Precast Bridge Edge Termination With Base-Anchored Fastening
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Solution Overview
Problem
Existing bridge edge termination methods, such as using steel edge caps, are costly and require complex formwork construction and removal, and do not effectively address aesthetic and corrosion protection needs.
Innovation Solution
A precast concrete bridge edge termination element with fastening connections in the base area, allowing for easy attachment to a bridge superstructure and subsequent monolithic connection with cast-in-place concrete, featuring corrosion protection and simplified manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If steel edge caps are used for bridge edge termination, then durability and corrosion protection are improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The invention uses a composite structure combining precast concrete formwork section with steel fastening connections. The precast concrete provides durability and corrosion resistance while the steel fastening connections (anchoring bolts, welding connections) provide secure attachment. This composite approach achieves the corrosion protection of steel components without requiring the entire edge cap to be made of expensive steel, thus reducing manufacturing cost while maintaining reliability.
2Shape
If cast-in-place concrete edge caps are used, then aesthetic requirements are met, but construction time and device complexity increase due to formwork
Solution Approach 1:
The formwork section is precast in a controlled environment before being installed on the bridge. This preliminary action allows the formwork to be manufactured with precise aesthetic details and surface finishes without affecting the construction schedule. The precast formwork section is then quickly installed and filled with cast-in-place concrete, eliminating the need for complex on-site formwork construction and acceleration of the overall construction process.
Solution Approach 2:
The edge cap system is segmented into a precast formwork section and a cast-in-place concrete section. The precast formwork section serves as both the formwork and a structural component, while the cast-in-place concrete provides the final aesthetic finish. This segmentation allows parallel production of the precast section while preparing the bridge deck, reducing total construction time while maintaining aesthetic quality.
3Strength
If fastening connections are embedded in the outer wall of precast concrete, then connection strength is improved, but wall thickness and material usage increase
Solution Approach 1:
The fastening connections are localized to the base area of the precast formwork section rather than being distributed throughout the outer wall. This local concentration of connection elements allows for optimized material usage - concrete is provided only where structurally necessary for anchoring, while the rest of the structure uses minimal concrete thickness. This reduces overall material consumption while maintaining connection strength at the critical anchoring location.
4Ease of operation
If steel fastening connections are used, then ease of installation is improved, but corrosion risk and manufacturing cost increase
Solution Approach 1:
The precast concrete formwork section serves as an intermediary protective layer between the steel fastening connections and the corrosive environment. The concrete encases the steel anchoring bolts and welding connections, providing corrosion protection while allowing the steel components to maintain their ease-of-installation advantages. This intermediary concrete layer enables the use of steel fastening connections without exposing them to direct corrosion risks.
Data Source
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AI summary
Bridge edge termination element for the lateral fastening of a bridge superstructure, comprising a precast formwork section and fastening connections arranged such that they rest on a horizontal surface of the bridge superstructure on the upper side, characterized in that the precast formwork section is designed as a precast concrete element with a base area and an outer wall and the fastening connections for force transmission are arranged exclusively in the base area of the precast concrete element.