Development and Application of Cross-Section Repair Method for Culvert Tunnels of Metropolitan Railways

都市鉄道のカルバートトンネルを対象とした断面修復工法の開発と展開

The rational maintenance of the large number of concrete structures built during Japan's period of high economic growth is becoming necessary, and the concrete degradation of railway tunnels such as subway tunnels has become an issue. As cross-section repair of railway tunnels can take place only at night when train service stops, the time period from repair work completion to service start is short. Thus, cross-sectional repair materials must provide good strength development and reliable workability. This report describes laboratory and field experiments for the application of a cross-sectional repair method that sprays freshly mixed mortar to which curing accelerator has been added for the repair of railway tunnels, and reports the recorded improvement in strength development of the cross-section repair material at early ages. Through the appropriate combination of quick hardening material and curing accelerator, the developed cross-section repair method secures trowel finishing time of 15 minutes, and compressive strength exceeding 5 N/mm² after 3 hours was recorded.高度成長期を経て，これまで多量に建設されたコンクリート構造物の合理的な維持管理が必要となっており，近年においては地下鉄などの鉄道トンネルでのコンクリート劣化が問題となっている。鉄道トンネルの断面修復工事では，電車が止まっている夜間での工事であることから，施工終了から供用までの時間が短い。このことから，断面修復材には良好な強度発現とともに，確実な施工が求められる。本稿は，練り混ぜたモルタルに硬化促進剤を混合させて吹き付ける断面修復工法を鉄道トンネルの補修に適用するために，室内実験やフィールド実験を行い，材齢初期における断面修復材の強度発現性状を改善した内容について取りまとめた。開発した断面修復工法では，急硬材および硬化促進剤などを適切に組み合わせることにより，コテ仕上げ可能時間15分を確保しつつ，材齢3時間では5 N/mm²を超える圧縮強度を得られることを確認できた。

• Record URL:
  https://doi.org/10.3151/coj.54.2_149
• Record URL:
  http://scholar.google.com/scholar_lookup?title=Development%20and%20Application%20of%20Cross-Section%20Repair%20Method%20for%20Culvert%20Tunnels%20of%20Metropolitan%20Railways&author=A.%20Hirama&author=K.%20Fukui&author=Y.%20Kawabata&author=T.%20Yamagishi&publication_year=2016
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03871061
• Authors:
  • Hirama, A
  • Fukui, K
  • Kawabata, Y
  • Yamagishi, T
• Publication Date: 2016

Language

• English
• Japanese

Media Info

• Media Type: Web
• Pagination: pp 149-155
• Serial:
  • Concrete Journal
  • Volume: 54
  • Issue Number: 2
  • Publisher: Japan Concrete Institute
  • ISSN: 0387-1061
  • EISSN: 2186-2753
  • Serial URL: https://www.jstage.jst.go.jp/browse/coj

Subject/Index Terms

• TRT Terms: Aging (Materials); Compressive strength; Concrete curing; Concrete structures; Economic growth; Maintenance; Railroad tunnels; Sprayers; Subways
• Geographic Terms: Japan
• Subject Areas: Bridges and other structures; Maintenance and Preservation; Materials; Railroads;

Filing Info

• Accession Number: 01626991
• Record Type: Publication
• Source Agency: Japan Science and Technology Agency (JST)
• Files: TRIS, JSTAGE
• Created Date: Feb 27 2017 9:38AM