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題 名 | 捷運跨河隧道及道岔工程施工--以臺北捷運CK570C標工程為例=Construction of River-Crossing Tunnels and Turnout Work for Taipei MRT--Taking Contract CK570C of the Xinzhuang Line as an Example |
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作 者 | 孫吉甯; 常輝庭; | 書刊名 | 捷運技術 |
卷 期 | 44 2011.02[民100.02] |
頁 次 | 頁145-162 |
專 輯 | 新都會 新捷運 邁向黃金雙城--三環三線專輯 |
分類號 | 441.99 |
關鍵詞 | 道岔段; 圍堰; JSP樁; 連續壁; 封底灌漿; 大規模抽降水; 潛盾工法; 超高壓噴射灌漿; 冷凍工法; Turnout; Cofferdam; JSP piles; Diaphragm walls; Bottom sealing grouting; Largescale dewatering; Shield tunneling method; High pressure grouting; Freezing method; |
語 文 | 中文(Chinese) |
中文摘要 | 本文所敍述之跨河隧道及道岔工程(臺北捷運CK570C標),係三環三線路網第三 環中最關鍵之一段,係臺北捷運新莊、蘆洲線由臺北市進入新北市三重、新莊、蘆洲 地區之樞紐,必須在跨越臺北市、新北市交界之淡水河底進行明挖隧道道岔段之深開 挖,為提供行水區內施工機具運行之空間,故於河中施築圍堰,以利施工進行。道岔 結構為臺北捷運新莊線及蘆洲線之分岔,長約125公尺、深41.5公尺,寬由15公尺漸變 為26公尺,其中約40公尺長係位於堤防內之環河北路下方,為一地下五層結構,另長 約85公尺係位於堤防外行水區之河底,為一地下四層結構,工程開挖深達41.5公尺, 為克服高地下土、水壓力,以防開挖時產生上舉破壞,故採行許多特殊工法,如封底 灌漿、2公尺厚連續壁、大規模抽降水等工法。 潛盾隧道鏡面敲除作業之湧砂、湧水問題是一般潛盾工法施工經常遭遇之工程問 題,特別是在大深度且高地下水壓之隧道鏡面,受限於灌漿成效之不確定性,容易因 為鏡面敲除作業之湧砂、湧水問題而釀成嚴重工程災害。本標道岔結構共有6條潛盾 隧道均採上、下堆疊方式與其銜接,西側為新莊線發進及蘆洲線到達區,東側則為大 橋頭站潛盾到達區,計6處潛盾鏡面,加上大橋頭站西側之兩處潛盾發進鏡面,共計8 處潛盾鏡面,其隧道鏡面覆土深度分別約32.5m至23m間,鏡面處地下水壓高達23~32 t/m2,設計冷凍工法配合超高壓噴射灌漿工法以確保隧道鏡面敲除作業之止水成效。 本標工程難度甚高,在國內施工紀錄上均稱首例,其成功的經驗對國內工程技術之提 昇實有相當助益。 |
英文摘要 | This article describes the construction of river-crossing tunnels and the turnout section of the Xinzhuang line Section Contract CK570C, a crucial section of the Taipei MRT “Three Rings & Three Lines.” As the section is a crucial point where the Xinzhuang and Luzhou lines enter New Taipei City's Sanchong, Xinzhuang, and Luzhou districts, a deep excavation is needed at the cut-and-cover tunnel's turnout section beneath the Danshui River which separates Taipei City and New Taipei City. A cofferdam was built in the river to provide working space for open-cut excavation, construction machines and tools. The turnout, the branch line fork of the Xinzhuang line and Luzhou line, is 125m long, 41.5m deep and gradually changes from 15m to 26m in width, of which 40m of the length is located beneath Huanhe N. Rd. inside the levee bank while the other 85m runs in the area beyond the levee. The section is a four-level underground structure with a 41.5-m-deep excavation. Some special construction methods, such as bottom sealing grouting, a 2-m-thick diaphragm wall, and large-scale dewatering, were applied to this work to overcome underground earth pressure, water pressure and upwelling force. Sand upwelling and water upwelling were typical problems during the tunnel entrance frame excavation, especially in deep areas with high earth and water pressure. Due to the uncertainty of the grouting effect, these problems could cause serious damage to the entrance frame and result in construction failure. There were a total of eight tunnel entrance frames at depths ranging from 32.5m to 23m and water pressures from 23 to 32 t/m2. The freezing method with high pressure jet grouting was applied to assure the effect of the water seal during the tunnel entrance frame excavation. The high diffi culty and risky construction made Section Contract CK570C the fi rst of its type in the nation. The successful experience is truly benefi cial to the enhancement of technology in domestic construction. |
本系統中英文摘要資訊取自各篇刊載內容。