In order to improve the manufacturing level and
feasibility of homemade pipe jacking machine to
composite strata, the key technologies of hard rock slurry balance pipe jacking
machine for composite ground are studied by taking the sewage project at
Yongning District, Nanning for example. The research content includes: (1) A
compact cutterhead structure suitable for the composite ground is studied, and
the combination form of cutters is optimized. (2) Based on the commonlyused rock breaking method, a kind of variable position shear
secondary crushing mechanism is designed. (3) By means of eccentric overbreak
of cutterhead, setting stone powder diversion channel and injecting clay into
the outer side of the shield, the problem of easy jamming of shield and pipe in
hard rock stratum is solved. (4) The double structure of "slurry chamber +
air cushion chamber" is designed; and through the rapid and accurate
measurement of mud water pressure and the modular automatic control of valves,
the low disturbance driving is realized. (5) The targeted design of cutter
replacement under pressured condition and atmospheric condition is carried out
to realize safe cutter replacement in a narrow space. (6) The antiblocking measures for mud water circulation system are proposed by
combining with the transformation of various modes of mud water circulation
system and the rational arrangement of self flushing and high pressure water
flushing positions. The developed hard rock slurry balance pipe jacking machine
for composite ground has a good performance and strong geological adaptability
in the practice.
GONG Tingmin
,
JIA Lianhui
,
CHEN Wentao
,
ZHENG Yongguang
. Key Technologies of Hard Rock Slurry Balance Pipe
Jacking Machine for Composite Ground[J]. Tunnel Construction, 2020
, 40(6)
: 880
-889
.
DOI: 10.3973/j.issn.2096-4498.2020.06.014
