JP2004244866A - Road expanding structure and road expanding construction method - Google Patents

Road expanding structure and road expanding construction method Download PDF

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Publication number
JP2004244866A
JP2004244866A JP2003034211A JP2003034211A JP2004244866A JP 2004244866 A JP2004244866 A JP 2004244866A JP 2003034211 A JP2003034211 A JP 2003034211A JP 2003034211 A JP2003034211 A JP 2003034211A JP 2004244866 A JP2004244866 A JP 2004244866A
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Japan
Prior art keywords
road
mountain
retaining wall
valley
floor slab
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JP2003034211A
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Japanese (ja)
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JP3714475B2 (en
Inventor
Osamu Wakabayashi
修 若林
Touzo Yamaguchi
統三 山口
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Nihon Samicon Co Ltd
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Nihon Samicon Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • Y02A30/60Planning or developing urban green infrastructure

Abstract

<P>PROBLEM TO BE SOLVED: To provide a road expanding structure for reducing foundation work for accompanying excavation, and superior in stability. <P>SOLUTION: A concrete floor slab 11 is arranged on a road 1 between a mountain side slope 3 and a valley side slope 2. A retaining wall 21 is arranged on the mountain side Y of the road 1, and a pressing-down part 23 is arranged in this retaining wall 21 for pressing down a mountain side end part 11Y of the concrete floor slab 11 from above. Since the mountain side end part 11Y of the concrete floor slab 11 is pressed down by the retaining wall 21 arranged on the mountain side slope 3, even if an overhang part 14H of a road surface 14 is lengthened, the concrete floor slab 11 is stabilized. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、山側と谷側が傾斜面をなす道路を拡張する道路拡張構造と道路拡張工法に関する。
【0002】
【従来の技術】
従来、この種の道路の拡張には、図11に示すように、道路101の谷側に擁壁102を構築し、この擁壁102の背面と傾斜面103との間に盛土104を充填して道路を拡張する構造や、図12に示すように、傾斜面103にコンクリート製の下部基礎104を形成すると共に、この下部基礎104上に支柱105を立設し、また、既設の道路101の谷側端にコンクリート製の上部基礎106を構築し、前記支柱105と上部基礎106によりコンクリート床版107を張り出して支持する構造等が用いられている(例えば特許公報1)。
【0003】
しかし、上記の盛土104を充填する構造では、擁壁102の下部の基礎部分102Aが大きくなり、この基礎部分102の工事が大掛かりなものになると共に、盛土104による土圧も大きくなるため、大型の擁壁102が必要となる。
【0004】
また、上記のコンクリート床版107を張り出して支持する構造では、既設の道路101の谷側を掘削してここに上部基礎106を構築しなければならないため、幅員の狭い道路1では長期間道路を全面通行止めにしないと工事を行うことができない。さらに、水平状態のコンクリート床版107を張り出して設けるものであるため、支柱105位置より谷側に張り出した部分に加わる荷重に対して十分な強度を得るためには、上部基礎106を大きく形成し、この上部基礎106にコンクリート床版107を強固に連結しなければならない。
【0005】
一方、道路の山側の傾斜面を削って道路を山側に拡張する方法もあるが、掘削及び発生残土の処理などが煩雑となる。
【0006】
上記図11及び図12の構造では、谷側の傾斜面における施工が主となり、これに対し、既設の道路側の施工を主とする構造として、斜面に既設された道路を、斜面の谷側に拡幅した道路であって、既設道路の山側端および谷側端に、それぞれ道路の延長方向に所定間隔で打設した、複数の基礎杭の頭部を桁で結合した基礎桁を設置し、該基礎桁は、既設道路の谷側端外側へ向けて水平に延びる張出し桁を有し、該張出し桁上に床版を載置してなる拡幅道路(例えば特許公報2)や、 既設道路の谷側に、道路進行方向に沿って地中支持体を形成し、山側には道路進行方向に沿って地中にカウンターウエイトを形成し、このカウンターウエイトに端部を固定したコンクリート床版を道路進行方向と交差する方向に設置して中間部を地中支持体によって支え、床版の谷側部分を既設道路から張り出すようにコンクリート床版を連続して並べた道路拡張工法(例えば特許公報3)がある。
