To solve the problems encountered during the assembly
of prefabricated secondary lining of mined metro tunnel in terms of limited
space, inconvenient transportation, difficult positioning, tunnel structure,
joint between precast and castinsitu
structure, transportation in a shaft, and construction technology, two suits of
equipment, a grippertype and a manipulatortype assembling machine and their technical demands, are
investigated using numerical analysis and shieldengineering
analogy method. The construction technology of the assembling machine and
structural conditions for the prefabricated lining ring are presented. The
mechanical assembly of the lining ring in a primary support inner contour is
realized. The main conclusions are as follows: (1) The grippertype assembling machine can continuously keep the lining ring in a
compaction state. The gripper should act on the primary support structure;
thus, the bearing capacity of the primary support should not be less than 150
kPa. (2) The longitudinal compaction state of the lining ring can be achieved
by the manipulatortype assembling machine with the
help of lining ring bolts. The waterproof of 300mm thick lining rings can be realized when
the axial force of bolt reaches 25 kN.
(3) The independent hoisting shaft for the assembling machine should be
used, and the clearance size generally can be 4.6 m × 6.7 m. (4) For the nonstandard crosssection of the
underground metro section, the castinsitu method should be employed first; then the assembled structure
should be wellconnected to the castinsitu structure, thereby ensuring smooth
passage of the assembling machine. (5) The accurate positioning of the assembled
ring can be realized using a positioning guide in advance.
ZHANG Jinwei
,
LUO Furong
,
YANG Binbin
,
WANG Ning
,
XU Qian
. Study on Conditions for Prefabricated Secondary Lining
Support Assembly of Metro Tunnel Constructed by Mining Method[J]. Tunnel Construction, 2021
, 41(3)
: 364
-371
.
DOI: 10.3973/j.issn.2096-4498.2021.03.004
