The tensioning of prestressed concrete lining is the key link in the construction of prestressed lining of shield water conveyance tunnel. The existing tensioning methods are complicated and the construction efficiency is low, so it is difficult to carry out reasonable resource allocation. Therefore, based on the prestressed lining interval of a water conveyance shield tunnel in the Pearl River Delta Water Resources Allocation Project, the prestressed concrete lining tension construction scheme is optimized by finite element numerical simulation and on-site construction efficiency comparison. The results show that the optimization scheme of one machine with two roofs and two anchorage slots on both sides of a single tension can not only meet the structural safety requirements, but also reduce the overall deformation by 28.04% compared with the design conditions. The improvement effect of structural deformation is the best, and the number of tensions during construction is 22 times less than that of the design conditions. The optimized tensioning scheme of each prestressed concrete pouring segment can save the tensioning construction time by 19.98 h, which significantly improves the construction efficiency under the premise of ensuring the safety of the structure. The research results can provide reference for similar projects.
Xie Qiang
,
Chen Yuchi
,
Wang Yandong
,
Chen Xuan
,
Liu Chang
. Study on the Optimization Scheme of Unbonded Prestressed Concrete Lining Tension[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(S2)
: 811
-818
.
DOI: 10.20174/j.JUSE.2024.S2.34
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