Net One is an advanced rock fall protection net developed from large-scale rock fall experiments.
Comprised of a wire mesh with superior elastic deformation characteristics, shock absorption equipment to reduce the load on the entire net, and wire rope to disperse the shock throughout the entire net. Installation time is dramatically reduced, and the method itself is easily implemented. Net One is available in sheathing and pocket types to suit differing site conditions.
The sheathing type covers the entire slope from the rock fall source to the bottom, and is designed to handle maximum rock falls of 100kN (approximately 10 tons), and maximum rock fall energy of approximately 4,000kJ.
The Pocket type incorporates poles installed at the top of the net, and traps the rock falling from the top of the slope. The shock and speed of rocks colliding with the net is attenuated, and the rocks reach a safe location in a controlled fall. Designed to handle maximum rock falls of 100kN (approximately 10 tons), and maximum rock fall energy of approximately 4,000kJ.
Net One Types
Pocket Type
Pocket Type
Sheathing Type
Installation Costs and Specifications
| Net One (pocket type) |
100kN |
| Energy accommodated | 4,000kJ |
| Direct construction costs | Y15,000 - Y22,000/ |
Net One Points
Superior stretch and strength.
A diamond-shaped wire mesh superior to diamond or hexagonal meshes is employed for excellent stretch and strength characteristics. Localized rupture of the mesh is contained, and does not propagate.
The rock slides down the slope when the tensile force reaches 20kN.
The shock absorption equipment allows the rock to slide while maintaining a load of approximately 20kN, irrespective of the scale and speed of the rock fall, thus reducing the load on the entire net, and accommodating large rock falls. The wire mesh and wire rope slip simultaneously, increasing the range of the shock absorption effect.
Load dispersed by a combination of types.
From Rock Fall to Controlled Flow
Rocks (10tonnes) separate and fall down the slope.
The energy of the rock fall is absorbed by the shock absorbers attached to the anchors, and the friction of the slip ropes.
The energy of the falling rocks is absorbed, with some rocks fracturing in the process and being confined between the net and the slope, reaching the bottom in a controlled fall.
