Articulated Concrete Mat Structure for Subsea Pipeline Support
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Solution Overview
Problem
Existing erosion control mats and pipeline protection systems lack effective solutions for providing stable and durable support for underwater pipelines and equipment, particularly in subsea environments, where they must withstand erosion and structural integrity challenges.
Innovation Solution
A concrete mat apparatus comprising elongated concrete members connected by cables or ropes, forming a matrix with inclined surfaces and reinforcement bars, allowing for articulation and load transfer to the seabed, and featuring padded surfaces for improved pipeline and equipment support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional erosion control mats are used for pipeline protection, then basic erosion control is achieved, but they lack effective load distribution capability and stable support for underwater pipelines
Solution Approach 1:
The mat is divided into multiple discrete blocks (e.g., tetrapod-shaped blocks) interconnected by cables, allowing each block to independently bear and distribute loads while maintaining overall structural integrity. This segmentation enables effective load distribution across the seabed without requiring a monolithic complex structure.
Solution Approach 2:
The system combines concrete blocks with cable connections and geotextile layers to create a composite structure that leverages the compressive strength of concrete, the flexibility and tensile strength of cables, and the protective properties of geotextile, achieving reliable pipeline support through material composition rather than structural complexity.
2Strength
If rigid concrete blocks are used for erosion control, then structural strength is improved, but articulation capability and drainage are reduced
Solution Approach 1:
The cable connections between concrete blocks allow the rigid blocks to articulate and adjust their positions relative to each other, enabling the mat to adapt to uneven seabed surfaces and dynamic loading conditions while maintaining the structural strength of individual blocks.
Solution Approach 2:
The tetrapod-shaped blocks feature locally optimized geometries with inclined surfaces and openings that provide both structural strength and articulation capability, allowing each block to interlock with neighbors while maintaining drainage pathways and flexibility in the overall structure.
3Force
If blocks are closely spaced for load distribution, then load bearing capacity is improved, but drainage capability is reduced
Solution Approach 1:
The tetrapod-shaped blocks incorporate openings and voids within their structures, creating a porous configuration that allows water to pass through while the blocks themselves provide load bearing capacity. The cable connections between blocks further create channels for water flow, maintaining drainage capability despite close spacing.
4Ease of manufacture
If traditional mat structures are used, then installation simplicity is maintained, but pipeline protection effectiveness is insufficient
Solution Approach 1:
The segmented block structure allows for modular installation where blocks can be individually placed and connected with cables, maintaining relative installation simplicity while the interconnected configuration provides enhanced pipeline protection effectiveness through distributed load bearing and erosion control.
Data Source
AI summary
A concrete mat apparatus, including a plurality of elongated concrete members, each member being aligned with and next to another concrete member. Each of the concrete members has an upper generally flat surface, a lower generally flat surface, and a plurality of inclined surfaces that each extend away from an upper or lower surface. Reinforcement extends from a first end portion of each concrete member to a second end portion thereof, the reinforcement including a plurality of longitudinally extending reinforcement bars and a plurality of encircling tie bars at spaced apart intervals. Cabling connects each of the elongated concrete members to another of the elongated concrete members. The combination of elongated concrete members has a width and a length that is at least twice as long as the width. The upper inclined surfaces of one of the elongated concrete members forms a plane with the lower inclined surface of an adjacent elongated concrete member. A plurality of loops are provided along opposed edges of the mat, each loop formed by a portion of the cabling. The loops can be spaced between about one and three feet (30.5 and 91.4 cm) apart.