Page 26 - 捷運技術 第56期

Journal of Rapid Transit System and Technology No.56
pp. 15-36, 2021 DOI 10.29670/JRTST.202110_(56).0002

Received June 01, 2021, accepted September 01, 2021, date of publication October 31, 2021

Construction considerations of shallow excavation

and covering support with large-scale temporary

drainage steel aqueducts - Taking the

Eastern Extension Section of the Xinyi Line of the
MRT as an example

ZHIYANG CAI , CHINGYIN CHEN
2
1
1 Second District Project Office, Department of Rapid Transit Systems, Taipei City Government,
Taipei 105037, Taiwan
2 BES Engineering Corporation, Taipei 110039, Taiwan
Corresponding authors: ZHIYANG CAI, E-mail: 17331@dorts.gov.tw

ABSTRACT

The site of the eastern extension section of the Taipei MRT Xinyi Line is located on
the east side of the center of the Taipei Basin. The main construction works of the
project include the stations, crossing lines and ventilation shafts constructed by the
open cut and cover construction method, as well as the submersible shield drilling
and construction and the shield tunnels and other structures. The station and
crossing line constructed by the cut-and-cover method are located beneath Fude
Street (between Linkou Street and Dadao Road). The excavation area of the station
body and crossing line has an existing diameter of 1.2 and 2 meters. A large
drainage pipe culvert accommodates part of the Hushan watershed and rain
drainage on the south side of Fude Street. Because the width of Fude Street Street
within the area covered by the cut-and-cover should be only 25 meters and the
excavation area of the station body is already adjacent to the arcade buildings on
both sides., it is impossible to set up a new temporary rain drain of the same
specification outside the open-cut covered work area. Therefore, a steel aqueduct is
utilized in the design to be hung under the covering system as a temporary drainage
facility during construction. This article mainly introduces the large-scale
temporary drainage steel aqueduct in the open-cut covered work area. Design
considerations and construction planning for the subsequent design and
construction of similar projects are also presented.

Keywords: Steel Aqueduct, Drainage, Cut and Cover, Suspension