【0007】
【特許文献1】
特開平10−88504号公報(図6,図7)
【特許文献2】
特開平10−227002号公報
【特許文献3】
特開平5−156601号公報
【0008】
【発明が解決しようとする課題】
上記特許公報2の拡張道路及び特許公報3の道路拡張工法は、いずれも既設の道路の大掛かりな掘削や杭打ち作業が必要となる。また、拡張道路の安定性のためには、特許公報2では山側の基礎杭をできるだけ山側に近づけることが好ましく、特許公報3ではカウンターウエートを山側に近づけることが好ましいが、既設道路を掘削あるいは杭打ちする工法では、それら基礎杭及びカウンターウエートの施工位置に制約を受けるため、基礎杭及びカウンターウエートを山側に近づけようとしても一定の限界がある。
【0009】
そこで、本発明は、掘削を伴う基礎工事などを軽減でき、安定性に優れた道路拡張構造と道路拡張工法を提供することを目的とする。
【0010】
【課題を解決するための手段】
請求項1の発明は、山側傾斜面と谷側傾斜面の間の道路に路面構成部材を設け、該路面構成部材の谷側端部を谷側に張り出して拡張する道路拡張構造において、前記道路の山側に人工構造物を設け、この人工構造物に前記路面構成部材の山側端部を上から押える押さえ部を設けたものである。
【0011】
この請求項1の構成によれば、山側に設けた人工構造物により、路面構造部品の山側端部が押えられるから、張り出し部分を長くしても、路面構造部品の安定化を図ることができる。特に、山側端部の上を押える構造であるから、既設道路の掘削作業などが不要で、山側に近い位置で路面構成部材の端部に荷重を加えることができる。
【0012】
また、請求項2の発明は、前記人工構造物が前記山側傾斜面に設けた擁壁である。
【0013】
この請求項2の構成によれば、山側傾斜面の擁壁を利用して路面構成部材の山側を押えることにより、路面構成部材による安定性した張り出し構造が得られる。
【0014】
また、請求項3の発明は、前記人工構造物を前記山側傾斜面に連結する連結手段を備えるものである。
【0015】
この請求項3の構成によれば、連結手段により人工構造物を山側傾斜面と一体化させることにより、路面構成部材の山側端部の上を押える力が大となり、路面構成部材の安定が向上する。
【0016】
また、請求項4の発明は、前記路面構成部材がコンクリート床版である。
【0017】
この請求項4の構成によれば、コンクリート床版を敷設して路面を形成することができる。
【0018】
また、請求項5の発明は、山側傾斜面と谷側傾斜面の間の道路に路面構成部材を敷設し、該路面構成部材の谷側端部を谷側に張り出して拡張し、前記山側傾斜面に擁壁を設ける道路拡張工法であって、前記路面構成部材を敷設し、この路面構成部材の山側端部上に前記擁壁の下部が位置するように該擁壁を形成する工法である。
【0019】
この請求項5の構成によれば、山側傾斜面に設けた擁壁により、路面構造部品の山側端部が押えられるから、張り出し部分を長くしても、路面構造部品の安定化を図ることができ、特に、擁壁の下部により山側端部の上を押える構造であるから、既設道路の掘削作業などが不要で、山側に近い位置で路面構成部材の端部に荷重を加えることができ、施工性にも優れたものとなる。
【0020】
【発明の実施形態】
以下、本発明の実施例を添付図面を参照して説明する。図1〜図2は本発明の第1実施形態を示し、同図に示すように、既設の道路1は、谷側Tの下向きの傾斜面2と山側Yの上向きの傾斜面3との間に挟まれている。
【0021】
拡張工事において、前記道路1に路面構成部材であるプレキャストコンクリート床版11を敷設する。コンクリート床版11は道路1の長さ方向に所定幅を有し、道路1の幅員方向にこれより長く形成され、道路1の長さ方向に複数並設され、該コンクリート床版11の谷側端11Tを、谷側Tに張り出して設けられている。
【0022】
また、道路1の長さ方向の複数並設されたコンクリート床版11,11…を道路長さ方向の横締め用PC鋼材12により緊張一体化し、前記コンクリート床版11にはそのPC鋼材12を挿通する孔13が穿設されている。
【0023】
前記山側の傾斜面3に人工構造物であるコンクリート製などの擁壁21を設け、この擁壁21はその下部たる下面22の一部が前記コンクリート床版11の山側端部11T上に位置するように接しており、下面22でコンクリート床版11に接する部分が押さえ部23である。
【0024】
そして、施工手順の一例として、前記コンクリート床版11を道路1に敷設して路面14を形成し、その山側端部11Yの上に一部が位置するように擁壁21を形成する。
【0025】
その場合、前記擁壁21の高さH、押さえ部23の道路幅員方向の幅B1や擁壁21の上面の道路幅員方向の幅B2などは、路面14の張り出し部分14Hの寸法や路面14に加わる車両の重量により必要サイズに設定できる。
【0026】
また、前記擁壁21の上面に、道路長さ方向の排水溝24を設ける。こうすることにより、擁壁21の上方から流れ落ちてきた水が排水溝24により排水され、路面14に流れることを防止できるため、路面14の山側Yに排水溝を設ける必要がなく、路面14の幅員を確保することができる。尚、図中51は前記コンクリート床版11の谷側下面を支持する基礎である。
【0027】
また、前記コンクリート床版11と擁壁21とを連結することができ、これらの連結に用いる連結手段25としては、鉄筋やアンカーボルトなどの鋼材,連結金具などを用いることができ、その際、溶接などを用いてもよく、あるいはコンクリート床版11と擁壁21とを凹凸嵌合などの嵌め合いにより接合してもよく、各種の接合方法を用いることができる。
【0028】
路面構成部材は、コンクリート床版11以外にも、路面としての機能を持ち、車両重量などの荷重に対して、山側及び谷側に支点を有する梁として機能できれば、各種のものを用いることができ、鋼製であってもよく、鋼とコンクリートとの複合部材でもよく、ほぼ平板状をなす。また、図2に示すように、コンクリート床版11は、平板部11Aの下面に道路幅員方向のウエブ部11Bを一体に設けた断面略T字状でもよく、あるいはウエブ部11Bのない断面矩形形状でもよく、中空であってもよい。また、図2に示すように、コンクリート床版11は、道路幅員方向のPC鋼材15により緊張力を付与したPC部材とすることができ、緊張力はプレテンション方式でもポストテンション方式でもよい。あるいは、緊張力を付与しないRC部材を用いてもよい。
【0029】
また、図ではコンクリート床版11…を横締め用PC鋼材12により道路長さ方向に緊張一体化したが、横締め用連結鋼材を用いずに、鉄筋などの鋼材(図示せず)で隣り合うコンクリート床版11…を連結してもよい。
【0030】
