For a metro station constructed with the cutandcover topdown method, if the
perpendicularity of the concretefilled steel tubular
columns does not meet the requirements of relevant specifications, the
perpendicularity deviation must be corrected. The perpendicularity deviations
of the concretefilled steel tubular columns of the
first underground floor to the third underground floor toward the horizontal crosssection
direction of the station reach 114, 254, and 375 mm, respectively, those toward
longitudinal direction reach 44, 68, and 93 mm, respectively, which is beyond
relevant requirements, showing that concretefilled
steel tubular columns should be replaced. The main measures adopted are as
follows: (1) temporary support is provided for the replacement structure by the
joint support of concrete and steel tubular columns; (2) when removing the
concretefilled steel tubular columns, a combination of
static and manual removal is used to retain the original beams and steel bars
in the plate; (3) the newlyadded steel pipe top
reinforcement ring and the original reinforcement ring of column top of the
first underground floor are tightened, bolted, and welded to ensure the
reliability of the connection; and (4) the automatic deformation and strain
monitoring should be conducted during the whole construction process. The
practice shows that the replacement scheme is reasonable and feasible.
NIU Bin
.
Replacement Technology of ConcreteFilled
Steel Tubular Columns in Method
Station Excavated by CutandCover
TopDown Method
[J]. Tunnel Construction, 2021
, 41(6)
: 1032
-1038
.
DOI: 10.3973/j.issn.2096-4498.2021.06.016
