The negative ring assembly is one of the key
construction processes in shield launching. In order to solve the construction
problems such as negative ring assembly difficulty during shield launching,
irregular assembly process and large deviation of assembly size, theoretical
study, threedimensional simulation, numerical calculations, etc. are used to
study the construction process and roundness fitting inspection methods of fine
assembly of superlarge diameter shield negative ring
by taking Nanjing Heyan Road Rivercrossing Project for
example. The assembly positioning method and related construction measurement
content of negative ring are emphatically studied; the control points in the
construction process are described; the selection method of locating feature
points, the control method when tubes are rolled out, the method to reduce the
influence of tube sinking, the control standards for tube assembling, etc. are
summarized; and thus a calculation method of flatness of the superlarge diameter shield tubes is formed. The applicable results of the
study (to the negative ring assembly process of Heyan Road Rivercrossing Tunnel Project) show that: the construction process is
smooth, the accuracy of the negative ring assembly and the control of the
roundness are higher than the requirements of the design and specification, and
the dislocation and ellipticity are reduced to the maximum extent, which
greatly improves the forming quality of the tubes.
LI Anyun, SUN Yubin, HU Zengxu, ZHANG Lei
. Fine Assembling Technology of Negative Ring of Superlarge
Diameter Shield: a Case
Study on Nanjing Heyan Road Rivercrossing Tunnel
Project[J]. Tunnel Construction, 2020
, 40(S1)
: 350
-357
.
DOI: 10.3973/j.issn.2096-4498.2020.S1.045
