MMVF Drain Elements for Surface Water Management
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Solution Overview
Problem
Existing drainage systems for recreation grounds, such as children's playgrounds and sports fields, are often insufficient, requiring frequent maintenance and secondary drainage systems, and fail to effectively manage surface water without becoming contaminated with earth or being costly to install and maintain.
Innovation Solution
A structure comprising a coherent force distribution layer and a drain layer formed of hydrophilic man-made vitreous fiber (MMVF) drain elements, where the drain layer has passages for water flow and is designed to absorb and store water until it can be dissipated back into the ground, without the need for geo-textile wrapping and with a high buffering capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional drainage lines with gravel and geo-textile are used, then water drainage is provided, but the system requires frequent maintenance and secondary drainage systems due to insufficient drainage capacity
Solution Approach 1:
The patent uses porous expanded metal as the drainage element, which provides high porosity and permeability for efficient water drainage. The porous structure allows water to flow through while maintaining structural integrity, eliminating the need for geo-textile wrapping and reducing maintenance requirements.
Solution Approach 2:
The invention combines expanded metal with geopolymer concrete to create a composite drainage element. The expanded metal provides porosity and drainage capacity, while the geopolymer concrete provides structural strength and stability, creating a single element that replaces multiple traditional components.
2Quantity of substance
If gravel is used to create drainage area around drainpipe, then water can run freely towards drainpipe, but the gravel capacity to hold water is limited by available space between particles
Solution Approach 1:
The expanded metal provides a three-dimensional porous structure with significantly higher water storage capacity compared to gravel. The interconnected pores throughout the structure allow both water storage and free flow, resolving the contradiction between holding water and draining water efficiently.
3Object-affected harmful factors
If geo-textile is wrapped around drainpipe to prevent soil contamination, then soil entry through apertures is prevented, but the system becomes more complex and costly
Solution Approach 1:
The geopolymer concrete coating on the expanded metal creates an integrated structure that is inherently resistant to soil contamination. The concrete layer acts as a protective barrier while the expanded metal core maintains drainage functionality, eliminating the need for separate geo-textile wrapping.
4Reliability
If secondary drainage systems with sand trenches are installed, then surface water management is improved, but excavation costs are high and regular maintenance with sand dressing is required
Solution Approach 1:
The patent changes the material parameter from traditional gravel-sand systems to expanded metal with geopolymer concrete. This material substitution provides equivalent or superior drainage performance while eliminating the need for extensive excavation and reducing maintenance requirements.
Solution Approach 2:
The expanded metal drainage element is designed as a long-lasting, maintenance-free solution that replaces the need for periodic sand dressing in traditional systems. The durable geopolymer concrete coating ensures long-term performance without requiring replacement or maintenance.
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
The solution provides efficient water drainage, reduces maintenance needs, and extends the usability of the surface by effectively conveying water to disposal points while preventing contamination and being environmentally acceptable and economical.
Implementation Method 1
the drain layer is formed of an array of coherent hydrophilic man-made vitreous fiber (MMVF) drain elements... each of the drain elements comprises man-made vitreous fibres bonded with a cured binder composition
Implementation Method 2
designed to absorb and store water until it can be dissipated back into the ground... the drain elements can absorb water and store it within their open pore structure
Implementation Method 3
convey water to a water disposal point... the drain elements can convey water along the passage towards the first opening
Data Source
Figure 1~3
Figure 4~6
Figure 7
AI summary
Structure for draining surface water, comprising a coherent force distribution layer (1) and a drain layer, wherein the drain layer is formed of an array of coherent man-made vitreous fiber (MMVF) drain elements (2), wherein each of the drain elements (2) comprises man-made vitreous fibres bonded with a cured binder composition, wherein the drain layer is below the force distribution layer (1).