The application level of steel support axial force
servo system are needed to improve and
their ability to control deformation should be given full play. The elevated
structure Heping Station foundation pit of Shenzhen Urban Rail Transit Line 12
undergoes the intercity railway. Based on this project
and with the method of numerical simulation and theoretical analysis, the paper
conducts a systematic study on three aspects of servo system, namely, the
determination method of the axial force setting value, arrangement and node
calculation. Thus a complete set of servo system application method is formed.
The results show that: (1)The reasonable axial force setting value of each
steel support can be determined by using the doublecontrol
method to guide numerical simulation calculation. (2)The effect of servo system
depends on its quantity and position. Under a certain number of conditions, the
lower the average elevation of the servo system is, the better the deformation
control effect is, while the control efficiency of the shallow servo system is
poor. (3)For servo straighteners with diameter of 800 mm and wall thickness of
20 mm, ordinary bolts of level 4.6 or level 4.8 can meet the stress
requirements. For steel enclosing purlin at both ends, it is suggested to add
two stiffeners behind the contact range between steel and support pipe joint to
improve deformation and stress state. The hoop structure can effectively
restrain the lateral buckling deformation of the pipe joint system, and it can
give full play to its deformation control ability at the equinox.
WANG Zhijie
,
LI Zhen
,
CAI Libin
,
LI Hengyi
,
XU Haiyan
.
Research on Application Technology of Steel Support
Servo System
for Foundation Pit
[J]. Tunnel Construction, 2020
, 40(S2)
: 10
-22
.
DOI: 10.3973/j.issn.2096-4498.2020.S2.002
