Self-supporting steel frame for tunnel lining
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Solution Overview
Problem
Conventional methods for renovating tubular structures like tunnels and underpasses are costly, complex, and often require complete route closure, failing to meet nature and landscape protection requirements and necessitating the use of formwork carriages for concrete reinforcement.
Innovation Solution
A frame structure comprising steel girder arches with adjustable reinforcement layers and removable formwork, allowing section-by-section expansion of the inner shell without formwork carriages, self-supporting and adaptable to existing structures, while maintaining safety distances and avoiding damage to sealing foils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional reinforcement frames with formwork carriages are used, then the inner lining can be constructed, but the device complexity and cost increase significantly, requiring complete route closure
Solution Approach 1:
The formwork system is segmented into individual formwork elements that can be separately positioned and fixed to the reinforcement frame, eliminating the need for a complex moving formwork carriage. Each formwork element can be independently handled and installed, simplifying the overall construction process and reducing equipment requirements.
Solution Approach 2:
A formwork support element acts as an intermediary component between the reinforcement frame and the formwork. This support element provides a simple fixation mechanism that eliminates the need for complex formwork carriage systems, thereby reducing device complexity while maintaining construction capability.
2Productivity
If section-by-section concreting is implemented, then productivity increases and route closure time is reduced, but the frame structure must be self-supporting without formwork carriages
Solution Approach 1:
The reinforcement frame is pre-assembled and made self-supporting before concreting begins. The frame includes pre-installed formwork support elements that are ready to receive and stabilize individual formwork elements, allowing section-by-section concreting to proceed without requiring a formwork carriage for structural support.
Solution Approach 2:
The reinforcement frame is designed to be self-supporting, carrying its own weight and the formwork elements without external assistance from formwork carriages. This self-service capability enables faster section-by-section concreting while maintaining structural stability throughout the process.
3Adaptability or versatility
If adjustable reinforcement layers are used, then adaptability to existing structures improves, but the device complexity increases
Solution Approach 1:
The reinforcement frame incorporates adjustable elements that allow modification of the frame geometry and reinforcement layer positioning. This dynamic adjustability enables the frame to adapt to various existing tunnel structures and cross-sectional shapes without requiring entirely different frame designs, achieving versatility through controlled adjustability rather than complete system complexity.
Data Source
Figure 1
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AI summary
The present invention relates to a frame construction (1) for the construction of the inner shell of a tube-like structure such as tunnels, underpasses or arched bridges, or-Cutouts with a plurality of frame elements (2) forming an open frame arch and comprising: a steel girder arch (9) with an inside and an outside, a reinforcement layer (15, 17) on the inside and/or the outside of the steel girder arch (9) which is attached to the steel girder arch (9) by means of retaining elements (14), a removable formwork layer (23) at a predetermined distance from the inside of the steel girder arch (9), first spacers (19) on the outside of the steel girder arch (9) for support against the outer wall (3) or the wall of the tube-like structure and second spacers (21) on the inside of the steel girder arch (9) for fixing the formwork layer (23), wherein the frame structure (1) is designed to be filled section by section with concrete (27) and thereby absorb the hydrostatic pressure of the concrete.