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| Curtains deployed in
port expansion dredging and reclamation. Skirt
depths on this application ranged from tapered
contours for shores up to 12m deep. |
Curtain skirts are
furled to float assemblies to make deployment
easier. Curtains are deployed and anchored in
position then the skirts are dropped.
Permanent furling lines may be installed if
required at additional cost. |
Float assemblies are
joined using ASTM 962 pattern universal boom
connectors. This transfers the load from one float
segment to the next and allows our curtains to be
attached to oil containment booms, sliding tidal
compensators |
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| Bucket dredge frame
fabricated for dredging of contaminated materials.
frames are configured from HDPE pipe and may be
broken down for transportation. Skirt lift winches
may be fitted if required. |
Freeing ports
incorporated in dredge frame curtain to compensate
for bucket vacuum. The size and number of freeing
ports are determined by bucket size winch speed |
Freeing ports fitted
with weighted flaps which open to allow water in
but close to prevent sediment escaping from
contained area. Ports are supported by mesh
inserts to maintain shape of opening. |
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| Type II curtain
floats are fabricated from 630gsm PVC with
reinforcing webbing above and below floats. The
webbing under the float is joined from one segment
to the next using a SS D ring and shackle |
Type III curtains are
fabricated from 900gsm PVC have an additional
tension wire as well as webbing. depending on
application a flap and becket joining system is
utilised to prevent leakage |
HDP Curtains have
rotationally moulded PE floats in addition to
webbing and wire rope reinforcement. HDP curtains
are usually installed in permanent locations. |
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| TII contractors 2m
curtain used to control sediment during foreshore
reconstruction |
floating bridge mat
consists o0f two float assemblies with a float
supported geo-fabric to catch lead paint fragments
and other debris from bridge repair. In this case
the bridge was demolished and dropped into the mat
and lifted out by floating crane |
500m curtain
delivered in continuous length with furled skirt
for immediate deployment. curtains are available
fin segment lengths from 15 to 30m. |
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| Double curtain
deployed around wharf demolition, contaminated
site. Skirt configured from a heavy woven fabric
to allow sediment to hit and fall rather than
being entrained in skirt. |
Curtain deployed for
seawall remediation in river with high flow and
heavy ferry traffic. This curtain is fitted with a
100kN woven polyester skirt |
All curtains seamed
using twin needle lock stitch (Adler 221) #346
bonded polyester. Webbing tension members attached
using four rows of stitching at 3SPI |
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| 110m pre-assembled
silt curtain pack. Type II SC125 fitted with 2.5m
geotex N/Woven skirt with 0.5m flow through
mesh panel between floats and skirt |
110m
pre-assembled silt curtain pack. Type II SC125
fitted with 3m geotex N/Woven skirt and mesh flow
through float assembly |
110m +
40m pre-assembled silt curtain pack. Mooring posts
and hardware. Curtain configuration 1.5m geotex
N/Woven skirt |
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| The
effectiveness of a properly designed and deployed
curtain cannot be underestimated. In this
application a model SC125 with a 2m geotex 701
non-woven polypropylene skirt has been deployed in
a tidal waterway. The seabed is irregular rocks
covered with oysters over which the factory fitted
chain ballast provides a sea. As the tide ebbs the
load against the skirt increases but the curtain
continues to contain the suspended solids. |
