相較於其他捷運路線，信義線工程首先合併共同管道施工，因此增添了工程的介面和困難度。共同管道就是把街道上主要的「公共設施管線」集中，便於管理和維修。未來俟捷運信義線完工後，信義路周邊主要管線的修理只要進入「管道」即可，再也不必在大馬路上「開膛破肚」。但是「管道」要怎麼進去呢？有賴一個非常特殊的設計──「特殊部」(SPECIAL SECTIONS)。

　

「特殊部」實際上就是「共同管道」的「出入口」，隨不同需求而有不同功能造型的出入口。信義線共同管道工程自信義路與愛國東路路口起到信義路5段與松德路路口間，共設置22個特殊部，依需要可提供：分歧管線、通風口、人員進出口、接續纜線、提供配電室、設備機房與材料投入口等功能使用。

　

「特殊部」大都設在車站上方及道路交會路口處，施工過程既要注意地面上的交通，更要兼顧工程的實際作業，且因須增加較多開挖面，難免對用路人與民眾的生活作息帶來一些影響。但是從長遠來看，它確實是後續民生需求與道路維護的品質「守護神」。

　

　

MRT Mini-encyclopedia: Special Sections—Common Duct Gateways

Common utility ducts are constructed to integrate all underground public utility lines to facilitate management and maintenance, and “special sections” are designed to serve as their gateways. The Xinyi MRT line is the first example in Taipei MRT construction to be conducted in line with the construction of common ducts.

The integration is certain to create complex interfaces and difficulties during construction. However, once the common ducts are in place, their special sections will be an easy access point for maintenance and repair of public utility lines in the vicinity of Xinyi Road. That means the roads in this area will no longer need to be damaged whenever utility lines require repair or maintenance.



　

　

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