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220 林清森 樊偉祺 捷運內湖線 CB420 區段標連續壁非破壞性檢測案例檢討

捷運內湖線 CB420 區段標連續壁非破壞性檢測案例檢討

1
林清森 樊偉祺 2

摘 要

連續壁作為地下擋土水壁已有50年以上施工歷史，基本概念為利用器械於欲執行擋土水
處挖掘適當深度之深槽，挖掘中以穩定液換置土塊，穩定液膜於槽壁上形成，作用類似模
板，穩定液之靜壓則作為槽壁穩定之支撐，依使用器械設備及擋土水壁之需求外形及槽壁垂

直面接合型態予以適當劃分長度，定名為單元(Panel of Element)，施工時依單元尺寸製作準
確之鋼筋籠吊放入槽溝，再以特密管澆置混凝土，目前連續壁工法已成為當前深開挖工程擋
土結構之主流，然而如何確認在地質條件不佳之環境下，完成之連續壁是否完整，其之檢測

作業在工程實務上尚不普遍，故本文僅就CB420標明挖覆蓋隧道及出土段連續壁施工後，所
進行之非破壞性檢測案例說明，以供參考。

關鍵詞：明挖覆蓋隧道、出土段、連續壁、導牆

Non-Destructive Test Case Study of Diaphragm Walls on Neihu MRT Line
Section Contract CB420

1
Ching-Sen Lin Wei-Chi Fan 2
Abstract

The construction of diaphragm walls to be applied as groundwater barriers and retaining walls
has been in use for more than 50 years. Basically it requires an appropriate trench being kept in
engineered fluid to form a slurry. The slurry exerts hydraulic pressure against the trench walls and
acts as shoring to prevent collapse, and stop-end pipes are placed vertically at each end of the panel

to form joints. During installation, a fitted steel reinforcement cage produced with an appropriate
panel size will be craned into the trench, and then concrete is poured in through a tremie pipe.
Currently, diaphragm wall construction is mainly used as a retaining wall system for deep
excavation. Nevertheless, evaluations of the completed diaphragm wall to see whether or not it

functions well under unfavorable geologic conditions are not commonly implemented. In this
article, a case study of non-destructive testing of diaphragm walls, which were installed at Section
Contract CB420’s cut-and-cover tunnel and day-lighting section, is discussed for reference.

Keywords: cut-and-cover tunnels, day-lighting section, diaphragm wall, guide wall

1 臺北市政府捷運工程局東區工程處土三所幫工程司 samlin@trts.dorts.gov.tw
2 臺北市政府捷運工程局東區工程處土三所幫工程司 fan@trts.dorts.gov.tw