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機場捷運軌道工程軌道線形檢測簡介 Introduction to TIAA MRT Construction Track Alignment Survey
正線軌框線形調整

機場捷運軌道工程線形之設計概分為水平及垂直線形兩種,正線之水平線形設計大致為圓曲線前後以緩和曲線連接直線段,側線及機廠部分之水平線形設計則為圓曲線與直線連接;至垂直線形之設計,均以豎曲線連接直線縱坡為之。
軌道標現場測量工作分為控制測量及施工測量兩種,因軌道工程為土建工程之接續工作,為避免車站結構侵入淨空,當土建標將測量資料移交軌道標後,軌道標須再進行控制點及水準點檢測。控制點測量為平面位置之控制,主要採車站區土建移交控制點為起始邊及閉合邊之複合導線測量方式;水準檢測原則上固定車站水準點高程,以精密水準儀採直接水準往返車站觀測。
軌道鋪設前則需進行施工測量,依據線形資料之各導線點座標先完成路線中心放樣,進行後續軌框組立作業,於軌框組立作業完成後,就已完成之路線中心座標及高程進行抽測。軌道鋪設期間,使用Leica GRP1000軌道檢測車搭配裝載伺服馬達之全測站經緯儀,快速架站並即時顯示成果供現場調整,每次架站或換站時輔以直接水準點高程,量測鋼軌踏面高程與檢測車數據,比對無誤再進行檢測,以確保高程之正確性。
軌床澆注混凝土前,再以軌道檢測車進行鋼軌線形及高程檢測,經檢測合格後,進行澆注混凝土澆置作業。最後,於舖軌完成及最終線形調整完成後,進行全線竣工測量,確認軌道之軌距、平面定線及垂直定線正確無誤。

The track alignment design of TIAA MRT construction includes horizontal and vertical alignment. The horizontal alignment of the main track is designed as circular curves wrapped by spiral curves at both ends and then connected to the linear section. For side tracks and depot tracks, the horizontal alignment is designed as circular curves and linear sections intertwined with vertical curves connecting the linear gradients.
On-site measuring tasks include control survey and construction measurement. As track construction is the following construction to civil engineering, when transferring measurement data from civil engineering tender to track construction tender, control point and bench mark (B.M.) surveys should be performed to avoid station structure invasion. Control point measurement is performed to control surface area location. The measurement method adopted compound traverse survey in which considered the civil engineered transfer control points of station area as the starting side/closure side. As for leveling surveys, the station top B.M. is fixed and we adopted the direct leveling method using a precise automatic level measuring to and fro the station.
Prior to track construction, necessary construction measurements are performed. To complete such measurements, the first step is to set out center tracks according to traverse coordinates from the alignment data. Then, proceed on the track panel assembly and complete the route center coordinates and elevation random checks. Throughout the track construction period, Leica GRP 1000 Track Measuring Trolley and Total Station Theodolite on the loading server motor are used for on-site measurements. The equipment would be quickly set up as a measurement point and could display immediate measuring results for on-site adjustment. When setting up or transferring a measurement point, it would be directly leveled in which the tread surface height would be compared with trolley statistics. The survey will only continue when the comparison is correct to assure the accuracy of elevated height.
Before pouring concrete onto the track bed, track alignment and elevation tests should be performed by track measuring trolleys. After the test results are confirmed to meet standard, the concrete pouring process could then proceed. Finally, after rail laying and the final alignment adjustment are completed, general construction survey is conducted to assure rail gauge, horizontal alignment and vertical alignment are correct and accurate.

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