安坑輕軌線跨新店溪安心橋之橋梁配置與設計

Planning and Design of AnShin Bridge, the Ankeng LRT System Xindian River Crossing Bridge

10.6849/SE.202109_36(3).0001

張英發(Teo Eng-Huat)；張志斌(Chang Jhih-Bin)；張容慈(Chang Jung-Tzu)

斜張橋 ； 鋼桁架橋 ； 風洞試驗 ； Cable-Stayed Bridge ； Steel Truss Bridge ； Wind Tunnel Test

結構工程

36卷3期（2021 / 09 / 01）

5 - 23

繁體中文

安坑輕軌計畫位於新北市，為政府積極推動之三環六線之一，路線行經新店及安坑地區，其中跨越新店溪部分之橋梁即為安心橋。因此處路線與新店溪河道以41度角度斜交，並於新店端設置一處轉彎以便進入K9車站（十四張站），使得跨越行水區長度長達500公尺，另受限於行水區內僅能設置兩處橋墩之限制，在橋梁跨度、高度及橋墩斷面尺寸及型式皆須符合軌道系統以及防洪水利需求條件下，安心橋採用國內首見且國外亦少有案例之複合式斜張鋼桁架橋。安坑輕軌安心橋以大跨度不落墩的方式跨越深槽區，採用三跨連續桁架主梁之配置（225m+150m+127m=502m），除可滿足軌道結構物對於變位的要求外，亦可維持轉彎段軌道與結構變位的一致性。本橋受限於橋墩位置，採用單柱式A型傾斜橋塔及雙索面鋼索配置，克服長短跨徑差異產生的不平衡力影響，達到力與美的設計目標。此外，桁架主梁搭配斜張橋之分析與模擬，以及轉彎段與漸變段之鋼桁架設計細節，加上軌道橋梁在設計上須考量的項目，均為本橋有別於一般大跨度橋梁之設計特點。安心橋不論在規模、跨距、量體、工程難度等，均屬國內軌道橋梁首見，本文除就安心橋之規劃設計做整體敘述外，也將針對軌道橋梁所需考量之耐震設計、耐風設計以及構造細節等議題逐一介紹，以提供未來相關工程參考。

Ankeng LRT, located in New Taipei City, is a part of the ＂3 ring & 6 line railway project＂. The route goes through Xindian and Ankeng area, and the section crossing Xindian River is the AnShin Bridge. Since the route crossing Xindian River has a skew with the river channel in 41 degrees, and there is a big turn in the Xindian side in order to enter the K9 station, it makes distance crossing river over 500 m. Moreover, there is a restriction which allows only 2 piers in the Xindian river reservation. In order to fulfill the requirement of the hydrographic as well as the railway system, a cable-stayed and truss composite bridge is used, which is the first in Taiwan and are seldom used in the foreign as well. AnShin Bridge crosses the deep trench area with a big span, a three-span continuous truss girder is used (225m+150m+127m=502m) for the bridge, not only can fulfill the deflection restriction of the railway structure, but also can keep the deformation continuity of the rail and structure at the curve route section. Since the location of the pier is restricted, the A-shaped inclined tower with single pier and the arrangement of the cable was well designed to surmount the imbalanced force due to unbalanced span. Last but not least, the analysis and modeling of the cable-stayed bridge with truss girder, the design detail of the curve and gradient steel truss, and the extra consideration for the railway bridge are some of the design features of AnShin Bridge which is different from the usual. The Anshin Bridge are special not only in the scale, span and design features, but also in the steel details and construction challenge. The design of AnShin Bridge is carried out in this article, some railway bridge design feature including seismic design, wind resistance design as well as the structural detail are also introduced, provide as a reference for the future engineering related project.

1. (1990)。明石海峽大橋主塔の耐風性（主塔斷面形狀の選定）。本四技報，14(54)
2. (1994)。日本東神戶大橋の構造計劃•設計技術開發，平成 6 年 3 月。
3. (2017)。安坑輕軌橋風洞試驗評估報告(委託單位：新亞建設)，106 年 08 月。
4. 日本本州四國連絡橋公團(2001)。日本本州四國連絡橋公團，本州四國連絡橋耐風設計基準同解說，2001 年。
5. 日本道路協會(1979)。鋼道路橋設計便覽。
6. 鐵道總合技術研究所(2012)。鐵道構造物等設計標準•同解說。