Modular Concrete Underlayer Mat for Breakwater Stability
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Solution Overview
Problem
The construction of embankment breakwaters faces challenges due to the unavailability of calibrated natural rockfill, instability of the underlayment during construction, and difficulties in achieving the required distribution and size tolerances of the underlayer blocks, leading to increased costs and delays.
Innovation Solution
A sub-layer for embankment dikes comprising a mat of concrete pads assembled with flexible connecting means, such as cables or geotextile, to form a stable and easily deployable underlayer that can resist wave action and ensure proper filter and roughness characteristics for the armor blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If natural rockfill is used for the underlayer, then the construction can proceed with available materials, but the rockfill is often uncalibrated or poorly graded leading to instability and construction delays
Solution Approach 1:
The underlayer is divided into modular concrete pads of standardized dimensions (e.g., 0.5m x 0.5m x 0.3m) that can be systematically assembled. This segmentation allows for precise control of the underlayer composition and ensures calibration consistency, eliminating the need for uncalibrated natural rockfill while maintaining stability through uniform modular units.
Solution Approach 2:
The concrete pads are pre-manufactured with standardized dimensions and properties before deployment. This preliminary action ensures that the underlayer materials are already calibrated and ready for installation, eliminating the need for on-site sorting or adjustment of natural rockfill and ensuring consistent performance from the start of construction.
2Ease of manufacture
If small uninterlocked blocks are used for the underlayer, then the construction can use readily available materials, but the underlayment becomes unstable during construction and may be destroyed by wave action
Solution Approach 1:
Multiple concrete pads are connected together using flexible connecting means (cables, chains, or geotextile) to form a continuous mat structure. This merging of individual pads into an interconnected system provides stability during construction while maintaining the ability to resist wave action, eliminating the instability problem of loose uninterlocked blocks.
Solution Approach 2:
Flexible connecting means such as cables, chains, or geotextile are used to connect the concrete pads, creating a flexible yet stable mat structure. This flexible connection system maintains the integrity of the underlayment during construction while allowing for some movement and adaptation to wave action, preventing destruction by swell.
3Manufacturing precision
If strict tolerances are imposed on underlayer block distribution and size, then the armor blocks can be properly placed, but the underwater construction becomes difficult and requires divers for position corrections
Solution Approach 1:
The underlayer is segmented into standardized concrete pads with precise, controlled dimensions (e.g., 0.5m x 0.5m x 0.3m). This segmentation allows for easy manufacturing with tight tolerances while simplifying the construction process, as the standardized pads can be systematically placed without requiring complex underwater positioning adjustments by divers.
Solution Approach 2:
The concrete pads are pre-manufactured with precise dimensions and properties in a controlled environment before deployment. This preliminary action ensures that the tolerances are met during manufacturing rather than during underwater installation, making the construction process easier and eliminating the need for diver interventions for position corrections.
4Productivity
If the underlayer is constructed before armor block placement, then the construction sequence can be optimized, but the underlayment is exposed to wave action and may be destroyed before armor protection is in place
Solution Approach 1:
The concrete pads are connected using flexible connecting means to form a continuous mat that provides immediate structural integrity. This merged structure resists wave action better than loose blocks, allowing the underlayer to be constructed before armor placement without being destroyed by swell, thus optimizing the construction sequence.
Solution Approach 2:
The flexible connecting means create a cohesive mat structure that provides protection against wave action. This flexible yet unified structure maintains stability during construction while allowing for some movement, protecting the underlayment from destruction by swell before the armor blocks are placed.
Data Source
Figure 1~5
AI summary
The present invention relates mainly to an underlayment element (2) for a mound breakwater (1), comprising a plurality of concrete blocks, characterised in that said blocks are assembled with one another by flexible linking means so as to form a carpet. The invention also relates to a method for manufacturing such an underlayment element (2) and a method for manufacturing a mound breakwater (1) comprising such an underlayment element (2).