JP4104453B2 - Reinforcing structure and reinforcing method for rectangular section underground structure - Google Patents

Reinforcing structure and reinforcing method for rectangular section underground structure Download PDF

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JP4104453B2
JP4104453B2 JP2002380353A JP2002380353A JP4104453B2 JP 4104453 B2 JP4104453 B2 JP 4104453B2 JP 2002380353 A JP2002380353 A JP 2002380353A JP 2002380353 A JP2002380353 A JP 2002380353A JP 4104453 B2 JP4104453 B2 JP 4104453B2
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趙唯堅
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Taisei Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、矩形断面地中構造物の補強構造および補強方法に関するものである。
【０００２】
【従来の技術】
道路や鉄道、地下鉄、水路、下水道、通路、電力・ガス共同溝など矩形断面を有するトンネルやボックスカルバートなどは、図８に示すように上床版ｂ、下床版ｃおよび両側壁ｄ、ｄとからボックス状に形成され、幅広の矩形断面地中構造物ａにあっては、中空部ｅを左右に両断する中壁ｆを備えたタイプの矩形断面地中構造物ａもある。
【０００３】
地下に配置された矩形断面地中構造物ａは、地震時に幅方向に剪断変形する周辺地盤によって強制的に変形させられ、中柱や中壁ｆを有する場合には床版ｂ、ｃとの接合部に、またそれらを有しない場合には床版ｂ、ｃと側壁ｄ、ｄとの接合部に、最初に過大な剪断力と曲げモーメントが働き、該部分から圧縮破壊、もしくは剪断破壊して上床版ｂ上の鉛直荷重を支持する能力を失い、矩形断面地中構造物ａ全体の崩壊に至る。
【０００４】
そのため、従来からこれを回避する方法として、たとえばあらかじめ矩形断面地中構造物ａの中壁ｆや中柱に鋼材ダンパｇを組み込んだり、また既設の矩形断面地中構造物ａに対しては、側壁ｄ、ｄや中壁ｆあるいは中柱に、既設鉄筋コンクリート構造体の剪断または曲げ耐力の補強として一般的に知られている、帯鉄筋の追加を含んだＲＣの打ち増し、或いは鋼板巻きなどの方法によって、耐力を増大させることが行われてきた。
【０００５】
【発明が解決しようとする課題】
しかし、前記した従来の既設の矩形断面地中構造物の補強構造にあっては、次のような問題点がある。
＜イ＞あらかじめ設置して用いる鋼材ダンパを、既設矩形断面地中構造物にあとづけする場合、非常に大掛かりな工事になってしまい、また中柱や中壁のみに鋼材ダンパを配置しても矩形断面地中構造物全体の耐震性能を大きく向上させることには繋がらない。
＜ロ＞ＲＣの打ち増し、或いは補強鋼板の設置による補強は、断面を増大させることで崩壊を防止するため、矩形断面地中構造物の建築限界により制限を受けることもあって補強効果、特に横断方向の剪断補強効果に限界がある。
【０００６】
【発明の目的】
本発明は上記したような従来の問題を解決するためになされたもので、補強工事が大掛かりとならず、矩形断面地中構造物全体の耐震性能を向上させることができる、矩形断面地中構造物の補強構造および補強方法を提供することを目的とする。
また、矩形断面地中構造物の建築限界による制限を受けることなく、剪断耐力を大幅に向上させることができる、矩形断面地中構造物の補強構造および補強方法を提供することを目的とする。
本発明は、これらの目的の少なくとも一つを達成するものである。
【０００７】
【課題を解決するための手段】
上記のような課題を解決するために、本発明の矩形断面池中構造物の補強構造は、既設の矩形断面地中構造物の上床版と下床版とを連結する壁面に設けた長手方向が上下方向となるスリットと、スリットの一部に形成した後述する張出部が挿入可能な空洞部と、前記スリット内に挿入する板状鋼材と、
前記板状鋼材の上下の少なくともいずれかの端部に、前記板状鋼材の上下方向と交差する方向に張出した張出部と、前記スリットと前記板状鋼材との間に注入する補強充填材と、からなり、前記補強充填材をもって前記板状鋼材と前記矩形断面地中構造物を一体化したことを特徴とするものである。
【０００８】
また、本発明の矩形断面地中構造物の補強構造は、前記した矩形断面地中構造物の補強構造において、前記壁に矩形断面地中構造物の中空部に設けた中壁が含まれることを特徴としたものである。
ここで、中壁には矩形断面地中構造物の軸方向に、断続して形成される壁も含み、たとえば柱状に形成するものも含む。
【０００９】
また本発明の矩形断面地中構造物の補強構造は、既設の矩形断面地中構造物の上床版と下床版とを連結する壁面に設けた長手方向が上下方向となるスリットと、前記スリット内に挿入する板状鋼材と、前記スリットと前記板状鋼材との間に注入する補強充填材と、からなり、前記板状鋼材の長手方向に伸びる端部に沿って、前記板状鋼材の面と交差する方向に拡がる翼部を設け、スリットの開口部に翼部を当接させ、スリットの開口を翼部によって閉塞可能として、補強充填材を注入した際の型枠として機能させ、前記補強充填材をもって前記板状鋼材と前記矩形断面地中構造物を一体化したことを特徴とするものである、
【００１０】
また本発明の矩形断面地中構造物の補強構造は、既設の矩形断面地中構造物の上床版と下床版とを連結する壁面に設けた長手方向が上下方向となるスリットと、前記スリット内に挿入する板状鋼材と、前記スリットと前記板状鋼材との間に注入する補強充填材と、からなり、前記板状鋼材の長手方向に伸びる端部に沿って、前記板状鋼材の面と交差する方向に拡がる翼部を設け、
この翼部の張り出し長さを、スリットの開口幅よりも短く形成して、板状鋼材の全体がスリット内に収まるよう構成し、前記補強充填材をもって前記板状鋼材と前記矩形断面地中構造物を一体化したことを特徴とするものである。
【００１１】
また、矩形断面地中構造物の補強構造は、前記した矩形断面地中構造物の補強構造において、前記張出部を矩形断面地中構造物の中空部へ向けて前記板状鋼材の板幅より長く形成し、前記張出部と前記矩形断面地中構造物のハンチ部とを定着手段で定着し、固結材をもって前記矩形断面地中構造物と一体化したことを特徴とするものである。
【００１２】
また、前記した矩形断面地中構造物の補強構造を構築する補強方法において、既設の矩形断面地中構造物の上床版と下床版とを連結する壁面に、長手方向が上下方向となるスリットを形成し、前記スリット内に前記板状鋼材を挿入し、前記スリットと前記板状鋼材との間に補強充填材を注入して固結し、前記矩形断面地中構造物を補強することを特徴とするものである。
【００１３】
【発明の実施の形態１】
以下図面を参照しながら本発明の実施の形態について説明する。
なお、説明中で使用する「上・下」は図１に基づく。
【００１４】
＜イ＞全体構造
図１に矩形断面地中構造物１０の補強構造の一例を示す。
本発明は、上床版１１、下床版１２、側壁１３、１３および中壁１４からなる既設の矩形断面地中構造物１０の、上床版１１と下床版１２とを連結する側壁１３、１３および中壁１４を補強し、矩形断面地中構造物１０全体の横方向の剪断耐力を大幅に向上させるものである。
