To achieve curved jacking with a small clear span and
long distance in a complex geology, pipejacking techniques, including
speciallydesigned cutterhead and main machine, bipolar
deviation adjusting and intelligent control system, as well as automatic
guiding system, drag reduction using pasteslurry
technology and sectional grouting, efficient slurry system, and strict slurry
operation management are applied. Following results are obtained: (1) The
slurry balance pipejacking machine can meet the
requirements of longdistance and curved pipejacking construction, and the intelligent control system is
convenient for equipment operation and project management. (2) The pipejacking friction is effectively reduced by combining highpressure paste slurry and the conventional sectional grouting of
thixotropic slurry, and the actual jacking force is approximately 60% of the
theoretical jacking force. (3) The automatic guiding system can achieve
deviation adjustment with a small angle and range, thus ensuring successful
pipe jacking. (4) The efficient slurry system and strict slurry operation
management effectively overcome difficulties caused by a complex geology and
small clear distance doublepipe jacking.
SUN Qing
,
FENG Wenqiang
,
WANG Zhiyun
,
ZHU Xiaodong
,
LI Yongfeng
,
YANG Shenghu
. Key Construction Techniques for Pipe Jacking in
Branches of Sewage Tunnels in Dadong Lake Core Area[J]. Tunnel Construction, 2021
, 41(7)
: 1218
-1224
.
DOI: 10.3973/j.issn.2096-4498.2021.07.016
