To improve the fire prevention and control level of
superlarge section steel shell immersed tunnels in China, a case study is
conducted on the ShenzhenZhongshan link immersed
tunnel and the fire resistance limit standard of the tunnel is studied using
thermalmechanical coupling simulation and material
property test. When conducting the fire resistance test of the pipe joint
structure and pipe joint, the weak links of the fire prevention structures,
such as keel and seam, are considered and the corresponding fire protection
technical scheme is introduced. The main conclusions are as follows: (1) The
maximum temperature of the inner steel shell of the structure should be
controlled within 300 ℃ in case of a fire. (2) The time
for OMEGA rubber under 70 ℃ and 100 ℃ shall not exceed 2 and 1 h, respectively, and the maximum
temperature shall not exceed 150 ℃. (3) The time for
GINA rubber under 100 ℃ shall not exceed 1 h, and the
maximum temperature shall not exceed 150 ℃. (4) The
pipe joint structure can use a 35mmthick singlelayer fireproof board and an Lshaped joint, and the joint surface is coated with a thermal
expansion adhesive. (5) The pipe joint can adopt a doublelayer fire protection system with a 35mmthick fireproof board and a 50mmthick ceramic fiber blanket. The free end of the keel is 500 mm, and
the joints are sealed using fireproof glue.
WU Mengjun
,
WU Qingliang
,
SONG Shenyou
,
CAO Peng
. Fire Resistance Limit Standard and Fire Protection
Technology of Steel Shell Immersed Tunnel: A Case Study of ShenzhenZhongshan Link Immersed Tunnel[J]. Tunnel Construction, 2024
, 44(2)
: 257
-265
.
DOI: 10.3973/j.issn.2096-4498.2024.02.004