上記のように、谷側T側の例えば基礎51を支点として、山側に離れた位置でコンクリート床版11の山側端部11Yを押えるため、てこの原理を最大限活用することができ、山側Yに設ける人工構造物たる擁壁21が小さく軽量なもので済む。また、既設道路1の地盤支持力が低い場合は、道路1の谷側Tに基礎51を設け、山側Yは谷側Tと同様に基礎が必要となる。基礎が不要となる。また、従来のように道路にカウンターウエートを設けた場合では、該カウンターウエートと路面構成部材との一体化や別途連結構造が必要となり、路面構成部材の形状が複雑となるが、本発明では、路面構成部材を比較的薄く単純な形状とすることができ、これらにより、施工の簡略化でき、工期の短縮化が可能となる。また、山側Yに設置される擁壁21は、路面構成部材の山側端部の浮き上がりを防止する押さえ込みの役割を果たすと共に、山側傾斜面3の安定処理を兼用するので、信頼性の高い拡張工事を提供できる。また、山側傾斜面3を流下する水の排水については、擁壁21の上方にできた平場を効果的に活用することができ、そこに任意の大きさ配置の排水溝24を無理なく設置することができる。
【0031】
このように本実施形態では、請求項1に対応して、山側傾斜面3と谷側傾斜面2の間の道路1に路面構成部材たるコンクリート床版11を設け、該コンクリート床版11の谷側端部11Tを谷側Tに張り出して拡張する道路拡張構造において、道路1の山側Yに人工構造物たる擁壁21を設け、この擁壁21にコンクリート床版11の山側端部11Yを上から押える押さえ部23を設けたから、山側傾斜面3に設けた擁壁21により、コンクリート床版11の山側端部11Yが押えられ、路面14の張り出し部分14Hを長くしても、コンクリート床版11の安定化を図ることができる。特に、山側端部11Yの上を押える構造であるから、既設道路1の掘削作業などが不要で、山側Yに近い位置でコンクリート床版11の端部に荷重を加えることができる。
【0032】
また、このように本実施形態では、請求項2に対応して、人工構造物が山側傾斜面3に設けた擁壁21であるから、山側傾斜面3の擁壁21を利用してコンクリート床版11の山側Yを押えることにより、コンクリート床版11による安定性した張り出し構造が得られる。
【0033】
また、このように本実施形態では、請求項4に対応して、路面構成部材がコンクリート床版11であるから、コンクリート床版11を敷設して路面14を形成することができる。
【0034】
このように本実施形態では、請求項5に対応して、山側傾斜面3と谷側傾斜面2の間の道路1にコンクリート床版11を敷設し、該コンクリート床版11の谷側端部11Tを谷側Tに張り出して拡張し、山側傾斜面3に擁壁21を設ける道路拡張工法であって、コンクリート床版11を敷設し、このコンクリート床版11の山側端部11Y上に擁壁21の下部が位置するように該擁壁21を形成するから、山側傾斜面3に設けた擁壁21により、コンクリート床版11の山側端部11Tが押えられるから、路面14の張り出し部分14Hを長くしてもコンクリート床版11の安定化を図ることができ、特に、擁壁21の下部により山側端部11Yの上を押える構造であるから、既設道路1の掘削作業などが不要で、山側に近い位置でコンクリート床版11の端部に荷重を加えることができ、施工性にも優れたものとなる。
【0035】
図3は本発明の第2実施形態を示し、上記第1実施形態と同一部分に同一符号を付し、その詳細な説明を省略して詳述すると、この例では、擁壁21Aは、表面側に埋殺し用の表面版31を設け、この表面版31は型枠を兼用するもので、プレキャストコンクリート製や鋼製のものが用いられ、その表面版31と山側傾斜面3との間に土やコンクリート等の埋め戻し材32を充填してなり、この例では埋め戻し材32として現場打ちコンクリートを充填したなり、このコンクリートからなる埋め戻し材32と山側傾斜面3の岩盤とを連結手段であるロックボルト33により連結する。
【0036】
このように本実施形態では、請求項3に対応して、山側傾斜面3と谷側傾斜面2の間の道路1に路面構成部材たるコンクリート床版11を設け、該コンクリート床版11の谷側端部11Tを谷側Tに張り出して拡張する道路拡張構造において、山側傾斜面3に人工構造物たる擁壁21を設け、この擁壁21にコンクリート床版11の山側端部11Yを上から押える押さえ部23を設け、人工構造物たる擁壁21Aを山側傾斜面3に連結する連結手段たるロックボルト33を備えるから、コンクリート床版11の山側端部11Yの上を押える力が大となり、コンクリート床版11の安定した構造となる。
【0037】
図4は本発明の第3実施形態を示し、上記各実施形態と同一部分に同一符号を付し、その詳細な説明を省略して詳述すると、この例では、上記第2実施形態の擁壁21Aにおいて、前記表面版31と、現場打ちコンクリートである埋め戻し材32とを鉄筋34により連結してなり、表面版31と埋め戻し材32が一体となった擁壁21Aの押さえ部23によりコンクリート床版11の山側端部11Yを押えて、安定した路面構造が得られる。
【0038】
また、この例及び前記第2実施形態では、コンクリート床版11を敷設した後、その上に表面版31を据え付けることができるから、表面版31の据付作業を容易に行うことができる。
【0039】
図5は本発明の第4実施形態を示し、上記各実施形態と同一部分に同一符号を付し、その詳細な説明を省略して詳述すると、この例では、コンクリート床版11を敷設した後、該コンクリート床版11の山側端部11Yの上にコンクリート製の擁壁本体41を設け、この擁壁本体41は、プレキャストコンクリート製のものを据え付けたり、現場打ちコンクリートにより形成され、該擁壁本体41と山側傾斜面3との間に前記埋め戻し材32を充填し、前記擁壁本体41と埋め戻し材32により擁壁21Bを構成している。また、この例では、コンクリート床版11と擁壁本体41とを連結手段25により連結している。
【0040】
この例においても、山側傾斜面3に設けた擁壁21Bにより、コンクリート床版11の山側端部11Yが押えられ、上記各実施形態と同様な作用効果を奏する。
【0041】
図6は本発明の第5実施形態を示し、上記各実施形態と同一部分に同一符号を付し、その詳細な説明を省略して詳述すると、この例では、コンクリート床版11を敷設した後、該コンクリート床版11の山側端部11Yの上にコンクリート製の擁壁本体42を設け、この擁壁本体42は、プレキャストコンクリート部材を並べて据え付けたり、現場打ちコンクリートにより形成され、該擁壁本体41と山側傾斜面3との間に前記埋め戻し材32を充填し、前記擁壁本体41と埋め戻し材32により擁壁21Bを構成し、前記擁壁本体42は縦壁部43と底版部44とを一体に有する略L型形状をなす。
【0042】
この例においても、山側傾斜面3に設けた擁壁21Bにより、コンクリート床版11の山側端部11Yが押えられ、上記各実施形態と同様な作用効果を奏する。
【0043】
図7は本発明の第6実施形態を示し、上記各実施形態と同一部分に同一符号を付し、その詳細な説明を省略して詳述すると、擁壁21,21A,21Bなどにおいて、既設の道路1の谷側Tに基礎51を形成し、この基礎51は道路1を掘削し、プレキャストコンクリート部材を並べて形成したり、現場打ちコンクリートにより形成される。そして、既設の道路1に凹凸があり、道路1と路面構成部材たるコンクリート床版11との間に空隙52がある場合は、コンクリート床版11の下面に、グラウトやモルタルなどの硬化を有する充填材53を充填することができる。尚、コンクリート床版11の山側端部11Yが基礎51Y或いは道路1に直接支持されている場合は路面14が安定するから、前記空隙52は無充填でもよい。
