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ConstructionSpecification—WireMeshGabionsandMattresses
NRCS - 764- PAGE 6
AL - EWP -
Construction Specification 764—Wire Mesh Gabions
1. Scope
The work consists of furnishing, assembling, and installing rock filled wire mesh gabion baskets as shown on the drawings.
2. Material
Gabions shall be fabricated, assembled, and installed in accordance with the nominal wire sizes and dimensions shown in Tables 764–1, using the following materials unless otherwise specified in Section 7.
Table 764–1 Minimum requirements*
Gabion baskets—height 12, 18, or 36 inches; length as specified
Type of wire Mesh Wire PVC Total Galvanized size diameter coating diameter coating (in) ???(in) ???(in) ???(in) ?oz./ft2
Woven mesh 3.25 x 4.5 0.118 None 0.118 0.80
3.25 x 4.5 0.105 0.02 0.145 0.80
Selvage 0.153 None 0.153 0.80
0.132 0.02 0.172 0.80
Lacing and internal 0.086 0.02 0.126 0.70
connecting wire
Welded 3 x 3 0.118 None 0.118 0.80
Mesh 3 x 3 0.105 0.02 0.145 0.80
Spiral binder 0.105 0.02 0.145 0.80
*Note: The wire sizes and PVC coating thickness shown are nominal sizes. The wire sizes include the galvanizing coating thickness.
Wire for fabrication and assembly shall be hot-dipped galvanized. The wire shall have a minimum tensile strength of 60,000 pounds per square inch. Galvanized steel wire shall conform to ASTM A 641, class 3, soft temper.
When epoxy or polyvinyl chloride (PVC) coated wire is specified in section 7, the galvanized wire shall be coated by fusion bonded epoxy; fusion bonded, extruded; or extruded and bonded PVC material. The wire coating shall be black, gray, green, or silvery, and the initial properties of the PVC coating shall meet the following requirements:
a. Specific gravity. In the range of 1.30 to 1.40, ASTM D 792.
b. Abrasion resistance. The percentage of weight loss shall be less than 12 percent when tested according to ASTM D 1242, method B, at 200 cycles, CSI-A abrader tape, 80 grit.
c. Brittleness temperature. Not higher than 15 °F, ASTM D 746.
d. Tensile strength. Extruded coating (not les
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