{"title":"A STUDY ON PENETRATION BEHAVIOR TO ROCK FRACTURES OF CEMENT GROUT BY FIELD TEST","authors":"Y. Uchita, Kiyoji Hasumoto, Takesi Tamai, Noboru Oguma, K. Kanto","doi":"10.2208/JSCEJF.63.295","DOIUrl":"https://doi.org/10.2208/JSCEJF.63.295","url":null,"abstract":"岩盤割れ目を対象としたセメントグラウチングの室内試験結果を検証するために実施した現場試験で，1）注入孔内の固化グラウト中に数カ所の空洞等が観察され，ボーリング孔と割れ目の交差部（割れ目入口）での目詰まり現象が現場でも確認された，2）現場では注入圧力により割れ目幅が変化し，グラウトの浸透と割れ目幅の関係は室内試験ほど単純ではないが，0.3mm以下の割れ目幅では改良範囲が狭く，効率的ではない，3）低次数の注入ほど，選択的に大きな割れ目に注入され，グラウトの浸透範囲が大きく，注入によるLu値の改良効果が良い．一方，高次数の注入ほど，割れ目幅を拡大させる傾向があり，浸透範囲も小さく，改良効果が悪い，4）従来より濃い初期配合（C:W=1:4,1:2）から注入開始しても改良効果に問題はなく，注入時間の短縮になる等が明らかとなった．","PeriodicalId":245964,"journal":{"name":"Doboku Gakkai Ronbunshuu F","volume":"523 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126023222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"STRESS MEASURMENT FOR THE BRIDGE SUSPECTED OF FATIGUE DAMAGE","authors":"C. Miki, Keigo Suzuki, K. Ono, Y. Yaginuma","doi":"10.2208/JSCEJF.66.337","DOIUrl":"https://doi.org/10.2208/JSCEJF.66.337","url":null,"abstract":"単弦ローゼ桁橋の鉛直材が鋼床版に貫通する溶接部位において，疲労損傷の疑いを持つき裂が発見された．これらのき裂は溶接割れか疲労を原因とする可能性が高く，特に後者の場合は適切な対策が必要となる．本研究は，き裂の原因を特定し，そのメカニズムを明らかにすることを目的として，コア抜き調査と応力測定を行った．コア抜き調査の結果，ルート部に未溶着部の存在が確認され，また破面観察からは疲労き裂の疑いのある破面が見られた．応力測定では，活荷重のレベルとその作用位置に対する応答に着目し，活荷重が損傷部位に及ぼす影響を明らかにした．","PeriodicalId":245964,"journal":{"name":"Doboku Gakkai Ronbunshuu F","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125086816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"THE DESIGN TECHNIQUE OF THE CUT AND COVER TUNNEL IN CASE OF REMOVING A BRACE BY THE METHOD OF REPLACEMENT OF BRACE REACTION USING SIDE WALL","authors":"Keisuke Kawamata, H. Sako, Hiroaki Hasegawa, Atsushi Shimura, T. Nakashima","doi":"10.2208/JSCEJF.63.469","DOIUrl":"https://doi.org/10.2208/JSCEJF.63.469","url":null,"abstract":"開削トンネル構築時の山留め支保工撤去方法として，“側壁盛替え方式”による支保工撤去が行われる場合がある．しかし，現在は本方式を用いる際の躯体応力度の評価方法として確立されたものはない． 本論文では，側壁盛替え方式による山留め支保工撤去を行う場合の躯体設計手法を提案し，側壁盛替時の躯体設計を試みている．この設計手法は，躯体構築時の側壁盛替えにより発生する応力がコンクリート特有のクリープ特性により緩和されることを取り入れ，躯体完成後の長期間に渡り残留する応力を評価する逐次的分離計算法である．","PeriodicalId":245964,"journal":{"name":"Doboku Gakkai Ronbunshuu F","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123537484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"STRESS DIAGNOSIS METHOD OF BENT PIPE BASED ON THE SECTION FLATNESS OF THE TANGENT PIPE SUBJECT TO BENDING","authors":"S. Iimura, Hiroki Yamaguchi","doi":"10.2208/JSCEJF.65.567","DOIUrl":"https://doi.org/10.2208/JSCEJF.65.567","url":null,"abstract":"曲管に外力が作用すると曲管の断面は大きく扁平することから，曲管に接続されている袖官にも扁平が伝達することとなる．本研究では，他の埋設物などが存在し，曲管の断面扁平量の測定ができないことを前提として，曲管に接続される袖管に発生する扁平の大きさから曲管の扁平量を推定する手法を開発するために，外力が作用したときの曲管および袖管に生じる扁平量を明らかにする実験を行い，実験を説明することのできる薄肉シェル要素を用いた弾性FEM解析を行った．その結果，実験と解析とは良好な一致が見られたことから，使用頻度の高い90°よりも小さい開き角度の曲管に接続された袖管の扁平量と応力の関係をFEM解析から求め，袖管部断面扁平量から種々の開き角度を有す曲管の応力を推定する方法を提案した．","PeriodicalId":245964,"journal":{"name":"Doboku Gakkai Ronbunshuu F","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121492303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"AN INTRODUCTION AND THE POSSIBILITY OF THE PARTICIPATORY BIDDING SYSTEM IN PUBLIC WORKS","authors":"Shin-ei Takano, Kimiyoshi Kurauchi, Masayoshi Araki","doi":"10.2208/JSCEJF.65.284","DOIUrl":"https://doi.org/10.2208/JSCEJF.65.284","url":null,"abstract":"本研究は公共工事の入札制度が抱える問題点を踏まえ，住民が当事者意識を持ちつつ，内容を理解しやすい公共工事に対して，住民参加型入札制度の導入を提唱し，模擬入札実験を通して，その可能性を検証したものである． まず，アンケート調査の結果，住民は工事を行うにふさわしい業者として，価格以上に質を重視し，発注者が求めるものと大差がない一方，公共工事の入札に対する印象は不信感が強いことを明らかにした．次にその解決にあたり，住民参加型入札制度を提唱し，その効果と課題を考察した上で，模擬入札実験を行い，住民は一定条件の下では建設業者を合理的に評価することが可能である，本制度の適用により，入札制度に対する意識が変化する可能性がある等の結論を得，住民参加型入札方式が入札制度の改善に有効な方法である可能性を示した．","PeriodicalId":245964,"journal":{"name":"Doboku Gakkai Ronbunshuu F","volume":"381 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122076092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Kemmochi, E. Taketsu, J. Yorita, M. Koike, K. Kamemura