【0044】
図8は本発明の第7実施形態を示し、上記各実施形態と同一部分に同一符号を付し、その詳細な説明を省略して詳述すると、同図は、路面構成部材たるコンクリート床版11の谷側支持構造を示し、図8では、既設の道路1の谷側Tに断面略逆T字型の基礎51を形成し、この基礎51は道路1を掘削し、プレキャストコンクリート部材を並べて形成したり、現場打ちコンクリートにより形成される。そして、前記基礎51の上面によりコンクリート床版11の谷側が支持されている。
【0045】
図9は本発明の第8実施形態を示し、上記各実施形態と同一部分に同一符号を付し、その詳細な説明を省略して詳述すると、同図は、路面構成部材たるコンクリート床版11の谷側支持構造を示し、この例の基礎51は、既設の道路1の谷側Tに矢板や杭などの杭構造54を形成し、この杭構造54の上に枕梁55を設けてなり、この枕梁55は、プレキャストコンクリート部材を並べて形成したり、現場打ちコンクリートにより形成される。そして、前記基礎51の枕梁55の上面によりコンクリート床版11の谷側が支持されている。
【0046】
図11は本発明の第9実施形態を示し、上記各実施形態と同一部分に同一符号を付し、その詳細な説明を省略して詳述すると、同図は、道路1の谷側に基礎を設けない例を示し、道路1が必要な地盤支持力を有する場合は、基礎を設けることなく、コンクリート床版11と道路1との空隙52に充填材53を充填して道路1とコンクリート床版11とを一体化すればよい。
【0047】
尚、本発明は上記各実施例に限定されるものではなく、本発明の容易の範囲内において、種々の変形実施が可能である。
【0048】
【発明の効果】
請求項1の発明は、山側傾斜面と谷側傾斜面の間の道路に路面構成部材を設け、該路面構成部材の谷側端部を谷側に張り出して拡張する道路拡張構造において、前記道路の山側に人工構造物を設け、この人工構造物に前記路面構成部材の山側端部を上から押える押さえ部を設けたものであり、掘削を伴う基礎工事などを軽減でき、安定性に優れた道路拡張構造を提供できる。
【0049】
また、請求項2の発明は、前記人工構造物が前記山側傾斜面に設けた擁壁である。
【0050】
また、請求項3の発明は、記人工構造物を前記山側傾斜面に連結する連結手段を備えるものであり、掘削を伴う基礎工事などを軽減でき、安定性に優れた道路拡張構造を提供できる。
【0051】
また、請求項4の発明は、前記路面構成部材がコンクリート床版であり、掘削を伴う基礎工事などを軽減でき、安定性に優れた道路拡張構造を提供できる。
【0052】
また、請求項5の発明は、山側傾斜面と谷側傾斜面の間の道路に路面構成部材を敷設し、該路面構成部材の谷側端部を谷側に張り出して拡張し、前記山側傾斜面に擁壁を設ける道路拡張工法であって、前記路面構成部材を敷設し、この路面構成部材の山側端部上に前記擁壁の下部が位置するように該擁壁を形成する工法であり、掘削を伴う基礎工事などを軽減でき、安定性に優れた道路拡張工法を提供できる。
【図面の簡単な説明】
【図1】本発明の第1実施形態を示す道路拡張構造の断面図である。
【図2】同上、路面構成部材の一部切り欠き斜視図である。
【図3】本発明の第2実施形態を示す道路拡張構造の断面図である。
【図4】本発明の第3実施形態を示す道路拡張構造の断面図である。
【図5】本発明の第4実施形態を示す道路拡張構造の断面図である。
【図6】本発明の第5実施形態を示す道路拡張構造の断面図である。
【図7】本発明の第6実施形態を示す道路拡張構造の断面図である。
【図8】本発明の第7実施形態を示す道路拡張構造の要部の断面図である。
【図9】本発明の第8実施形態を示す道路拡張構造の要部の断面図である。
【図10】本発明の第9実施形態を示す道路拡張構造の断面図である。
【図11】従来例の谷側傾斜面に擁壁を設ける道路拡張構造の断面図である。
【図12】従来例のコンクリート床版を用いた道路拡張構造の断面図である。
【符号の説明】
1 道路
2 傾斜面(谷側傾斜面)
3 傾斜面(山側傾斜面)
11 コンクリート床版(路面構成部品)
21,21A,21B 擁壁
22 下面
23 押さえ部
33 ロックボルト(連結手段)
T 谷側
Y 山側
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a road expansion structure and a road expansion method for expanding a road in which a mountain side and a valley side form an inclined surface.
[0002]
[Prior art]
Conventionally, in order to expand this kind of road, as shown in FIG. 11, a retaining wall 102 is constructed on a valley side of a road 101, and an embankment 104 is filled between a back surface of the retaining wall 102 and an inclined surface 103. As shown in FIG. 12, a concrete lower foundation 104 is formed on an inclined surface 103, and a pillar 105 is erected on the lower foundation 104. A structure is used in which a concrete upper foundation 106 is constructed at the valley side end, and a concrete floor slab 107 is extended and supported by the columns 105 and the upper foundation 106 (for example, Patent Document 1).
[0003]
However, in the structure for filling the embankment 104, the base portion 102A below the retaining wall 102 becomes large, and the construction of the base portion 102 becomes large and the earth pressure by the embankment 104 becomes large. Of the retaining wall 102 is required.
