Seismic Retrofitting Grout Injection Control Chart Device
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Solution Overview
Problem
The existing compaction grouting system (C.G.S) construction method faces challenges in forming uniform grout pillars in difficult ground conditions, lacks real-time injection status monitoring, and relies heavily on operator experience for quality control, making it difficult to prevent ground crushing and ensure construction quality.
Innovation Solution
A device comprising a pump unit for injecting grout at predetermined quantities and pressures, a sensor unit for measuring discharge pressure, and a monitoring unit that outputs injection control charts, allowing for real-time adjustments and notifications to maintain uniform grout pillar formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If C.G.S construction method uses low flowable material to form consolidated body, then the consolidated body can be formed and injection material stays at planned location, but the injection status cannot be checked with naked eye and ground crushing phenomenon cannot be prevented
Solution Approach 1:
The patent introduces a monitoring system that measures injection pressure and volume in real-time during grout injection, providing feedback information about the injection status. This allows operators to detect ground crushing phenomena and adjust injection parameters accordingly, resolving the contradiction between forming precise consolidated bodies and obtaining injection status information.
Solution Approach 2:
The patent uses pressure sensors and monitoring devices as intermediaries to indirectly observe the injection status. Since the injection material itself cannot be directly observed, these intermediary measurement tools provide information about pressure changes and injection volumes, enabling detection of ground conditions without direct visual inspection.
2Ease of operation
If construction quality control depends on operator experience value, then flexible decision making is possible, but construction completion criteria cannot be objectively determined
Solution Approach 1:
The monitoring system provides objective feedback data on injection pressure and volume, allowing operators to make informed decisions based on measured parameters rather than subjective experience alone. This combines the flexibility of operator judgment with objective measurement criteria.
Solution Approach 2:
The patent establishes specific parameter thresholds (injection pressure, injection volume, rate of pressure change) that serve as objective completion criteria. These parameter-based criteria provide measurable standards for construction completion while allowing operational flexibility within the parameter ranges.
3Productivity
If grout injection is performed at high pressure to ensure penetration, then injection efficiency is improved, but ground crushing phenomenon occurs
Solution Approach 1:
The monitoring system continuously measures injection pressure and detects abnormal pressure increases that indicate ground crushing. When crushing is detected, the system provides feedback to reduce injection pressure, maintaining efficient injection while preventing ground damage.
Solution Approach 2:
The patent implements dynamic adjustment of injection pressure based on real-time monitoring conditions. Rather than using fixed high pressure, the injection pressure is dynamically modified according to ground response, allowing efficient penetration when appropriate while preventing crushing when resistance becomes excessive.
Data Source
AI summary
A device for obtaining C.G.S injection control chart for seismic retrofitting and controlling quality includes a pump unit which injects a grout into the ground in predetermined quantities per unit time at an injection pressure that is a predetermined static pressure; a sensor unit which measures a discharge pressure which is a pressure at which the grout injected into the ground through the pump unit is discharged from the pump unit; and a monitoring unit which calculates injection control charts for each depth on the basis of injection quantities per unit time of the grout being supplied by the pump unit, and the discharge pressure measured by the sensor unit.