Deployable Mixer Bulb Ground Anchor for Soft Earth Bonding
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Solution Overview
Problem
Conventional anchoring tie-rod bonding methods in soft earth do not enable sufficient force transmission for effective anchoring due to inadequate bonding capacity.
Innovation Solution
A method involving a deployable mixer device in a boring tool that forms a bulb in the ground by mechanical in-situ mixing with a fluid, creating a larger bonded portion for improved anchoring, combined with a reinforcement inserted into the bulb, enhancing bonding capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional bonding methods are used for anchoring tie-rods in soft earth, then the structure can be anchored, but the bonding capacity is insufficient to transmit sufficient forces
Solution Approach 1:
The anchoring system is divided into distinct segments: a top portion with smaller diameter and a bulb portion with larger diameter. This segmentation allows each portion to serve different functions - the top portion provides structural continuity while the bulb portion provides enhanced bonding capacity through increased surface area contact with the surrounding ground.
Solution Approach 2:
The anchor rod has non-uniform geometry with different diameters in different portions. The bulb portion has a larger diameter specifically at the location where bonding with ground is required, while the top portion maintains a smaller diameter for structural integration. This local variation in geometry optimizes the bonding capacity at the critical interface with the ground.
2Strength
If the diameter of the anchor rod is increased to improve bonding capacity, then more force can be transmitted, but the complexity of the device increases
Solution Approach 1:
The anchor rod features a dynamic transition in geometry from a uniform cross-section to a bulbous expansion. This dynamic change in shape allows the structure to adapt its form to optimize bonding at the ground interface while maintaining simplicity in the upper portion that integrates with the structure. The bulb formation creates additional bonding surface area without requiring the entire rod to have increased diameter.
3Strength
If a deployable mixer device is used to form a bulb in the ground, then bonding capacity is significantly improved, but the complexity of the construction process increases
Solution Approach 1:
The mixer device is deployed only in the specific region where the bulb needs to be formed, rather than being used throughout the entire anchoring process. This partial deployment approach allows the bulb portion to be created with enhanced bonding characteristics only where needed, while the top portion is installed using conventional methods, thereby limiting the increase in construction complexity to only the necessary portion.
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
Significantly improves bonding capacity and friction between the anchor and ground, allowing for more effective force transmission and anchoring in soft earth conditions.
Implementation Method 1
the boring tool is driven in rotation with the mixer device in the deployed position while moving the boring tool axially along the boring axis and while injecting the fluid so as to perform mechanical in-situ mixing of the ground in place with the fluid
Implementation Method 2
the fluid is a binder, such that the bulb comprises a first material forming a mixture constituted by the ground in place mixed with the binder
Implementation Method 3
a bonded portion whereby the traction force is transmitted to the surrounding terrain
Data Source
AI summary
The invention provides a method of constructing a ground anchor, wherein the method comprises performing an introduction step for introducing the boring tool into the ground along a boring axis (F) so as to form a top portion (C1), the mixer device being in the retracted position during the introduction step; then performing a mixing step during which the mixer device is taken to the deployed position and the boring tool is driven in rotation with the mixer device (14) in the deployed position while moving the boring tool axially along the boring axis and while injecting the fluid so as to perform mechanical in-situ mixing of the ground in place with the fluid, thereby forming a bulb (B) in the ground under the top portion (C1), which bulb has a second diameter (D2) that is greater than the first diameter (D1); inserting a reinforcement into the bulb, whereby a ground anchor is obtained.