External Reinforcement Kit for Self-Drilling Micropiles
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Solution Overview
Problem
Existing micropiling techniques, including self-drilling micropiles, often fail to meet the demand for sufficient shear resistance and horizontal limit load, especially under seismic load conditions, due to the small size and thickness of the reinforcement pipes.
Innovation Solution
A reinforcement kit is developed that can be coupled externally to self-drilling hollow bars, comprising a reinforcing tubular body that is screwed onto the self-drilling micropile, increasing the section and shear resistance of the micropile only where needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the diameter and thickness of the reinforcing pipe are increased to improve shear resistance, then the bearing capacity and shear strength are improved, but the installation complexity and cost increase
Solution Approach 1:
The reinforcing pipe is divided into two separate components: the original self-drilling hollow bar and an external reinforcing tubular body. These segments are assembled together through screw connections, allowing the structure to achieve high shear resistance without requiring a single large-diameter pipe that would be difficult to install. The segmentation enables modular installation and simplifies the overall installation process.
Solution Approach 2:
The reinforcing tubular body is nested externally around the self-drilling hollow bar, creating a composite structure. This nested configuration allows the reinforcing body to provide additional shear resistance while maintaining the compact size and installability of the original hollow bar. The external reinforcement wraps around the core element, delivering enhanced strength without increasing installation complexity.
2Strength
If larger diameter bars are used to increase shear strength, then the bearing capacity is improved, but the installation complexity and costs increase
Solution Approach 1:
The reinforcement function is segmented from the drilling function. The self-drilling hollow bar handles the drilling and anchoring functions, while the external reinforcing tubular body provides the additional shear strength. This segmentation allows each component to be optimized for its specific function, maintaining installability while achieving the required structural performance.
Solution Approach 2:
The invention creates a composite reinforcement system combining two different structural elements: the self-drilling hollow bar with external threading and the reinforcing tubular body. This composite structure delivers the shear strength of a larger diameter bar while maintaining the installation advantages of the original smaller hollow bar, as the two components are assembled through simple screw connections.
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
The reinforcement kit effectively increases the shear strength of self-drilling micropiles in specific sections, enhancing their ability to withstand seismic loads without the need for larger diameter bars, thus reducing installation complexity and costs.
Implementation Method 1
screw means configured to be screwed on the outside of the self-drilling micropile and tighten the reinforcing tubular body between them to constrain it in the desired position with respect to the self-drilling micropile
Implementation Method 2
A reinforcement kit is developed that can be coupled externally to self-drilling hollow bars, comprising a reinforcing tubular body that is screwed onto the self-drilling micropile, increasing the section and shear resistance of the micropile only where needed
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A reinforcement kit (1; 100) that can be coupled to self-drilling micropiles (2) provided with a continuous outer thread (3) and configured to be driven into a soil (T) to be consolidated. The reinforcement kit (1; 100) comprises a reinforcing tubular body (4) configured to be arranged coaxially on the outside of a self-drilling micropile (2) and screw means (5; 105) that are configured to be screwed on the outside of the self-drilling micropile (2) to tighten the reinforcing tubular body (4) between them and to restrain it in the desired position along the self-drilling micropile (2). In the reinforcing tubular body (4) a plurality of holes (7) passing through the thickness of its side wall (4e) are present.