Concrete Cutting Foam Injection for Dust Control
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Solution Overview
Problem
Existing methods for cutting concrete structures, especially those of significant size and potentially irradiating or contaminated like nuclear reactor casings, face challenges in maintaining a controlled cutting process to prevent dispersion of concrete dust and radioactive materials, and are ill-suited for long cutting fronts.
Innovation Solution
A method involving a diamond-coated cable passing through orifices in the concrete structure, with injected foam for lubrication and containment, using a containment chute or box to confine the foam, and a cleaning device to collect and treat the foam, ensuring homogeneous distribution and preventing spillage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If foam is injected into concrete structures during cutting operations, then dust dispersion is reduced and cutting edge is lubricated, but homogeneous distribution of foam on the cutting edge is difficult to achieve over long cutting fronts
Solution Approach 1:
The cutting front is divided into multiple segments with separate injection orifices positioned at different locations. This segmentation allows foam to be injected at multiple points simultaneously, ensuring homogeneous distribution across the entire cutting front while maintaining effective dust suppression at each segment.
Solution Approach 2:
Injection orifices are strategically positioned at specific locations along the cutting front to deliver foam precisely where needed. Each orifice provides localized foam injection tailored to the specific requirements of that segment of the cutting front, ensuring optimal lubrication and dust control at each location.
2Productivity
If cutting operations are performed on structures of significant size with long cutting fronts, then complete cutting is achieved, but existing foam injection techniques are ill-suited for such lengths
Solution Approach 1:
The cutting front is divided into multiple segments with separate injection orifices positioned at different locations. This segmentation allows foam to be injected at multiple points simultaneously, ensuring homogeneous distribution across the entire cutting front while maintaining effective dust suppression at each segment.
Solution Approach 2:
The injection system transitions from a single-point injection approach to a multi-point distributed injection approach along the cutting front. This dimensional expansion of the injection strategy enables effective foam distribution across long cutting fronts that would be impossible with conventional single-point injection.
3Ease of manufacture
If conventional cutting methods are used on irradiating or contaminated elements, then cutting operations can be performed, but dispersion of concrete dust and radioactive materials occurs
Solution Approach 1:
Foam acts as an intermediary substance between the cutting edge and the surrounding environment. It captures dust and radioactive particles at the source, forming a contained mixture that prevents dispersion into the environment while allowing the cutting operation to proceed efficiently.
Solution Approach 2:
The foam converts the potentially harmful dispersion of radioactive dust into a beneficial contained mixture. By capturing particles that would otherwise disperse, the foam transforms a hazardous situation into a controlled process where contaminated foam can be collected and treated as a unified waste stream.
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 efficient, controlled cutting over long lengths while minimizing dust dispersion and radioactive contamination, enabling effective collection and treatment of cutting products for safe handling.
Implementation Method 1
the cutting of an element 11 of the concrete structure by means of a diamond wire 21
Implementation Method 2
allow the cutting edge to be lubricated and cooled
Implementation Method 3
allow the cutting edge to be lubricated and cooled
Implementation Method 4
capture dust and other cutting products to prevent their dispersion
Data Source
Figure 1
Figure 2A~2B
Figure 3~4
AI summary
The invention relates to the field of modifying concrete structures and, more specifically, to the field of dismantling nuclear facilities. The invention particularly relates to a method for modifying a concrete structure comprising: - cutting 110 of a structural element along a cutting face and - injecting 120 of foam at several different points along the cutting face, wherein the concrete structural element is cut using a diamond wire passing through first and second orifices traversing the concrete structural element and following the cutting face between the first and second orifices, and wherein the concrete structural element has a third orifice located between the first and second orifices and receiving foam injected during the cutting process. The invention also relates to a treatment 140 of the foam containing the cutting residue.