Tunnel Formwork Rail Structure for Faster Sidewall Lining
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Solution Overview
Problem
The Belgian method for constructing tunnels is slow and costly due to the need for manual excavation and frequent formwork assembly/disassembly, particularly for lining side walls.
Innovation Solution
A movable formwork system with a guide rail and fastening means for attaching to a surface, allowing formwork panels to slide and anchor to previously set concrete, enabling automated lining of tunnel surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual excavation and batch formwork assembly/disassembly is used (Belgian method), then excavation stability is improved, but construction time and cost increase
Solution Approach 1:
The formwork system is designed to be movable along the tunnel axis on guide rails, transforming from static batch assembly to dynamic continuous operation. The formwork panel can be repositioned incrementally after each concreting cycle, enabling continuous lining progress while maintaining the stability benefits of the Belgian method through controlled incremental advancement.
Solution Approach 2:
The system eliminates idle time between formwork assembly and disassembly operations by implementing a continuous cycling process: the formwork moves to the next position, anchors are installed in the new location, and concreting begins immediately. This continuous operation maintains excavation stability while dramatically improving construction productivity.
2Manufacturing precision
If frequent formwork assembly and disassembly is performed, then lining precision is improved, but construction cost and time increase
Solution Approach 1:
The formwork system transitions from repeated static assembly/disassembly to dynamic repositioning along guide rails. The movable design allows the same formwork panel to be efficiently relocated and reused, maintaining lining precision through controlled movement while eliminating the time-consuming assembly and disassembly cycles.
Solution Approach 2:
Instead of discarding or storing formwork components after each use, the system recovers the formwork panel by moving it to the next lining position. The guide rail system enables efficient recovery and reuse of the formwork, maintaining precision while reducing the time and cost associated with repeated assembly operations.
3Productivity
If heavy machinery is used for formwork handling, then operation speed is improved, but site invasion increases
Solution Approach 1:
The formwork system is segmented into modular components (formwork panel, guide rails, anchoring structures) that can be independently positioned and assembled. This segmentation allows the system to operate with minimal equipment and reduced site footprint while maintaining operational efficiency through the coordinated function of discrete components.
Solution Approach 2:
The guide rail acts as an intermediary element that enables formwork movement without requiring heavy lifting machinery. The rail system provides a guided pathway that allows the formwork to be repositioned using minimal force, reducing the need for large equipment and minimizing site invasion.
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
Reduces construction time and cost by minimizing manual labor and heavy machinery use, while maintaining stability and reducing site invasion.
Implementation Method 1
rolling means sliding on a surface of the guide rail
Data Source
AI summary
A movable formwork system for lining part of a tunnel includes a guide rail, a fastening component for fastening the guide rail to a surface of the tunnel to be lined, a formwork panel coupled to the guide rail, a rolling component sliding on a surface of the guide rail and attached to the formwork panel, and an anchoring structure having one part attached to the formwork panel and another part projecting from the formwork panel and is configured to be fastened to a surface of the tunnel to be lined. The formwork panel along with the anchoring structure can move together guided by the guide rail when the anchoring structure is not fastened to a surface of the tunnel to be lined. The system is applicable for building mined soft-ground tunnels, for example, where the so-called Belgian tunneling method is recommended.