 is easily irradiated with light from sunlight Y, and on the other hand, each of the other-side of each downward-arranged grain-forming convex portion 21. On the side wall surface 212, a state in which light from sunlight Y is difficult to be irradiated can be formed. Thereby, the state in which the fine unevenness 23 on each one side wall surface 211 performs irregular reflection becomes more prominent, and the fine shading effect can be exhibited more remarkably.
[0051]
Therefore, according to the outer wall construction structure of the building board 1 of this example, the above-mentioned fine shading effect can be exhibited and the striped shading effect can be exhibited, and the design appearance that realistically reproduces the wood grain 203 can be obtained. The outer wall of the building that can be presented can be formed.
Also in this example, the other parts are the same as those in the first embodiment, and the same effects as those in the first embodiment can be obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional explanatory view showing a building board in Example 1. FIG.
2 is an enlarged cross-sectional explanatory view showing a building board in Example 1. FIG.
3 is a plan view showing a building board in Embodiment 1. FIG.
FIG. 4 is an explanatory diagram showing a state of a cut section when a tree is ground in the first embodiment.
FIG. 5 is an explanatory diagram showing the surface of wood in which a late lumber part harder than the early lumber part protrudes in an inclined manner in Example 1.
6 is an explanatory diagram showing a light reflection state on the design surface of a building board in Example 1. FIG.
FIG. 7 is a cross-sectional explanatory view showing an outer wall construction structure of a building board in Example 2.
[Explanation of symbols]
1. . . Building board,
101. . . Design surface,
102. . . Backside,
2. . . Cement base plate,
203. . . Wood grain,
204. . . Plate part,
205. . . The cell part,
21. . . Wood grain convexity,
211. . . One side wall,
212. . . The other side wall surface,
22. . . Tanibe,
23. . . Fine irregularities,
3. . . Paint layer,
6). . . Structural enclosure,
D1. . . One end,
D2. . . The other end,
L. . . Direction of grain formation (longitudinal direction),
W. . . Orthogonal direction,

Claims

In the construction work of the outer wall of the building board, which is constructed by attaching a building board with a paint layer on the surface of the original board formed with a plurality of wood grain forming convex parts for exhibiting a wood grain tone, to the structural frame of the building,
Each grain-forming convex part in the building board is the other side located on the other end side of the side wall surface located on the one end side of the building board in the orthogonal cross section perpendicular to the forming direction of the wood grain. The wall surface is formed in a gentle gentle slope, the one side wall surface is formed into a rough surface having fine irregularities, and the other side wall surface is formed into a substantially smooth and smooth surface.
And the said building board is attached to the structural frame of a building so that each said one side wall surface may become upward, The exterior wall construction structure of the building board characterized by the above-mentioned.

2. The construction structure for an outer wall of a building board according to claim 1, wherein the paint layer in the building board is made of a single color paint.

3. The building wall outer wall construction structure according to claim 1 or 2, wherein the plurality of grain-forming convex portions in the building board form a grain part and a mesh part in the wood grain tone.