[0004]
Further, in the above-described structure in which the concrete floor slab 107 is extended and supported, the valley side of the existing road 101 must be excavated and the upper foundation 106 must be constructed here. The construction cannot be done unless all roads are closed. Further, since the concrete floor slab 107 in the horizontal state is provided so as to protrude, the upper foundation 106 is formed large in order to obtain sufficient strength against the load applied to the portion protruding from the position of the support 105 to the valley side. The concrete floor slab 107 must be firmly connected to the upper foundation 106.
[0005]
On the other hand, there is a method in which the road is expanded toward the mountain side by shaving the slope on the mountain side of the road, but excavation and processing of the generated soil are complicated.
[0006]
In the structures of FIGS. 11 and 12, construction is mainly performed on the slope on the valley side. On the other hand, as a structure mainly including construction on the existing road side, the existing road on the slope is changed to the valley side of the slope. In the road widened to, the foundation girder which is installed at the mountain side end and the valley side end of the existing road at predetermined intervals in the direction of extension of the road, and the heads of a plurality of foundation piles are joined by girder, The base girder has an overhanging girder extending horizontally toward the outside of the valley end of the existing road, and a widened road having a floor slab mounted on the overhanging girder (for example, Patent Publication 2). On the valley side, an underground support is formed along the direction of travel of the road, and on the mountain side, a counterweight is formed underground along the direction of travel of the road. Installed in the direction that intersects with the direction of travel and the middle part as an underground support Therefore, there is a road expansion method in which concrete slabs are continuously arranged so as to support the slab and protrude the valley side of the slab from an existing road (for example, Patent Document 3).
[0007]
[Patent Document 1]
JP 10-88504 A (FIGS. 6 and 7)
[Patent Document 2]
JP 10-227002 A [Patent Document 3]
JP-A-5-156601 [0008]
[Problems to be solved by the invention]
Both the extended road disclosed in Patent Document 2 and the road expansion method disclosed in Patent Document 3 require extensive excavation and pile driving work on an existing road. In addition, for stability of the extended road, it is preferable that the foundation pile on the mountain side is as close to the mountain side as possible in Patent Document 2, and it is preferable that the counterweight is close to the mountain side in Patent Document 3, but the existing road is excavated or piled. In the method of hammering, there is a certain limit in trying to move the foundation pile and the counterweight closer to the mountain side because the construction positions of the foundation pile and the counterweight are restricted.
[0009]
Therefore, an object of the present invention is to provide a road expansion structure and a road expansion method that can reduce foundation work and the like involving excavation and are excellent in stability.
[0010]
[Means for Solving the Problems]
The invention according to claim 1 is a road expansion structure in which a road surface component is provided on a road between a mountain-side inclined surface and a valley-side inclined surface, and a valley side end of the road surface component is extended to a valley side to expand the road. An artificial structure is provided on the mountain side, and a holding portion for pressing the mountain side end of the road surface component from above is provided on the artificial structure.
[0011]
According to the configuration of the first aspect, the mountain-side end of the road surface structural component is pressed by the artificial structure provided on the mountain side, so that the road surface structural component can be stabilized even if the overhang portion is lengthened. . In particular, since the structure presses the top of the mountain side end, excavation work of the existing road is unnecessary, and a load can be applied to the end of the road surface component at a position close to the mountain side.
[0012]
The invention according to claim 2 is a retaining wall in which the artificial structure is provided on the mountain-side inclined surface.
[0013]
According to the configuration of the second aspect, by using the retaining wall of the mountain-side inclined surface to press the mountain side of the road surface component, a stable overhang structure by the road surface component can be obtained.
[0014]
The invention according to claim 3 is provided with a connecting means for connecting the artificial structure to the mountain-side inclined surface.
[0015]
According to the configuration of the third aspect, by integrating the artificial structure with the mountain-side inclined surface by the connecting means, the force pressing on the mountain-side end of the road-surface component becomes large, and the stability of the road-surface component is improved. I do.
[0016]
In the invention of claim 4, the road surface component is a concrete floor slab.
[0017]
According to the configuration of the fourth aspect, a road surface can be formed by laying a concrete floor slab.
[0018]
According to a fifth aspect of the present invention, a road surface component is laid on a road between a mountain-side inclined surface and a valley-side inclined surface, and a valley-side end of the road surface component is extended to a valley side and expanded, and A road expanding method of providing a retaining wall on a surface, wherein the road surface component is laid, and the retaining wall is formed such that a lower portion of the retaining wall is located on a mountain side end of the road surface component. .
[0019]
According to the configuration of claim 5, since the retaining wall provided on the mountain-side inclined surface presses the mountain-side end of the road-surface structural component, the road-surface structural component can be stabilized even if the overhanging portion is lengthened. It is possible to apply a load to the end of the road surface component at a position near the mountain side, especially because it is a structure that presses on the mountain side end by the lower part of the retaining wall, so that excavation work of the existing road is unnecessary, Excellent workability.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIGS. 1 and 2 show a first embodiment of the present invention. As shown in FIG. 1, an existing road 1 is provided between a downward slope 2 on a valley side T and an upward slope 3 on a mountain side Y. It is sandwiched between.
[0021]
In the expansion work, a precast concrete floor slab 11 as a road surface component is laid on the road 1. The concrete slab 11 has a predetermined width in the length direction of the road 1, is formed to be longer in the width direction of the road 1, and is arranged in plurality in the length direction of the road 1. The end 11T is provided so as to protrude toward the valley side T.
[0022]
Also, a plurality of concrete slabs 11, 11... Arranged side by side in the length direction of the road 1 are tensioned and integrated by a laterally tightening PC steel material 12 in the length direction of the road. A hole 13 to be inserted is formed.
[0023]
A retaining wall 21 made of an artificial structure such as concrete is provided on the inclined surface 3 on the mountain side, and a part of a lower surface 22 serving as a lower part of the retaining wall 21 is located on a mountain side end 11T of the concrete floor slab 11. The portion in contact with the concrete floor slab 11 on the lower surface 22 is the pressing portion 23.
