THE ESTIMATION OF IRON MEMBER CORRORSION IN A SHIELD TUNNEL AND THE DESIGN OF REINFORCEMENT

シールドトンネルの鉄筋残存量の評価と補強設計に関する研究

At a shield tunnel constructed in a soft ground, a severe case, that the inner space of the tunnel is reducing by the decrease of rigidity of a segment which suffers from salt damage and increasing ground load, is found. One of the ways to reinforce such a tunnel is to increase the rigidity of shield tunnel lining by constructing pillars in the tunnel. For designing the pillars, however, it is necessary to predict how much the rigidity of the segment could weaken and to make a model for a composite structure of segments and pillars. In this paper, it is discussed that the statistic estimation of remaining amount of main iron members at a shield tunnel suffering from salt damage. Moreover, how to reflect the model based on the statistic result to the design of pillars is discussed.　軟弱地盤中に建設したシールドトンネルで，圧密沈下による見かけ上の荷重増加やセグメントフラットバーの塩害によるセグメントの剛性低下から，トンネルの内空が減少している事例がある．この対策の一つに，トンネルの内空に補強用の柱体を構築し，トンネルの覆工体としての剛性を高めるものがある．しかしながら，柱体の設計を行う上で，塩害に伴うセグメントフラットバーの残存量の評価，およびセグメントと柱体の複合構造物としての構造モデルの構築が課題であった．そこで本論文では，塩害が発生したシールドトンネルのセグメントのフラットバーの残存量評価手法について論ずる．フラットバーの将来残存量の設定をもとにした荷重モデルと，これにともなう構造モデルの構築方法についても論述する．

• Record URL:
  https://doi.org/10.2208/jscejte.72.I_108
• Record URL:
  http://scholar.google.com/scholar_lookup?title=THE%20ESTIMATION%20OF%20IRON%20MEMBER%20CORRORSION%20IN%20A%20SHIELD%20TUNNEL%20AND%20THE%20DESIGN%20OF%20REINFORCEMENT&author=S.%20OKA&author=K.%20ANAN&author=T.%20JITSUHIRO&author=M.%20YOSHIMOTO&publication_year=2016
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/21856575
• Authors:
  • OKA, Shigeaki
  • ANAN, Ken-ichi
  • JITSUHIRO, Takushi
  • YOSHIMOTO, Masahiro
• Publication Date: 2016

Language

• English
• Japanese

Media Info

• Media Type: Web
• Pagination: pp I_108-I_122
• Serial:
  • Journal of Japan Society of Civil Engineers, Ser. F1 (Tunnel Engineering)
  • Volume: 72
  • Issue Number: 3
  • Publisher: Japan Society of Civil Engineers
  • ISSN: 2185-6575
  • Serial URL: https://www.jstage.jst.go.jp/browse/jscejte/-char/en

Subject/Index Terms

• TRT Terms: Columns; Material reinforcement; Shields (Tunnels); Stiffness
• Subject Areas: Bridges and other structures; Construction; Highways;

Filing Info

• Accession Number: 01633695
• Record Type: Publication
• Source Agency: Japan Science and Technology Agency (JST)
• Files: TRIS, JSTAGE
• Created Date: Apr 28 2017 4:51PM