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Gabion Specification (PVC)

TERRA AQUA

PVC COATED

GABION

Scope:

This specification data sheet covers the use of PVC coated steel double twisted hexagonal wire

mesh baskets filled with stone used for various applications including but not limited to

retaining walls, mechanically stabilized soil retaining structures, stream and river bank

protection, slope paving, outfall structures, weirs and drop structures etc...

Definition:

a) Gabions are defined as double twisted woven wire mesh box shaped baskets of

various sizes and dimensions.

b) The selvedges of the gabion baskets are the thicker perimeter and edge wires to

which the wire mesh is secured as to withstand sudden or gradual stress from any

direction.

c) Reinforcing wires are the thicker wires incorporated into the netting during

fabrication.

d) The diaphragms are internal wire mesh partitions which divide the gabions into cells.

e) Lacing or tie wire is the wire used to assemble and join the gabion units.

f) Connecting wires are the internal wires used to prevent the gabions from bulging.

g) Alternative fasteners are ASTM approved wire fasteners used in lieu of lacing wire.

Fabrication:

Double Twisted Hexagonal Steel Wire PVC Coated Mesh Gabions. Gabions shall be fabricated in

such a manner that the sides, ends, lid and diaphragms can be assembled at the construction

site into rectangular baskets of the sizes specified and shown in the drawings. Gabions shall be

of single unit construction: the base, lid, ends and sides shall be either woven into a single unit

or edge of these members connected to the base section of the gabion in such a manner that

strength and flexibility at the connecting point does not compromise the engineered structural

design of the gabion. Where the length of the gabion exceeds one and one half its horizontal

width, the gabion shall be divided by diaphragms of the same mesh and gauge as the body of

the gabion, into cells whose length does not exceed the horizontal width. The gabion shall be

furnished with the necessary diaphragms secured in proper position on the base in such a

manner that no additional tying is required at this juncture.

Summary of content (7 pages)

PAGE 1
TERRA AQUA PVC COATED GABION Scope: This specification data sheet covers the use of PVC coated steel double twisted hexagonal wire mesh baskets filled with stone used for various applications including but not limited to retaining walls, mechanically stabilized soil retaining structures, stream and river bank protection, slope paving, outfall structures, weirs and drop structures etc... Definition: a) Gabions are defined as double twisted woven wire mesh box shaped baskets of various sizes and dimensions.
PAGE 2
Mesh Formation: The double twisted hexagonal wire mesh shall have deformability sufficient to permit minimum of mesh elongation equivalent to 10% of the unstretched length of the mesh test section without reducing the gauge or the tensile strength of the individual wire strands to values less than those for similar wire, one gauge smaller in diameter. Non-Raveling: The wire mesh is to be fabricated in such a manner as to be non raveling.
PAGE 3
terra aqua gabion unit standard sizes: custom jumbo sizes available Gabion Unit Size 6x3x3 9x3x3 12x3x3 6x3x1.5 9x3x1.5 12x3x1.5 6x3x1 9x3x1 12x3x1 Capacity Cubic Yards 2 3 4 1 1.5 2 .666 1 1.33 No. Of Internal Cells 2 3 4 2 3 4 2 3 4 Tolerances: All gabion dimensions shall be within a tolerance limit of plus or minus 5% of the manufacturers stated dimensions.
PAGE 4
Material data: PVC coated galvanized steel wire: mesh opening 3 1/4 by 4 1/2 inches * diameter of mesh core wire: 0.1063 inches * diameter of mesh core wire plus PVC coating: 0.146 inches * diameter of selvedge core wire: 0.1338 inches * diameter of selvedge core wire plus PVC coating: 0.173 inches * diameter of lacing core wire: 0.091 inches * diameter of lacing core wire plus PVC coating: 0.
PAGE 5
B.3 Modulus of Elasticity: According to ASTM D-412; not less than 2700 psi at 100% strain. B.4 Resistance to Abrasion: According to ASTM 1242; weight loss < 12% ( Method B ) B.5 Brittleness Temperature: According to ASTM D-746, Procedure A ; shall be at least 8.3 degrees centigrade below the minimum temperature at which the gabions will be handled or placed but not higher than -9.4 degrees centigrade. B.6 Hardness: According to ASTM D-2240; shall be between 50 and 60 Shore D when tested. B.
PAGE 6
After the above tests have been performed, the PVC compound shall exhibit the following properties. D. Properties after aging tests: D.1 Appearance: The vinyl coating shall not crack , blister or split and shall not show any remarkable change in color. D.2 Specific Gravity: Shall not show change of higher than 6% of it initial value. D.3 Durometer Hardness: Shall not show change higher than 10% of its initial value. D.4 Tensile strength: Shall not show change higher than 25% of its initial value. D.
PAGE 7
36” GABIONS & 18” GABIONS FOR VERTICAL STRUCTURES ON THE EXPOSED FACE I) Gabions shall be filled to a depth of twelve (12) inches. II) For end units, two connecting wire preformed TACT Tie wires in each direction shall be tightly tied to opposite faces of the end gabion cell at a height of twelve (12) inches above the base. Internal compartments shall have internal connecting wires connecting front to back face of the gabion. Preformed TACT Ties are placed diagonal in the gabion cell.