Railway Bridge Steel Sleeper Frictional Connection
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Solution Overview
Problem
Existing railway bridge systems with I-shaped steel sleepers face challenges in achieving a sufficient frictional connection and efficient installation, leading to economic inefficiencies due to alignment and drilling difficulties.
Innovation Solution
The implementation of vertically running metal sheets and crossbars on steel sleepers, which can be connected to bridge angles via screwing or a clamping angle system, enhances the frictional connection and simplifies the assembly process by using pre-fabricated through-holes and adjustable components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel sleepers are connected to girders using traditional connection methods, then the structural strength is maintained, but the frictional connection is insufficient and installation is difficult
Solution Approach 1:
The connection system is divided into separate functional components: metal sheets attached to steel sleepers, crossbars with pre-drilled holes for alignment, and bridge angles for final fixation. This segmentation allows each component to perform its specific function optimally while simplifying the overall installation process.
Solution Approach 2:
Metal sheets are pre-attached to the steel sleepers at the factory, and crossbars are pre-drilled with alignment holes before site installation. This preliminary preparation eliminates the need for complex alignment and drilling operations on the construction site, significantly reducing installation difficulty.
2Productivity
If traditional connection methods are used, then alignment and drilling work can be performed, but the installation process is time-consuming and economically inefficient
Solution Approach 1:
All preparation work including attachment of metal sheets to steel sleepers and drilling of alignment holes in crossbars is completed at the factory before delivery to the construction site. This eliminates time-consuming on-site alignment and drilling operations, dramatically improving assembly efficiency and reducing installation time.
Solution Approach 2:
Crossbars serve as intermediary components that bridge the steel sleepers and bridge angles. The pre-drilled holes in crossbars facilitate quick alignment and connection, acting as a mediator that simplifies the connection process between the sleeper and the girder support structure.
3Strength
If metal sheets and crossbars are used to form the connection area, then frictional connection is improved, but the device complexity increases
Solution Approach 1:
The connection structure is segmented into simple, standardized components: metal sheets, crossbars, and bridge angles. Each component has a single, well-defined function, which simplifies manufacturing, quality control, and installation despite the multi-component nature of the overall connection system.
Solution Approach 2:
The metal sheets and crossbars are designed to work together in a self-aligning manner. The pre-drilled holes in the crossbars automatically align with the metal sheets on the steel sleepers, eliminating the need for complex adjustment mechanisms or skilled alignment operations during installation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides a more efficient and cost-effective assembly process with improved frictional connection between steel sleepers and girders, allowing for easier installation and reuse of existing bridge brackets, thereby enhancing economic efficiency.
Implementation Method 1
it is not possible to produce a sufficient frictional connection in the connection area between steel sleepers and beams
Data Source
Figure 1
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Figure 3
AI summary
The bridge is assembled of carrying elements (3) and steel sleepers (4) transversally positioned on top of the elements (3). The joint area between them comprises several vertically positioned metal elements (7) and transversally positioned cross brackets (10). The sleepers (4) are either screwed to one of the angles (9) at the bridge or joined with clamping elements if no angles (9) are available. Each of the cross brackets (10) is prepared with exactly positioned bores. Only the metal elements (7) have to be processed at the final destination in order to be screwed to the brackets (10). An independent claim is given for a holding system to be added to the bridge.