Jet Grouting Tool Angular Positioning for Gusset Elimination
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Solution Overview
Problem
Existing jet grouting methods often leave unblasted areas between jet grouting bodies, known as 'gussets,' which reduce the bond between adjacent bodies and compromise tightness, especially when sealing against groundwater pressure.
Innovation Solution
A method and device utilizing at least two jet grouting tools with adjustable depth and angular position control, where the outlet nozzles are aligned to simultaneously inject grout into the soil between the tools, enhancing pore water pressures and erosion performance to minimize gussets and improve bond tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional jet grouting methods are used with separate tool operation, then the process is simpler to implement, but unblasted areas (gussets) remain between jet grouting bodies reducing bond tightness
Solution Approach 1:
The patent combines two jet grouting tools into a coupled operating system where the tools work simultaneously with coordinated angular positions. The outlet nozzles of both tools are regulated to simultaneously target the same soil area, merging their erosion effects to eliminate gussets and ensure complete blasting coverage between adjacent jet grouting bodies.
Solution Approach 2:
The system implements angular position regulation that monitors and adjusts the orientation of each tool's outlet nozzle to ensure they simultaneously target the same area. This feedback mechanism maintains precise coordination between the two tools, ensuring consistent overlapping erosion zones and eliminating unblasted gusset areas.
2Productivity
If tool center distance is increased to reduce the number of bodies, then production efficiency improves, but gusset areas increase reducing bond quality
Solution Approach 1:
By combining the erosion effects of two simultaneously operating jet grouting tools with regulated angular positions, the system achieves complete soil blasting even at increased tool center distances. The merged erosion zones from both tools eliminate gussets while allowing greater spacing between tool centers, thereby improving productivity without sacrificing bond quality.
3Manufacturing precision
If angular position regulation is implemented to target the same area simultaneously, then erosion performance and bond tightness improve, but the system becomes more complex
Solution Approach 1:
The angular position regulation system uses feedback control to monitor and adjust the orientation of each tool's outlet nozzle, ensuring they simultaneously target the same soil area. This precise feedback mechanism achieves superior erosion performance and complete gusset elimination while maintaining automated control that manages the increased system complexity.
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 approach achieves higher erosion performance and tighter bond between jet grouting bodies, allowing for greater coverage or increased distance between tools while maintaining sealing integrity, thus reducing the need for additional jet grouting bodies and lowering production costs.
Implementation Method 1
the soil in the area of the borehole is cut open or eroded with the help of a jet of water or cement suspension
Implementation Method 2
By simultaneously injecting the grout into the soil area between the two nozzle tools, higher excess pore water pressures and greater water saturation are achieved here
Data Source
Figure 1~2
Figure 3a~3d
Figure 4a~4b
AI summary
The method involves adjusting depth (T) of jet tools (8, 9) such that exhaust nozzles of the respective jet tools lie in a plane that is perpendicular to longitudinal axes of the jet tools. The jet tools are rotated around the respective longitudinal axes for applying injection medium into ground based on the depth of the jet tools. Angle position of one of the jet tools is controlled such that the exhaust nozzles of the respective jet tools are aligned simultaneously on an area of the ground, where the area lies between the jet tools. An independent claim is also included for a device for producing parallel ground bodies.