Page 30 - 捷運技術 第38期

24 張武訓 詹榮鋒 程道信 都會區潛盾隧道穿越既有結構物困難施工案例探討

都會區潛盾隧道穿越既有結構物困難施工案例探討

張武訓 詹榮鋒 程道信 3
1
2
摘要

臺北捷運新莊線於松江南京站與忠孝新生站之間，其潛盾隧道工程必須自營運中的臺鐵
與高鐵隧道結構下方通過，且需穿越既有地鐵結構下方之六道擋土壁體，包括不規則之連續
壁體及非連續性之基樁群等。本項工程由於基地外部環境條件諸多限制，捷運隧道線形與穿
越之壁體及基樁群又非正交，壁體無法維持一般完整性與連續性之需求，造成穿越過程中莫

大之困擾與風險。本施工案例採取之工法係由潛盾機盾首進行擋土壁體前後之水平灌漿地盤
改良，並配合出艙挖掘作業以玻璃纖維噴凝土工法及點井工法搭配使用，以確保擋土壁體敲
除作業之安全，敲除過程藉由僅約85*55公分之進出通道，進入潛盾機前方狹隘的工作區間
內，以人工敲除方式排除障礙。本文特就穿越前述地下既有結構物所採行對策與施工方法，

以及穿越過程所面臨困難、危險狀況之發生、因應與克服，做深入之案例探討。
關鍵詞：地下擋土壁、水平灌漿、玻璃纖維噴凝土、點井

A Discussion of Bored Tunneling Driving Through a

Retaining Wall Beneath an Existing Railway System
1 2
Wu-Hsun Chang Rong-Fong Jhan Dao-Hsin Cheng3

Abstract

Construction of the Xinzhuang line between Songjiang Nanjing Station and Zhongxiao
Xinsheng Station needed to pass beneath the operational Taiwan Railway System and Taiwan High
Speed Rail System, with the shield tunneling machine traversing beneath six existing retaining
structures including an irregular diaphragm wall and non-successive piling settings, etc. Limited by

unfavorable environmental factors outside the construction site, the shield tunnel construction was
a tough engineering challenge. The construction began with horizontal grouting to improve the soil
condition around the domain of the retaining wall from the top head of the tunnel boring machine
(TBM). Then the glass-fiber shotcrete method and the well-point method followed. Excavation and
demolishing of obstacles was performed by hand after workers passed through the diaphragm wall

structure through an approximately 85 x 55 cm channel to enter the narrow working space ahead of
the TBM.
This article is a case study of the MRT construction traversing existing structures through the
use of a tunnel boring machine. It provides an in-depth description of the construction, difficulties,
and discusses countermeasures for overcoming the many challenges.
Keywords: underground retaining wall, horizontal grouting, glass-fiber shotcrete, well-point.

1. 臺北市政府捷運工程局南區工程處處長 wschang@trts.dorts.gov.tw
2. 臺北市政府捷運工程局南區工程處副總工程司 jfchan@trts.dorts.gov.tw
3. 臺北市政府捷運工程局南區工程處工務所主任 dhcheng@trts.dorts.gov.tw