Kyowa Co. Ltd founded in 1969 is the leading company in the Japanese market for mesh sheets and safety nets for industry and construction. The Filter Unit was used for the first time in 1987 to protect the foundations for the great bridge at Akashi, the World’s longest span with a total length of 3,911 metres. For more than 20 years the Filter Unit has been widely used in civil engineering for rivers and coastal works.
Over 17,000 reference sites in Japan with over 800,000 Filter Units installed.
- 1995, 1998, 2000 & 2004 Certificate of Technical Testing awarded by the
Public Works Research Institute (Japanese national testing body) - 2004 Kyowa Co. Ltd achieves ISO 14001 certification
- 2004 the Ecogreen type is awarded “Ecomark” label
- Since 1996 Filter Units have been part of the equipment used by the
Japanese Civil Defence forces - 2008 Filter Unit achieves CE labelling for 7 types of products
- 2011 Filter Unit achieves CE labelling for 4 types of product
Main Advantages:
Hydraulics
Adapts perfectly to all soils for highly efficient coverage and absorption of energy.
Ecology
Supports natural vegetation and encourages the development fauna and flora.
Installation
Due to the speed of execution and reduction in labour costs as the products are highly flexible.
Applications
Foot of Bank protection
Bridge foundations
Quay wall foot protection
Emergency measures
Temporary installations
Beach erosion protection
Technical Characteristics:
The Filter Unit is made of polyester and ideal for all hydraulic works as it is non-corrosive, rot-proof, non-rusting and weather resistant. The suppleness and flexibility of the fibre makes it adaptable to all soils and reliefs.
Product characteristics |
|
S type |
Recycled polyester |
Ecogreen type |
Recycled polyester |
The Filter Unit is used for all types of Strengthening and separation works;
- Roads and other trafficked areas EN13249
- Railways EN13250
- Earthworks, foundations and retaining structures EN13251
- Erosion control works (coastal protection and bank revetments) EN13253
- Reservoirs and dams EN13254
- Canals EN13255
- Tunnels and underground structurs EN13256
- Solid waste disposals EN13257
Filter Units characteristics allow it to be in situ over extended periods in a variety of contexts;
Immersed in saline environments
Specific environments such as; Alkaline and Acidic soils as well as regions of both high and low temperature
S type for maritime applications ( 8 tonnes).
Specifically adapted to extreme conditions and to marine environments with double weaving and a restraint rope which assists in reducing rubbing from the contents and thus wear to the net by around 30%.
Technical specification |
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S type |
Mesh size |
Unit weight |
Dimensions in metres, FU installed |
Resistance to current |
Recommended granule size |
||||
FU empty |
Height |
Diameter |
Surface |
Vol |
Unit |
Grouped |
|||
8 tonnes |
50mm |
40kg |
0.7 |
3 |
7 |
5 |
3.9m/s |
5.9m/s |
75 – 200mm |
Ecogreen type (green) for all applications (1, 2 and 4 tonnes)
The Ecogreen Filter Unit is a double net in moss-green polyester which intergrates perfectly into a natural setting and along watercourses. The unique flexibility of the Ecogreen Filter Unit together with its ease of use enables it to marry up perfectly into any type of space where construction is required particularly since the gaps provided by its filler material encourages the creation of ecosystems and rapid re-growth of vegetation.
An ecological product manufactured using recycled plastic bottles, the Ecogreen Filter Unit has achieved the “Ecogreen” ecological labelling awarded to products acknowledged as being useful in protecting the environment by the Japanese Environment Association.
Technical specification |
|||||||||
Ecogreen |
Mesh size |
Unit weight |
Dimensions in metres, FU installed |
Resistance to current |
Recommended granule size |
||||
FU empty |
Height |
Diameter |
Surface |
Vol |
Unit |
Grouped |
|||
1 tonnes |
25mm |
4.5kg |
0.35 |
1.5 |
1.77 |
0.62 |
2.8m/s |
4.2m/s |
50 – 200mm |
2 tonnes |
25mm |
6kg |
0.4 |
1.9 |
2.8 |
1.24 |
3.1m/s |
4.7m/s |
|
4 tonnes |
25mm |
13kg |
0.6 |
2.4 |
4.5 |
2.5 |
3.5 m/s |
5.3m/s |
|
Method of execution
The Filter Units are filled in a caisson using any type of solid material; stones, pebbles, rubble, crushed concrete etc.
The procedure for filling is as follows;
- install the Filter Unit in the caisson
- Fill with material
- Close up the Filter Unit and attach the ring
- Lift off the caisson
- Lift the Filter Unit using the ring and place in position
Filter Units can be installed easily and quickly thus reducing costs.
Accessories
Ring
Each Fliter Unit is supplied with a forged iron ring which connects the 6 fastening points of the net lifting rope. This ring ensures that the Unit is extremely easy to place in position and also makes it possible to link nets together using a rope.
Caisson
The Filter Unit are filled using a caisson (to be constructed by the client).
This pre-dimensioned caission serves as a filling measure.
Evans Piling is the UK distributor for Kyowa Filter Units.
For product brochure please click here.