補強構造は、矩形断面地中構造物１０の軸方向に間隔をおいて設置する。
補強構造は、矩形断面地中構造物１０の中空部から外方向に向けて側壁１３、１３および中壁１４に設けた長手方向が上下方向となるスリット２０ａ、２０ｂと、スリット２０ａ、２０ｂ内に挿入する板状鋼材３０ａ、３０ｂと、スリット２０ａ、２０ｂと板状鋼材３０ａ、３０ｂとの間に注入する補強充填材４０とからなり、補強充填材４０をもって板状鋼材３０ａ、３０ｂと既設矩形断面地中構造物１０とを一体化して構成するものである。
なお、矩形断面地中構造物１０は、道路や鉄道トンネル（開削、沈埋など）、下水道トンネル、水路トンネル、地下駐車場、地下駅舎、地下通路、電力・ガス・通信用共同溝、ボックスカルバートなどに、適用対象の構造物である。
以下、各部材について詳述する。
【００１５】
＜ロ＞スリット
スリット２０は、図１に示すように既設矩形断面地中構造物１０の壁面１３、１４に対して、矩形断面地中構造物１０の中空部から矩形断面地中構造物１０の外方向に向けて形成する、矩形断面地中構造物１０の外周を貫通しない空隙である。
スリット２０の形状は、壁面１３、１４の上下方向を長手方向、矩形断面地中構造物１０の壁厚方向を深さ方向、そして矩形断面地中構造物１０の軸方向を幅方向、の寸法としてあらわすことができ、いずれの寸法も板状鋼材３０のすくなくとも一部を挿入できる寸法に形成する。
【００１６】
スリット２０の長手方向は、上床版１１と下床版１２とを垂直に結ぶ方向にかぎらず、たとえば矩形断面地中構造物１０が地盤に対して斜めに配設されている場合には、スリット２０を鉛直方向、すなわち矩形断面地中構造物１０の軸方向に対して斜めに形成してもよい。
【００１７】
両側壁１３、１３に形成するスリット２０ａは（図２（ａ））、側壁１３（幅厚Ｌ３）を貫通しないように形成し、このときの側壁１３の残り厚さを、１０〜１５ｃｍ程度は残すのが好ましい。
また中壁１４へ形成する貫通スリット２０ｂは（図３（ａ））、中壁１４を貫通して形成する。
スリット２０の開削した面は平滑である必要はなく、図４に示すように凹凸状としてもよい。また、スリット２０の壁面への開口形状は、長方形である場合に限らない。
【００１８】
＜ハ＞板状鋼材
板状鋼材３０は、矩形断面地中構造物１０の壁面１３、１４に配置して、矩形断面地中構造物１０の外側から及ぶ曲げモーメントまたは剪断力に対し、鋼材特有の粘性をもって抵抗し、さらには設計想定以上の地震を受けたときの崩壊も防止する。
板状鋼材３０は、たとえば基部３１を平鋼で構成して、基部３１の長手方向に伸びる端部に沿って、基部３１の形成面と交差する方向へ拡がる翼部３２を設ける。
翼部３２は、基部３１の端部に沿って両端（図３（ｂ））、或いは片端（図２（ｂ））のみに設けて、板状鋼材３の断面形状をＨ型、若しくはＴ型とする。また翼部３２は基部３１を中心として左右に拡がる形態とせず、右若しくは左の何れか一方のみに拡がる形態とし、これを二枚背中合わせにして用いてもよい（図５（ａ））。
さらに、翼部３２の張出し長さを、前述したスリット２０の開口幅より短く形成することで、断面Ｉ型（図５（ｃ））となった板状鋼材３０の全体を、スリット２０内に納めることができ、これによって壁面より全く突出しない補強構造にすることができる。
また、図４のように、両側で翼部３２の長さを変えてもよい。
【００１９】
板状鋼材３０を断面Ｈ型に形成する場合、片方の翼部３３を別体で構成してもよい。
この場合の連結方法としては、図３（ｂ）に示すように、基部３１の端面に一定間隔をおいて螺着部３４、３４・・を設け、脱着側の翼部３３に螺着部３４のピッチに合わせた孔３６を穿設しておき、孔３６を通じてこれらをボルト３５で連結するとよい。
また、翼部３３は熔接によって連結させる形態としたり、さらには図５（ｂ）に示すように、板状鋼材３０の片端の翼部３３をスリット２０幅より小さく形成してスリット２０の反対側から突出し、これに横鉄筋を配置した後、かぶりモルタルを打設して、翼部３３としてもよい。
【００２０】
なお、翼部３２を基部３１の上端部の一部を除いた長さとして、後述する補強充填材４０の注入口として利用してもよい。
また、板状鋼材３０は、翼部３２を備えずに基部３１だけからなる、断面一文字の板状鋼材３０を採用することもできる。
【００２１】
以上、基部３１の長手方向に伸びる端部に沿って、基部３１面と交差する方向に拡がる翼部３２を備えた形態の板状鋼材３０を中心に説明したが、板状鋼材３０はこの形態に限定されることなく、基部３１の上下端部に板状鋼材３０の上下方向と交差する張出部５０、５０を設けることもでき、この形態については、実施の形態２および３で詳述する。
【００２２】
＜ニ＞補強充填材
補強充填材４０は、スリット２０と板状鋼材３０との間隙に注入して、固結させ、板状鋼材３０と矩形断面地中構造物１０とを一体化するもので、たとえば、セメントミルク、モルタル、コンクリート、樹脂系の接着剤などを用いる。
なお、補強充填材４０は上記したものに限らず、矩形断面地中構造物１０の側面に形成したスリット２０とスリット２０内部に挿入した板状鋼材３０とを一体にできるものであれば特に問わない。
【００２３】
【実施例】
以下、図面を参照しながら本発明の矩形断面地中構造物の補強構造および補強方法について説明する。
【００２４】
＜イ＞ スリットの形成
地下に配置する既設の矩形断面地中構造物１０の壁面１３、１４、１３に、スリット２０ａ、２０ｂ、２０ａを設ける位置等を決定する。
矩形断面地中構造物１０の耐力は、スリット２０のピッチによって増減することができる。
スリット２０は、矩形断面地中構造物１０の軸方向に（０．５〜１．５）×Ｂの間隔で設ける（Ｂは矩形断面地中構造物１０の横断方向の全幅）。
位置を決定した後、カッター、ウォータージェット、またはボーリング機械等の公知の機械を用いてスリット２０を形成する。
【００２５】
中壁１４には、壁を貫通し両中空部を連結する貫通スリット２０ｂを形成し、側壁１３には中空部から壁厚の途中までの深さを有するスリット２０ａを形成する。
このとき、スリット２０ａ、２０ｂの内面を凹凸状に形成すると、補強充填材４０と側壁１３、１４との間に高い摩擦を期待することができる。
【００２６】
＜ロ＞板状鋼材の配置
側壁１３に対して刻設したスリット２０ａには、Ｔ型の板状鋼板３１を定着させる（図２（ｂ））。
中壁１４に形成した貫通スリット２０ｂには、翼部３２の一方を分離可能に構成したＨ型鋼板３０ｂの、基部３１を有する部材を先に配置する（図３（ｂ））。
基部３１をスリット２０ｂの奥まで差し込み、スリット２０ｂの開口部に翼部３２を当接させ、Ｈ型鋼板３０ｂの位置決めを行う。
基部３１の先端に配する螺着部３４に、翼部３３の孔３６を一致させ、ボルト３５を順番に締め付けて、断面Ｈ型に形成し、Ｈ型鋼板３０ｂを中壁１４に配置する。
このとき、スリット２０ｂの開口が翼部３２、３３によって閉塞可能に設計しておけば、補強充填材４０を注入した際の型枠の代用となり、経済的である。
【００２７】
＜ハ＞補強充填材の注入
スリット２０ａとＴ型鋼板３０ａとの間隙、および貫通スリット２０ｂとＨ型鋼板３０ｂとの間隙に、それぞれ補強充填材４０を注入して固化させ（図２（ｃ）、図３（ｃ））、板状鋼材３０ａ、３０ｂと既設矩形断面地中構造物１０を一体化させる。
【００２８】
これによって、既設矩形断面地中構造物１０の内部寸法をほとんど変えることなく、上下床版１１、１２と壁面１３、１４との接合部を確実に補強することできるができ、ひいては、既設矩形断面地中構造物１０は地盤から受ける横方向の力に対して、安定した性能を確保することができる。
