Compaction Grouting Injection Pipe with Real-Time Pressure Feedback
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Solution Overview
Problem
The compaction grouting system (C.G.S) construction method faces challenges in forming a uniform grout pillar in difficult ground conditions, lacking real-time injection state monitoring and quality control, leading to ground crushing and incomplete construction due to operator-dependent quantitative injection and quality control.
Innovation Solution
A method involving an injection pipe for grout injection with pressure monitoring and adjustment, adjusting injection pressure and time based on discharge pressure changes, and changing injection pipe depth to ensure uniform grout distribution, with injection rates limited to ground permeability to prevent fracturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If operator experience-based quantitative injection and quality control are used, then construction flexibility is maintained, but manufacturing precision and reliability of grout pillar formation deteriorate
Solution Approach 1:
The patent implements real-time feedback control by measuring discharge pressure during grout injection and using this data to automatically adjust injection parameters. The system continuously monitors injection conditions and provides feedback to the control unit, which adjusts injection pressure and rate to maintain optimal injection conditions and ensure uniform grout pillar formation, eliminating dependence on operator experience.
Solution Approach 2:
The patent replaces the mechanical/operator-based quality control system with an automated electronic control system. The control unit receives discharge pressure measurements and automatically adjusts injection parameters without human intervention, substituting operator experience with automated sensing and control mechanisms to achieve consistent manufacturing precision.
2Productivity
If high injection pressure is used to ensure grout penetration, then injection effectiveness improves, but ground crushing and harmful factors increase
Solution Approach 1:
The patent employs dynamic injection pressure adjustment based on real-time discharge pressure measurements. Instead of using constant high pressure, the system continuously adapts injection parameters to actual ground conditions, increasing pressure only when necessary for penetration while reducing it when ground resistance is low, thereby preventing ground crushing while maintaining injection effectiveness.
Solution Approach 2:
The patent changes injection parameters (pressure and rate) dynamically during the injection process based on measured discharge pressure values. The control unit adjusts these parameters to maintain optimal injection conditions, ensuring sufficient grout penetration into difficult ground conditions while avoiding excessive pressure that would cause ground crushing or fracturing.
3Manufacturing precision
If real-time pressure monitoring and automatic adjustment systems are implemented, then manufacturing precision and quality control improve, but device complexity increases
Solution Approach 1:
The patent implements a feedback control system where a pressure sensor measures discharge pressure in real-time and transmits this data to a control unit. The control unit automatically adjusts injection parameters based on this feedback, creating a closed-loop control system that improves manufacturing precision while keeping the system architecture relatively simple and straightforward.
4Productivity
If injection rate is increased to improve construction speed, then productivity improves, but injection quality and ground condition adaptability deteriorate
Solution Approach 1:
The patent uses dynamic adjustment of injection rate based on real-time discharge pressure measurements. The control unit modifies injection parameters continuously during the process, increasing rate when ground conditions allow for faster injection while maintaining quality, and reducing rate when ground resistance increases, thereby achieving both productivity improvement and quality maintenance.
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 the formation of a uniform grout pillar, allowing real-time monitoring and optimization of injection conditions, preventing ground crushing and ensuring construction quality by adapting to varying soil conditions.
Implementation Method 1
injecting the grout into the ground through the injection pipe inserted in the injection pipe inserting step, the grout being injected in predetermined quantities per unit time under an injection pressure that is a predetermined static pressure
Implementation Method 2
a pressure measuring step for measuring discharge pressure which is a discharge pressure of the grout injected in the injecting step
Implementation Method 3
an injection adjusting step for adjusting, depending on a change in measurement value of the discharge pressure measured in the pressure measuring step, at least one or more among the injection pressure of the grout in the injecting step, and the unit time at which predetermined quantities of the grout are injected
Data Source
AI summary
A compaction grouting system (“C.G.S”) construction method capable of seismic retrofit and quality control is provided. An injection pipe is inserted in the ground to an insertion depth and is provided for injecting a grout into the ground at the insertion depth. The grout is injected in predetermined quantities per unit time under an injection pressure that is a predetermined static pressure. A discharge pressure of the grout being injected is measured. At least one or more, among the injection pressure at which the grout is being injected and the unit time per which predetermined quantities of the grout are injected, is adjusted, according to the change in the measurement value of the discharge pressure. The insertion depth at which the injection pipe is inserted in the ground is changed after the injection of the grout is completed.