Driven Pile Undercut for High Tensile Force Connection
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Solution Overview
Problem
Existing driven piles face challenges in achieving high tensile forces without additional components, as the initial joining force applied during ramming is not adequately sustained, leading to potential cracking and stability issues when trying to increase tensile strength.
Innovation Solution
The introduction of an undercut at the second end of the driven pile, which allows for a form-fitting connection with the previously driven pile, enabling the absorption of high tensile forces without the need for additional components like expansion elements, by deforming the pile in a crack-free manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If additional components like expansion elements are introduced to increase tensile force, then the tensile force absorption capacity is improved, but the device complexity and risk of cracking increase
Solution Approach 1:
The pile structure is segmented into modular units that can be connected through the undercut mechanism. Each pile segment maintains structural integrity while enabling high-tensile-force connections without requiring additional expansion elements or complex joining components within each segment.
Solution Approach 2:
Instead of expanding elements outward to increase tensile force (conventional approach), the invention inverts the approach by creating an inward-facing undercut geometry that mechanically interlocks the pile tip with the previous pile segment, achieving high tensile force absorption without external expansion components.
2Ease of manufacture
If the shaft wall thickness is reduced to facilitate deformation, then the ease of manufacture and deformation capability are improved, but the structural strength may be compromised
Solution Approach 1:
The shaft exhibits local quality variation with reduced wall thickness specifically in the deformation zone to enable controlled plastic deformation during undercut formation, while maintaining adequate wall thickness in other regions to preserve overall structural strength and load-bearing capacity.
Solution Approach 2:
The wall thickness parameter is optimized to enable sufficient plastic deformation capability for forming the undercut geometry while maintaining structural integrity. The material and geometric parameters are selected to ensure the deformation process creates the desired interlocking shape without compromising the pile's load-bearing capacity.
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 enhances the tensile force absorption capacity of interconnected driven piles significantly, ensuring stability and preventing cracking, while eliminating the need for additional components.
Implementation Method 1
the shank 2 is deformed and not the area of the sleeve 3... the shank 2 has to adapt to the contour of the undercut 8 in the area of the latter. This takes place along the insertion depth T. This results in a very careful, even deformation of a round cross section into a cross section with several or even just one undercut 8
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3c
AI summary
A driven pile (1) with a substantially cylindrical shaft (2), wherein the shaft (2) forms a first pile end (1a) and a second pile end (1b), wherein a socket (3) is arranged on the driven pile (1) in the region of the second pile end (1b), wherein the socket (3) or the driven pile (1) has a stop (9) in the region of the second pile end (1b), such that a further driven pile (1) with a first pile end (1a) can be inserted up to a maximum insertion depth (T) defined by the stop (9), wherein the socket (3) and/or the driven pile (1) forms at least one undercut (8) in the region of the second pile end (1b) extending at least substantially to the stop (9).