Extensible Shell Support Piers for Soft Clay Load Reinforcement
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Solution Overview
Problem
Existing shallow foundations are limited by load-bearing capacity in soft clay soil, and prior art metal shells are not extensible, corrosive, and unsuitable for containing granular materials, leading to inadequate support for structures.
Innovation Solution
An extensible shell made of non-corrosive material that expands laterally to contain compacted granular construction material, allowing for improved load-bearing capacity and soil reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal shells are used for driving and forming concrete piles, then the piles can be formed with structural load support, but the shells are subject to corrosion and cannot laterally contain granular infill materials
Solution Approach 1:
The patent uses flexible plastic shells instead of rigid metal shells. The plastic material provides corrosion resistance while the flexibility allows lateral deformation to contain granular materials like sand or aggregate. The shell expands laterally during compaction to engage surrounding soil and maintains containment throughout the pier's life.
Solution Approach 2:
The invention combines plastic shell material with granular infill materials (sand, aggregate, or cementitious material) to create a composite pier structure. The plastic provides corrosion resistance and flexibility, while the granular material provides load-bearing capacity, achieving both durability and structural support.
2Strength
If prior art metal shells are used, then concrete piles can be formed, but the shells are not extensible and cannot engage surrounding soil through lateral deformations
Solution Approach 1:
The patent employs a dynamic shell design that transitions from a rigid metal shell to a flexible plastic shell capable of lateral deformation. The shell dynamically adapts during installation and service by expanding laterally to engage surrounding soil, providing both structural integrity and soil interaction.
Solution Approach 2:
The invention changes the material parameter from metal to plastic, fundamentally altering the shell's mechanical properties. This parameter change enables extensibility and lateral deformation capability while maintaining sufficient structural strength for load support.
3Ease of manufacture
If shallow foundations are used, then construction cost is reduced, but load-bearing capacity is insufficient in soft clay soil
Solution Approach 1:
The flexible plastic shell creates a deep foundation structure that can be installed relatively easily compared to traditional deep foundations. The shell's ability to laterally engage soft clay soil through deformation provides enhanced load-bearing capacity while maintaining cost-effectiveness through simplified installation procedures.
Solution Approach 2:
The composite structure of plastic shell plus granular infill creates a deep foundation with superior load-bearing capacity in soft soils. The combination leverages the corrosion resistance and flexibility of plastic with the high strength of compacted granular materials, achieving both technical performance and economic efficiency.
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
The extensible shell provides a 3.5 to 5.3-fold improvement in load carrying capacity compared to traditional aggregate piers, enhancing soil strength and stability.
Implementation Method 1
the shell is flexible such that the shell expands laterally outward when granular construction material is compacted in the interior of the shell
Implementation Method 2
the pier can deform elasto-plastically without rupture
Data Source
Figure 1A~1C
Figure 1D~1E
Figure 2A~2B
AI summary
Extensible shells and related methods for constructing a support pier are disclosed. An extensible shell can define an interior for holding granular construction material and define a first opening at a first end for receiving the granular construction material into the interior and a second opening at a second end. The extensible shell can be flexible such that the shell expands when granular construction material is compacted in the interior of the shell. A method may include positioning the extensible shell in the ground and filling at least a portion of the interior of the shell with the granular construction material. The granular construction material may be compacted in the interior of the extensible shell to form a support pier.