Synchronous Composite Lining Construction for Shield Tunnel Efficiency
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Solution Overview
Problem
Current methods for constructing single-bore double-track composite lining shield tunnels face challenges in efficiency and quality due to complex geological conditions and increased functional requirements, such as fire protection and durability, which are not met by existing synchronous construction methods.
Innovation Solution
A construction method that involves synchronous composite lining construction during tunnel boring, using a sequence of installing a prefabricated box culvert component, casting a two-lining bottom arch wall, a flue sheet and lining arch wall, an arch top lining, and a mid-partition, with reinforcing steel bars and a specific order of construction to ensure stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If composite lining construction is conducted after tunnel boring is completed, then construction quality can be ensured, but construction period is extended and efficiency is reduced
Solution Approach 1:
The patent applies preliminary action by installing the prefabricated box culvert component and conducting composite lining construction on the middle and rear sections during the tunnel boring process itself, rather than waiting until boring is complete. This allows the lining to be prepared in advance while the shield machine continues advancing, thereby improving construction efficiency without compromising quality
Solution Approach 2:
The patent segments the tunnel into front section, middle section, and rear section, with different construction approaches for each. The middle and rear sections receive composite lining during boring, while the front section receives lining after boring completion. This segmentation allows simultaneous progression of multiple construction activities, resolving the contradiction between quality and efficiency
2Productivity
If composite lining construction is conducted synchronously during tunnel boring, then construction efficiency is improved, but construction complexity increases
Solution Approach 1:
The construction process is divided into distinct segments: front section (lined after boring), middle section (lined during boring with prefabricated box culvert), and rear section (lined during boring). This segmentation simplifies the overall complexity by allowing each segment to be handled with specialized, standardized procedures rather than attempting to manage the entire tunnel uniformly
Solution Approach 2:
The prefabricated box culvert component serves as an intermediary element that facilitates synchronous composite lining construction. It provides a pre-fabricated structure that can be quickly installed during boring, reducing the complexity of on-site construction while maintaining efficiency gains
3Ease of manufacture
If traditional lining construction method is used, then construction process is simple, but fire protection and durability requirements are not met
Solution Approach 1:
The patent employs composite lining construction combining the prefabricated box culvert component (providing fire protection) with the tunnel lining structure (providing durability and structural support). This composite approach meets both fire protection and durability requirements while maintaining construction feasibility through standardized installation procedures
Solution Approach 2:
The fire protection function is localized to the prefabricated box culvert component installed in the middle and rear sections, while the overall lining structure provides durability throughout. This local quality approach allows different functional requirements to be met in different locations without complicating the entire construction process
Data Source
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AI summary
The present invention relates to the field of shield tunnel construction, and provides a construction method for an inner structure of a single-bore double-track composite lining shield tunnel. The method mainly include: a first stage and a second stage; in the first stage, composite lining construction is conducted on a middle section and/or a rear section of the tunnel synchronously during tunnel boring, and lining is conducted on the tunnel by adopting an order of first lining and then splitting from bottom to top in the composite lining construction; and the second stage is a construction stage after the tunnel is bored through. With the adoption of the construction method, the construction of the inner lining structure is conducted on the middle section and/or the rear section of the tunnel synchronously during shield tunnel boring, and thus the construction efficiency is improved; moreover, the order of first lining and then splitting from bottom to top is generally adopted in the composite lining construction, and thus, the stability of the interior of the tunnel can be guaranteed, and smooth passing in a construction space is also guaranteed. The construction method provided by the present invention has good practicability.