Application of Double-slab Collaborative Strengthening Technology in Temporary Roadways on Roof Slabs

In response to the problem that existing basement roof slabs cannot meet the passage requirements of heavy construction vehicles, and considering that traditional shoring support methods hinder cross trade operations and delay the construction schedule, there is an urgent need for a new reinforcement approach that ensures both overload safety and construction efficiency. This paper proposed a novel "double-layer slab collaborative reinforcement" technique to address the risks of overloading on basement roof slabs while maintaining construction efficiency. Taking a specific project as the background, a combination of theoretical analysis and finite element simulation was adopted. Based on the principle of equivalent mid-span bending moment and wheel pressure diffusion theory, the wheel load of a 75 t transporter vehicle was converted into an equivalent uniformly distributed live load of 30 kN/m². Separate and composite double-layer slab mechanical models were established to analyze the bearing capacity and deformation characteristics of typical slab spans, and the optimal solution was selected through comparison. Theoretical analysis showed that in the separate scheme, the original slab bore 82% of the load while the newly added slab bore 18%; the stiffness of the composite scheme was 3.42 times that of the separate scheme. Finite element simulation results verified that the "double-layer slab collaborative reinforcement" technique can effectively replace traditional shoring support, ensuring the collaborative optimization of heavy-load passage and construction efficiency. The separate scheme, with its construction convenience and reliability, provides a promotable reinforcement solution for similar projects, advancing the development of temporary construction road design towards higher efficiency and lighter weight.