Page 130 - 捷運技術 第59期

Journal of Rapid Transit System and Technology No.59
pp. 119-150, 2024 DOI 10.29670/JRTST.202410_(59).0006

Received June 02, 2022, accepted July 25, 2022, date of publication October 31, 2024

Construction planning for the CQ850 section of the

MRT Wanda Line in response to the sharp turning
radius of the shield Tunnel

HSUCHOU YU 1
1 Second District Project Office ,Department of Rapid Transit Systems, Taipei City Government
Corresponding authors: HSUCHOU YU, E-mail: bw0099@gov.taipei

ABSTRACT

With the highly developed metropolitan and limited land using area, the ground
transportation is not enough. In order to reduce the impact of traffic and solve
available landing problems, the MRT route often adopts shield tunnel construction
methods between MRT stations during planning considerations to increase using
land in metropolitan areas.However, in the face of crowded urban underground
space, the construction of a sharp curve shield tunnel is getting more difficult.Two
key factors are considered in the construction of the R51m sharp curve, one is
reducing the amount of over-excavation effectively and the other one is reducing
the risk of ground subsidence to ensure that the shield tail clearance of the shield
machine can accurately install the ring sheet at the design position.In addition to
the extremely small curvature turning radius of R51m and R57m, the shield tunnel
project of this standard still needs to overcome the removal of the retaining piles of
the Shuanghe Bridge (pile diameter 1.2m, width 20m) located in front of the CP6
connecting passage, and a large number of site improvements. Also difficulty in the
underground retaining structure of the early stage Wayaogou pumping station
construction and the underground obstacles of the bridge foundation.While facing
various construction problems, how to choose suitable tunnel drilling construction
tools and auxiliary equipment is an important topic, especially the R51m sharp
curve construction is the main key consideration for the selection of shield
machines for this project. In addition to evaluating the design of shield machines
proposed by various manufacturers, this selection of shield machines focuses on the
overall design of the shield machines and related supporting measures, and
compares the differences between the Japanese shield machines and the European
ones.

Keywords: sharp-curve,shield TBM selection,shield tunnel