Jet Grouting Equipment Through Clamp and Sensor Control
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Solution Overview
Problem
Current jet grouting systems face challenges in achieving accurate and deep non-circular columnar consolidations due to limitations in the transfer of rotational movements between the rotary head and rods, particularly when using mast extensions, leading to inefficiencies and potential structural integrity issues in elongated soil columns.
Innovation Solution
The implementation of a through clamp system that securely transfers rotational motion from the rotary head to the rods via a clamping mechanism with adjustable wedges and a sensor system to accurately control the angular position of the rods, allowing for precise directional control of the consolidating jet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If mast extensions are used to increase treatment depth, then the depth of jet grouting is improved, but the reliability of rotational motion transfer deteriorates due to angular sliding between rotary and rod
Solution Approach 1:
A sensor system acts as an intermediary between the rotary head and rods to detect and correct angular position deviations. The sensor mounted on the rotary head monitors the angular position of the rods and provides feedback signals to adjust the rotational motion, ensuring reliable torque transmission even when rods pass through the rotary via locking means rather than direct connection.
Solution Approach 2:
The system implements feedback control by using the sensor to continuously monitor the angular position of the rods during rotation. When angular sliding occurs between the rotary and rods, the sensor detects the position error and generates signals to correct the rotational alignment, maintaining reliable motion transfer throughout the extended mast length.
2Length of moving object
If rods are passed through the rotary with locking means, then the depth capability is improved, but the manufacturing precision of non-circular columns deteriorates due to angular position variability
Solution Approach 1:
The sensor system serves as an intermediary that continuously monitors the angular position of the rods and provides real-time feedback to the control system. This enables precise control of the consolidating jet direction even when rods are transmitted through the rotary with locking means, maintaining the accuracy of non-circular column formation.
Solution Approach 2:
The patent replaces purely mechanical angular position control with a sensor-based detection and electronic control system. Instead of relying solely on mechanical locking means to maintain angular position, the system uses optical or electromagnetic sensors to detect rod position and electronically controls the rotational motion, achieving higher precision in column shape formation.
3Length of moving object
If multiple restarts are performed to reach designated depths, then the treatment depth is improved, but the productivity deteriorates due to repeated locking and unlocking operations
Solution Approach 1:
The sensor system enables continuous monitoring and adjustment of rod angular position during the entire drilling and grouting operation. This continuous control reduces the need for repeated stopping, locking, and unlocking operations, allowing the rotary head to maintain rotation and perform multiple injection cycles without interrupting the useful action, thereby improving productivity.
Solution Approach 2:
The real-time feedback from the sensor allows the control system to maintain optimal operational parameters during continuous operation. By detecting angular position deviations and making immediate corrections, the system avoids repeated interruptions for manual intervention, enabling smoother and more efficient multi-stage drilling operations to reach greater depths.
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 solution enables more accurate and deeper non-circular columnar consolidations, reducing material usage and operational costs by ensuring precise alignment and penetration of elongated soil columns, thereby enhancing the structural integrity and impermeability of underground structures.
Implementation Method 1
a sensor system to accurately control the angular position of the rods
Implementation Method 2
a clamping mechanism with adjustable wedges
Implementation Method 3
a clamping mechanism with adjustable wedges
Data Source
AI summary
Equipment serves to form consolidated soil columns having a non-circular cross-section, and includes a mast (2, 8), a rotary (3) which is rotatable and translatable along an axis parallel to the mast, a series of hollow rods (4) temporarily unlockable from the rotary (3), and a device to vary the rotational rate of the rotary in one or more prefixed angular ranges. A rotor (21) is directly secured to one of the rods of the string and operatively coupled to a device (20) generating control signals to vary the rotational speed of the rotary in response to the rotor angular position. A through clamp (10) is mounted to the rotatable mandrel of the rotary and is provided with locking members which can be activated to clamp a rod and make it integral to the rotary, and which can be deactivated to release the rod so as to allow the rotary to move relative to the rod.