Hybrid Foundation Structure With Variable Cross-Section
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Solution Overview
Problem
Conventional piles have inefficient bearing capacity due to constant cross-sections regardless of depth and overload boring equipment, especially in soils with varying bearing capacities and deep depths.
Innovation Solution
A hybrid foundation structure with varying cross-sectional support layers formed from solidified soil, comprising an upper support layer and a narrower lower support layer, using a mixture of earth, sand, and a soil-solidifying agent, with optional steel or concrete core, to adapt to different soil layers and reduce boring hole diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional piles with constant cross-section are used regardless of depth, then construction is simple, but bearing capacity efficiency is poor due to mismatch with varying soil layers
Solution Approach 1:
The pile structure is divided into multiple segments with different cross-sectional dimensions corresponding to different depth ranges. Each segment is designed to match the bearing capacity characteristics of the soil layer at that depth, optimizing load transfer efficiency while maintaining construction feasibility through standardized segmental construction processes
Solution Approach 2:
The pile structure implements variable cross-sectional dimensions at different depths, with larger cross-sections at shallow depths where soil bearing capacity is lower, and smaller cross-sections at greater depths where soil bearing capacity is higher. This local adaptation of structural properties to matching soil conditions optimizes overall bearing capacity efficiency
2Strength
If boring hole diameter is maintained at same size for deep depths, then pile cross-section consistency is achieved, but boring equipment becomes overloaded
Solution Approach 1:
The boring hole diameter is dynamically adjusted according to depth, transitioning from larger diameters at shallow depths to smaller diameters at greater depths. This dynamic adjustment allows the boring equipment to operate within safe load limits throughout the drilling process while still achieving the required pile bearing capacity through the variable cross-sectional design
3Strength
If variable cross-section piles are constructed to match soil layers, then bearing capacity efficiency improves, but construction complexity increases
Solution Approach 1:
The variable cross-section pile is constructed by segmenting the boring process into multiple depth stages, each with standardized boring and grouting operations. This segmentation allows the complex variable cross-section design to be implemented using repeated, standardized construction procedures, reducing the actual construction complexity despite the variable geometry
Solution Approach 2:
The pile construction utilizes parameter changes in boring hole diameter and grouting pressure according to depth. By systematically varying these construction parameters to match the desired variable cross-section profile, the complex geometric design is achieved through controlled parameter adjustments rather than complex construction procedures
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 ground subsidence, reduces equipment overload, and allows for efficient reinforcement of soft ground with cost-effective use of field-generated soil, achieving stable structural stability and fast solidification.
Implementation Method 1
a mixture of earth, sand, and a soil-solidifying agent is injected into the boring hole 1 for forming the upper support layer 10 and the lower support layer 20
Data Source
AI summary
The present invention relates to a foundation structure vertically installed on the ground, and comprising: an upper support layer 10 formed on the ground in the vertical direction; and a lower support layer 20 formed so as to extend downward from the upper support layer 10 and such that the width thereof is less than that of the upper support layer 10. The disclosed upper support layer 10 and the lower support layer 20 are structures formed from soil solidified by means of feeding and mixing an earth and soil-solidifying agent therein, and therefore are efficient and prevent overload due to boring equipment.