To investigate the mechanical characteristics and
sealing property of the rubber ring of a rectangular pipe jacking tunnel joint,
the critical state value of the joint in case of waterproof failure is calculated
using the joint detail dimension relation expression. Then, the joint′s
installation model is established using finite element software, and the joint′s installation clearance and pipe section′s
deflection angle are quantitatively changed. Finally, the simulation and
theoretical calculation results are compared. The comparative results show the
following. (1) The mounting force of the rubber ring increases to the peak
value first and then decreases to a constant value with an increase in the mounting
distance, and the mounting gap′s size significantly
affects the mounting force. (2) When the compression height of the rubber ring
ranges from 8 to 14 mm, the rubber ring has a good waterproof performance,
whereas the rubber ring does not meet the requirements of the specification
when the height is <8 or >14 mm due to contact pressure <0.3 MPa and
excessive compression. (3) The maximum allowable deflection angle is 0.02 rad
when the pipe joint is deflected. When the deflection angle further increases, the
leakage damage due to insufficient contact pressure, contact damage between the
steel sleeve ring and socket pipe joint, separation damage between the steel
sleeve ring and rubber ring, and damage due to excessive compression of the
rubber ring occurs successively.
XU Youjun
,
PEI Xuejun
,
DONG Wenxiu
,
HUANG Zhengdong
,
KANG Jiawang
. Waterproof Safety Limit of Rubber Rings of Rectangular
Pipe Jacking Tunnel Joints[J]. Tunnel Construction, 2022
, 42(3)
: 388
-397
.
DOI: 10.3973/j.issn.2096-4498.2022.03.006
