Newsletter 高速鐵路簡訊 . 交通部高速鐵路工程局
高速鐵路南港延伸段鋼軌銲接作業 Rail Welding Operations of the HSR Nangang Extension Line
大坑溪前引道銲軌基地之電阻火花銲接。

高速鐵路南港車站已於105年7月1日通車營運。南港延伸段軌道工程範圍從台北車站北端既有之軌道末端開始至南港車站末端結束,里程自(1K+000)至-(3K+583),鋼軌採JIS60斷面(Profile)。鋼軌銲接程序大致如下:在鄰近大坑溪的隧道口出土引道段設置銲軌基地,將25公尺長的定尺鋼軌以電阻火花銲接(Flash-Butt Welding,FBW)連接成200公尺的長鋼軌。電阻火花銲接是利用銲接機以高壓電流將兩鋼軌端部熱熔,再施加軸向壓力將兩鋼軌端部擠壓熔接,整個銲接過程均採電腦設定自動操控。
南港延伸段銲軌基地的電阻火花銲接施作共有822個銲口,每一銲口均需經過四道手續的研磨,將鋼軌面研磨平整,平整度(1.5公尺範圍)要求為:軌頭及內側0~+0.2mm;軌足<1mm。以手持超音波探傷設備(UT)和磁粉探傷設備(MT)檢測銲接品質,並於距離銲口20公分處噴塗編號。將200公尺長鋼軌移至現場施工,與軌枕、扣件組成軌框後澆置混凝土。
至於200公尺長鋼軌間所留之軌縫及與道岔區段的鋼軌連結,則採用鋁熱銲接(Thermit-welding,TW)方式,以坩鍋融化熱劑銲料後流入鑄模以結合鋼軌,完成後仍需進行銲口平整度與銲口品質檢測。鋁熱銲接作業共計342銲口,將臺北車站以北至南港車站末端全線9.5公里長路段形成連續長銲鋼軌。

The HSR Nangang Station started operation on Jul. 1, 2016. Nangang extension line construction adopted the JIS60 profile rails and started from the north end of Taipei Main Station to the end of Nangang Station, in other words from (1K+000) to -(3K+583). The rail welding procedure is outlined as follows: the rail depot is set at the daylighting section in the vicinity of Dakeng River, then, 25-meter standard length rails are welded via flash-butt welding (FBW) into 200-meter long rails. The FBW method uses the welding machine to melt the ends of the two rails via high-voltage current then applies axial pressure on the ends for extrusion and welding. The entire welding process is automatically controlled via computer settings.
There are a total of 822 weld craters generated via FBW in the rail depot of the Nangang extension line. Each crater must go through four grinding procedures to reach the smoothness requirements (1.5-meter range): 0 ~ + 0.2mm for rail head and gauge side; <1mm for rail foot. The welding quality will be determined by hand-held ultrasonic flaw detectors (UT) and magnetic detection equipment (MT) and the rail number will be sprayed on the rail at 20 cm away from the crater. Finally, the 200-meter long rails will be moved to the construction site to assemble with sleepers and fastenings forming track frames and concrete will be poured subsequently.
As for the gap in between 200-meter long rails and the connecting points with turnouts, the thermit-welding (TW) method is utilized which melts the solder agent via a crucible and then lets the agent flow into the mold to bind the rail. This process also requires smoothness and quality check of the craters upon completion. There are a total of 342 craters generated via TW method connecting a 9.5-meter consecutive long rail from Taipei Main Station to the north end of Nangang Station.

  • 隧道內鋁熱銲接。
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