In order to solve the
problem of long construction period of long shield-bored tunnels where the segment erection is started after the shield
boring is finished, the authors propose the "shield boring + segment
erection" synchronization technology based on the active control of the
thrust vector, and provide an optimization scheme based on the self-compensation calculation method for the missing thrust. Such
technology is used on a super-large diameter (14.07 m) slurry balanced shield, which is successfully applied in
the Airport Link Line of Shanghai Suburban Railway. The system response data of
the shield during the erection of segment ring No. 1 022 are analyzed and
conclusions drawn are as follows: (1) The execution accuracy of the pressure of
the propulsion cylinders is ±5%, with the phenomenon of
short-term response delay. (2) At the moment when the
cylinders retract, the total thrust drops sharply before it rises; at the
moment when the cylinders extend, the total thrust rises sharply before it drops;
the error of the total thrust is controlled within ±3%
of the set target value. (3) The shield boring speed is significantly affected
by the total thrust, and shares the same trend with the total thrust. (4) The
small changes of the thrust vector do not have significant impact on the shield
posture, since the shield is surrounded by the soil mass. The construction data
of 351 segment rings accomplished in one month by using the "shield boring
+ segment erection" synchronization technology is analyzed, and the result
shows that the adoption of the "shield boring + segment erection"
synchronization technology improves the tunneling efficiency by about 27%,
compared with the conventional "segment erection after shield boring"
technology.
ZHU Yeting
,
ZHU Yanfei
,
QIN Yuan
,
ZHAO Jian
,
WANG Zhihua
,
GONG Wei
. Case Study on "Shield
Boring+Segment Erection" Synchronization Technology in Tunneling by Super-Large Diameter Slurry
Balanced Shield[J]. Tunnel Construction, 2024
, 44(11)
: 2271
-2282
.
DOI: 10.3973/j.issn.2096-4498.2024.11.017
