Double-Deck Bridge Jig Frame Demounting Method
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Solution Overview
Problem
Current methods for constructing multi-span double-deck steel structure bridges require a large number of jig frames, leading to high construction costs and prolonged construction periods, as all jig frames are laid before construction and disassembled after completion.
Innovation Solution
A double-deck multi-span bridge construction method that involves mounting and demounting jig frames in a span-separated mode, allowing for the reuse of upper and lower chord jig frames, thereby reducing construction costs and shortening the construction period by enabling simultaneous construction operations on disassembled spans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all jig frames are laid before construction and disassembled after completion, then the bridge structure can be supported during construction, but the construction cost is high and the construction period is long
Solution Approach 1:
The patent divides the bridge into multiple spans and applies different construction methods to different spans. The first span uses traditional complete support method, while subsequent spans use a segmented approach where jig frames are disassembled after supporting only the current span construction, allowing parallel construction activities across different spans.
Solution Approach 2:
The patent introduces a dynamic construction approach where the support method changes during construction. Jig frames are temporarily installed to support the current span, then disassembled and relocated to support the next span, transforming from a static complete-support system to a dynamic progressive-support system.
2Reliability
If all jig frames are laid before construction and disassembled after completion, then the bridge structure can be supported during construction, but the construction cost is high
Solution Approach 1:
The patent implements a recovery system where jig frames are not discarded after use but are disassembled, relocated, and reused for supporting the next span construction. This recovering approach reduces the total quantity of jig frames needed from requiring complete replacement to requiring only single-use installation per span.
Solution Approach 2:
The patent makes the jig frames universal by designing them to serve multiple functions: first supporting the first span construction, then being relocated to support the second span construction, and potentially reused again. This multi-functionality reduces the total number of jig frames required compared to traditional single-use approach.
3Ease of manufacture
If all jig frames are disassembled at one time, then the construction process is simplified, but the bridge structure cannot digest its internal deformation which may result in warping of the free end of mounting
Solution Approach 1:
The patent segments the jig frame disassembly process by span, where each span's jig frames are disassembled and relocated individually rather than all at once. This segmentation allows the bridge structure to progressively adapt to its final position span by span, preventing sudden deformation accumulation that could cause warping.
Solution Approach 2:
The patent applies preliminary action by gradually disassembling and relocating jig frames before the bridge construction is complete. This progressive preliminary disassembly allows the structure to gradually digest its internal deformations as each span is completed, preventing the accumulation of deformation that would occur if all jig frames were disassembled simultaneously at the end.
Data Source
AI summary
Disclosed in the present disclosure is a double-deck multi-span bridge construction method. According to the double-deck bridge construction method of the present disclosure, construction is carried out by using a method of disassembling a support jig frame in a graded and span-separated mode, an upper chord jig frame and a lower chord jig frame can be used in a recycle manner, and construction costs are reduced. In addition, a construction period of building the support jig frame is shortened, and other construction operations can be synchronously carried out on a span in which the jig frame is disassembled, for example, fire retardant coating construction can be carried out on a mounted bridge deck after the jig frame is disassembled, and the construction period of a double-deck multi-span bridge is effectively shortened. Additionally, according to the double-deck multi-span bridge construction method in embodiments of the present disclosure, the upper chord jig frame and the lower chord jig frame are disassembled in a graded manner, thereby ensuring that a bridge structure can be smoothly and safely transitioned to a designed stress state.