Expandable Lining Tube for Sewer Shaft Diameter Jumps
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Solution Overview
Problem
Existing lining tubes struggle to restore sewer shafts with varying inner diameters, including the berm and channel, using a single lining tube, due to diameter jumps and the need for custom winding mandrels, which increases production costs and requires labor-intensive manual processes.
Innovation Solution
A cylindrical lining tube with a radially expandable layer of fiber material, impregnated with a curable reaction resin, is designed to adapt to different diameters. The tube includes an inner film tube with a desired breaking location for radial expansion and a tear-resistant outer film tube that can expand to fit various sewer shaft diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional lining tubes with maximum 10% expansion are used, then the inner film tube and glass fiber winding remain undamaged, but they cannot cover large diameter jumps between upper and lower sewer portions
Solution Approach 1:
The lining tube is divided into multiple expandable sections or layers that can progressively expand to accommodate large diameter changes. The glass fiber winding is arranged in multiple layers that can expand at different stages, allowing the tube to adapt to diameter jumps exceeding 10% without damaging any single layer.
Solution Approach 2:
The lining tube incorporates dynamic expansion capabilities through progressive inflation stages. The tube can expand in multiple steps from its initial diameter to the final expanded diameter, allowing it to adapt to varying sewer shaft diameters while maintaining structural integrity throughout the expansion process.
2Adaptability or versatility
If custom winding mandrels are produced for each sewer shaft embodiment, then lining tubes can be made for shafts with conical transition portions and large diameter jumps, but production costs increase significantly
Solution Approach 1:
A single standardized winding mandrel design is used to produce lining tubes that can universally fit multiple sewer shaft embodiments. The mandrel produces tubes with predetermined expansion characteristics that can adapt to various shaft diameters and conical transition portions, eliminating the need for custom mandrels for each shaft type.
Solution Approach 2:
The lining tube incorporates adjustable parameters such as variable wall thickness, progressive expansion zones, and flexible fiber winding patterns that allow a single mandrel-produced tube to adapt to different shaft dimensions. These parameter variations are built into the tube design rather than requiring custom mandrels.
3Adaptability or versatility
If manual lining of berm and channel is performed using molded components or liquid coatings, then complete restoration of sewer shaft is achieved, but labor intensity and costs increase
Solution Approach 1:
The lining tube design integrates coverage for the berm and channel regions directly into the tube structure. The tube is configured to extend and conform to these transitional zones, combining what would previously require separate manual lining operations into a single integrated installation process.
Solution Approach 2:
The lining tube is designed to automatically conform to and line the berm and channel regions through its expansion mechanism. As the tube expands, it naturally adapts to the geometry of these zones without requiring manual intervention or additional components, allowing the system to serve itself in covering all shaft regions.
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
The solution enables the restoration of sewer shafts with different diameters using a single lining tube, reducing production costs and labor intensity while ensuring effective lining of the berm and channel in a single working operation.
Implementation Method 1
cured by means of light from a UV source
Implementation Method 2
cured by means of light from a UV source, or alternatively by introducing hot vapor
Implementation Method 3
expanded by means of compressed air
Data Source
AI summary
A lining tube for restoring a defective sewer shaft has an inner film tube and a radially expandable tubular layer of fiber material impregnated with a curable reaction resin. The inner film tube has a connecting portion that connects two circumferential portions, to a circumferentially closed inner film tube with a defined nominal diameter. The connecting portion has a predetermined breaking point that can be separated in the circumferential direction by introducing a pressure medium into the inner film tube in order to radially expand the inner film tube and the layer of fibrous material beyond the nominal diameter. The tubular layer of fiber material is closed by a seam at a first end that can be introduced into a channel of the sewer shaft. The seam extends orthogonally to the longitudinal axis of the tubular layer of fiber material of the lining tube.