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Fabric Formwork Installation Details
The concrete matt is formed by pump filling a sand: cement micro concrete into two layer Filter Point Mattress.The woven porous filters allow for efficent use in tidal conditions.
Standard Mattress FP150. Max thickness 150 mm average thickness 100 mm, other mattress thicknesses are available.
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Wave Protection
FP Matts can be used efficiently against wave action where the porosity of the mattress is greater than that of the revetment material. This is the case for sands, silts and clays.
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Current Protection
FP150 mattress is accepted for current scour flows of up to 5 m/s. Thicker matts can be used to give enhanced protection for greater flow speeds.
Mattress Construction
Mattress pannels are sewn together to form larger matts. Zips are sewn in place to connect the sides of adjacent matts.
Mattress Installation
Mattress is laid out in position by divers where underwater and the top of the sloping mattress is restrained. Pump filling generally commences from the bottom upwards.Matt fabric weighs 0.5 kg/mē enabling matts of arround 50 -100 mē to be easily handled.
When matts are filled underwater a 4 man dive team can install arround 200 - 300 mē in a day. When installed in the dry, rates of up to 500 mē can be achived, with a 4 man team, in a single day.
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Bed Preparation
A significant advantage with using mattress is that there is no need for accurate bed preperation, unlike many other revetment systems. This is because the matt will follow the profile of the bed. However it is important to secure the edges of the mattress well, particularly at the toe of banks.
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