Compression Element for Pile Skin Friction Activation
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Solution Overview
Problem
In deep foundation structures, especially in unyielding soils, the lack of skin friction resistance limits the load-bearing capacity, requiring more piles or larger diameters, as skin friction is not mobilized due to minimal settlement, and high rock strength often prevents sufficient settlement for skin friction activation.
Innovation Solution
A device with a compression element that reduces height under compressive force, allowing controlled settlement of pile-like support members to activate skin friction, comprising an upper and lower part with a compression element that closes the gap, using materials like elastomers or concrete with plastic components to achieve predictable settlement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pile-like support members are founded in inflexible soils/hard rock, then tip resistance can be mobilized, but skin friction cannot be activated due to lack of settlement
Solution Approach 1:
The device performs preliminary settlement of the pile-like support member before full load bearing is required. By pre-compressing the compression element to a predetermined settlement amount, the pile is positioned to activate skin friction resistance in advance, ensuring both tip resistance and skin friction can contribute to load bearing capacity.
Solution Approach 2:
The device changes the settlement parameter of the pile-like support member by controlling the compression of the compression element. This controlled parameter change enables the pile to settle by a predetermined amount, thereby activating skin friction resistance that would otherwise remain dormant in inflexible soils.
2Strength
If higher rock strength is present, then tip resistance increases, but settlement is prevented and skin friction remains unmobilized
Solution Approach 1:
The device performs preliminary settlement of the pile-like support member before full load bearing is required. By pre-compressing the compression element to a predetermined settlement amount, the pile is positioned to activate skin friction resistance in advance, ensuring both tip resistance and skin friction can contribute to load bearing capacity.
Solution Approach 2:
The compression element acts as an intermediary mechanism between the applied load and the pile-like support member. It mediates the settlement process by compressing in a controlled manner to achieve the predetermined settlement amount, enabling skin friction activation without compromising the high tip resistance provided by strong rock conditions.
3Strength
If more piles or larger diameters are used, then load-bearing capacity increases, but material usage and construction time increase
Solution Approach 1:
The device changes the settlement parameter of the pile-like support member by controlling the compression of the compression element. This controlled parameter change enables the pile to settle by a predetermined amount, thereby activating skin friction resistance that would otherwise remain dormant in inflexible soils.
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
Activates skin friction, increasing overall resistance, reducing the number and size of piles needed, saving material and construction time while maintaining peak resistance, by enabling controlled settlement and mobilization of skin friction resistance.
Implementation Method 1
The at least one compression element is designed to be compressed in a controlled manner under a predetermined load by the compressive force, thereby reducing the height of the device
Implementation Method 2
The at least one compression element is arranged between the upper and lower parts such that it acts as a spacer to form a gap between them
Data Source
Figure 1
Figure 2
Figure 3A~3D
AI summary
The present invention relates to a device for activating the skin friction of pile-like load-bearing elements founded in bedrock. The device comprises a mechanism designed to reduce the height of the device when subjected to a compressive force. This compressive force causes controlled settlement of the pile-like load-bearing element in the ground, sufficient to activate the skin friction of the pile-like load-bearing element. The invention further relates to pile-like load-bearing elements and structures incorporating such a device, as well as a method for activating the skin friction of pile-like load-bearing elements and a method for constructing such a structure.