In order to improve construction efficiency, it is
necessary to study the feasibility of directly cutting largediameter
pile foundation by shield and the performance of hob and cutter and to obtain
the key driving parameters of shield. A model experiment of directly cutting
largediameter pile foundation by shield is carried
out. The results show that: (1) Grinding method, "low propelling speed and
high rotational speed", should be adopted for shield to cut pile
foundation of largediameter, and the propelling speed
of cutter head is suggested to be 3~5 mm/min, the rotational speed to be
1.0~1.2 r/min. (2) The hob is more favorable to concrete, while the cutter is
more favorable to steel bars. (3) The higher the concrete strength, the better
cutting effect of hob on the steel bar. (4) The axial vibration of cutter head
is obvious when the hob cutting piles, but it is less obvious than that when
the cutter cutting pile foundations at low propulsion speed and rotation speed.
(5) The hoop vibrationg of cutter head is strong as cutting pile foundations,
and it is easy to be jamed under high propelling speed, while increasing
rotational speed can effectively reduce the stuck times of cutterhead.
WU Zhifeng
,
LIU Yongsheng
,
ZHANG Jie
,
YANG Zhuangzhi
. Experiment and Engineering Practice of Directly
Removing Largediameter Pile Foundations by Shield[J]. Tunnel Construction, 2020
, 40(S2)
: 280
-288
.
DOI: 10.3973/j.issn.2096-4498.2020.S2.036
