626GABIONS

626.1DESCRIPTION—This work is the furnishing, assembling, filling, and placing of open mesh wire baskets

with aggregate, forming gabions of the type indicated.

626.2MATERIAL—

Gabion Height Minimum Aggregate Size* Maximum Aggregate Size* Less than 1 foot 3 inches 5 inches 1 foot or over 4 inches 8 inches * Measure longest side.

of the following:

• ASTM A974, Standard Specification for Welded Wire Mesh Fabric Gabions and Gabion Mattresses (Metallic-Coated or Polyvinyl Chloride (PVC) Coated), Zinc Coated

OR

• ASTM A975, Standard Specification for Double -Twisted Hexagonal Mesh Gabions and Revet Mattresses (Metallic-Coated Steel Wire or Metallic-Coated Steel Wire with Polyvinyl Chloride (PVC) Coating), Zinc Coated

to the following:

• ASTM A974, Standard Specification for Welded Wire Mesh Fabric Gabions and Gabion Mattresses (Metallic-Coated or Polyvinyl Chloride (PVC) Coated), Zinc Coated and overcoated with PVC .

OR

• ASTM A975, Standard Specification for Double -Twisted Hexagonal Mesh Gabions and Revet Mattresses (Metallic-Coated Steel Wire or Metallic-Coated Steel Wire with Polyvinyl Chloride (PVC) Coating), Zinc Coated and overcoated with PVC.

of material arriving at the job site at approximately the same time.

626.3CONSTRUCTION—As shown on the Standard Drawings, as indicated, and as follows:

replace with acceptable material. Scarify depressions and add acceptable material. Thoroughly compact entire gabion area and finish to a firm, even surface, free of vegetation, large stones, and other debris. Dispose of unsuitable or excess material.

212. For retaining walls, drape Class 4, Type A geotextile over surface of gabions to receive backfill without stretching as indicated.

1.a Woven Wire Gabion. Unfold and assemble woven wire gabion basket using interlocking fasteners or continuous tie wire lacing. Overlap ends of tie wire lacing equal to two loop coils to start next length of tie wire.

1.b Welded Wire Gabion. Unfold and assemble welded wire gabion basket using temporary or spiral fasteners. Place spiral fasteners and secure as indicated.

assembled gabion baskets using the type and number of fasteners or tie wire lacing indicated. Maintain shape and alignment of gabion baskets using standard fence stretcher, chain fall , or iron bar. Place cross ties as shown on Standard Drawings. Do not damage corrosion resistant wire mesh or fixtures. Fill Type A gabions by hand with coarse aggregate along all exposed faces for a uniform appearance. Fill Type B gabions by hand placement or use small power equipment to place coarse aggregate. Overfill gabion baskets approximately 1 1/2 inches and fasten lid to diaphragms, sides, and ends of gabion basket using tie wire lacing. When stacking of gabions is indicated, offset ends of individual gabion baskets from ends of gabion baskets on underlying course. Adjust size of gabion basket to provide offset.

shown on the plans. Place backfill material for each course of gabion baskets and compact before starting succeeding course. In areas inaccessible to self-propelled compaction equipment, place material in uniform loose layers of 4 inches maximum depth and compact using mechanical vibration tampers.

directed by the Representative. This includes broken wires, missing or damaged coatings, broken or cracked welds, or other damage resulting from installation of the gabions. Construc t gabions so that faces have a smooth, uniform appearance and are positioned at the proper lines, grades, and batter. Remove and replace gabions deemed unacceptable by the Representative.

626.4MEASUREMENT AND PAYMENT—Cubic Yard