Crack Control Technology of SPMT Transportation Structure of Long-span and Special-shaped Concrete Box Girder

By analyzing the engineering characteristics of SPMT transportation of long-span and special-shaped box girder, this paper took asynchronous displacement as the master control parameter of large concrete box girder transportation and stress as the auxiliary control parameter, and put forward the crack control method of spatial four-pivots driven concrete box girder transportation structure. Through numerical simulation, this paper set up the control values of girder posture and stress in box girder transportation, constructed the information monitoring system of girder posture and stress to realize remote real-time monitoring and real-time display, and shaped the stress and posture control technology of SPMT transportation structure for long-span specialshaped box girder, which helped the box girder of Cross Bay Link, Tseung Kwan O project to be successfully barged. The research results of this paper can be used for reference for similar projects in the future.