When constructing a foundation pit with large spaces,
existing buildings in the foundation pit should be protected. Based on a
comparison between the central island and cut and cover top-down methods, a steel-strand tensioning method is proposed. The steel-strand tensioning method can be used in a case where the protected
building (structure) has no basement or the basement is shallow, and the
retaining structure should be a regular quadrilateral or hexagon; however, for
deep basements, the steel-strand hooping method can be
used, and the retaining structure should be round. Vertical support spacing can
be reasonably adjusted according to the depth of the foundation pit and the
deformation requirements of the protected building. When using the steelstrand tensioning method, the sleeve is used when drilling holes in
the ground to reduce the settlement of the upper building. On the contrary,
when the steelstrand hooping method is employed, 2~4
tension ends are provided, and channel steel is installed on the side of the
retaining structure. The steelstrand tensioning method
has many advantages, including convenient construction, low cost, and no
influence on the underground space construction, which can be easily dismantled.
NIU Bin
.
Protection Design of Existing Buildings in Middle of
a Foundation Pit with Large Spaces
[J]. Tunnel Construction, 2021
, 41(10)
: 1765
-1770
.
DOI: 10.3973/j.issn.2096-4498.2021.10.016