これによって、本発明の補強構造は、当時の耐震設計基準を基に設計されている既設の矩形断面地中構造物１０が、さらに経年と共に老朽化して、構造耐力を減衰するのを防止するだけではなく、補強することによって、より厳しくなりつつある現在の耐震設計基準にまで到達、クリアーさせることができるように補強するものである。
以上、矩形断面地中構造物１０の補強を、中壁１４と両側壁１３、１３の両方につき施した場合について説明したが、中壁１４のみを補強させてもよい。
【００２９】
【発明の実施の形態２】
上記の矩形断面地中構造物１０の補強構造は、板状鋼材３０の長手方向に伸びる端部に沿って翼部３２を設け、短手方向の断面形状をＨ型若しくはＴ型とした板状鋼材３０を使用したが、図６に示すように板状鋼材３０の上下端部に、さらに板状鋼材３０の長手方向と交差する方向に向けて、鋼板で形成した張出部５０、５０を設けてもよい。
これによって、板状鋼材３０は、剛性が強化され、スリット２０への定着性も向上し、ひいては既設矩形断面地中構造物１０の剪断耐力をより一層向上することができる。
張出部５０には、たとえば基部３１の板幅と同一長さで形成して、基部３１を中心に左右に拡がるものや、上下端部の何れか一方、基部３１を中心に右若しくは左側のいずれか片側のみに拡がる形態などを採用することができる。
なお、この場合スリット２０は、板状鋼材３０の張出部５０も挿入可能なように形成する。
【００３０】
【発明の実施の形態３】
図７を基に、板状鋼材３０の上下端部にアンカー５３で定着する張出部５０を設けた実施例について説明する。
それ以外の翼部３２、３３や張出部５０の形態は、上記した実施の形態１又は２と同様にすることができる。
【００３１】
本形態で使用する板状鋼材３０ｃ、３０ｄは、板状鋼材３０ｃ、３０ｄの上下端部に軸方向に交差する張出部５０ｃ、５０ｄを、板状鋼材３０ｃ、３０ｄの板幅より長く形成し、矩形断面地中構造物１０の中空部へ向けて配置したものである。
すなわち、側壁１３のスリット２０ｃに板状鋼材３０ｃを配置すると、張出部５０ｃは中空部に突出し、他方、中壁１４のスリット２０ｄに板状鋼材３０ｄを配置すると、板状鋼材３０ｄに具備した張出部５０ｄは、左右に配する中空部へ向けて突出する形態となる。
この張出部５０ｃ、５０ｄにはたとえばＨ鋼が使用できる。
【００３２】
所定のスリット２０ｃ、２０ｄへ板状鋼材３０ｃ、３０ｄを配置した後、各張出部５０ｃ、５０ｄに設けた孔へ向けてアンカー５３を打ち込み、矩形断面地中構造物１０のハンチ部に板状鋼材３０ｃ、３０ｄを固定させる。
その後、スリット２０ｃ、２０ｄと板状鋼材３０ｃ、３０ｄとの間隙に充填補強材４０を注入しつつ、露出した張出部５０ｃ、５０ｄを固結材６０でもって被覆してハンチ部へ定着し、矩形断面地中構造物１０と一体化する。ここで、使用する固結材６０には、充填補強材４０と同一のものを使用してもよい。
なお、固結材６０が矩形断面地中構造物１０の建築限界を侵さないよう考慮して、張出部５０を設計する。
【００３３】
以上、本発明は上述したような補強構造であるから、矩形断面地中構造物１０が、たとえば下水施設等に使用され、内空が侵食されている場合にも、効果的な剪断又は曲げ耐力に対しての補強を施すことができるものである。
【００３４】
【発明の効果】
本発明の矩形断面地中構造物の補強構造および補強方法は以上説明したようになるから次のような効果を得ることができる。
＜イ＞本発明の矩形断面地中構造物の補強構造は、矩形断面地中構造物の壁面に長手方向が上下方向となるスリットを設け、このスリットに板状鋼材を挿入し、スリットと板状鋼材との間に補強充填材を注入して、既設矩形断面地中構造物と板状鋼材とを一体化するのみであるため、工事は簡単で、また中壁のみならず、両側壁も補強構造になるため、矩形断面地中構造物全体の耐震性能を向上させることができる。
＜ロ＞また、本発明の矩形断面地中構造物の補強構造は、既設の壁にスリットを設けて、その内部に板状鋼材を挿入し、一体化する構造であるため、中空部への突出が少なくてすみ、建築限界に影響を及ぼさずに補強できるものである。
【図面の簡単な説明】
【図１】本発明の矩形断面地中構造物の補強構造の実施の形態１の説明図。
【図２】図１におけるII−IIの矢視図。
【図３】図１におけるIII−IIIの矢視図。
【図４】側壁に板状鋼材を固定した一例を示す図。
【図５】中壁に各種板状鋼材を挿入した断面図。
【図６】実施の形態２の説明図。
【図７】実施の形態３の説明図。
【図８】従来の矩形断面地中構造物の補強構造を示した図。
【符号の説明】
１０・・矩形断面地中構造物
１１・・上床版
１２・・下床版
１３・・側壁
１４・・中壁
２０・・スリット
３０・・板状鋼材
３１・・基部
３２・・翼部
３３・・翼部
３４・・螺着部
３５・・ボルト
３６・・孔
４０・・充填補強材
５０・・張出部
５３・・アンカー
６０・・固結材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reinforcing structure and a reinforcing method for a rectangular cross-section underground structure.
[0002]
[Prior art]
Tunnels and box culverts having a rectangular cross section such as roads, railways, subways, waterways, sewers, passages, power / gas joint grooves, etc. are shown in FIG. The wide rectangular cross-section underground structure a formed in a box shape includes a rectangular cross-section underground structure a of a type provided with an inner wall f that cuts the hollow portion e left and right.
[0003]
The underground section a having a rectangular cross section disposed underground is forcibly deformed by a surrounding ground that shears and deforms in the width direction in the event of an earthquake. Excessive shearing force and bending moment are first applied to the joints, and to the joints between the floor slabs b and c and the side walls d and d when they are not provided. The ability to support the vertical load on the upper floor slab b is lost, leading to the collapse of the entire rectangular section underground structure a.
[0004]
