Newsletter 高速鐵路簡訊 . 交通部高速鐵路工程局
機場捷運延伸線A22-A21下行線潛盾機到達施工紀要 Summary of the Arrival Construction of the TIAA MRT Extension Line A22-A21 Southbound Shield-tunneling Machine
A22車站至A21車站下行線潛盾機發進前留影。

本路段工程潛盾隧道所通過之地層土質主要為砂岩(大南灣層)及卵礫石(中壢層),針對本潛盾工程所在地之地質條件及施工環境等進行充分檢討,採用兩部泥土加壓平衡式潛盾機,潛盾機外徑φ6,240㎜、機身全長13.29m、環片外徑φ6,100㎜、環片內徑φ5,600㎜。
老街溪站(A22)至環北站(A21)間南下線隧道鑽掘共792公尺,此段隧道於105年5月20日開始發進端破鏡及初期掘進作業,並於105年7月23日完成設備轉換進入正式掘進作業,最終於105年12月22日鑽掘到達A21車站,平均每日鑽掘速率為4.8公尺。
A22車站至A21車站間下行線隧道鑽掘至175公尺~325公尺路段,遭遇泥質砂岩層地質,致使鑽掘速率大幅下降為平均每日約2公尺,後經不斷嘗試及調整掘進方式,逐漸改善並通過該施工困難地層,且道路沿線各項監測數據均正常,後續將提高機具設備維護頻率,並建立泥質砂岩層之鑽掘管理機制,以維護施工品質與進度。

The shield-tunnel engineering of this section is mainly made of geological substances of sandstone formation (Danawan section) and cobblestone formation (Zhongli section). Considering the geological conditions and the construction environment for the location, two shielded-type shield-tunneling models were utilized. As for the measurements of the components, the outer diameter of the shield-tunneling machine is φ6,240㎜, the length of the shield-tunneling machine is 13.29 m, the outer diameter of the segment is φ6,100㎜ and inner diameter of the segment is φ5,600㎜.
The current construction progress has completed a total of 792 meters of southbound tunneling from Laojie River Station (A22) to Huanbei Station (A21). The shield-tunneling construction of this section was launched on May 20, 2016 and has completed equipment transfer on Jul. 23, 2016, entering the formal tunneling phase. At last, the tunneling operations reached A21 Station on Dec. 22, 2016; the average shield-tunneling rate was 4.8 meters per day.
Due to a stratum of muddy sandstone at the southbound 175 to 325-meter section between A22 Station to A21 Station, the tunneling rate dropped significantly to an average of about 2 meters per day. Following, the team would continue to try and adjust the way of tunneling and gradually improved and tunnel through the difficult strata. In addition, the monitoring data along the road were all normal. Subsequently, the construction team will improve the maintenance frequency of machinery and equipment and the establishment of muddy sandstone tunneling management mechanism to maintain the construction quality and progress.

  • A22車站至A21車站隧道內施工中步道、軌道運輸系統。
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