When a hard rock pipe jacking machine bored in an
extra-long tunnel, phenomena of abnormal loss of thixotropic slurry,
accumulation of debris, backflow of debris, and main thrust force dispersion-caused insufficient jacking force occurred. A case study is
conducted on the #3 tunnel of Qianping water supply project in Ruyang, China,
and a mechanized trenchless equipment, a hard rock pipe jacking machine, is
designed and developed. Key technologies of coordinated linkage booster system,
slurry-sealing device, debris collection system, and
mud-water circulation system are analyzed. By analyzing
the test data, a real jacking force model is established. The results show that:
(1) Under a maximum load of no more than 16 000 kN, the rock-breaking capacity of the equipment meets the requirement of uniaxial
compressive strength Rc> 195.93
MPa. (2) The coordinated linkage device and the #2 and #3 relay chambers of the
equipment are activated in a 1 535 m-long tunnel,
reaching required jacking force for tunnel jacking construction.
WANG Mengmeng
,
FAN Lei
,
SUN Yingjie
,
CHEN Jiahao
. Key Technologies of Pipe Jacking Machines for Extra-Long Distance Hard Rocks and Their Application[J]. Tunnel Construction, 2025
, 45(S1)
: 351
-360
.
DOI: 10.3973/j.issn.2096-4498.2025.S1.034
