Concrete Slab Stabilization via Pre-Loaded Soil Injection
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Solution Overview
Problem
Concrete slabs supported by particulate materials often crack due to inadequate support from the soil, leading to accelerated deterioration and failure of the slab, as existing repair methods like injecting material into the soil or using adhesively attached members are ineffective in providing long-lasting solutions.
Innovation Solution
A method involving selecting a load to apply pressure to the particulate, injecting material below the load, allowing it to set, and then injecting further material through a created hole, which improves soil consolidation and support, while monitoring the process to prevent over-lifting and ensure even distribution of load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If material is injected into the soil below the slab to lift and stabilize it, then the slab is lifted to the desired elevation and stabilized, but the soil may continue to subside and the injected material may not provide long-lasting support
Solution Approach 1:
A load is applied to the slab before injecting material into the soil. This preliminary loading compacts the soil and creates a more stable foundation, ensuring that when the injected material sets, it provides sustained support. The load is removed after injection to prevent over-lifting while maintaining the stabilization benefits.
Solution Approach 2:
The state of the soil is changed by applying a load that compacts it, altering its density and bearing capacity. This parameter change ensures the soil can better support the injected material and provide long-lasting stabilization rather than continuing to subside.
2Manufacturing precision
If a load is applied to the slab during material injection to prevent over-lifting, then the slab is stabilized at the correct elevation, but the process becomes more complex and time-consuming
Solution Approach 1:
The slab itself serves as the loading mechanism. Its own weight provides the necessary load during injection without requiring external loading equipment. This self-service approach simplifies the process while maintaining precise elevation control, as the slab's weight is automatically applied and removed when needed.
3Ease of manufacture
If material is injected below the slab without applying a load first, then the injection process is simpler, but the soil subsidence continues and the stabilization is ineffective
Solution Approach 1:
Applying a load before injection is a preliminary action that compacts the soil and creates optimal conditions for stabilization. This simple preparatory step ensures the injected material will be retained by the soil and provide effective, long-lasting support rather than being lost to ongoing subsidence.
4Reliability
If too much material is injected to ensure complete stabilization, then the slab is fully supported, but the slab develops raised portions that compromise its structural integrity
Solution Approach 1:
The applied load provides feedback control during injection. As material is injected, the load prevents over-lifting, and the process can be monitored to stop at the precise point where stabilization is achieved without creating raised portions. This feedback mechanism ensures complete stabilization while preserving slab integrity.
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 effectively stabilizes and lifts sunken concrete slabs by improving soil consolidation, reducing the risk of further settlement, and ensuring even load distribution, resulting in a more durable and long-lasting repair.
Implementation Method 1
injecting material below the load; allowing the injected material to set
Implementation Method 2
selecting a load based on a planned in use loading of the particulate; applying the load to the particulate; improves soil consolidation
Data Source
Figure 1~3
Figure 4a~5
Figure 6~7b
AI summary
A method, of treating particulate (34), in substance including selecting a load (17) based on a planned in use loading of the particulate; applying the load to the particulate; injecting material (28) below the load; and removing the load.