Manhole Shaft Wall Element Segmentation for Pipe Installation
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Solution Overview
Problem
Conventional shafts with plastic injection-molded wall elements struggle to accommodate existing pipes and cables during installation, as the wall openings are not easily accessible for passing through, leading to poor sealing against water and debris ingress.
Innovation Solution
The shaft design features detachable lower wall element parts with integrated frangible surfaces and spring locks, allowing for easy removal and reattachment to accommodate pipes and cables, and optional sealing with plugs to prevent ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the shaft is installed with pre-assembled wall elements having fixed wall openings, then the installation speed is high, but the adaptability to existing pipes and cables is poor
Solution Approach 1:
The lowest wall element is divided into two separable parts: an upper part and a lower part. This segmentation allows the wall element to be disassembled during installation to accommodate existing pipes and cables, then reassembled to restore the shaft's protective function. The division line runs through the middle of the wall element, creating two functional segments that can be independently positioned.
Solution Approach 2:
The wall element transitions from a static, fixed structure to a dynamic, adjustable structure. The detachable connection between upper and lower parts enables the wall element to change its configuration during installation - opening to accommodate pipes/cables and closing to provide protection. This dynamic capability resolves the contradiction between installation speed and adaptability.
2Adaptability or versatility
If wall openings are created by drilling or cutting during installation, then the adaptability to pipes and cables is improved, but the installation time increases and sealing reliability decreases
Solution Approach 1:
The wall openings are pre-formed as integrated breaking surfaces during the injection molding process, rather than being created during installation. This preliminary action eliminates the need for time-consuming drilling or cutting operations. The breaking surfaces are positioned and sized to match common pipe and cable configurations, enabling quick adaptation without additional installation time.
Solution Approach 2:
The wall element's opening configuration is changed by breaking out predetermined frangible surfaces rather than drilling or cutting. This parameter change approach transforms the wall material from solid to opened state through controlled fracture, which is faster and more reliable than mechanical removal methods. The breaking surfaces are designed with specific geometric parameters that facilitate clean, predictable opening formation.
3Adaptability or versatility
If wall openings are created by drilling or cutting, then pipes and cables can be routed through, but the sealing against water and debris ingress becomes unreliable
Solution Approach 1:
The opening method changes from mechanical drilling/cutting to controlled breaking of frangible surfaces. This parameter change in the opening process creates cleaner, more precise openings that maintain better edge integrity. The breaking surfaces are designed with specific thickness and geometry parameters that ensure clean fracture planes, providing reliable sealing surfaces for plugs and maintaining structural integrity around the openings.
Solution Approach 2:
The breaking surfaces are designed as precise copies or templates of the required opening shapes and sizes. During installation, these pre-designed breaking surfaces are broken out to create exact openings that match the pipe or cable dimensions. This copying approach ensures consistent, reliable sealing geometry without the variability introduced by manual drilling or cutting operations.
4Adaptability or versatility
If the lowest wall element is made detachable, then the adaptability to existing infrastructure is improved, but the device complexity increases
Solution Approach 1:
The lowest wall element is segmented into upper and lower parts connected by detachable fasteners. This segmentation provides the necessary adaptability while keeping the complexity localized to only the lowest element. The fastener system uses simple, standardized components that minimize complexity. Other wall elements remain as simple, monolithic structures, so the complexity increase is confined to a single location rather than propagating through the entire shaft structure.
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
Enables seamless installation of the shaft on continuous pipes and cables by allowing quick adjustment of wall openings, ensuring effective sealing against water and debris.
Implementation Method 1
spring-loaded fasteners on both sides. The spring-loaded fasteners can be designed such that they can be retracted laterally from the lower wall element section against the force of their springs
Implementation Method 2
The wall elements have integrated predetermined breaking surfaces, which are usually circular and designed to be broken out as needed to create wall openings
Data Source
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AI summary
The shaft, whose shaft walls consist of superimposed wall elements into which pipe inlets can be inserted, through which cables, pipe assemblies and/or pipes can enter and/or exit the shaft, is characterized in that at least one wall element in at least one shaft wall is divided into an upper and a lower wall element part, which are detachably assembled, with the dividing line running approximately through the middle of the wall element.