To improve the construction efficiency of the earth
pressure balance (EPB)/single shield TBM doublemode
shield machine in mode conversion and minimize the construction risk, a case
study is conducted on the construction of the doublemode
shield used in Liuxiandong stationBaimang station of
Shenzhen metro line 13. According to the geological supplementary survey,
ground survey, and chamber inspection, the conversion position of TBM mode to
EPB mode is determined, and the three construction stages of the mode conversion
are explained in detail. A set of mode conversion technology for doublemode shield tunneling in rock formations with obvious soft and hard
boundaries is summarized. A series of works, including strengthening the
supplementary grouting in the tunnel, complete preparation of tools and
materials required for mode conversion, reasonable construction deployment, and
optimizing belt conveyor assembly and disassembly process and screw conveyor
tooling, have been employed before mode conversion, realizing a safe and highefficient mode conversion of doublemode
shield with 3 and 2 days ahead of records of single modeconversion time and minimum conversion time in China respectively.
YU Changying, ZHONG Zhiquan
.
Discussion on Construction Technology for Mode
Conversion between Earth Pressure
Balance and SingleShield TBM of DoubleMode Shield
[J]. Tunnel Construction, 2021
, 41(S1)
: 464
.
DOI: 10.3973/j.issn.2096-4498.2021.S1.061
