The plastic underdrain is composed of a plastic core wrapped with a filter fabric assembly. The plastic core is primarily made of thermoplastic synthetic resin, modified and extruded into fine plastic filaments in a molten state through a nozzle. These filaments are then fused at junctions by a molding device to form a three-dimensional mesh structure. The plastic core comes in various forms, including rectangular, hollow matrix, circular hollow circular, and more. This material overcomes the shortcomings of traditional underdrains, featuring high surface porosity, good water collection, large void ratio, excellent drainage, high compressive strength, good pressure resistance, flexibility, adaptability to soil deformation, durability, light weight, ease of construction, and significantly reduced labor intensity for workers. Consequently, it is widely welcomed by engineering departments and has been extensively applied.
Features:
1. The composition fibers of the plastic drainage channel are about 2mm thick, fused and formed at junction points, creating a three-dimensional mesh structure. This principle is similar to the truss principle in steel structural construction. The surface is perforated at 95-97%, which is more than five times that of a perforated pipe, and three to four times that of a resin mesh pipe, with a high surface water absorption rate.
2. Due to its three-dimensional structure, the void ratio is 80-95%, creating a space that is both manageable and lightweight. Its compressive strength is over 10 times greater than that of tube structures. Consequently, even under excessive load, the residual voids are still over 50%, eliminating any issues with water flow. There's no need to worry about being damaged by soil pressure.
3. High compressive strength, with a compression rate under 10% at 250 KPa pressure.
4. Enhanced with anti-aging agents, durable and long-lasting; remains stable even after decades of placement underwater or in soil.
5. High-compression and flexible, suitable for curves and bends, extremely lightweight. If the backfill depth is around 10 cm, it can also be backfilled using a bulldozer.
6. Due to these characteristics, issues commonly encountered with traditional blind channels, such as uneven settlement or partial blockage caused by overloading, leading to crushed channels with no remaining voids and functional failure, can be resolved with plastic blind channel materials.
7. Due to the molding process using heat fusion without the use of adhesives, there will be no deterioration caused by adhesive aging or peeling.
Application Scope:
1) Roadbed and shoulder reinforcement and drainage for highways and railways.
2) Drainage for tunnels, subway passages, and underground warehouses.
3) Soil and water conservation for slope and embankment development.
4) Various retaining wall vertical and horizontal drainage.
5) Drainage for slippery ground
6) Coal-fired power plant ash pond drainage; landfill project drainage;
7) Drainage for recreational areas such as golf courses, baseball fields, soccer fields, parks, and green spaces for rest.
8) Roof garden and planter box drainage
9) Construction foundation excavation drainage
10) Agricultural and horticultural underground irrigation and drainage systems
11) Drainage systems for low-lying and damp areas. The drainage materials used in land preparation projects, internationally known as Geocomposite Drainage Systems (GDS), are also referred to as three-dimensional drainage boards and drainage channel materials for civil engineering. They are a three-dimensional, porous material formed by melting thermoplastic synthetic resins, extruding fiber strands through nozzles, and fusing their connection points together.
