Rock bag / Net bag for bag-type foot protection
Bottle Unit
- Naturnaher Wasserbau (Near-natural river engineering) product
- Construction technology examination certificate report No. 0109
- MLIT issued “Bag type bag material for foot protection performance regulation (long-term performance type)” compliant product
- “Rubble Net Layered Construction Method” Design and Construction Manual Performance certificate qualified product (certificate No. 1506)
- Conformity product of Disaster recovery basic policy to protect beautiful mountains and rivers
- CE marking
New Technology Information System (NETIS) Registration Number： KT-000028-VE
Outline
Rock bag material for foot protection method, fitting landscape changes occurring in the river bottom and fits to unevenness and gaps.
The Bottle Unit／ROCK BAG（NET GABION） is a double-layer raschel net structure bag material made by polyester fibers. It can be used with filling materials such as boulders, gravels, rubbles and concrete lumps that can be sourced at site. The bag has the soft adequate shape to follow changes in the river bottom, which is required for the revetment foundation consolidation work, and also the ability to fit into gaps, which is required for space filling work.
According to the amounts of filling materials, selection can be made from four types of bags containing 1, 2, 3 and 4t.
Filling bag procedure
Characteristics
- During installation, the mouth closing part (knot part) does not protrude, so that when installed in rivers the bag shape will not easily become caught up by flotsam.
- The bags have outstanding weather resistance, chemical resistance, resistance to cold and heat, and shock resistance.
- Due to the double structure net and the 25mm mesh spacing, even if ruptures occur in a number of locations, the structure will prevent the filling materials from escaping.
- Because mechanical installation is mainly used both in the filling work and in the placement work, it will be possible to shorten the construction period.
- By using underwater lifting jigs, underwater installation will also be simple.
3t bag
Mouth closing part
Application
- Revetment, bridge pier foot protection work and river bed protection work
- Temporary road foundation construction work
- Space filling work for foot protection blocks
- Revetment, bridge pier foot protection work and scouring prevention
- Foot protection work in offshore wind farms
Standard / specification
Standards/product No.
| Type | For 1t FBU-10(S) |
For 2t FBU-20(S) |
For 3t FBU-30(S) |
For 4t FBU-40(S) |
|
|---|---|---|---|---|---|
| Specification | Standard(W×H)(mm) | 2500×1500 | 2800×2100 | 3400×2200 | 3400×2600 |
| Shape | Bag double ply | ||||
| Netting | FBU-10(S)，FBU-20(S)，FBU-30(S)，FBU-40(S)： Polyester Raschel net(Black spun-dyed) |
||||
| Composition | 1670dtex※4 ×10 strands | 1670dtex※4 ×15 strands | |||
| Mesh spacing(mm) | 25 | ||||
| Mouth Closing rope | Polyester (Black spun-dyed): ø 6mm | ||||
|
Lifting rope (6 points anchoring) |
Polyester (Black spun-dyed): ø 9mm | Polyester (Black spun-dyed) :ø 12mm | |||
| Base Binding rope | Polyester (Black spun-dyed) :ø 9mm | ||||
| Strength characteristics | Netting | Tensile strength※2 450N(Approx.45 kgf)/strands or more Tensile strain:25% or more , and 40% or less |
Tensile strength※2 650N(Approx.65 kgf)/strands or more Tensile strain:25% or more , and 40% or less |
||
| Mouth Closing rope |
Polyester : ø 6mm |
||||
|
Lifting rope (6 points anchoring) |
Polyester : ø 9mm Tensile strength※3 12kN(Approx.1.2 tf) or more Tensile strain:40% or less |
Polyester : ø 12mm Tensile strength※3 22kN(Approx.2.2 tf) or more Tensile strain:40% or less |
|||
| Base Binding rope | Polyester : ø 9mm Tensile strength※3 12kN(Approx.1.2 tf) or more Tensile strain:40％ or less |
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| Usage | Filling material | Boulders, gravels, rubbles, concrete lumps (Sizes from 50mm up to human head size), etc. |
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| Approximate capacity(m3) | Approx. 0.62 | Approx. 1.25 | Approx. 1.9 | Approx. 2.5 | |
| Mass(t) | Approx. 1※6 | Approx. 2※6 | Approx. 3※6 | Approx. 4※6 | |
※1: Black spun-dyed yarn: Kneading carbon black material into raw material, spin, extend and make the yarn.
※2: Tensile strength: conforming to JIS A 8960
※3: Tensile strength: conforming to JIS L 2707
※4:”dtex” is an unit shows the size of yarn by expressed by its mass in gram(g) per 10000m
※5: Bag material will be easier to break if using over-sized filling material
※6: Above showed number indicates the referential mass when filling standard sized stone (rubble of diameter 50 to human head-size) . If using broken concrete blocks as filling material, specific gravity is lighter and may not have the same mass rate.
Completed shape reference table
| Type | For 1t FBU-10(S) |
For 2t FBU-20(S) |
For 3t FBU-30(S) |
For 4t FBU-40(S) |
|---|---|---|---|---|
| Diameter（mm） | 1,700 | 2,100 | 2,400 | 2,700 |
| Height（mm） | 550 | 700 | 750 | 900 |
| Circumferential height（mm） | 300 | 400 | 500 | 500 |
※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.
Construction example
Related catalog download
Related products / construction methods
disaster recovery / Foot protection / maintenance road / net gabion / ocean / river / Rock bag / Solar power generation / wind power generation