Chemical Expansion Element for Soil Stabilization
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Solution Overview
Problem
Existing methods for improving soil bearing capacity and lifting structures are laborious, expensive, and complex, particularly in soft soils, and often require high hydraulic pressure and complex equipment, with risks of uncontrolled expansion and equipment failure.
Innovation Solution
A method using a chemical reaction-expanding substance injected into an expansion element, which generates force against the soil through a chemical reaction, allowing controlled expansion and stabilization without the need for high-pressure equipment, suitable for use in small holes and soft soils, with the expansion element anchoring in place to prevent uncontrolled movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If high hydraulic pressure is used to inject expanding substance into bags, then the expanding force is sufficient to lift structures, but the equipment becomes complex and failure-sensitive
Solution Approach 1:
The patent replaces the mechanical hydraulic pressure system with a chemical reaction system. Instead of using high-pressure pumps and hydraulic valves to force expanding substance into bags, the invention uses chemical reactions (such as cement hydration or foam expansion) that naturally generate the required expanding force within the bags, eliminating complex mechanical equipment while achieving sufficient lifting force
Solution Approach 2:
The invention changes the parameter of pressure generation from external mechanical application to internal chemical generation. The expanding substance generates pressure through chemical reactions occurring within the bag itself, transforming the pressure source from an external mechanical system to an internal chemical process, thereby simplifying equipment while maintaining effective force
2Stability of the object's composition
If expanding bags are used in soft soil, then soil improvement is achieved, but the bags may not stay in place and condensing control becomes difficult
Solution Approach 1:
The patent uses flexible bags made of appropriate materials that can adapt to soft soil conditions while maintaining their containing function. These flexible shells are designed to work effectively in soft soil environments, providing reliable containment for the expanding substance and ensuring stable position even in challenging soil conditions
Solution Approach 2:
The expanding substance and bag system is designed to be self-contained and self-regulating. The chemical reaction occurs within the sealed bag, automatically generating the required expanding force without external control mechanisms. This self-service approach ensures reliable operation in soft soil without requiring complex positioning or control equipment
3Strength
If mass exchange is used to improve soil bearing capacity, then bearing capacity increases, but the process becomes extremely laborious and expensive
Solution Approach 1:
The invention changes the approach from complete mass exchange to in-place soil improvement through chemical expansion. Instead of removing poor-bearing soil and replacing it with high-strength material (mass exchange), the method uses expanding substances to improve the existing soil's bearing capacity, dramatically reducing labor and cost while achieving similar structural support
Solution Approach 2:
The patent replaces the mechanical mass exchange process (excavation, material removal, replacement, compaction) with a chemical expansion process. The expanding substance chemically transforms the soil in place, eliminating the need for heavy equipment, material transport, and manual labor associated with mass exchange, thereby greatly improving productivity
4Strength
If piling techniques are used to support structures, then bearing capacity is improved, but heavy equipment is required and the structure is subjected to point loads
Solution Approach 1:
The invention changes the support mechanism from concentrated point loads through piles to distributed expansion forces throughout the soil mass. The expanding substance distributes the lifting and support forces across a broader area, eliminating the need for heavy piling equipment and reducing point load concentrations on the structure
Solution Approach 2:
Instead of driving piles into the ground to reach bearing layers (top-down approach), the invention injects expanding substances into the soil to create support from within (bottom-up approach). This inverted methodology eliminates the need for heavy piling equipment and provides more uniform load distribution to the structure
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 provides efficient soil stabilization and structure lifting with controlled expansion pressure, reducing environmental disturbance and equipment complexity, ensuring safety and effectiveness even in soft soils, as the substance hardens quickly and maintains stability without extensive excavations.
Implementation Method 1
A substance which expands as a consequence of a chemical reaction is injected into the expansion element, so that a force pressing the expansion element against the surrounding soil is generated mainly by the chemical reaction
Data Source
Figure 1~3
Figure 2
Figure 4a~6
AI summary
A hole (6) is provided in soil or a structure, and an injection bar (1) having a fillable expansion element (2) in connection therewith is arranged into the hole. A substance which expands as a consequence of a chemical reaction is in- jected into the expansion element (2). The expansion element (2) filled with the reacted substance condenses, fills or replaces surrounding soil or lifts as well as stabilizes ground-based structures. A force pressing the expansion element (2) against the soil is generated by the chemical reaction which expands the substance injected into the expansion element (2).