Segmented Driven Pile with Enlarged Foot for Mixed Soil Anchoring
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Solution Overview
Problem
Existing methods for driving and anchoring driven piles in multi-layered soils with alternating cohesive and non-cohesive layers are inefficient, requiring long piles and high costs, as vibrating methods fail in cohesive layers and ramming is challenging in mixed soil structures.
Innovation Solution
A method involving a driven pile with a larger cross-section at the pile foot, driven by ramming impulses and injected with a hardenable material under high pressure through a conveying line, allowing anchoring in both cohesive and non-cohesive soils by creating a gap for the material to fill, achieving stability in mixed-layer structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If vibration methods are used to drive piles into non-cohesive soils, then the pile installation is easier and faster, but the method fails completely in cohesive soil layers
Solution Approach 1:
The driven pile is divided into two distinct cross-sectional portions: a first portion with a larger cross-section for penetrating cohesive soil layers, and a second portion with a smaller cross-section for optimal anchoring in non-cohesive soil layers. This segmentation allows the pile to adapt to different soil types along its length, combining the advantages of both vibration and ramming methods.
Solution Approach 2:
Different portions of the pile are given different cross-sectional dimensions tailored to the specific requirements of the soil layers they will encounter. The first portion has a larger cross-section specifically for cohesive soil penetration, while the second portion has a smaller cross-section optimized for anchoring in non-cohesive soils, creating local quality variations that solve the soil adaptability problem.
2Strength
If long driven piles are used to achieve sufficient stability in multi-layered soils, then the load capacity increases, but the handling and installation complexity and cost increase significantly
Solution Approach 1:
The pile design incorporates a dynamic transition in cross-sectional dimensions along its length, with the first portion having a larger cross-section for penetrating resistant cohesive layers and the second portion having a smaller cross-section for anchoring. This dynamic variation in geometry allows the pile to achieve sufficient load capacity without requiring excessive length, thereby reducing handling and installation complexity.
3Strength
If a larger cross-section is used at the pile foot for penetrating cohesive soils, then the penetration capability improves, but the anchoring effectiveness in non-cohesive soils may be reduced
Solution Approach 1:
The pile is segmented into two functional zones: the first portion with larger cross-section dedicated to penetrating cohesive soil layers, and the second portion with smaller cross-section dedicated to anchoring in non-cohesive soils. This segmentation ensures that each portion is optimized for its specific function, with the transition zone allowing the pile to achieve both penetration and anchoring objectives.
Solution Approach 2:
The pile exhibits local quality variations in its cross-sectional dimensions, with the first portion having a larger cross-section specifically where cohesive soil penetration is required, and the second portion having a smaller cross-section where anchoring in non-cohesive soils is needed. This localized optimization resolves the contradiction between penetration capability and anchoring effectiveness.
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 method enables driven piles to achieve load capacities of up to 8,000 kN (800t) in difficult soils, allowing for efficient anchoring in both cohesive and non-cohesive layers, and can be used for vertical or angled piles, reducing the complexity and cost of pile installation.
Implementation Method 1
the hardening material, in particular the concrete, serves to penetrate into gaps that have been shaken open and thus to anchor the driven pile in the subsoil
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The method involves driving a driven pile (1) with a cross-section enlarged in the area of the pile foot (4) against the cross-section of the remaining driven pile by applying the piling impulses acting in its longitudinal direction on the pile head with the pile foot preceding into the ground. The suspension of a curable material is pressed up to the pile foot in the area at the same time in which the cross-section against the area of enlarged cross-section is tapered in the direction of the pile head by a line extending to the driven pile. Independent claims are included for the following: (1) a driven pile with a pile body formed of an H-profile; and (2) a system with a driven pile, a pile driver and a suspension pressure pump.