Concrete Slab Elevation via Multi-Stage Resin Injection
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Solution Overview
Problem
Existing methods for modifying concrete slabs on subsided ground using expandable resin are inefficient when ground subsidence occurs over a wide area, requiring multiple injections and are sensitive to injection position, order, and process control, leading to inconsistent quality.
Innovation Solution
A method involving the systematic injection of expandable resin from strategically determined points on the concrete slab, using a grid or staggered pattern with a pitch of 0.5 to 2.0 m, focusing on the most severe subsidence areas, with each injection expanding the slab by up to 30 mm to achieve uniform elevation and ground compaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If expandable resin is injected only once, then the process is simple, but the resin does not sufficiently spread into the subsided ground or space between ground and concrete slab
Solution Approach 1:
The injection process is divided into multiple sequential stages, with each stage targeting a specific region based on subsidence severity. The ground area is segmented into zones, and resin injection is performed in a predetermined order from severely subsided areas to less affected areas, ensuring comprehensive coverage while maintaining process control
Solution Approach 2:
Before resin injection, the subsided ground area is surveyed and segmented into specific injection zones in advance. A predetermined injection order is established based on the severity assessment, allowing the resin to spread systematically through pre-planned pathways rather than randomly, improving overall penetration efficiency
2Manufacturing precision
If expandable resin is injected more than once to improve coverage, then the resin spread is sufficient, but the work process becomes complex and quality control becomes difficult
Solution Approach 1:
The multi-injection process is organized into clearly defined sequential stages, each with specific objectives and target zones. This segmentation transforms a complex repeated injection process into a systematic procedure where each stage builds upon the previous one, making quality control more manageable
Solution Approach 2:
The injection process incorporates feedback mechanisms where the results of each injection stage are assessed before proceeding to the next stage. This allows for quality control at each step, ensuring that the resin has adequately penetrated and pushed the slab before moving to adjacent zones, thereby maintaining consistent quality across the entire treatment area
3Manufacturing precision
If expandable resin is injected more than once to improve coverage, then the resin spread is sufficient, but quality is significantly affected by injection position, order, and process control
Solution Approach 1:
The subsided ground is surveyed and divided into specific injection zones before the injection process begins. A predetermined injection order is established based on subsidence severity assessment, ensuring that resin is always injected in the optimal sequence. This preliminary planning eliminates variability in injection positioning and ordering, making the quality outcome reliable and repeatable
Solution Approach 2:
The treatment area is segmented into distinct zones with clearly defined injection sequences. Each zone has predetermined injection points and parameters, which standardizes the process across different operators and projects, thereby improving quality consistency and reducing variability
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 allows for accurate and controlled modification of concrete slabs on subsided ground, ensuring uniform elevation and reducing the need for repeated injections, thereby improving the quality and efficiency of the process.
Implementation Method 1
an expandable resin is injected into an inside of subsided ground or a space formed between the ground and a concrete slab, and the expandable resin is expanded to push up the concrete slab
Data Source
AI summary
An object of the present invention is to provide a method for accurately modifying a concrete slab on subsided ground by injecting an expandable resin below the concrete slab more than once, which also allows for easy control of the work process. The method of the present invention as a means for resolution includes performing the following steps: on a concrete slab in an area including a region where ground subsidence has occurred, determining points to drill injection holes for injecting an expandable resin at a pitch of 0.5 to 2.0 m in a grid pattern or a staggered pattern; injecting an expandable resin below a point where the subsidence of the concrete slab is severest and expanding the expandable resin to push up the concrete slab at most 30 mm more than once.