Mixed Turf Backing Segmentation for Root Penetration
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Solution Overview
Problem
Traditional mixed turf systems for sports and recreational areas face issues such as high maintenance costs, limited root penetration, anaerobic bacterial activity leading to toxic gas release, and impermeability, which result in poor durability and water management.
Innovation Solution
A mixed turf system featuring a non-biodegradable, three-dimensionally structured backing with a jagged surface, combined with a geocomposite and tufted synthetic filaments, allows for deep root growth and improved water infiltration, supported by a drainage system and organic upper and lower layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the backing of synthetic turf is made biodegradable to enable deep root penetration, then root growth is improved, but the backing loses strength and connection between synthetic grass and backing deteriorates
Solution Approach 1:
The backing is divided into two distinct layers: a non-biodegradable upper layer that maintains structural strength and synthetic grass attachment, and a biodegradable lower layer that degrades to allow root penetration into the soil. This segmentation resolves the contradiction by assigning different functional requirements to different parts of the backing structure.
Solution Approach 2:
Different regions of the backing have different biodegradability properties - the upper layer remains stable while the lower layer degrades. This local differentiation of material properties allows the backing to simultaneously provide structural support where needed and facilitate root growth where required.
2Stability of the object's composition
If the backing is made impermeable to provide structural stability, then structural stability is improved, but water infiltration and air circulation are restricted
Solution Approach 1:
The backing is segmented into an impermeable upper layer for structural stability and a permeable biodegradable lower layer for water and air passage. This segmentation allows the system to simultaneously achieve structural integrity and adequate drainage/ventilation.
Solution Approach 2:
The biodegradable lower layer of the backing is designed with porous characteristics that allow water infiltration and air circulation. As this layer degrades over time, it creates channels for root penetration and improves soil aeration, preventing waterlogging and anaerobic conditions.
3Ease of manufacture
If synthetic turf covering is used to reduce maintenance costs, then maintenance costs are reduced, but root penetration is limited and toxic gases are released
Solution Approach 1:
The backing is divided into non-biodegradable and biodegradable layers, where the biodegradable lower layer gradually degrades to allow root penetration and prevent anaerobic conditions that produce toxic gases, while the non-biodegradable upper layer maintains structural integrity and keeps maintenance costs low.
Solution Approach 2:
The biodegradability parameter of the backing is changed over time - the lower layer progressively degrades from a barrier to a permeable structure, allowing the system to transition from an impermeable state to a state that facilitates root growth and prevents toxic gas accumulation.
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 system provides a strong, economical, and permeable surface that reduces maintenance, allows for rapid water infiltration, and minimizes toxic gas release, ensuring healthy root growth and effective water management.
Implementation Method 1
a three-dimensionally structured backing (4) with a jagged surface... which allows the water to infiltrate through the structure
Implementation Method 2
a drainage system and organic upper and lower layers
Data Source
Figure 1
Figure 2a~3b
Figure 2b~2d
AI summary
A mixed turf (1 ) arranged on a soil (10) and comprising: a synthetic turf (2), natural grass (3) arranged in the synthetic turf (2), said synthetic turf (2) comprising: synthetic filaments (5) suitable to simulate grass blades and a backing (4) consisting of a membrane suitable to support the synthetic filaments (5), the backing (4) being further as a whole substantially draining, enabling transpiration and permitting the passage therethrough of the roots of said natural grass (3) and which is non-biodegradable.