Innovation and Practice of Prefabricated Construction Technology for U-Shaped Grooves in Large Cross-Section Roadbeds
Prefabricated construction,with its environmentally friendly and highly efficient characteristics,is progressively being implemented across various underground engineering projects.As a connecting segment between the above ground and underground structures,the roadbed U-shaped groove presents significant challenges due to its steep cross-sectional slope and non-standardized configurations,thereby complicating the adoption of prefabrication techniques.To tackle these construction difficulties and propel a novel prefabrication approach for U-shaped grooves,research has been concentrated on China's first railway project utilizing prefabricated U-shaped grooves-the large cross-section U-shaped grooves assembly project of the Beijing-Tangshan Intercity Railway.This study encompasses the development of key technologies for the prefabricated construction of large cross-section roadbed U-shaped grooves.The investigation proposes combined permanent and temporary excavation methodologies and lightweight design strategies for U-shaped grooves structures,ensuring overall integrity and safety.In response to the inconsistencies in cross-sectional shapes and the complexities associated with assembling steep slopes,specialized prefabrication and assembly equipment have been developed,including adjustable universal molds,flipping gantries,and tensioning carts.Additionally,a systematic construction method for prefabricated U-shaped grooves and an intelligent quality control method throughout the entire process have been formulated,alongside the innovation of a new construction management model.This research pioneers a fresh paradigm for prefabricated U-shaped grooves construction,facilitating the broader application of industrialized building practices within the context of roadbed U-shaped grooves.
railway roadbedprefabricated constructionon-site testinglarge cross-section U-shaped grooveintegration of permanent and temporary structuresassembly equipment
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