Filter Nets
 
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

S type

Mesh size

Unit weight

Dimensions in metres, FU installed

Resistance to current

Recommended granule size

FU empty

Height

Diameter

Surface
(m²)

Vol
(m³)

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
(m²)

Vol
(m³)

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.
 
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