Hybrid Foundation Structure With Variable Cross-Section Piles
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Solution Overview
Problem
Conventional foundation structures face inefficiencies due to constant cross-sections regardless of soil bearing capacity variations with depth and overload issues in boring equipment, especially in deep depths where different soil layers have varying bearing capacities.
Innovation Solution
A hybrid foundation structure with upper and lower support layers of varying cross-sectional sizes, formed from solidified soil mixtures, where the lower support layer extends deeper with a narrower width, and a steel or concrete core can be inserted, allowing for customized depth and load distribution, reducing equipment overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional piles with constant cross-section are used, then construction is simple, but they are not efficient because ground bearing capacity varies with depth
Solution Approach 1:
The pile is divided into multiple sections along its length, with each section having a different cross-sectional area. The upper portion has a larger cross-section while the lower portion has a smaller cross-section, allowing each segment to be optimized for the specific soil conditions at that depth.
Solution Approach 2:
Different portions of the pile are given different cross-sectional dimensions to match the varying bearing capacity of soil at different depths. The larger upper section corresponds to weaker soil layers requiring more support, while the smaller lower section corresponds to stronger soil layers.
2Device complexity
If boring holes are formed with the same diameter at all depths, then the structure is simple, but boring equipment is overloaded in deep depths
Solution Approach 1:
The boring process is divided into multiple stages, with each stage creating a hole of appropriate diameter for that depth range. Smaller diameter holes are created at greater depths where less material support is needed, reducing the load on boring equipment.
3Productivity
If piles with varying cross-sections are used, then ground reinforcement efficiency improves, but construction complexity increases
Solution Approach 1:
The construction process uses nested drilling where smaller diameter holes are drilled within or alongside larger diameter holes at different depth levels. This allows the varying cross-section pile to be constructed through sequential drilling and grouting operations.
Solution Approach 2:
The boring holes are formed in advance before pile construction, with the hole diameters pre-determined based on the required pile cross-section at each depth. This preliminary boring action simplifies the subsequent pile installation process.
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 approach enhances bearing capacity, prevents subsidence, and reduces material usage and equipment overload by adapting to varying soil conditions, offering cost-effective and efficient ground reinforcement.
Implementation Method 1
formed from solidified soil which is the mixture of earth, sand, and a soil-solidifying agent
Data Source
AI summary
A hybrid foundation structure includes a first perforation hole formed in the ground, at least one second perforation hole formed adjacent to the first perforation hole on a side surface of the first perforation hole, and a first pile and a second pile formed by mixing and injecting soil and soil solidifying agent into the first perforation hole and the second perforation hole.