[0024]
Then, as an example of the construction procedure, the concrete floor slab 11 is laid on the road 1 to form a road surface 14, and the retaining wall 21 is formed so as to be partially located on the mountain side end 11Y.
[0025]
In this case, the height H of the retaining wall 21, the width B1 of the pressing portion 23 in the width direction of the road, and the width B2 of the upper surface of the retaining wall 21 in the width direction of the road are determined by the dimensions of the overhang portion 14H of the road surface 14 and the road surface 14. The required size can be set according to the weight of the vehicle to be added.
[0026]
On the upper surface of the retaining wall 21, a drainage groove 24 in the length direction of the road is provided. By doing so, it is possible to prevent the water that has flowed down from above the retaining wall 21 from being drained by the drainage groove 24 and to flow to the road surface 14, so that it is not necessary to provide a drainage groove on the mountain side Y of the road surface 14, and The width can be secured. In the drawing, reference numeral 51 denotes a foundation that supports the lower surface of the concrete floor slab 11 on the valley side.
[0027]
Further, the concrete floor slab 11 and the retaining wall 21 can be connected to each other, and as the connecting means 25 used for connecting the concrete slabs 11, a steel material such as a reinforcing bar or an anchor bolt, a connecting fitting, or the like can be used. Welding or the like may be used, or the concrete floor slab 11 and the retaining wall 21 may be joined by fitting such as uneven fitting, and various joining methods can be used.
[0028]
The road surface component member can be any type other than the concrete floor slab 11 as long as it has a function as a road surface and can function as a beam having a fulcrum on the hill side and the valley side against a load such as a vehicle weight. It may be made of steel or a composite member of steel and concrete, and has a substantially flat shape. As shown in FIG. 2, the concrete floor slab 11 may have a substantially T-shaped cross-section in which a web portion 11B in the width direction of the road is integrally provided on the lower surface of the flat plate portion 11A, or a rectangular cross-section without the web portion 11B. However, it may be hollow. As shown in FIG. 2, the concrete floor slab 11 can be a PC member to which tension is applied by a PC steel material 15 in the width direction of the road, and the tension may be a pretension type or a post tension type. Alternatively, an RC member to which no tension is applied may be used.
[0029]
Also, in the figure, the concrete floor slabs 11 are tensioned and integrated in the length direction of the road by the laterally tightening PC steel material 12, but are adjacent to each other by a steel material (not shown) such as a reinforcing bar without using the laterally tightening connecting steel material. The concrete slabs 11 may be connected.
[0030]
As described above, with the base 51 on the valley side T side as a fulcrum, the ridge side end 11Y of the concrete floor slab 11 is pressed at a position away from the hill side, so that the principle of leverage can be utilized to the utmost. In this case, the retaining wall 21 as an artificial structure to be provided in the vehicle can be small and light. When the ground support force of the existing road 1 is low, the foundation 51 is provided on the valley side T of the road 1, and the hill side Y requires the same foundation as the valley side T. No foundation is needed. Further, in the case where a counterweight is provided on a road as in the related art, integration of the counterweight and the road surface component or a separate connection structure is required, and the shape of the road surface component is complicated, but in the present invention, The road surface component can be made relatively thin and simple in shape, thereby simplifying the construction and shortening the construction period. In addition, the retaining wall 21 installed on the mountain side Y serves to hold down the mountain side end of the road surface component and also serves as a stabilizing process for the mountain side inclined surface 3, so that highly reliable expansion work can be performed. Can be provided. In addition, as for drainage of water flowing down the mountain-side inclined surface 3, a flat field formed above the retaining wall 21 can be effectively utilized, and a drainage groove 24 having an arbitrary size arrangement is easily installed there. be able to.
[0031]
As described above, in the present embodiment, the concrete floor slab 11 serving as a road surface component is provided on the road 1 between the mountain-side slope 3 and the valley-side slope 2, and the valley of the concrete floor 11 is provided. In the road expanding structure in which the side end 11T is extended to the valley side T and extended, a retaining wall 21 as an artificial structure is provided on the mountain side Y of the road 1, and the mountain side end 11Y of the concrete floor slab 11 is placed on the retaining wall 21. Since the retaining portion 23 is provided to hold the concrete floor slab 11, the retaining wall 21 provided on the mountain-side inclined surface 3 presses the mountain-side end 11Y of the concrete floor slab 11, and even if the overhang portion 14H of the road surface 14 is lengthened, Can be stabilized. In particular, since the structure presses the top of the mountain side end 11Y, excavation work of the existing road 1 is unnecessary, and a load can be applied to the end of the concrete floor slab 11 at a position close to the mountain side Y.
[0032]
In this embodiment, as described above, the artificial structure is the retaining wall 21 provided on the mountain-side inclined surface 3, and accordingly, the concrete floor is formed by using the retaining wall 21 of the mountain-side inclined surface 3. By pressing the hill side Y of the slab 11, a stable overhang structure by the concrete floor slab 11 can be obtained.
[0033]
Further, in this embodiment, as described above, since the road surface constituting member is the concrete floor slab 11, the road surface 14 can be formed by laying the concrete floor slab 11.
[0034]
As described above, in this embodiment, the concrete floor slab 11 is laid on the road 1 between the mountain-side slope 3 and the valley-side slope 2, and the valley-side end of the concrete floor slab 11. This is a road expansion method in which 11T is extended to the valley side T and extended to provide a retaining wall 21 on the hill-side inclined surface 3. In this method, a concrete slab 11 is laid, and a retaining wall is provided on the hill-side end 11Y of the concrete slab 11. Since the retaining wall 21 is formed so that the lower portion of the concrete floor slab 21 is located, the retaining wall 21 provided on the mountain-side inclined surface 3 presses the mountain-side end 11T of the concrete floor slab 11, so that the overhanging portion 14H of the road surface 14 is formed. Even if it is long, the concrete floor slab 11 can be stabilized. In particular, since the lower part of the retaining wall 21 presses the top of the mountain side end 11Y, excavation work of the existing road 1 is unnecessary, and the mountain side is not required. In a location close to Can apply a load to the end of the preparative slab 11, it becomes excellent in workability.
