Tunnel Boring Machine Segmented Body Control for Sharp Curve Alignment
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Solution Overview
Problem
Existing tunnel excavation devices face difficulties in maintaining alignment with the tunnel inner wall, especially when encountering sharp curves, as they primarily adjust the front body section while struggling to move the rear body section effectively along the inner wall.
Innovation Solution
A control method and device configuration that includes a front body section with cutters and a rear body section with grippers, connected by thrust cylinders, allowing for coordinated movement by setting prediction lines for both sections to secure and move along the tunnel wall, even in sharp curves, through controlled extension and retraction of the thrust cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If only the front body section position is adjusted, then the excavation direction can be corrected, but the rear body section cannot move along the inner wall when there is a sharp curve
Solution Approach 1:
The control method divides the body into front and rear sections, allowing independent position adjustment of each section. The front body section position is adjusted based on a first path line, while the rear body section position is adjusted based on a second path line, enabling each section to adapt to curve conditions independently and follow sharp curves effectively.
Solution Approach 2:
The system dynamically adjusts the position of both front and rear body sections based on real-time curve conditions. By calculating separate movement prediction lines for each section and continuously updating their positions, the excavator can adapt to varying curve sharpness and maintain contact with the inner wall throughout the tunnel.
2Stability of the object's composition
If the front body section is secured to the inner wall, then excavation stability is improved, but the rear body section cannot be positioned accurately on sharp curves
Solution Approach 1:
The control method independently manages the positioning of front and rear body sections. The front body section is secured to the inner wall for stability during excavation, while the rear body section position is separately adjusted based on a second path line to achieve accurate positioning on sharp curves, allowing both stability and precision to coexist.
Solution Approach 2:
The control system acts as an intermediary that coordinates between the stability requirement of the front body section and the positioning accuracy requirement of the rear body section. By calculating separate movement prediction lines and controlling each section independently, the system mediates between these conflicting requirements.
3Ease of operation
If traditional control methods are used, then the system is simple to operate, but it cannot maintain alignment with the tunnel inner wall on sharp curves
Solution Approach 1:
The control method dynamically calculates movement prediction lines for both front and rear body sections based on real-time position data and curve conditions. This dynamic adjustment maintains alignment with the tunnel inner wall on sharp curves while preserving ease of operation through automated control algorithms that handle the complexity.
Solution Approach 2:
The system uses feedback from position detection to continuously adjust the movement prediction lines for both body sections. By monitoring the actual positions and comparing them with the planned paths, the control system maintains alignment accuracy on sharp curves while keeping the operation process streamlined through automated feedback loops.
Data Source
AI summary
A control method for a tunnel excavation device is provided. While grippers of a rear body section protrude outward and the rear body section is secured to an inner wall of a tunnel, a plurality of thrust cylinders are controlled so that a front body section is made to move forward along a movement prediction line set based on a tunnel excavation plan line. While grippers of the front body section protrude outward and the front body section is secured to the inner wall of the tunnel, the plurality of thrust cylinders are controlled so that the rear body section is made to move forward along a movement prediction line set based on an actual result line.