Therefore, as a method of avoiding this conventionally, for example, a steel damper g is incorporated in advance in the middle wall f or middle pillar of the rectangular section underground structure a, or for the existing rectangular section underground structure a, Commonly known as reinforcement of shear strength or bending strength of existing reinforced concrete structure on side walls d, d, middle wall f, or middle pillar, such as RC reinforcement including addition of band reinforcement, steel sheet winding, etc. The method has been to increase the yield strength.
[0005]
[Problems to be solved by the invention]
However, the conventional reinforcing structure for an existing rectangular cross-section underground structure has the following problems.
<I> When a steel damper that is installed and used in advance is retrofitted to an existing underground structure with a rectangular cross-section, it will be a very large-scale construction, and even if a steel damper is placed only on the middle pillar or wall, it will be rectangular. It will not lead to a significant improvement in the seismic performance of the entire underground structure.
<B> Reinforcement by adding RC or reinforcing steel plates to prevent collapse by increasing the cross section, and may be limited by the construction limit of the underground structure of the rectangular cross section, especially the reinforcing effect, There is a limit to the shear reinforcement effect in the transverse direction.
[0006]
OBJECT OF THE INVENTION
The present invention was made in order to solve the conventional problems as described above, and does not require a large amount of reinforcement work, and can improve the seismic performance of the entire rectangular section underground structure. An object of the present invention is to provide a reinforcing structure and reinforcing method for an object.
Moreover, it aims at providing the reinforcement structure and reinforcement method of a rectangular cross-section underground structure which can improve a shear strength significantly, without receiving the restriction | limiting by the construction limit of a rectangular cross-section underground structure.
The present invention achieves at least one of these objects.
[0007]
[Means for Solving the Problems]
In order to solve the problems as described above, the reinforcing structure of the rectangular section pond structure of the present invention is provided in the longitudinal direction provided on the wall surface connecting the upper floor slab and the lower floor slab of the existing rectangular section underground structure. Is a slit in the vertical direction, a hollow portion into which a projecting portion described later formed in a part of the slit can be inserted, and a plate-like steel material inserted into the slit,
Reinforcing filler that is injected between the slit and the plate-shaped steel material , and at least one of the upper and lower ends of the plate-shaped steel material that projects in a direction that intersects the vertical direction of the plate-shaped steel material The plate-shaped steel material and the rectangular cross-section underground structure are integrated with the reinforcing filler.
[0008]
Further, the reinforcing structure of the rectangular cross-section underground structure of the present invention, in the above-described reinforcement structure of the rectangular cross-section underground structure, the wall includes an inner wall provided in the hollow portion of the rectangular cross-section underground structure It is characterized by.
