Bridge Edge Termination Element for Monolithic Concrete Casting
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Solution Overview
Problem
Existing methods for fastening bridge superstructures using edge caps are inefficient, causing significant traffic disruptions due to the need for full closures, and result in complex and heavy prefabricated components that are difficult to handle and adjust.
Innovation Solution
A prefabricated bridge edge closure element designed as a formwork element with fastening connections on a horizontal surface, featuring a channel-shaped cavity for in-situ concrete casting, allowing for self-supporting placement and monolithic concrete casting with the road substructure, reducing adjustment effort and eliminating the need for external formwork.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cast-in-place concrete edge caps are used with formwork, then edge reinforcement is achieved, but complete road closure is required causing traffic disruptions
Solution Approach 1:
The edge cap system is divided into a prefabricated formwork element (providing immediate structural support) and cast-in-place concrete (providing final monolithic integration). This segmentation allows the formwork element to be installed quickly without full formwork, reducing traffic disruption while maintaining edge reinforcement stability.
Solution Approach 2:
The prefabricated formwork element is prepared in advance off-site and delivered to the construction location. This preliminary action allows the element to be installed quickly on the bridge, providing immediate edge reinforcement without requiring the time-consuming on-site formwork construction and demolding process.
2Productivity
If prefabricated bridge caps are used to reduce construction time, then assembly speed improves, but the caps become massive and heavy requiring complex handling
Solution Approach 1:
The edge cap system is segmented into a lightweight prefabricated formwork element and cast-in-place concrete. The formwork element serves as a temporary support structure that guides the concrete placement, eliminating the need for a single massive prefabricated cap while maintaining assembly speed.
Solution Approach 2:
The solution combines the prefabricated formwork element (made from materials like steel, textile-reinforced concrete, or glass fiber-reinforced plastic) with cast-in-place concrete. This composite approach creates a lightweight formwork element that provides sufficient support during installation while the final concrete structure achieves the required load-bearing capacity.
3Adaptability or versatility
If prefabricated components with sealing joints are used, then flexibility improves, but fastening complexity increases
Solution Approach 1:
The fastening system is segmented into simple fastening connections on the prefabricated formwork element and the sealing joint between the element and bridge superstructure. This segmentation allows each component to perform its specific function independently, maintaining flexibility while reducing overall complexity compared to fully adjustable fastening systems.
Data Source
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AI summary
A bridge edge termination element (2) for the lateral fastening of a bridge superstructure is designed such that it has a contact flank (3) for lateral contact and fixation to the bridge superstructure and fastening connections (6) arranged so that they bear on a horizontal surface of the bridge superstructure on their upper side. The element (2) forms a cavity between the contact flank (3), a base area (4), and an outer wall (5), which has a channel shape that is at least partially open at the top and serves to receive cast-in-place concrete (O), optionally with cast-in-place concrete topping. Such elements (2) are used to fasten a bridge superstructure by means of edge caps (1) by attaching the necessary quantity of bridge edge termination elements (2) to the bridge superstructure on their upper side to achieve the required length, if necessary.An additional formwork is installed to create an inner edge closure for the bridge driving and/or walking path, the channel-shaped cavity of the bridge edge closure element (2) and, if applicable, the additional formwork is filled with cast-in-place concrete (O), and, if applicable, the additional formwork is removed.