新北市三鶯二橋新建工程之規劃設計與施工

近年來新北市政府極力發展各項建設及推動觀光，土城區、樹林區、三峽區及鶯歌區之交通量成長快速，面對交通建設急迫性、道路安全需求性、瓶頸路段改善及觀光發展區聯外道路需求等因素，必須積極因應與改善。其中，三鶯大橋為鶯歌與樹林通往三峽市道110與國道3號三鶯交流道之重要聯絡橋梁，由於現況交通服務水準尖峰時間已達到F級，為積極改善此交通瓶頸，新北市政府推動三鶯二橋新建工程（以下稱本工程），銜接台北大學特定區內之40m道路（大義路），以分擔市道110及三鶯大橋之車流。三鶯二橋的規劃路線，於穿越國道3號、跨越大漢溪及台鐵軌道後，以迴轉方式銜接市道114，在穿越國道路段，採用國內首創倒T型預鑄預力梁，爭取橋下淨高並加速橋梁施工，確保國道交通維持的順暢。跨越大漢溪與台鐵軌道，採大跨徑鋼箱型梁橋設計，克服汛期與鄰接鐵路施工的風險。本文旨在提出本工程的設計考量與施工經驗，期對國內工程界有一建設性的參考。

關鍵字

密排倒T型預鑄預力梁；橋梁快速施工；跨越鐵路施工

並列摘要

In recent years, New Taipei City Government has made great efforts to develop various constructions and promote tourism. The rapid growth of traffic volume in Tucheng District, Shulin District, Sanxia District and Yingge District must be actively responded and improved, facing the factors such as urgency of transportation construction, road safety requirements, bottleneck section improvement and the demands for access roads to tourism-developing districts. Among other things, the Sanying Bridge is an important one connecting Yingge and Shulin to Sanxia City Road No.110 and Sanying Interchange of National Highway No. 3. As the current service level of traffic has reached F-level during peak hours, in order to actively improve the traffic bottleneck, New Taipei City Government promotes the construction of the Sanying Second Bridge (hereinafter referred to as this project) to connect the 40m road (Dayi Road) in the Designated Area of Taipei University to share the traffic flow of City Road No. 110 and the Sanying Bridge. The planned route of the Sanying Second Bridge connects City Road No. 114 in a turning manner after crossing National Highway No. 3, the Dahan River and the track of Taiwan Railway. It adopts the first domestic inverted T-shaped, precast and prestressed beam to strive for the clearance under the bridge and to boost construction to ensure maintaining smooth traffic of national highway. By using large-span steel box girder for the bridge to cross the Dahan River and the track of Taiwan Railway, the design overcomes the risks of construction during the flood season and railway adjacency. This article aims to provide the design considerations and construction experience of this project which is expected to give a constructive reference to the domestic construction community.