Rock bag / Net bag for bag-type foot protection

Powerful Unit

  • Examination confirmation of harbor-related commercial technology, and business evaluation technology assessment No. 18002
New Technology Information System (NETIS) Registration Number:CBK-120003-VR

Outline

Bag material for sea and lakes where the effects of waves are a concern

Powerful Unit/ROCK BAG (NET GABION) is a bag material made by polyester fiber. Its net strength and excellent durability prevents wear and breakage of the net caused by the boulders and driftwood. It can be used as a revetment and a bridge pier foot protection work and an emergency flood control material.

Characteristics

  • All of the raw materials utilized are polyester fibers, there will be no degradation due to rusting.
  • Because of super-thick raschel netting, the bag material is resistant to rupture.
  • During installation, since the mouth closing part (knot part) does not protrude, the bag has a shape that avoids caught up by driftwood.
  • It has flexibility required for revetment foundation consolidation work, the bag shape is able to fit onto the landscape changes occurring in the bottom.In addition, the ability to fit into gaps is also maintained, which is necessary for filling work.
  • For the filling materials, locally generated materials (such as boulders, broken stones and rag stones) and concrete chunks can be used.
  • The netting mesh size is 50-75mm, which allows marine organisms easily pass in and out.

Application

Used as a slope protection material

After installation

After installation

Used as a temporary road (Viaduct on National road)

After installation

Binding type

Under development : Powerful unit for scouring prevention and foot revetment for Offshore wind power generation monopile foundations

Powerful UnitFor details

Standard / specification

Product No. and standard specification

Product No. 

(Mass)

FPU-10
(For 1t)
FPU-20
(For 2t)
FPU-30
(For 3t)
FPU-40
(For 4t)
FPU-60
(For 6t)
FPU-80
(For 8t)
FPU-120
(For 12t)
Approximate capacity(m³) 0.5 to 0.62 1.0 to 1.25 1.5 to 1.9 2.0 to 2.5 3.0 to 3.75 4.0 to 5.0 6.0 to 7.5
Dimensions W(mm) 1,800 2,250 2,600 2,850 4,000 4,000 4,500
H(mm) 1,600 2,150 2,400 2,650 2,700 3,000 3,300
Shape Single Net Bag
Netting Material Polyester raschel net (Black spun-dyed)
Composition(dtex) 1,670×80strands 1,670×128strands 1,670×230strands
Mesh spacing(mm) 75 50 50 70
Tensile strength(N/ strand) 2,700  or more 4,000  or more 7500 or more
Tensile strain(%) 30 or more, and 50 or less 20 or more, and 50 or less
Lifting rope※1 Tensile strength(kN) 12  or more 22  or more 46.7  or more
Tensile strain(%) 40 or less
Mouth binding rope Tensile strength(kN) 3.5  or more 12  or more
Tensile strain(%) 40 or less
Bottom binding rope Tensile strength(kN) 12 or more 22 or more
Tensile strain(%) 40 or less
Filling material Boulders, gravels, rubbles, concrete lumps
(Sizes from 100mm up to human head size), etc.

※Binding types are also available.

Completed shape reference table

Product No. (Mass) FPU-10
(For 1t)
FPU-20
(For 2t)
FPU-30
(For 3t)
FPU-40
(For 4t)
FPU-60
(For 6t)
FPU-80
(For 8t)
FPU-120
(For 12t)
Diameter(mm) 1,700 2,100 2,400 2,700 3,300 3,600 3,950
Height(mm) 550 700 750 900 950 950 1,250
Circumferential height(mm) 300 400 500 500 500 500 550

※ The completed shape dimensions described above are reference values in the case where the filling materials used are broken stones between 150 to 250mm in size. Because the stone size, specific gravity, and grain size will differ according to the site, the diameter and height will also change.

Additionally, in the case where the bags are placed in layers, because it can be expected that the heights in the table will become lower due to the weight and the method of placing the bags in layers, adjustments will be required at each site. 

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