Curved Grouting Channel for Trenchless Pipeline Uplift Repair
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Solution Overview
Problem
Current trenchless repair methods for small-diameter concrete drainage pipelines are inadequate as they cannot effectively address subsidence issues without trenching or entering the pipeline, limiting the ability to inject polymer materials to the bottom of subsiding sections.
Innovation Solution
A trenchless method involving drilling a straight hole channel, inserting a steel sleeve, and forming a curved hole channel using a flexible steel-wire pipe, followed by injecting a polymer material through a grouting pipe to uplift and reset subsiding pipeline sections, utilizing a pipeline video robot for detection and PVC-based pipes for flexibility and guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional trenchless repair methods are used for small-diameter pipelines, then the repair process can be conducted without trenching, but the ability to effectively address subsidence issues is limited
Solution Approach 1:
The patent employs a nested structure where the steel sleeve is inserted into the drilled hole, the guiding pipe is inserted into the steel sleeve, and the flexible steel-wire pipe is inserted into the guiding pipe. This multi-layer nesting enables the grouting device to reach the bottom of subsiding pipeline sections in small-diameter pipelines, effectively resolving the limitation of conventional trenchless methods while maintaining trenchless repair advantages
2Ease of manufacture
If a straight hole channel is drilled for grouting, then the drilling process is simple, but the grouting material cannot reach the bottom of subsiding pipeline sections
Solution Approach 1:
The patent transforms the straight hole channel into a curved hole channel by inserting the flexible steel-wire pipe into the guiding pipe and applying curvature. This allows the grouting material to follow the curved path and reach the bottom of subsiding pipeline sections, solving the problem of grouting inaccuracy while maintaining the simplicity of the initial straight drilling process
3Ease of operation
If the pipeline water supply is cut off for repair work, then people can enter the pipeline to conduct repairs, but construction conditions become difficult and poisoning risks exist
Solution Approach 1:
The patent extracts the repair function from human operators and transfers it to automated devices. The pipeline video robot detects subsidence locations, and the grouting device injects polymer materials without requiring human entry into the pipeline. This eliminates poisoning risks while maintaining effective repair capability through device-based operation
4Reliability
If polymer material is injected to uplift subsiding pipeline sections, then the pipeline can be reset, but the polymer material must reach the bottom of the subsiding section accurately
Solution Approach 1:
The patent introduces multiple intermediary components to facilitate accurate polymer material delivery: the steel sleeve provides structural support and guidance, the guiding pipe directs the flexible steel-wire pipe to the target location, and the grouting pipe delivers the polymer material. These intermediaries work together to achieve accurate grouting at the bottom of subsiding sections while managing system complexity through functional specialization
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
This method allows for accurate and thorough trenchless repair of small-diameter concrete drainage pipelines by injecting polymer materials directly to the subsiding sections, effectively uplifting and stabilizing the pipeline without the need for trenching, thus preventing leakage and environmental pollution.
Implementation Method 1
injecting a polymer material to the bottom of the subsiding pipeline section through the grouting pipe, so as to uplift and reset the subsiding pipeline section
Data Source
AI summary
Trenchless methods for forming a curved hole channel with a steel sleeve and pipeline lifting are provided, including steps of: (T1) drilling a straight hole channel, and inserting the steel sleeve into the straight hole channel; (T2) inserting a guiding pipe into the steel sleeve, and determining a bending direction of a hole channel to be formed; and (T3) inserting a flexible steel-wire pipe into the guiding pipe, and punching to form the curved hole channel. With applying the creative trenchless method for forming the curved hole channel, a specially-made grouting pipe is accurately inserted to a bottom of a subsiding pipeline section, so that a polymer material is conveniently injected to a bottom of a disease position. Though utilizing an expansion force generated by the polymer material, the subsiding pipeline section is uplifted, so as to realize trenchless repairing.