Modular Excavation Shoring Assembly for Jacked Removal
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Solution Overview
Problem
Existing shoring systems for deep excavations are expensive and difficult to install and remove, especially in unstable soil conditions, and there is a need for cost-effective and functional shoring solutions that can be safely removed when excavations are no longer needed.
Innovation Solution
A shoring assembly comprising a base unit and extension units with jacking lugs and lifting features, designed to be installed and removed from excavations, featuring walls that extend parallel to the central axis to minimize lifting resistance and include stiffening rings for stability, allowing for safe and efficient installation and extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If permanent shoring structures are used for deep excavations in unstable soil, then the reliability and safety of the excavation is improved, but the cost increases and the structures cannot be removed for reuse
Solution Approach 1:
The shoring structure is divided into modular segments (base unit and extension units) that can be assembled to different lengths and configurations. This segmentation allows the use of standardized, reusable components rather than custom-built permanent structures, reducing costs while maintaining reliability through proper modular assembly.
Solution Approach 2:
The shoring structure is designed to be temporary and removable. After serving its purpose during excavation, the entire structure can be extracted and reused for other projects. This recovering principle transforms the one-time-use permanent structures into reusable assets, improving cost-effectiveness while maintaining excavation stability during the work period.
2Reliability
If traditional metal plate and cross member shoring structures are used, then the excavation can be shored effectively, but placement and removal become difficult in deep excavations and unstable soil conditions
Solution Approach 1:
The shoring structure incorporates movable elements including the ability to extend and retract the overall length by adding or removing extension units. The jacking lugs and receivers enable the structure to be jacked outward as excavation progresses, and later jacked inward for removal. This dynamic capability allows easy installation and removal in deep excavations while maintaining shoring effectiveness.
Solution Approach 2:
The extension units can be nested within or attached to the base unit, allowing the shoring structure to be compacted for transport and then extended to the required length at the excavation site. This nesting principle facilitates easy installation and removal by enabling the structure to be broken down into manageable components that can be handled with standard equipment.
3Ease of operation
If the shoring structure walls extend parallel to the central axis to minimize lifting resistance, then the ease of removal is improved, but the structural stability may be compromised
Solution Approach 1:
The shoring structure applies different geometric principles to different parts: the outer wall extends parallel to the central axis to minimize lifting resistance and facilitate removal, while the inner wall includes transverse edges that provide structural strength and stability during operation. This local differentiation of geometric properties allows the structure to simultaneously achieve ease of removal and structural stability.
Solution Approach 2:
The structure is divided into functional segments: the outer cylindrical wall for minimal friction and easy extraction, and the inner structural framework with transverse elements for strength and stability. This segmentation allows each part to be optimized for its specific function without compromising the other.
Data Source
AI summary
An assembly for shoring temporary surface excavations includes a base unit and a first extension unit. The base unit includes features for allowing the assembly to be jacked out of the excavation when hoisting becomes impossible or impractical. The shoring structure may also be jacked into an unstable excavation from above.