Sewer Pipe Restoration Using Dummy Jig for Feasibility Assessment
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Solution Overview
Problem
Conventional methods for restoring sewer pipes face challenges such as difficulty in pulling in restoration pipes with larger diameters, reduced drainage ability post-restoration, and the need for occupying manhole spaces, which can cause traffic jams and compromise long-term stability and safety.
Innovation Solution
A restoration pipe pulling-in method involving a dummy pipe with a determination jig to assess feasibility, a pull-in jig for smooth insertion, and a winch system that allows continuous pulling over multiple spans without occupying manhole spaces, enabling pipes to be restored with larger diameters and maintaining sewer functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a restoration pipe with a larger diameter is pulled into the sewer pipe, then the drainage ability is improved, but the pipe cannot be pulled in due to shifts or bends in the connection portion
Solution Approach 1:
The patent applies preliminary action by first performing a feasibility assessment using a determination jig before attempting to pull in the restoration pipe. The determination jig is inserted into the sewer pipe to check for obstacles, shifts, or bends that would prevent successful pulling-in. This preliminary check allows planners to identify potential issues and prepare appropriate countermeasures, such as selecting a more flexible pipe or modifying the pulling-in method, thereby ensuring that the larger-diameter restoration pipe can be successfully installed without being blocked by connection portion defects.
2Ease of operation
If the restoration pipe outer diameter is considerably smaller than the sewer pipe inner diameter, then the pipe can be pulled in easily, but the diameter of the restored pipeline is reduced and drainage ability deteriorates
Solution Approach 1:
The determination jig performs a preliminary assessment of the sewer pipe's internal geometry, including any shifts, bends, or obstacles in the connection portions. This information is used to select an appropriately sized restoration pipe that maximizes drainage capacity while still being pullably through the existing pipe. The feasibility assessment ensures that the optimal pipe diameter is chosen beforehand, avoiding the need to use excessively small pipes that would compromise drainage ability.
3Productivity
If manhole spaces are occupied for pulling-in work, then the restoration work can be performed, but traffic jams occur and access is disrupted
Solution Approach 1:
The feasibility assessment using the determination jig is performed before scheduling the main restoration work, allowing planners to evaluate whether the connection portions are suitable for pulling-in and to prepare necessary countermeasures in advance. This preliminary planning enables more efficient execution of the restoration work, reducing the time that manholes need to be occupied and minimizing traffic disruption. By identifying potential issues beforehand, the actual pulling-in operation can be completed more quickly and smoothly.
Data Source
AI summary
Provided is a restoration pipe pulling-in method which can easily determine whether pilling-in of a restoration pipe is possible wherein the restoration pipe has a diameter as much as large relative to a deteriorated drainage channel, and which can pulling a restoration pipe into a sewer pipe wherein the gap between the restoration pipe and the sewer pipe is shorter. The restoration pipe pulling-in method comprises preparing a dummy restoration pipe 30′ which imitates the restoration pipe; attaching a determination jig 10 for determining whether pulling-in of the restoration pipe is possible to an insertion-side leading end portion of the dummy restoration pipe 30′; pulling the dummy restoration pipe 30′ with the determination jig 10 into the existing pipe 1; after confirming completion of passing-through of the dummy restoration pipe 30′ with the determination jig 10, attaching a pull-in jig to a leading end portion of the restoration pipe; and arranging the restoration pipe over an entire length of the existing pipe 1, by inserting the restoration pipe with the pull-in jig, through an upper opening 2b of the existing pipe 1, into the existing pipe 1, and by pulling the pull-in jig with a wire.