Steel-Concrete Skewback for Arch Bridge Thrust Transmission
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Solution Overview
Problem
Existing steel-concrete combined skewback structures cannot be effectively connected with bearing platforms, leading to inadequate transverse thrust transmission and limited structural strength enhancement for arch bridges.
Innovation Solution
A steel-concrete combined skewback structure that includes arch rib tubes, concrete sections in a main chord pipe, concrete blocks in a skewback, and a steel structure box unit with fixing steel tubes, transverse, and vertical diaphragm units to ensure full connection with the bearing platform and enhanced structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel-concrete combined skewback is used to combine tensile characteristics of steel and compression-resistant characteristics of concrete, then the compressive strength and deformation resistance of the skewback are improved, but the skewback cannot be effectively connected with the bearing platform, resulting in inability to transmit transverse thrust
Solution Approach 1:
The skewback is divided into steel components (skewback beams, connecting rods) and concrete components (concrete core, concrete filling), with each segment serving specific functions. The steel skewback beams provide tensile resistance while the concrete core provides compression resistance, and they are connected through steel-concrete interaction to achieve both strength improvement and reliable connection with the bearing platform.
Solution Approach 2:
The invention uses composite steel-concrete structure where steel skewback beams and concrete core work together. The steel components provide ductility and tensile strength, while the concrete provides compression strength. This composite approach resolves the contradiction by combining the advantages of both materials to achieve both high compressive strength and reliable connection capability.
2Stability of the object's composition
If the skewback is filled with concrete to improve stability and increase compressive strength, then the deformation resistance is improved, but the quantity, sizes and dip angles of bearing plates cannot be freely adjusted
Solution Approach 1:
The skewback is segmented into a concrete core for stability and steel components for adaptability. The concrete core provides consistent compressive strength and stability, while the steel skewback beams and connecting rods can be independently designed and adjusted in quantity, size, and dip angle to meet different structural requirements.
Solution Approach 2:
Different parts of the skewback have different properties: the concrete core provides uniform compressive strength and stability throughout, while the steel components at specific locations (bearing plates, connecting rods) can be locally adjusted in quantity, size, and orientation to achieve the required adaptability for different arch rib configurations.
3Ease of manufacture
If the skewback is simply vertically supported by the bearing platform, then the construction process is simple, but the transverse thrust cannot be transmitted to the bearing platform, limiting the structural strength enhancement
Solution Approach 1:
The bearing plates are pre-installed on the bearing platform before the skewback structure is constructed. This preliminary action ensures that the connection path for transverse thrust transmission is already in place, allowing the steel skewback beams to effectively transfer loads to the bearing platform while maintaining construction simplicity.
Solution Approach 2:
The steel skewback beams act as intermediaries between the concrete core and the bearing platform. They transmit not only vertical loads but also transverse thrusts from the arch ribs to the bearing platform, resolving the contradiction by providing an efficient load transmission path while keeping the construction process relatively simple.
Data Source
AI summary
The present disclosure belongs to the technical field of arch bridge structures, and particularly relates to a steel-concrete combined skewback structure and a construction method thereof. In the present disclosure, by arranging arch rib tubes, concrete sections in a main chord pipe, concrete blocks in a skewback, fixing steel tubes, a transverse diaphragm unit, and a vertical diaphragm unit, the steel-concrete combined skewback structure can achieve the following objectives that 1. the skewback structure can be fully connected with a bearing platform; and 2. the fixing steel tubes are fully filled with concrete. In addition, the present disclosure further provides the construction method of the above steel-concrete combined skewback structure. The construction method the skewback structure itself and its mounting manner both have sufficient structural stability.