Resizing Sleeve for Sewer Pipe Diameter Transition
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Solution Overview
Problem
Existing methods fail to provide a reliable and efficient solution for overlapped sleeving in sewer pipeline assemblies where the branch line diameter is smaller than the trunk line diameter, requiring separate liner elements and complex installation processes.
Innovation Solution
A method and tool for preparing a resizing sleeve by stretching it to the diameter of the thicker pipe using a preparation tool, attaching an installation hat, and then returning it to the thinner diameter, allowing for airtight installation and curing with epoxy resin, followed by removal of the hat and opening the trunk line for access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate liner elements are used for joining points with different diameters, then the pipe assembly can be lined, but the installation process becomes complex and difficult to meet quality standards
Solution Approach 1:
The liner element is divided into two functional segments: a resizing sleeve that expands to match the trunk line diameter and an installation hat that remains at the original smaller diameter. This segmentation allows each part to perform its specific function optimally - the resizing sleeve adapts to the larger diameter for proper fitting while the installation hat maintains the original configuration for easier installation and removal.
Solution Approach 2:
The resizing sleeve is designed to be dynamically changeable in diameter. It can be expanded from its original smaller diameter to match the larger trunk line diameter during installation, and then contracted back to its original size after the installation hat is removed. This dynamic transformation simplifies the installation process by allowing a single liner element to adapt to different diameter requirements.
2Manufacturing precision
If a resizing sleeve is stretched to the diameter of the thicker pipe, then overlapped sleeving can be achieved, but the sleeve must be returned to the thinner diameter for proper installation
Solution Approach 1:
The resizing sleeve is pre-expanded to the larger diameter using an expansion tool before installation. This preliminary action ensures that the sleeve achieves the correct diameter precision for fitting the trunk line without requiring complex adjustments during the actual installation process. The sleeve is then contracted back to its original size after the installation hat is attached, preparing it for proper installation in the pipe assembly.
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 efficient and quality-standard-compliant installation of resizing sleeves in sewer pipeline assemblies with varying diameters, ensuring proper attachment and easy removal of the installation hat, simplifying the process and improving installation quality.
Implementation Method 1
a preparation pipe which expands under the influence of air pressure arranged in the tool to the size of the thicker pipe in diameter
Implementation Method 2
a resizing sleeve which is stretchable to the thickness of the thicker pipe
Implementation Method 3
the resizing sleeve has cured and attached to the sewer pipe to be lined
Implementation Method 4
Overpressure is maintained in the pipe, until the resizing sleeve has cured and attached to the sewer pipe
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 2a~2c
AI summary
The invention relates to a method for preparing a resizing sleeve (1 1 1, 203) for lining a joining point in a pipe assembly comprising pipes of thicker (201 ) and thinner (202) diameter. The method is characterized in that it comprises the steps for stretching the resizing sleeve (1 1 1, 203) in diameter to the size of the thicker pipe (201 ) in diameter of the pipe assembly, installing an installation hat (1 10, 204) according to the thicker pipe (201 ) in diameter of the pipe assembly by airtightly gluing it onto the stretched resizing sleeve (1 1 1, 203), and returning the resizing sleeve (1 1 1, 203) to the size of the thinner pipe (202) in diameter of the pipe assembly to be lined. A suitable tool (100) for implementing the method is also presented.