Temporary Support System for Pre-fabricated Box Girder Bridges
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Solution Overview
Problem
Existing temporary support systems for road bridges with pre-fabricated small box girders have limited load-bearing capacity and restricted space, making them unsuitable for construction with pre-fabricated small box girders, which are heavier and require more efficient support systems to enhance construction efficiency.
Innovation Solution
A temporary support system comprising a main beam connected to main and lateral pier support systems, featuring a W-shaped truss to distribute bending moments uniformly and increase load-bearing capacity, allowing for efficient assembly and disassembly while accommodating larger vehicles and improving construction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional temporary support system with dense vertical supports is used, then the load-bearing capacity is improved, but the space for vehicle passage is blocked and assembly/disassembly becomes difficult
Solution Approach 1:
The support system is segmented into discrete modular units (support pillars with standardized dimensions and connection interfaces) that can be independently positioned and assembled. This segmentation allows the system to provide sufficient load-bearing capacity at critical points while leaving the spaces between modules open for vehicle passage and operational access.
2Productivity
If pre-fabricated small box girders are used instead of cast-in-place box girders, then construction cost is reduced and construction period is shortened, but the girder weight increases significantly requiring higher load-bearing capacity
Solution Approach 1:
The support system parameters (pillar spacing, pillar dimensions, material specifications) are specifically optimized to match the load characteristics of pre-fabricated small box girders. The pillar spacing is set at 12.5m and dimensions are standardized to provide adequate bearing capacity for the heavier girders while maintaining construction efficiency benefits.
3Ease of manufacture
If the support system is designed for PC hollow slab girder construction, then the support structure is established, but it has limited load-bearing capacity and is not applicable to pre-fabricated small box girders which are three times heavier
Solution Approach 1:
The support system parameters are specifically changed and optimized for pre-fabricated small box girder construction. Pillar spacing is standardized at 12.5m, pillar dimensions are increased to provide adequate bearing capacity for 90-ton girders, and the overall structural configuration is adjusted to handle the significantly higher loads compared to PC hollow slab girder construction.
4Stability of the object's composition
If dense rod members are disposed in the support area to reduce main support pillar length ratio, then the calculated length of diagonal strut is reduced and overall stability is improved, but vehicles cannot pass and assembly/disassembly is required
Solution Approach 1:
The support system uses segmented modular pillars with standardized spacing of 12.5m, creating open spaces between modules that allow vehicle passage. The modular design maintains overall stability through standardized connection interfaces and structural configuration while avoiding the need for dense rod members that would block access.
Data Source
AI summary
A temporary support system for a road bridge pre-fabricated small box girder-type concealed bent cap, and a method of constructing same. The support system comprises a main beam, a main pier support system, and a lateral pier support system; the main beam is arranged on the transverse side of road bridge piers; the main pier support system is disposed on the transverse side of a main pier area and is located under the main beam; the lower end of the main pier support system is fixed to a main pier bearing platform, whereas the upper end is fixed to the main beam; the lateral pier support system is disposed on the transverse side of a lateral pier area and is located below the main beam; and the lower end of the lateral pier support system is fixed to a lateral pier bearing platform, whereas the upper end is fixed to the main beam.