Page 28 - 捷運技術 第52期
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24 張榮峰、彭琇康、周忠仁、于中原 球狀石墨鑄鐵環片於臺北捷運潛盾隧道之應用
球狀石墨鑄鐵環片於臺北捷運潛盾隧道之應用
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張榮峰 彭琇康 周忠仁 于中原 4
摘要
目前國內捷運工程之潛盾隧道多採用厚度25cm之預鑄混凝土環片，然而在近接隧道、
穿越建物、聯絡通道開挖等特殊隧道工程案例中，隧道鑽掘過程造成地層擾動與解壓效應將
使隧道環片承受額外之應力與變形，容易造成混凝土環片因受不對稱外力偏壓，產生不均勻
變形而開裂。球狀石墨鑄鐵環片相較於混凝土環片具有高強度以及良好之抗彎矩及變形能
力，且在耐久性、抗電蝕性、製造精度等相關性能上亦較鋼環片為優異，故引進供國內隧道
工程使用。本文概述球狀石墨鑄鐵環片之材料特性、構造概要、設計方法、鑄造及檢驗流程
等，並介紹臺北捷運於松山線近接隧道首次採用球狀石墨鑄鐵環片之設計案例，包括分析設
計、施工規劃及監測回饋等，供未來相關工程參考。
關鍵詞：鑄鐵環片、臺北捷運松山線、近接隧道
Application of Ductile Segments for the Bored Tunnels of
Taipei MRT System
Jung-Feng Chang Hsiu-Kang Peng Chung-Ren Chou Chung-Yuan Yu 4
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Abstract
Precast concrete segments which are 25 cm in thickness have been adopted for the bored
tunnels of Taiwan’s MRT system. In some special tunnel boring cases, such as in close-spaced
tunnels, tunnels passing underneath existing buildings, and cross-passage excavations, additional
earth pressure and deformation caused by ground disturbances and stress release may act against
the lining segments, accordingly, the asymmetrical pressure results in non-uniform deformation and
cracks on the concrete segments. The spherical graphite cast iron segment (or ductile segments)
demonstrates higher strength and better anti-deformation features than the concrete segment, and
it has better durability, anti-corrosion, and manufacturing accuracy when compared with the steel
segment, thus it has been introduced to the tunnel industry in Taiwan. This paper first provides a
briefing on the material characteristics, structural conformation, design methodology, casting, and
inspection procedures for the ductile segments. It then illustrates the case study of close-spaced
tunnels for the Songshan line where ductile segments were first adopted in the Taipei MRT projects,
including analysis and design, construction planning, and monitoring feedback. It also provides
references for similar projects in the future.
Keywords: ductile segments, Taipei MRT Songshan line, close-spaced tunnels
1 亞新工程顧問股份有限公司正工程師 jungfeng.chang@maaconsultants.com
2 亞新工程顧問股份有限公司正工程師 hk.peng@maaconsultants.com
3 亞新工程顧問股份有限公司副理 danny.cr.chou@maaconsultants.com
4 臺北市政府捷運工程局土木建築設計處副工程司 cyyu@dorts.gov.taipei
