Immersed Tunnel Closure Joint Alignment Using Coordinate Feedback
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Solution Overview
Problem
The construction of immersed tunnels faces challenges due to axis deviations between tube couplings, which affect the connection quality of closure joints, leading to potential installation inaccuracies.
Innovation Solution
An installation method for closure joints in immersed tunnels involves establishing a coordinate system at the tail end of a tube coupling, distributing feature points, and calculating deviations using these points to adjust the positioning of tube couplings and push-out segments, ensuring precise alignment and connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If tube couplings are constructed independently from both ends to shorten construction period, then construction efficiency is improved, but axis deviation between tube couplings occurs affecting connection quality
Solution Approach 1:
The patent applies preliminary action by establishing a coordinate system and calculating deviation values before the actual installation of tube couplings. The deviation between axes of tube couplings is computed in advance using coordinate geometry, allowing for pre-determination of adjustment requirements. This enables the construction team to prepare adjustment plans before installation, ensuring accurate alignment while maintaining parallel construction from both ends.
Solution Approach 2:
The patent implements feedback by calculating the deviation between axes of tube couplings and using this information to adjust the installation position. The deviation value is computed based on coordinate data of breakthrough points, and this feedback information is used to correct the positioning of tube couplings during installation. This closed-loop approach ensures that axis alignment accuracy is maintained while allowing independent construction from both ends.
2Productivity
If deviation between axes of tube couplings is not corrected, then installation speed is maintained, but connection quality of closure joint deteriorates
Solution Approach 1:
The patent replaces mechanical measurement and adjustment methods with a coordinate geometry-based calculation system. Instead of using physical measurement tools to detect and adjust axis deviations, the system uses coordinate data of breakthrough points to calculate deviation values mathematically. This substitution allows for more precise and efficient deviation determination, maintaining installation speed while improving connection quality through accurate computational geometry.
3Device complexity
If traditional installation method without coordinate system is used, then installation process is simple, but positioning accuracy of closure joint decreases
Solution Approach 1:
The patent applies universality by creating a coordinate system that serves multiple functions: it establishes the reference framework for positioning, enables calculation of deviation values, provides basis for adjustment decisions, and ensures consistent alignment throughout the installation process. This multi-functional coordinate system, combined with the breakthrough point measurement method, achieves high positioning accuracy without requiring overly complex installation procedures.
Solution Approach 2:
The patent introduces coordinate data of breakthrough points as an intermediary element between the physical tube couplings and the desired alignment. Instead of directly measuring and adjusting tube coupling positions, the system uses the coordinate data of breakthrough points as an intermediate representation to calculate deviations and determine adjustments. This intermediary approach simplifies the overall process by providing a mathematical bridge between measurement and adjustment operations.
Data Source
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AI summary
The present application relates to an installation method for a closure joint of an immersed tunnel, and belongs to the technical field of closure joints; the installation method comprises the steps: establishing a first coordinate system; distributing feature points; installing the N+2 tube coupling; installing an N+1 tube coupling and pushing out a push-out segment; wherein, the first coordinate system is established at a tail end of an N+3 tube coupling, breakthrough points N+1S and N+1W are distributed at a head end and a tail end of a N+1 tube coupling respectively, breakthrough points DS and DW are distributed at a push-out segment, and breakthrough points N+2S and N+2W are distributed at a head end and a tail end of a N+2 tube coupling respectively; and coordinates of the breakthrough points DS, DW, N+1S, N+1W, N+2S, N+2W in the first coordinate system are calculated respectively; the installation method can improve the installation accuracy of the closure joint and is easy to operate.