Conversion technology of steel reinforcement system for underground engineering lining

In the construction of linings for underground structures such as mines and traffic tunnels, reinforcement cages are typically assembled on concrete formwork trolleys. This practice occupies critical positions along the construction line and thereby reduces overall construction efficiency. To address this issue, the present study investigated the transformation technology of lining reinforcement cages, based on the underground project in the Xiong’an New Area of the Xiong’an-Xinzhou high-speed railway. Full-scale model tests and numerical simulations were conducted to evaluate the feasibility and effectiveness of several support schemes, which were subsequently implemented in practical engineering applications. The following conclusions were drawn: 1) A system support scheme utilizing a matrix-type lifting point system was proposed, and its feasibility was verified through implementation in actual engineering projects. 2) During the system transformation, the measured average deformation of the lining reinforcement cage was accurately maintained within 5 mm, with the maximum deformation not exceeding 10 mm. This ensured adherence to the design thickness of the structural protective layer and the installation quality of embedded components. Therefore, the proposed scheme offers a novel and effective solution for the construction of underground engineering lining.