Newsletter 高速鐵路簡訊 . 交通部高速鐵路工程局
臺北車站(A1)N10鋼質彈簧道床施工簡介 Introduction to the Steel Spring Slab Track Installation in N10 Section of Taipei Main Station (A1)
臺北車站(A1)N10振動敏感區軌道之菱形岔心完成現況

機場捷運位於臺北車站(A1)振動敏感區N10之浮動道床採用鋼質彈簧做為減振材料,包括正線一般段、正線與側線間左右道岔及交叉橫渡線等。鋼質彈簧包含一個套筒及彈簧單元,套筒置入浮動道床混凝土道版中,彈簧單元為一螺旋鋼彈簧放置於套筒內,並以油壓千斤頂壓縮彈簧,以逐步調整達到所需高度。
依據設計「鋼質彈簧系統-GERB」可使本區段N10浮動道床之動態需求(自然頻率)達到8Hz。另由於N10浮動道床的自然頻率較低,列車行駛時相鄰道床版間之變位可能過大,進而造成鋼軌及扣件系統負荷超過可接受的程度,因此另發展輔助鋼軌系統連接相鄰道版間以增加垂直勁度,並確保列車行駛時之穩定性及安全性。
本N10軌道包含直線軌1,076公尺及8組道岔及1組菱形岔心,軌道斷面構造由軌踏面往下包括:鋼軌、扣件系統、雙塊式軌枕、鋼質套筒、場鑄混凝土道床、止動塊、輔助鋼軌、側向支承墊等元件。其主要施工步驟依序為:測量放樣、止動塊施工、軌框組立、限位器安裝、隔離布安裝、套筒安裝、鋼筋綁紮、輔助軌預埋件安裝、模板組立、混凝土澆置、防護緣石內模組立、防護緣石混凝土澆置、彈簧內筒安裝及頂升、輔助鋼軌鎖固等。
ME01標軌道廠商於102年7月30日進場施工,軌床混凝土澆置作業於103年1月8日完成,一般軌及道岔頂升作業於4月15日完成,其餘施工項目如鋁熱焊接及止衝擋於4月29日安裝完成。

The vibration control method of the vibration-sensitive N10 section in TIAA MRT Taipei Main Station (A1) adopted steel springs to support a long section of floating slab track which is inclusive of plain lines, left & right hand turnouts, diamond crossing, etc. Each steel spring unit consists of a sleeve unit and a spring unit. To install the steel spring unit, first, set the sleeve unit into the concrete slab of the floating slab track; then, insert the steel spring unit into the sleeve and apply pressure by a hydraulic jack to the spring until it reaches the desired height.
By adopting the Steel Spring System-GERB, the dynamic requirements (natural frequency) of 8Hzfor the N10 floating slab tracks can be met. The natural frequency of N10 floating slab track is relatively low, so the relative displacement of neighboring slabs may be too large during operation of trains causing the steel rail and fastening system pressures to exceed acceptable levels. Therefore, the auxiliary rail system was adopted to connect neighboring slabs which will enhance its vertical strength and ensure the stability and safety of train operation.
The N10 section includes 1,076m of tangent rail, 8 turnouts and 1 diamond crossing. The rail profile structure from the tread surface down includes steel rail, fastenings, twin-block sleeper, vibration-isolating sleeve, scaffolding concrete slab track, buffer stop, auxiliary rail and track panel assembly. The main construction procedures are (in order): measurements and setting, buffer stop installation, track panel assembly, base dowel installation, isolation cloth installation, housing installation, reinforcement banding, auxiliary rail pre-burying parts installation, moldboard assembly, concrete pouring, interior film assembly of protection curb, protection curb pouring, interior sleeve installation and jacking of spring unit, auxiliary rail locking, etc.
The rail constructor of ME01 Tender has commenced construction since Jul. 30 2013. By Jan. 8, 2014, the rail bed concrete pouring procedure was completed and by Apr. 15, the normal track installation and turnout lifting processes were also completed. Finally, by Apr. 29, the remaining construction items such as thermit welding and buffer stops installation were all completed.

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