Here, the inner wall includes an intermittently formed wall in the axial direction of the rectangular cross-section underground structure, for example, one formed in a columnar shape.
[0009]
Further, the reinforcing structure of the rectangular cross-section underground structure of the present invention includes a slit provided on a wall surface connecting an upper floor plate and a lower floor plate of an existing rectangular cross-section underground structure, the longitudinal direction being the vertical direction, and the slit A plate-shaped steel material to be inserted therein, and a reinforcing filler to be injected between the slit and the plate-shaped steel material , along the end extending in the longitudinal direction of the plate-shaped steel material, Providing a wing extending in a direction intersecting the surface , contacting the wing to the opening of the slit, allowing the opening of the slit to be closed by the wing, and functioning as a mold when the reinforcing filler is injected, The plate steel and the rectangular cross-section underground structure are integrated with a reinforcing filler ,
[0010]
Further, the reinforcing structure of the rectangular cross-section underground structure of the present invention includes a slit provided on a wall surface connecting an upper floor plate and a lower floor plate of an existing rectangular cross-section underground structure, the longitudinal direction being the vertical direction, and the slit A plate-shaped steel material to be inserted therein, and a reinforcing filler to be injected between the slit and the plate-shaped steel material , along the end extending in the longitudinal direction of the plate-shaped steel material, Provide wings that spread in the direction intersecting the surface,
The projecting length of the wing is formed to be shorter than the opening width of the slit, and the entire plate steel is configured to fit within the slit, and the plate steel and the rectangular cross-section underground structure with the reinforcing filler. It is characterized by integrating the objects.
[0011]
Further, the reinforcing structure of the rectangular cross-section underground structure is the above-described reinforcing structure of the rectangular cross-section underground structure, in which the overhanging portion faces the hollow portion of the rectangular cross-section underground structure and the plate width of the plate steel material It is formed longer, the overhanging portion and the hunch portion of the rectangular cross-section underground structure are fixed by a fixing means, and a solidified material is integrated with the rectangular cross-section underground structure. is there.
[0012]
Further, in the reinforcing method for constructing the reinforcing structure of the rectangular cross-section underground structure described above, a slit whose longitudinal direction is the vertical direction on the wall surface connecting the upper floor slab and the lower floor slab of the existing rectangular cross-section underground structure Forming the plate-like steel material into the slit, injecting a reinforcing filler between the slit and the plate-like steel material, and consolidating, reinforcing the rectangular cross-section underground structure It is a feature.
[0013]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1
Embodiments of the present invention will be described below with reference to the drawings.
The “upper / lower” used in the description is based on FIG.
[0014]
<I> Overall structure FIG. 1 shows an example of a reinforcing structure of a rectangular section underground structure 10.
In the present invention, the side walls 13 and 13 connecting the upper floor slab 11 and the lower floor slab 12 of the existing rectangular cross-section underground structure 10 including the upper floor slab 11, the lower floor slab 12, the side walls 13 and 13, and the middle wall 14. And the middle wall 14 is reinforced and the shear strength of the horizontal direction of the rectangular cross-section underground structure 10 whole is improved significantly.
The reinforcing structure is installed with an interval in the axial direction of the rectangular section underground structure 10.
The reinforcing structure includes slits 20a and 20b in which the longitudinal direction provided on the side walls 13 and 13 and the middle wall 14 is directed upward and downward from the hollow portion of the rectangular section underground structure 10 and the slits 20a and 20b. The plate-shaped steel materials 30a and 30b to be inserted and the reinforcing filler 40 injected between the slits 20a and 20b and the plate-shaped steel materials 30a and 30b. The plate-shaped steel materials 30a and 30b and the existing rectangular cross section with the reinforcing filler 40 are used. The underground structure 10 is integrated and configured.
In addition, the rectangular cross-section underground structure 10 includes roads, railway tunnels (excavation, submergence, etc.), sewer tunnels, waterway tunnels, underground parking lots, underground station buildings, underground passages, common grooves for electric power / gas / communication, box culverts, etc. In addition, it is a structure to be applied.
Hereinafter, each member will be described in detail.
[0015]
<B> As shown in FIG. 1, the slit slit 20 is formed from the hollow portion of the rectangular cross-section underground structure 10 to the wall surfaces 13 and 14 of the existing rectangular cross-section underground structure 10. It is the space | gap which does not penetrate the outer periphery of the rectangular cross-section underground structure 10 formed toward the outward direction.
The shape of the slit 20 is such that the vertical direction of the wall surfaces 13 and 14 is the longitudinal direction, the wall thickness direction of the rectangular section underground structure 10 is the depth direction, and the axial direction of the rectangular section underground structure 10 is the width direction. Each dimension is formed so that at least a part of the plate-shaped steel material 30 can be inserted.
[0016]
The longitudinal direction of the slit 20 is not limited to the direction in which the upper floor slab 11 and the lower floor slab 12 are vertically connected. For example, when the rectangular cross-section underground structure 10 is disposed obliquely with respect to the ground, the slit 20 20 may be formed obliquely with respect to the vertical direction, that is, the axial direction of the rectangular section underground structure 10.
[0017]
The slits 20a formed in the side walls 13 and 13 are formed so as not to penetrate the side wall 13 (width thickness L3) (FIG. 2A), and the remaining thickness of the side wall 13 at this time is about 10 to 15 cm. It is preferable to leave.
Further, the through slit 20b formed in the inner wall 14 (FIG. 3A) is formed through the inner wall 14.
The cut surface of the slit 20 does not need to be smooth, and may be uneven as shown in FIG. Moreover, the opening shape to the wall surface of the slit 20 is not restricted to the case where it is a rectangle.
[0018]
<C> Plate-like Steel Material Plate-like steel material 30 is arranged on the wall surface 13, 14 of the rectangular cross-section underground structure 10 and is specific to the steel material against the bending moment or shear force extending from the outside of the rectangular cross-section underground structure 10. It resists with the viscosity of, and also prevents collapse when it receives an earthquake exceeding the design assumption.
The plate-shaped steel material 30 is configured, for example, by forming the base portion 31 of flat steel and providing a wing portion 32 that extends in a direction intersecting the formation surface of the base portion 31 along an end portion extending in the longitudinal direction of the base portion 31.
