Page 204 - 捷運技術 第45期

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劉嘉哲 宋建宏 詹宏義 陳世任 劉政雄
196 環狀線DF112標於狹窄道路處之高架橋及車站設計規劃

Planning and Design of Double-deck Viaducts and Elevated
Stations--Taking Taipei MRT Circular Line Detailed Design Lot

DF112 as an Example

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Jia-Jhe Liou Chien-Hung Sung Hung-I Chan Shih-Jen Chen 4
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Abstract
With the in-service Taipei MRT routes forming a radial network, it is necessary to
construct circular routes to connect the existing routes to establish a comprehensive
network. Detailed Design Lot DF112 is a critical part of the elevated section of the Taipei

MRT Circular line Phase I.
The route of this project passes through some narrow road segments, such as 24-m-wide
Jingping Road and Zhongshan Road, and 20-m-wide Bannan Road. In addition, on the roads

traffic is heavy while underneath pipelines are spread everywhere. Normal station width is
about 20-22 meters. Stations either with side platforms or island platforms will almost cover
the road. As a result, there would be not enough space for firefighting access, and would
cause serious negative impacts on the urban landscape and quality of life for residents in
the adjacent buildings on both sides of the stations by violating their sunshine rights and

privacy. Therefore, the plan for this project is to build three elevated stations on Zhongshan
Road and Bannan Road with double-deck platforms, and to build a double-deck viaduct to
connect stations, totaling 2.61 kilometers long.

Superposed line segments have already been constructed in shield tunnels and
underground stations along the Taipei MRT Zhonghe line, and double-deck viaducts for the
Shuiyuan Expressway in Gongguan and Huandong Expressway in Nangang. However, this
will be the first time in Taiwan that the technique is applied to elevated MRT construction.
As the section must also cross a viaduct that is part of the Bali-Xindian Expressway at the

intersection of Bannan and Zhongzheng roads, this project presents an enormous challenge.
This article not only describes the design of double-deck elevated stations, but also
depicts how the MRT route corresponds to a viaduct structure by transforming up-tracks and

down-tracks on the same level into tracks stacked on top of each other. The construction of
the climbing and descending sections shows particular concern for the differences in height
of viaduct pylons and involves a design of great complexity. It is hoped that the article can
serve as a valuable reference for more systematized and modulized planning and design for
future superposed viaducts.

Keywords: double-deck viaduct, narrow section, double-deck elevated station