The relationship between initial displacement and converged one, which has been used to judge the convergence and the time for execution of tunnel supports, is conventionally evaluated to be one linear line. Though, the actual situation of convergence during tunneling is influenced by the bench length. In order to construct tunnel more safely and rationally, tunnel convergence should be predicted accurately and be controlled by tunneling method. In this paper, the effects of tunneling methods to the relationship between initial displacement and converged one are analysed based on the convergence data, measured in the sqeezing rock tunnel. Also, qualitative evaluation using 3D numerical analysis is carried out.
{"title":"A STUDY ON THE EFFECT OF TUNNELING METHODS TO THE CONVERGENCE OF TUNNEL IN SQUEEZING ARGILLACEOUS ROCKS","authors":"S. Kemmochi, E. Taketsu, J. Yorita, M. Koike, K. Kamemura","doi":"10.2208/JSCEJF.63.225","DOIUrl":"https://doi.org/10.2208/JSCEJF.63.225","url":null,"abstract":"The relationship between initial displacement and converged one, which has been used to judge the convergence and the time for execution of tunnel supports, is conventionally evaluated to be one linear line. Though, the actual situation of convergence during tunneling is influenced by the bench length. In order to construct tunnel more safely and rationally, tunnel convergence should be predicted accurately and be controlled by tunneling method. In this paper, the effects of tunneling methods to the relationship between initial displacement and converged one are analysed based on the convergence data, measured in the sqeezing rock tunnel. Also, qualitative evaluation using 3D numerical analysis is carried out.","PeriodicalId":245964,"journal":{"name":"Doboku Gakkai Ronbunshuu F","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130478437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A STUDY ON THE CAUSE OF THE CABLE OVERLAY PIPE MELTING DAMAGE BASED ON THE FIELD OBSERVATION OF THE YOKOHAMA BAY BRIDGE","authors":"Y. Yamamoto, H. Hanno, Hitoshi Yamada, Wataru Hirase, Toru Hayakawa","doi":"10.2208/JSCEJF.65.381","DOIUrl":"https://doi.org/10.2208/JSCEJF.65.381","url":null,"abstract":"横浜ベイブリッジの供用後，下層に一般国道357号の桁が架設された．その直後の定期点検において，ケーブル定着部のケーブルの角折れを防止する緩衝装置の付近に，ポリエチレン被覆の融解した損傷が発見された．この原因を究明するため，損傷部の詳細点検に加えて，実橋のケーブル振動，気象データ，および緩衝装置付近のポリエチレン被覆の温度変化について，約1年間の観測を実施し，損傷原因の考察を行った．その結果，下層の桁の載荷により，緩衝装置付近のケーブル上面に接触面圧が作用した状態で，風速限定型振動のレインバイブレーション現象が発現し，緩衝装置の緩衝ゴムとの接触部に摩擦による発熱が生じて，ポリエチレン被覆の融解損傷が生じた可能性のあることが明らかとなった．","PeriodicalId":245964,"journal":{"name":"Doboku Gakkai Ronbunshuu F","volume":"278 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116522832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"EXPERIMENTAL STUDY ON DEFORMATION MECHANISM OF ASHLAR MASONRY WALLS DURING AN EARTHQUAKE","authors":"N. Ota, T. Sugiyama, K. Okada, M. Toriihara, Akira Yamamoto, Y. Yamada","doi":"10.2208/jscejf.62.213","DOIUrl":"https://doi.org/10.2208/jscejf.62.213","url":null,"abstract":"材料の入手が容易なために，鉄道沿線の切土のり面の防護や盛土ののり尻に設けられることが多い石積壁は，開業当時に造られて，今も供用されている．このような石積壁は，通常標準図をもとにして造られることが多いが，昭和初期以前に造られたものについては，その構造が明らかでない．また，その構築方法は，専門職の技能と経験によって発達してきているため，特に，耐震性能については未解明な部分が多い．このような特徴を有する石積壁の実態調査を行い，鉄道沿線に現存する石積壁の標準的な構造を明らかにした．また，この標準的な石積壁を対象として模型振動台実験を行った．積み方（空積および練積），高さ，基礎に働く水平抵抗に着目し，地震時の挙動に及ぼす影響と変形発現のメカニズムを明らかにした．","PeriodicalId":245964,"journal":{"name":"Doboku Gakkai Ronbunshuu F","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129935679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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