To improve the construction accuracy and quality of
largediameter metro jet system(MJS) vertical reinforcement under a low
clearance, a case study is conducted on the Airport T1~T2 Section on the
XintangBaiyun AirportGuangzhou
North Railway Station of Intercity Railway in Pearl River Delta, and
construction technologies are introduced. First, according to the project
overview and geological conditions, the undercrossing
scheme and the soil prereinforcement arrangement are
determined. Then, the construction challenges and essential construction
control technologies are studied specifically. Finally, the reinforcement
effect is comprehensively examined from three aspects: pileforming quality, structural displacement, and benefits evaluation.
The research results show the following: (1) By transforming the lifting device
system, the reinforcement construction can be realized under low clearance,
thus greatly improves the construction adaptability. (2) The speciallydesigned alloy drill head and the level can realize poreforming with high precision, and the highpressure
grouting system can realize the highquality pile with
large diameter. (3) The improved MJS process not only ensures the reinforcement
effect, but also effectively avoids underground obstacles and pipelines, and
its microdisturbance effect also ensures the normal
operation of the underground passage during construction.
LYU Minghao, WEI Chenglin, TANG Xinwei
. Application of LargeDiameter
Metro Jet System in Shield Crossing Underground
Passage with Low Clearance: A Case Study of Airport T1~T2 Section on XintangBaiyun AirportGuangzhou North Railway Station of Intercity
Railway in Pearl River Delta[J]. Tunnel Construction, 2023
, 43(S1)
: 434
-442
.
DOI: 10.3973/j.issn.2096-4498.2023.S1.050
