Wall Feedthrough Bushing for Compact Watertight Cable Casting
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Solution Overview
Problem
Existing feedthrough solutions for pouring into wall elements, such as concrete, face challenges in compact installation, accessibility, and maintaining a watertight seal, especially in cramped conditions and under time pressure during construction, where connection points can lead to contamination and leaks.
Innovation Solution
A bushing with an everted section that is everted during pouring and then fitted with a protective tube, allowing for easy insertion and sealing of cables, featuring a toothed ring for secure attachment and a sealing sleeve with a circumferential lip for stability, which simplifies handling and reduces connection points, ensuring a reliable seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the feedthrough is installed in a compact form during casting, then the formwork is simplified and installation in thin wall elements is enabled, but the accessibility for inserting protective pipes becomes difficult
Solution Approach 1:
The feedthrough incorporates a dynamic transformation capability where the protective pipe insertion section transitions from a compact folded-in state during casting to an accessible folded-out state after casting. This dynamic reconfiguration allows the same structure to satisfy both compact installation requirements and ease of pipe insertion operations at different stages.
Solution Approach 2:
The feedthrough is divided into distinct functional sections: a stationary casting section that remains integrated with the wall element, and a movable protective pipe insertion section that can be folded out independently. This segmentation allows the insertion section to be manipulated separately for ease of access while maintaining the overall compact form during casting.
2Adaptability or versatility
If multiple connection points are used for protective pipes, then installation flexibility is improved, but the risk of contamination and leaks increases
Solution Approach 1:
Multiple protective pipe insertion functions are merged into a single integrated feedthrough structure with a unified sealing system. Instead of having separate connection points that each require individual sealing, the invention consolidates all pipe insertions through one sealed chamber, reducing the number of potential leak paths while maintaining flexibility for multiple pipes.
Solution Approach 2:
The invention converts the potential harm of multiple connection points (increased leak risk) into a benefit by designing a single sealed chamber that can accommodate multiple pipes. The sealing mechanism is applied once at the chamber level rather than repeatedly at each connection point, transforming the complexity of multiple seals into a single reliable sealing solution.
3Loss of time
If the protective pipe is connected early during construction, then installation time is reduced, but the connection point becomes inaccessible later for quality checks
Solution Approach 1:
The feedthrough is pre-configured with the protective pipe insertion section in a folded-in state during casting, allowing early connection of protective pipes without requiring subsequent access to the connection point. The preliminary design enables all necessary connections to be made while the structure is still accessible, eliminating the need for future disassembly or access to sealed connections.
Data Source
Figure 1
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AI summary
The invention relates to the use of a feedthrough (1) for casting into a wall element and passing a line (33) through it, wherein the feedthrough (1) has a slit section (2a) which is inverted during the casting of the feedthrough (1) and is slit out after the casting of the feedthrough (1), wherein a protective tube (31) is then inserted into the slit section (2a), in which protective tube (31) the line (33) is laid.