Geoweb Slope and Channel Protection
1. Product Description
Geoweb® geocells are excellent tools for the control of erosion. The Geoweb system can be placed on a slope or in a channel and then infilled with a variety of erosion protection fills, such as topsoil, gravel, crushed rock, or even concrete. The 3-dimensional Geoweb structure holds the upper soil layer in place on the slope and prevents washout from water action or other erosive forces. In sandy soils, subject to wind erosion, the Geoweb system helps retain soils until vegetation has a chance to establish itself. On steeper slopes, the Geoweb system can help to hold embankment soils in place where it would normally slide down the slope. The system is an excellent cover for geomembrane liners on slopes. Optional accessories available with the Geoweb system include, tendons for anchorage at the crest and over liners, ATRA® anchors for staking the Geoweb on slopes, ATRA® Keys to connect Geoweb sections together and erosion blankets (for vegetated solutions). Project specific evaluations are available for product recommendation and design.
2. Technical Data
Materials information is on page 2.
3. Installation
There are multiple methods of installing Geoweb which will depend mainly on the application. The two primary anchorage methods when installing Geoweb on a slope are Atra Anchors (stakes) and /or tendons connected to a deadman pipe at the crest. When using Atra anchors (typically GFRP rods or 10M rebar with a special Atra Clip on top), precut the anchors to the design length and push them into the slope at 90 degrees to the slope at the required spacing. The installation can be accomplished using sledge hammers or with the Hilti Atra® Driver System. (The Hilti Atra® Driver System can increase productivity by up to 400%). When using tendons, the tendons are pre-threaded through the pre-cut slots in the Geoweb and knotted at Atra Clips within the Geoweb cells at specified intervals down the slope. The Geoweb cells are then filled with the designated backfill (topsoil, gravel, or concrete) and may be covered with an erosion blanket.
4. Availability and Cost Available from Layfield or distributors. Call
425-254-1075 Pacific time
780-453-6731 Mountain time, or
905-761-9123 Eastern time
5. Manufactured for
Layfield Environmental Systems Corp.
Layfield Geosynthetics & Ind. Fabrics Ltd.
6. Warranty
Products sold will meet Layfield's published specifications at time of sale. Full warranty details are available from Layfield.
7. Maintenance
Geoweb Slope and Channel protection should be inspected regularly or at least annually and after all severe storms. Look for erosion of backfill and settlement. Vegetated applications should be inspected more frequently until vegetation is well established. Repair any damaged areas and reseed for vegetated applications.
8. Filing Systems
www.LayfieldGroup.com
www.geomembranes.com
9. Geoweb Material Properties
| 6 Dec 2011 |
Geoweb Material Properties |
| Cell Size |
Units |
GW20V |
GW30V |
GW40V |
|
Material Thickness |
mil /mm |
50 /1.27 |
50 /1.27 |
50 /1.27 |
| Polymer Density (ASTM D 1505) |
lbs/ft3
g/cm3 |
58.4 -60.2
0.935 - 0.965 |
58.4- 60.2
0.935 - 0.965 |
58.4-60.2
0.935 - 0.965 |
| Nominal Dimension (one cell) |
in
mm |
8.8 x 10.2
224 x 259 |
11.3 x 12.6
287 x 320 |
18.7 x 20.0
475 x 508 |
| Section Length (min to max) |
ft
m |
12.0 to 27.3
3.7 to 8.3 |
15.4 to 35.1
4.7 to 10.7 |
25.4 to 58.2
7.7 to 17.8 |
| Section Width (min to max) |
ft
m |
7.7 to 9.2
2.3 to 2.8 |
| Connection Material |
|
Polyethylene ATRA Key |
| Carbon Black Content |
% |
1.5 - 2 by weight |
|
Min. ESCR (ASTM 1693) |
hr |
5000 |
| Note: All styles available in 3 in, 4in, 6in and 8in depths. ATRA Anchors and Geosynthetic tendons are also available. Contact Layfield for details. |
| 6 Dec 2011 |
Geoweb Seam Properties |
| Cell Height |
Units |
3" |
4" |
6" |
8" |
| Minimum Seam Strength |
lb/N |
240/1060 |
320/1420 |
480/2130 |
640/2840 |
Geoweb and ATRA are registered trademarks of Presto Products Company
10. Geoweb Accessories
| 23 Dec 2011 |
Geoweb Accessories - Material Properties |
| Product |
Material |
Nominal Diameter |
Break Strength |
|
Tendons |
| TP-31 |
PET1 |
13 mm |
3.11 kN |
| TP-67 |
PET |
16 mm |
6.70 kN |
| TP-93 |
PET |
19 mm |
9.30 kN |
| TK-89 |
Kevlar Aramid |
10 mm |
8.9 kN |
| TK-133 |
Kevlar Aramid |
16 mm |
13.34 kN |
| TK-178 |
Kevlar Aramid |
19 mm |
17.8 kN |
| Other Materials |
| Atra Key |
Polyethylene |
-- |
-- |
| Atra Anchors2 |
GFRP |
12.7 mm |
655 Mpa |
| Atra Clips |
Polyethylene |
25 mm |
-- |
|
1 PET = Polyester, all PET and Kevlar tendons above are woven material
2GFRP Anchor (Stake) Break strength shown is compressive strength as per ASTM D638. All other strengths shown above are tensile. GFRP Atra Anchors are supplied assembled complete with AtraClip inserted on GFRP rod |