Expansive Polymer Rapid Pier Construction
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Solution Overview
Problem
Existing drilled-shaft foundations face issues such as excessive weight from materials like concrete and steel, delayed construction due to concrete curing, and complications from excessive free water in the soil, which hinder rapid and efficient installation of structural piers.
Innovation Solution
A method involving a lightweight casing and the injection of an expansive polymer material that expands in the soil to form a strong and rigid pier, with features like perforations to create friction and a fast reaction time to achieve high compressive strength quickly, allowing for rapid construction and reduced weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional materials like concrete and steel are used to form drilled-shaft foundations, then high strength and bearing capacity are achieved, but significant weight is added to the soil system
Solution Approach 1:
The patent changes the material parameter from traditional concrete/steel to expansive polymer foam, which has fundamentally different density and strength characteristics. The polymer achieves sufficient bearing capacity through expansion pressure and soil interlocking rather than through high material density, thus reducing weight while maintaining strength
Solution Approach 2:
The foundation system becomes a composite of polymer material and soil, where the polymer expands to create interlocking fingers with the surrounding soil. This composite action provides strength through the combination of polymer rigidity and soil friction, rather than relying solely on heavy monolithic materials
2Strength
If concrete is used to form drilled-shaft foundations, then high strength is achieved, but cure time delays the time until the foundation can be loaded
Solution Approach 1:
The patent utilizes the phase transition of the polymer from liquid injection state to expanded solid state. This expansion process occurs rapidly upon injection, creating immediate structural support without the prolonged curing time required for concrete hydration. The phase change itself generates the strengthening mechanism
Solution Approach 2:
The polymer is injected in a liquid or semi-liquid state that allows it to fill the borehole and expand into the surrounding soil before the structure is loaded. This preliminary expansion creates the load-bearing structure in advance, eliminating the waiting period required for concrete to cure to sufficient strength
3Reliability
If individual piers are constructed using traditional methods, then adequate foundation support is provided, but construction is time consuming and difficult in certain ground conditions such as excessive free water
Solution Approach 1:
The patent uses hydraulic injection to deliver the polymer material into the borehole and surrounding soil. This hydraulic delivery system allows the material to be pumped through flexible hoses to difficult-to-reach locations, including areas with excessive water, and the polymer's expansion properties allow it to displace or mix with water without compromising the foundation structure
Solution Approach 2:
The polymer material performs multiple functions automatically upon injection: it expands to fill voids, creates interlocking fingers with the soil, provides immediate structural support, and resists water infiltration. This self-service capability eliminates the need for complex formwork, reinforcement placement, and curing procedures required by traditional concrete methods
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 the rapid installation of structural piers with improved bearing capacity and reduced vertical movement, overcoming the limitations of traditional materials and soil conditions, allowing for quicker load-bearing capabilities and enhanced structural support.
Implementation Method 1
injecting an expansive material into the casing... the polymer, in one embodiment, has a fast rise time so that it reaches 90% compressive strength in one hour
Implementation Method 2
it is a two-component polymer that chemically reacts
Implementation Method 3
perforations for allowing some of the expansive material to be ejected from the casing into the surrounding soil to create fingers or branches for the purpose of at least adding friction
Data Source
AI summary
A method and apparatus for rapidly constructing a structural pier comprising the steps of placing into a soil under a structure to be supported a casing having an inner diameter and an outer diameter, positioning an injection tube into the inner diameter of the casing, and injecting an expansive material into the casing. Optional perforations in the casing allow some of the expansive material to be ejected from the casing into the surrounding soil to create fingers or branches for the purpose of adding friction to the structural pier.