Three-Main-Truss Arch Bridge Closure With Synchronous Spatial Alignment

The patent applies preliminary action by pre-adjusting the spatial positions of standard rods at closure openings before actual closure. The method involves pre-positioning standard rods using adjustment devices, pre-measuring spatial coordinates with total stations, and pre-calculating closure gaps based on temperature monitoring data. This preliminary preparation ensures high closure accuracy when the actual closure occurs, resolving the contradiction between accuracy and complexity by doing the complex work in advance.

The patent implements feedback through continuous monitoring of closure opening gaps using total stations and adjusting the positions of standard rods based on measured deviations from target values. The method also incorporates temperature monitoring feedback to predict thermal expansion/contraction effects and adjust closure timing and gap sizes accordingly. This closed-loop feedback system achieves high precision closure despite the complexity of adjusting rigid steel truss components.

The patent applies segmentation by dividing the closure system into three independent main trusses, each with its own standard rods and adjustment devices. This allows each truss to be adjusted and closed independently, making the heavy steel structure manageable and adjustable. The segmentation of closure operations into multiple points (multi-point closure) rather than a single monolithic closure enables precise control of each segment while maintaining overall structural strength.

The patent introduces standard rods as intermediary components between the main truss structures at closure openings. These standard rods serve as mediators that can be precisely positioned and adjusted using adjustment devices, pulling jacks, and jacking jacks before final closure. The intermediaries enable precise spatial alignment of the heavy main trusses without requiring direct manipulation of the main truss members themselves, resolving the contradiction between strength and adjustability.

The patent merges multiple closure operations into a synchronous multi-point closure process. Instead of closing each truss separately or relying solely on temperature-induced gap changes, the method combines precise measurement of all closure openings, coordinated adjustment of multiple standard rods, and simultaneous closure of multiple trusses. This merging of measurement, adjustment, and closure operations achieves high spatial precision while improving efficiency by completing multiple closures in coordination rather than sequentially.

The patent applies parameter changes by actively controlling and adjusting multiple parameters including spatial coordinates of standard rods, closure gap sizes, temperature monitoring data, and timing of closure operations. Rather than relying on passive temperature changes alone, the method actively modifies these parameters through adjustment devices and coordinated planning to achieve precise synchronous closure. This multi-parameter control approach resolves the contradiction between precision and efficiency by optimizing all relevant parameters simultaneously.