Bridge Pier Head Deflection Monitoring With Laser Plumb Alignment
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Solution Overview
Problem
Existing methods for monitoring pier head deflection and positional deviation of bridge superstructures during construction and dismantling are not sufficiently accurate, reliable, and cost-effective, particularly in the incremental launching method, leading to potential structural impairments and deviations from the predetermined position.
Innovation Solution
A method and device using a plumb laser fixed to a bridge pier base, projecting a vertical laser beam onto a laser plumb disc at the pier head, with a camera capturing control characteristics relative to the laser plumb line to monitor pier head deflection and positional deviation, allowing for continuous and remote access to data for corrective actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional monitoring methods (infrared sensors, laser plumb lines) are used to monitor pier head deflection, then alignment monitoring is possible, but measurement precision and reliability are insufficient
Solution Approach 1:
The patent replaces traditional mechanical monitoring systems (infrared sensors, manual laser plumb lines) with an automated optical monitoring system using plumb lasers and cameras. The plumb laser projects a vertical reference line, and the camera captures images to precisely measure pier head deflection and superstructure position, eliminating manual measurement errors and improving both precision and reliability.
Solution Approach 2:
The patent creates an optical copy of the vertical reference line using the plumb laser, which projects a laser plumb line that serves as a permanent reference. This optical copy allows for continuous, non-contact measurement of deflection by comparing the actual position against the laser reference line, significantly improving measurement accuracy.
2Reliability
If comprehensive monitoring of pier head deflection and positional deviation is implemented, then structural integrity is improved, but device complexity increases
Solution Approach 1:
The patent designs a multi-functional monitoring system where the plumb laser and camera setup serves multiple purposes: monitoring pier head deflection, tracking superstructure position, and providing vertical alignment reference. This single system replaces what would otherwise require multiple separate monitoring devices, reducing overall system complexity while maintaining comprehensive monitoring capability.
Solution Approach 2:
The patent introduces a camera as an intermediary device that captures images of the laser plumb line and control characteristics. This intermediary allows for indirect but precise measurement of deflection and position, simplifying the direct measurement process while maintaining high accuracy through image analysis.
3Manufacturing precision
If continuous monitoring during construction and dismantling is performed, then positional accuracy is maintained, but loss of time for setup and measurement occurs
Solution Approach 1:
The patent establishes the plumb laser and camera system before construction activities begin, creating a permanent reference framework. The laser plumb line is projected onto a reference surface in advance, and control characteristics are pre-marked on the superstructure. This preliminary setup enables continuous monitoring without repeated setup time during construction and dismantling operations.
Solution Approach 2:
The patent enables continuous monitoring throughout the entire construction and dismantling process. The plumb laser and camera system operates continuously, capturing images at regular intervals or during critical operations. This continuous action eliminates interruptions for manual measurements and maintains constant oversight of position accuracy without significant time loss.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise, reliable, and cost-effective monitoring of pier head deflection and positional deviation, facilitating timely adjustments to maintain structural integrity and alignment, reducing the risk of excessive deflection and deviation.
Implementation Method 1
arranging a plumb laser at the fixed point; perpendicularly projecting a projection point of the fixed point towards a pier head of the bridge pier using a laser beam of the plumb laser
Data Source
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AI summary
The invention relates to a method (100) for monitoring the pier head deflection (9) of a bridge pier (208) and/or the positional deviation (39) of a bridge superstructure (206), in particular in the construction and/or dismantling of bridges (202) using the incremental launching method and/or by means of a launching gantry.The invention further relates to a device (1) for monitoring the pier head deflection (9) of a bridge pier (208) and/or the positional deviation (39) of a bridge superstructure (206), comprising a plumb laser (7) configured to emit a vertical laser beam (11); a laser plumb disk (13) preferably having a measuring grid (33); a plumb disk fixing (15) configured to fix the laser plumb disk (13) horizontally projecting from a pier head (218) of the bridge pier (208) onto the pier head (218) and above the plumb laser (7), so that the laser beam (11) of the plumb laser (7) can be projected onto the laser plumb disk (13); and a camera unit (19) for capturing images and/or videos of the laser beam (11) striking the laser plumb disk (13).