Air Removing Tool for Gap Filling in Conduit Lining
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Solution Overview
Problem
Existing methods for filling gaps between conduits and lining materials often result in incomplete air removal due to the filler material entering the air removing tool before all air is discharged, leading to non-uniform filling and potential strength reduction.
Innovation Solution
An air removing tool with a leading end face that contacts the conduit's inner surface throughout its circumference, allowing air to be discharged before the filler material enters, and additional steps to ensure complete air and stagnant water removal, including adjusting the tool's position and using cut grooves for efficient discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a bamboo-spear shaped air removing tool is used with its leading end portion brought into contact with the inner surface of the conduit, then air discharge is enabled, but the filler material may enter the tool through the opening at the leading end portion before air is completely removed
Solution Approach 1:
The leading end face of the air removing tool is divided into multiple air removing portions (e.g., multiple openings or grooves) instead of a single opening. This segmentation allows air to escape through multiple paths simultaneously, increasing air discharge efficiency while preventing filler material from entering through any single opening, thus resolving the contradiction between air discharge capability and filling uniformity.
2Ease of operation
If the leading end portion of the air removing tool is pointed (bamboo-spear shape), then it can be brought into contact with the inner surface of the conduit, but air remaining in the vicinity of the inner surface cannot be completely discharged
Solution Approach 1:
The leading end face of the air removing tool is designed with different local qualities: it has a flat face that contacts the conduit inner surface, and multiple air removing portions (openings or grooves) distributed across this face. This local differentiation allows the tool to maintain contact with the conduit while providing multiple air escape paths at different locations, ensuring complete air removal from various regions of the gap.
3Productivity
If the filler material injection proceeds until the level reaches the bamboo-spear shape portion of the air removing tool, then filling progresses, but filler material enters the tool and creates hollows in the gap
Solution Approach 1:
The air removing tool is pre-installed in the gap before filler material injection begins. The tool's leading end face with multiple air removing portions is positioned to contact the conduit inner surface beforehand. This preliminary setup ensures that air can be discharged efficiently during the entire filling process, preventing filler material from entering the tool and creating hollows, thus maintaining both filling speed and strength.
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
Ensures uniform filling of the gap with the filler material, complete removal of air and stagnant water, and prevents strength reduction by avoiding hollows between the conduit and lining material.
Implementation Method 1
expelling air from the gap through a leading end of the air removing tool
Implementation Method 2
injecting the filler material into the gap through a filling port provided through a lower portion of the lining material
Data Source
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AI summary
An object is to provide a method for filling a gap with a filler material, the method enabling prevention of inflow of the filler material into an air removing tool through its opening before complete removal of air from the gap, and enabling uniform filling of the gap with the filler material. A method for filling a gap with a filler material is provided, the gap being between an existing conduit P and a lining material 100 provided inside the existing conduit P. The method includes: an air removing tool attaching step of inserting an air removing tool 200 into an air removing hole 3a bored through the lining material 100, and bringing a leading end face of the air removing tool 200 into contact with the inner circumferential surface of the existing conduit P; and a filling step of injecting the filler material into the gap while expelling air from the gap through a leading end of the air removing tool 200, the air removing tool 200 including, at its leading end, an air removing portion through which air is discharged.