[0035]
FIG. 3 shows a second embodiment of the present invention, in which the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In this example, the retaining wall 21A has a surface A surface plate 31 for embedding is provided on the side, and this surface plate 31 also serves as a formwork, and is made of precast concrete or steel, and is provided between the surface plate 31 and the mountain-side inclined surface 3. The backfill material 32 such as soil or concrete is filled. In this example, the backfill material 32 is filled with cast-in-place concrete, and the backfill material 32 made of the concrete and the rock on the mountain-side slope 3 are connected. Are connected by a lock bolt 33.
[0036]
As described above, in the present embodiment, the concrete floor slab 11 as a road surface component is provided on the road 1 between the mountain-side slope 3 and the valley-side slope 2, and the valley of the concrete floor slab 11 is provided. In the road expanding structure in which the side end 11T is extended to the valley side T and extended, a retaining wall 21 as an artificial structure is provided on the mountain-side inclined surface 3, and the mountain-side end 11Y of the concrete floor slab 11 is placed on the retaining wall 21 from above. Since the holding portion 23 for holding is provided and the lock bolt 33 is provided as a connecting means for connecting the retaining wall 21A as an artificial structure to the mountain-side inclined surface 3, the force for pressing on the mountain-side end 11Y of the concrete floor slab 11 becomes large, The concrete floor slab 11 has a stable structure.
[0037]
FIG. 4 shows a third embodiment of the present invention, in which the same parts as those in the above-described embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. In the wall 21A, the surface slab 31 and the backfill material 32, which is cast-in-place concrete, are connected by a reinforcing bar 34, and the pressing portion 23 of the retaining wall 21A in which the surface slab 31 and the backfill material 32 are integrated is formed. By pressing the mountain side end 11Y of the concrete floor slab 11, a stable road surface structure can be obtained.
[0038]
Further, in this example and the second embodiment, after the concrete floor slab 11 is laid, the surface slab 31 can be installed thereon, so that the installation work of the surface slab 31 can be easily performed.
[0039]
FIG. 5 shows a fourth embodiment of the present invention. The same parts as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. In this example, a concrete floor slab 11 is laid. Thereafter, a concrete retaining wall main body 41 is provided on the mountain side end 11Y of the concrete floor slab 11, and the retaining wall main body 41 is formed by installing a precast concrete one or by using cast-in-place concrete. The backfill material 32 is filled between the wall body 41 and the mountain-side inclined surface 3, and the retaining wall body 41 and the backfill material 32 form a retaining wall 21 </ b> B. In this example, the concrete floor slab 11 and the retaining wall main body 41 are connected by the connecting means 25.
[0040]
Also in this example, the mountain-side end 11Y of the concrete floor slab 11 is pressed by the retaining wall 21B provided on the mountain-side inclined surface 3, and the same operational effects as those of the above-described embodiments can be obtained.
[0041]
FIG. 6 shows a fifth embodiment of the present invention, in which the same parts as those in the above embodiments are given the same reference numerals, and detailed description thereof is omitted. In this example, a concrete floor slab 11 is laid. After that, a concrete retaining wall main body 42 is provided on the mountain side end 11Y of the concrete floor slab 11, and the retaining wall main body 42 is formed by installing precast concrete members side by side or formed by cast-in-place concrete. The backfill material 32 is filled between the main body 41 and the mountain-side inclined surface 3, and the retaining wall main body 41 and the backfill material 32 form a retaining wall 21B. The retaining wall main body 42 includes a vertical wall portion 43 and a bottom plate. It has a substantially L-shape integrally with the portion 44.
[0042]
Also in this example, the mountain-side end 11Y of the concrete floor slab 11 is pressed by the retaining wall 21B provided on the mountain-side inclined surface 3, and the same operational effects as those of the above-described embodiments can be obtained.
[0043]
FIG. 7 shows a sixth embodiment of the present invention, in which the same parts as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted. A foundation 51 is formed on the valley side T of the road 1 of the No. 1, and the foundation 51 is formed by excavating the road 1 and arranging precast concrete members side by side or by cast-in-place concrete. When the existing road 1 has irregularities and there is a gap 52 between the road 1 and the concrete floor slab 11 as a road surface component, the lower surface of the concrete floor slab 11 is filled with hardening such as grout or mortar. Material 53 can be filled. When the mountain side end 11Y of the concrete floor slab 11 is directly supported by the foundation 51Y or the road 1, the road surface 14 is stabilized, and thus the space 52 may be unfilled.
[0044]
FIG. 8 shows a seventh embodiment of the present invention, in which the same parts as those in the above embodiments are given the same reference numerals, and detailed description thereof is omitted. 8 shows a valley-side support structure 11. In FIG. 8, a foundation 51 having a substantially inverted T-shaped cross section is formed on the valley side T of the existing road 1, and the foundation 51 is formed by excavating the road 1 and arranging precast concrete members. Formed or formed by cast-in-place concrete. The valley side of the concrete floor slab 11 is supported by the upper surface of the foundation 51.
[0045]
FIG. 9 shows an eighth embodiment of the present invention, in which the same parts as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. 11 shows a valley-side support structure 11. In this example, a foundation 51 is formed by forming a pile structure 54 such as a sheet pile or a pile on the valley side T of the existing road 1, and providing a bolster 55 on the pile structure 54. The bolster 55 is formed by arranging precast concrete members side by side, or is formed by cast-in-place concrete. The valley side of the concrete floor slab 11 is supported by the upper surface of the bolster 55 of the foundation 51.
[0046]
FIG. 11 shows a ninth embodiment of the present invention, in which the same reference numerals are given to the same parts as those in the above embodiments, and detailed description thereof is omitted. In the case where the road 1 has a necessary ground support force, the gap 53 between the concrete slab 11 and the road 1 is filled with the filler 53 without providing the foundation, and the road 1 and the concrete floor are not provided. What is necessary is just to integrate the plate 11 with it.