The wing portion 32 is provided at both ends (FIG. 3B) or only at one end (FIG. 2B) along the end portion of the base portion 31, and the cross-sectional shape of the plate steel 3 is H-shaped or T-shaped. And Further, the wing portion 32 may not be configured to expand to the left and right around the base portion 31, but may be configured to expand only to the right or left, and two of them may be used back to back (FIG. 5 (a)).
Furthermore, by forming the overhang length of the wing portion 32 to be shorter than the opening width of the slit 20 described above, the entire plate-shaped steel material 30 having an I-shaped cross section (FIG. 5C) is placed in the slit 20. This makes it possible to provide a reinforcing structure that does not protrude at all from the wall surface.
Further, as shown in FIG. 4, the length of the wing portion 32 may be changed on both sides.
[0019]
When the plate-shaped steel material 30 is formed to have an H-shaped cross section, one wing 33 may be formed separately.
As a connecting method in this case, as shown in FIG. 3B, screwed portions 34, 34,... Are provided on the end surface of the base portion 31 at a predetermined interval, and the screwed portion 34 is attached to the wing portion 33 on the detachable side. It is preferable that holes 36 are formed in accordance with the pitch of these holes and these are connected by bolts 35 through the holes 36.
Further, the wing 33 is connected by welding, or as shown in FIG. 5B, the wing 33 at one end of the plate steel 30 is formed to be smaller than the width of the slit 20 to be opposite to the slit 20. It is good also as a wing | blade part 33 by placing a covering mortar, after projecting from this and arrange | positioning a horizontal reinforcement in this.
[0020]
In addition, you may utilize the wing | blade part 32 as an injection hole of the reinforcement filler 40 mentioned later as length which remove | excluded a part of upper end part of the base 31. FIG.
Further, the plate-like steel material 30 may be a plate-like steel material 30 having only one character in cross section, which is not provided with the wing portion 32 and is composed of only the base portion 31.
[0021]
As mentioned above, although the plate-shaped steel material 30 of the form provided with the wing | blade part 32 extended in the direction which cross | intersects the base 31 surface along the edge part extended in the longitudinal direction of the base 31 was demonstrated centering, the plate-shaped steel material 30 is this form. Without being limited to the above, overhanging portions 50 and 50 that intersect with the vertical direction of the plate-like steel material 30 can be provided at the upper and lower end portions of the base portion 31, and this embodiment will be described in detail in the second and third embodiments. To do.
[0022]
<D> Reinforcing filler The reinforcing filler 40 is injected into the gap between the slit 20 and the plate steel 30 and consolidated to integrate the plate steel 30 and the rectangular section underground structure 10. For example, cement milk, mortar, concrete, resin adhesive, etc. are used.
The reinforcing filler 40 is not limited to the above-described one, and any material can be used as long as the slit 20 formed on the side surface of the rectangular cross-section underground structure 10 and the plate-like steel material 30 inserted into the slit 20 can be integrated. Absent.
[0023]
【Example】
Hereinafter, a reinforcing structure and a reinforcing method for a rectangular cross-section underground structure of the present invention will be described with reference to the drawings.
[0024]
<A> Formation of slits The positions of the slits 20a, 20b, and 20a are determined on the wall surfaces 13, 14, and 13 of the existing rectangular cross-section underground structure 10 to be arranged in the basement.
The yield strength of the rectangular section underground structure 10 can be increased or decreased by the pitch of the slits 20.
The slits 20 are provided at an interval of (0.5 to 1.5) × B in the axial direction of the rectangular section underground structure 10 (B is the entire width in the transverse direction of the rectangular section underground structure 10).
After determining the position, the slit 20 is formed using a known machine such as a cutter, a water jet, or a boring machine.
[0025]
A through slit 20b that penetrates the wall and connects both hollow portions is formed in the middle wall 14, and a slit 20a having a depth from the hollow portion to the middle of the wall thickness is formed in the side wall 13.
At this time, if the inner surfaces of the slits 20a and 20b are formed in an uneven shape, high friction can be expected between the reinforcing filler 40 and the side walls 13 and 14.
[0026]
<B> A T-shaped plate steel plate 31 is fixed in the slit 20a formed on the side wall 13 of the plate steel material (FIG. 2B).
In the through slit 20b formed in the inner wall 14, the member having the base portion 31 of the H-shaped steel plate 30b configured so that one of the wing portions 32 can be separated is disposed first (FIG. 3B).
The base 31 is inserted to the back of the slit 20b, the wing 32 is brought into contact with the opening of the slit 20b, and the H-shaped steel plate 30b is positioned.
The hole 36 of the wing portion 33 is aligned with the screwed portion 34 disposed at the tip of the base portion 31, the bolts 35 are tightened in order to form an H-shaped cross section, and the H-shaped steel plate 30 b is disposed on the inner wall 14.
At this time, if the opening of the slit 20b is designed so that it can be closed by the wings 32 and 33, it becomes an alternative to the mold when the reinforcing filler 40 is injected, which is economical.
[0027]
<C> Reinforcing filler 40 is injected into the gap between the reinforcing filler injection slit 20a and the T-shaped steel sheet 30a and the gap between the through slit 20b and the H-shaped steel sheet 30b to be solidified (FIG. 2C). 3 (c)), the plate-shaped steel materials 30a and 30b and the existing rectangular cross-section underground structure 10 are integrated.
[0028]
Accordingly, the joint portion between the upper and lower floor slabs 11 and 12 and the wall surfaces 13 and 14 can be reliably reinforced without substantially changing the internal dimensions of the existing rectangular cross-section underground structure 10. The underground structure 10 can ensure stable performance against the lateral force received from the ground.
As a result, the reinforcing structure of the present invention only prevents the existing rectangular cross-section underground structure 10 designed based on the seismic design standards at that time from further aging over time and damaging the structural strength. Rather, it is reinforced so that the current seismic design standards that are becoming stricter can be reached and cleared.
As mentioned above, although the case where reinforcement of the rectangular cross-section underground structure 10 was given to both the middle wall 14 and both side walls 13 and 13 was demonstrated, you may reinforce only the middle wall 14. FIG.
