Structural force balance control is challenging
Lifting risk: If the beam is lifted unevenly, it may cause cracks or deformation, especially for large-span bridges.
Operational accuracy: Multiple jacks need to be synchronously controlled, and any slight deviation may affect structural safety.
The contradiction between the demolition of old supports and limited space is prominent
Corrosion adhesion: Old bearings often adhere to beams and piers, and forcibly removing them can easily damage the concrete.
Space constraint: Insufficient reserved space in early bridge design and narrow working surface.
Difficulty in controlling the compatibility of new and old supports
Model matching: The new bearings need to accurately match the bridge design load and displacement requirements.
Installation accuracy: Position deviation can lead to uneven stress and affect the stability of the bridge.
External interference factors
Weather effects: Changes in temperature and humidity may affect material properties.
Traffic control: It is necessary to coordinate construction and traffic, which increases the difficulty of organization.