[0047]
The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention.
[0048]
【The invention's effect】
The invention according to claim 1 is a road expansion structure in which a road surface component is provided on a road between a mountain-side inclined surface and a valley-side inclined surface, and a valley side end of the road surface component is extended to a valley side to expand the road. An artificial structure is provided on the mountain side, and a holding portion for pressing the mountain side end of the road surface component from above is provided on this artificial structure, foundation work involving excavation can be reduced, and stability is excellent. Road expansion structure can be provided.
[0049]
The invention according to claim 2 is a retaining wall in which the artificial structure is provided on the mountain-side inclined surface.
[0050]
Further, the invention of claim 3 is provided with a connecting means for connecting the artificial structure to the mountain-side inclined surface, and can reduce a foundation work associated with excavation and provide a road expansion structure excellent in stability. .
[0051]
According to the invention of claim 4, the road surface component is a concrete floor slab, which can reduce foundation work involving excavation and the like, and provide a road expansion structure excellent in stability.
[0052]
According to a fifth aspect of the present invention, a road surface component is laid on a road between a mountain-side inclined surface and a valley-side inclined surface, and a valley-side end of the road surface component is extended to a valley side and expanded, and A road expanding method of providing a retaining wall on a surface, wherein the road surface component is laid, and the retaining wall is formed such that a lower portion of the retaining wall is located on a mountain side end of the road surface component. In addition, it is possible to reduce the foundation work associated with excavation, and to provide a road expansion method with excellent stability.
[Brief description of the drawings]
FIG. 1 is a sectional view of a road expanding structure according to a first embodiment of the present invention.
FIG. 2 is a partially cutaway perspective view of a road surface component according to the first embodiment;
FIG. 3 is a sectional view of a road expanding structure according to a second embodiment of the present invention.
FIG. 4 is a sectional view of a road expanding structure according to a third embodiment of the present invention.
FIG. 5 is a sectional view of a road expanding structure according to a fourth embodiment of the present invention.
FIG. 6 is a sectional view of a road expanding structure according to a fifth embodiment of the present invention.
FIG. 7 is a sectional view of a road expanding structure according to a sixth embodiment of the present invention.
FIG. 8 is a sectional view of a main part of a road expansion structure showing a seventh embodiment of the present invention.
FIG. 9 is a sectional view of a main part of a road expanding structure according to an eighth embodiment of the present invention.
FIG. 10 is a sectional view of a road expanding structure according to a ninth embodiment of the present invention.
FIG. 11 is a cross-sectional view of a conventional road expanding structure in which a retaining wall is provided on a valley side inclined surface.
FIG. 12 is a cross-sectional view of a road expanding structure using a conventional concrete slab.
[Explanation of symbols]
1 road 2 slope (valley side slope)
3 slope (mountain side slope)
11 Concrete slabs (road surface components)
21, 21A, 21B Retaining wall 22 Lower surface 23 Holder 33 Lock bolt (connection means)
T Valley side Y Mountain side

Claims (5)

山側傾斜面と谷側傾斜面の間の道路に路面構成部材を設け、該路面構成部材の谷側端部を谷側に張り出して拡張する道路拡張構造において、前記道路の山側に人工構造物を設け、この人工構造物に前記路面構成部材の山側端部を上から押える押さえ部を設けたことを特徴とする道路拡張構造。In a road expanding structure in which a road surface component is provided on a road between a mountain side inclined surface and a valley side inclined surface, and a valley side end of the road surface component is extended to a valley side, an artificial structure is provided on the mountain side of the road. A road expansion structure, wherein a holding portion for pressing a mountain-side end of the road surface component from above is provided on the artificial structure. 前記人工構造物が前記山側傾斜面に設けた擁壁であることを特徴とする請求項1記載の道路拡張構造。The road expansion structure according to claim 1, wherein the artificial structure is a retaining wall provided on the mountain-side slope. 前記人工構造物を前記山側傾斜面に連結する連結手段を備えることを特徴とする請求項1又は2記載の道路拡張構造。The road expansion structure according to claim 1, further comprising a connection unit that connects the artificial structure to the mountain-side slope. 前記路面構成部材がコンクリート床版であることを特徴とする請求項1〜3のいずれか1項に記載の道路拡張構造。The road expansion structure according to any one of claims 1 to 3, wherein the road surface component is a concrete slab. 山側傾斜面と谷側傾斜面の間の道路に路面構成部材を敷設し、該路面構成部材の谷側端部を谷側に張り出して拡張し、前記山側傾斜面に擁壁を設ける道路拡張工法であって、前記路面構成部材を敷設し、この路面構成部材の山側端部上に前記擁壁の下部が位置するように該擁壁を形成することを特徴とする道路拡張工法。A road expansion method in which a road surface component is laid on a road between a mountain-side inclined surface and a valley-side inclined surface, a valley-side end of the road-surface component is extended to a valley side and expanded, and a retaining wall is provided on the mountain-side inclined surface. A road expansion method, wherein the road surface component is laid, and the retaining wall is formed such that a lower portion of the retaining wall is located on a mountain-side end of the road surface component.
JP2003034211A 2003-02-12 2003-02-12 Road extension method and road extension structure Expired - Fee Related JP3714475B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007270566A (en) * 2006-03-31 2007-10-18 Nihon Samicon Co Ltd Protective structure and its construction method
JP2012184580A (en) * 2011-03-04 2012-09-27 Hayashi Bussan Hatsumei Kenkyusho:Kk Road structure

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007270566A (en) * 2006-03-31 2007-10-18 Nihon Samicon Co Ltd Protective structure and its construction method
JP4576564B2 (en) * 2006-03-31 2010-11-10 日本サミコン株式会社 Protective structures and construction methods
JP2012184580A (en) * 2011-03-04 2012-09-27 Hayashi Bussan Hatsumei Kenkyusho:Kk Road structure

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