[0029]
Second Embodiment of the Invention
The reinforcing structure of the above-described rectangular cross-section underground structure 10 is a plate shape in which a wing portion 32 is provided along an end portion extending in the longitudinal direction of the plate-shaped steel member 30 and the cross-sectional shape in the short direction is H-shaped or T-shaped. Although the steel material 30 was used, the overhang | projection parts 50 and 50 which were formed with the steel plate toward the direction which cross | intersects the longitudinal direction of the plate-shaped steel material 30 further to the upper-lower-end part of the plate-shaped steel material 30 as shown in FIG. It may be provided.
As a result, the plate-like steel material 30 is strengthened in rigidity, improved in fixing property to the slit 20, and as a result, the shear strength of the existing rectangular cross-section underground structure 10 can be further improved.
The overhang 50 is formed, for example, with the same length as the plate width of the base 31 and extends to the left and right around the base 31 and either the upper or lower end, or the right or left side with respect to the base 31 The form etc. which spread only to either one side are employable.
In this case, the slit 20 is formed so that the protruding portion 50 of the plate-like steel material 30 can be inserted.
[0030]
Embodiment 3 of the Invention
Based on FIG. 7, the Example which provided the overhang | projection part 50 fixed by the anchor 53 to the upper-lower-end part of the plate-shaped steel material 30 is demonstrated.
Other forms of the wing parts 32 and 33 and the overhang part 50 can be the same as those of the first or second embodiment.
[0031]
The plate-shaped steel materials 30c, 30d used in this embodiment are formed by extending overhang portions 50c, 50d that intersect the upper and lower ends of the plate-shaped steel materials 30c, 30d in the axial direction longer than the plate width of the plate-shaped steel materials 30c, 30d. The rectangular section underground structure 10 is arranged toward the hollow portion.
That is, when the plate-shaped steel material 30c is disposed in the slit 20c of the side wall 13, the overhanging portion 50c protrudes into the hollow portion. On the other hand, when the plate-shaped steel material 30d is disposed in the slit 20d of the inner wall 14, the plate-shaped steel material 30d is provided. The projecting portion 50d protrudes toward the left and right hollow portions.
For example, H steel can be used for the overhang portions 50c and 50d.
[0032]
After the plate-shaped steel materials 30c and 30d are arranged in the predetermined slits 20c and 20d, the anchor 53 is driven toward the holes provided in the overhang portions 50c and 50d, and the plate-like steel plate is formed in the haunch portion of the rectangular cross-section underground structure 10 The steel materials 30c and 30d are fixed.
Then, while injecting the filling reinforcing material 40 into the gap between the slits 20c, 20d and the plate-like steel materials 30c, 30d, the exposed overhang portions 50c, 50d are covered with the caking material 60 and fixed to the haunch portion, It is integrated with the rectangular section underground structure 10. Here, the same material as the filling reinforcing material 40 may be used as the caking material 60 to be used.
In addition, the overhang | projection part 50 is designed in consideration that the caking material 60 does not invade the construction limit of the rectangular cross-section underground structure 10.
[0033]
As described above, since the present invention is the reinforcing structure as described above, even when the rectangular cross-section underground structure 10 is used in, for example, a sewage facility and the inner space is eroded, effective shear or bending strength is achieved. Can be reinforced.
[0034]
【The invention's effect】
Since the reinforcing structure and the reinforcing method of the rectangular section underground structure of the present invention are as described above, the following effects can be obtained.
<B> The reinforcing structure of the rectangular cross-section underground structure of the present invention is provided with a slit whose longitudinal direction is the vertical direction on the wall surface of the rectangular cross-section underground structure, and a plate-shaped steel material is inserted into the slit, and the slit and the plate Since the reinforcement filler is injected between the steel plates and the existing rectangular cross-section underground structure and the plate steel are simply integrated, the construction is simple and not only the inner walls but also the side walls Since it becomes a reinforcement structure, the seismic performance of the whole rectangular cross-section underground structure can be improved.
<B> In addition, the reinforcing structure of the rectangular cross-section underground structure of the present invention is a structure in which a slit is provided in an existing wall and a plate-shaped steel material is inserted and integrated therein, so that It requires less protrusion and can be reinforced without affecting the architectural limits.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of Embodiment 1 of a reinforcing structure for a rectangular cross-section underground structure of the present invention.
FIG. 2 is an arrow view of II-II in FIG.
3 is an arrow view taken along line III-III in FIG.
FIG. 4 is a view showing an example in which a plate steel material is fixed to a side wall.
FIG. 5 is a cross-sectional view in which various plate-like steel materials are inserted into the inner wall.
6 is an explanatory diagram of Embodiment 2. FIG.
7 is an explanatory diagram of Embodiment 3. FIG.
FIG. 8 is a view showing a conventional reinforcing structure of a rectangular cross-section underground structure.
[Explanation of symbols]
10. ・ Underground structure 11 with rectangular cross section ・ ・ Upper floor slab 12 ・ ・ Lower floor slab 13 ・ ・ Side wall 14 ・ ・ Middle wall 20 ・ ・ Slit 30 ・ ・ Plate steel 31 ・ ・ Base 32 ・ ・ Wing 33 ・-Wings 34-Screwed portions 35-Bolts 36-Holes 40-Filling reinforcement 50-Overhangs 53-Anchors 60-Consolidating materials

Claims (6)

既設の矩形断面地中構造物の上床版と下床版とを連結する壁面に設けた長手方向が上下方向となるスリットと、
スリットの一部に形成した後述する張出部が挿入可能な空洞部と、
前記スリット内に挿入する板状鋼材と、
前記板状鋼材の上下の少なくともいずれかの端部に、前記板状鋼材の上下方向と交差する方向に張出した張出部と、
前記スリットと前記板状鋼材との間に注入する補強充填材と、からなり、
前記補強充填材をもって前記板状鋼材と前記矩形断面地中構造物を一体化したことを特徴とする、
矩形断面地中構造物の補強構造。A slit in which the longitudinal direction provided on the wall surface connecting the upper floor slab and the lower floor slab of the existing rectangular cross-section underground structure is the vertical direction;
A hollow part into which a projecting part described later formed in a part of the slit can be inserted ;
A plate-like steel material to be inserted into the slit;
At least one of the upper and lower ends of the plate steel material, an overhang portion that projects in a direction intersecting the vertical direction of the plate steel material;
A reinforcing filler injected between the slit and the plate steel,
The plate steel and the rectangular cross-section underground structure are integrated with the reinforcing filler,
Reinforcement structure of underground structure with rectangular cross section. 請求項１に記載する矩形断面地中構造物の補強構造において、
前記壁に矩形断面地中構造物の中空部に設けた中壁が含まれることを特徴とした、
矩形断面地中構造物の補強構造。In the reinforcing structure of the rectangular cross-section underground structure according to claim 1,
The wall includes an inner wall provided in a hollow portion of a rectangular cross-section underground structure,
Reinforcement structure of underground structure with rectangular cross section. 既設の矩形断面地中構造物の上床版と下床版とを連結する壁面に設けた長手方向が上下方向となるスリットと、
前記スリット内に挿入する板状鋼材と、
前記スリットと前記板状鋼材との間に注入する補強充填材と、からなり、
前記板状鋼材の長手方向に伸びる端部に沿って、前記板状鋼材の面と交差する方向に拡がる翼部を設け、
スリットの開口部に翼部を当接させ、
スリットの開口を翼部によって閉塞可能として、補強充填材を注入した際の型枠として機能させ、
前記補強充填材をもって前記板状鋼材と前記矩形断面地中構造物を一体化したことを特徴とする、
矩形断面地中構造物の補強構造。 A slit in which the longitudinal direction provided on the wall surface connecting the upper floor slab and the lower floor slab of the existing rectangular cross-section underground structure is the vertical direction;
A plate-like steel material to be inserted into the slit;
A reinforcing filler injected between the slit and the plate steel,
Along the end portion extending in the longitudinal direction of the plate steel material, a wing portion extending in a direction intersecting the surface of the plate steel material is provided,
The wing is brought into contact with the opening of the slit,
The opening of the slit can be closed by the wing, and it functions as a mold when the reinforcing filler is injected,
The plate steel and the rectangular cross-section underground structure are integrated with the reinforcing filler ,
Reinforcement structure of underground structure with rectangular cross section. 既設の矩形断面地中構造物の上床版と下床版とを連結する壁面に設けた長手方向が上下方向となるスリットと、
前記スリット内に挿入する板状鋼材と、
前記スリットと前記板状鋼材との間に注入する補強充填材と、からなり、
前記板状鋼材の長手方向に伸びる端部に沿って、前記板状鋼材の面と交差する方向に拡がる翼部を設け、
この翼部の張り出し長さを、スリットの開口幅よりも短く形成して、板状鋼材の全体がスリット内に収まるよう構成し、
前記補強充填材をもって前記板状鋼材と前記矩形断面地中構造物を一体化したことを特徴とする、
矩形断面地中構造物の補強構造。A slit in which the longitudinal direction provided on the wall surface connecting the upper floor slab and the lower floor slab of the existing rectangular cross-section underground structure is the vertical direction;
A plate-like steel material to be inserted into the slit;
A reinforcing filler injected between the slit and the plate steel,
Along the end portion extending in the longitudinal direction of the plate steel material, a wing portion extending in a direction intersecting the surface of the plate steel material is provided,
The overhang length of this wing part is formed to be shorter than the opening width of the slit, and the entire plate-shaped steel material is configured to fit within the slit,
The plate steel and the rectangular cross-section underground structure are integrated with the reinforcing filler,
Reinforcement structure of underground structure with rectangular cross section. 請求項１に記載する矩形断面地中構造物の補強構造において、
前記張出部を矩形断面地中構造物の中空部へ向けて形成し、
前記張出部と前記矩形断面地中構造物のハンチ部とを定着手段で定着し、
固結材をもって前記矩形断面地中構造物と一体化したことを特徴とする、
矩形断面地中構造物の補強構造。In the reinforcing structure of the rectangular cross-section underground structure according to claim 1 ,
Forming the projecting portion toward the hollow portion of the rectangular cross-section underground structure,
Fixing the overhanging portion and the haunch portion of the rectangular cross-section underground structure with fixing means;
It is characterized by being integrated with the rectangular cross-section underground structure with a consolidated material,
Reinforcement structure of underground structure with rectangular cross section. 請求項１乃至請求項５の何れかに記載する矩形断面地中構造物の補強構造を構築する補強方法において、
既設の矩形断面地中構造物の上床版と下床版とを連結する壁面に、長手方向が上下方向となるスリットを形成し、
前記スリット内に前記板状鋼材を挿入し、
前記スリットと前記板状鋼材との間に補強充填材を注入して固結し、前記矩形断面地中構造物を補強することを特徴とする、
矩形断面地中構造物の補強方法。In the reinforcement method of constructing the reinforcement structure of the rectangular cross-section underground structure according to any one of claims 1 to 5,
On the wall surface connecting the upper floor slab and the lower floor slab of the existing rectangular section underground structure, a slit whose longitudinal direction is the vertical direction is formed,
Insert the plate steel material into the slit,
Injecting and solidifying a reinforcing filler between the slit and the plate-shaped steel material, and reinforcing the rectangular cross-section underground structure,
Reinforcing method for underground structure with rectangular cross section.
JP2002380353A 2002-12-27 2002-12-27 Reinforcing structure and reinforcing method for rectangular section underground structure Expired - Fee Related JP4104453B2 (en)

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JP2009209606A (en) * 2008-03-05 2009-09-17 Shimizu Corp Shear reinforcement structure
JP5553981B2 (en) * 2008-09-29 2014-07-23 公益財団法人鉄道総合技術研究所 Cutting reinforcement for tunnel lining concrete structures
JP6868503B2 (en) * 2017-08-15 2021-05-12 第一カッター興業株式会社 Seismic slit cutting method for inner wall surface of box culvert and seismic slit cutting system used for this
JP6901956B2 (en) * 2017-11-06 2021-07-14 鹿島建設株式会社 Concrete structure

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105421491A (en) * 2015-09-06 2016-03-23 上海建工七建集团有限公司 Construction method for middle wall dismantling and two-side structure connecting

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