700 Page 477700 RIPRAP
700.1DESCRIPTION
This work consists of furnishing and placing approved material for the protection of piers, abutments, walls, embankments, and other designated locations.
700.2MATERIALS
A.Riprap: Riprap will conform to Section 830. B.Drainage Fabric: Drainage fabric will conform to Section 831, Type B.
700.3CONSTRUCTION REQUIREMENTS
Slopes to be protected by riprap will be free of brush, trees, stumps, and other objectionable material and will be dressed to a smooth surface. Soft or spongy material will be removed to the specified depth and replaced with approved material. Filled areas will be thoroughly compacted. All excavation required to construct the slope to the configuration detailed in the plans will be incidental to the payment for riprap. When drainage fabric is specified on the plans, the surface to be covered will be smooth, free of obstructions, and will conform to plan shown dimensions prior to placement of the drainage fabric. The drainage fabric will be placed under and along all sides of the riprap that are in contact with earth, unless otherwise shown on the plans. Lapped joints in the drainage fabric will be placed transverse to the direction of flow with the overlap in the direction of flow. All lapped joints will be lapped a minimum of 1 foot. Vehicles and equipment will not be operated directly on the drainage fabric. Protection for structure foundations will be provided as early as the foundation construction permits. The area to be protected will be cleaned of waste materials. Riprap will be placed in a manner which will produce a reasonably well graded mass of stone with the minimum practicable percentage of voids. Riprap will be placed to its full course thickness in one operation without displacing the underlying material. Bridge berms, channel slopes/bottoms, and other surfaces that will be covered with riprap will be finished to an elevation that will permit the placement of the required depth of riprap and match plan elevations or existing channels. Placing of riprap in layers, or by dumping into chutes, or similar methods likely to cause segregation will not be permitted. The larger stones will be well distributed and the entire mass of stone will conform to the gradation specified. In order to produce a compact riprap protection in which all sizes of material are placed in their proper proportions, hand placing or rearranging of individual stones by mechanical equipment may be required. The riprap protection will be placed in conjunction with the construction of the embankment. To prevent mixture of embankment and riprap, sufficient lag in construction of the riprap may be necessary. The Contractor will maintain the riprap protection until accepted. Material displaced by any cause will be replaced. 700 Page 478700.4 METHOD OF MEASUREMENT A.Riprap: Riprap will be measured to the nearest 0.1 ton. B.Drainage Fabric: Drainage fabric will be measured to the nearest square yard. The lap at joints will not be included in the measurement.
700.5BASIS OF PAYMENT
A.Riprap: Riprap will be paid for at the contract unit price per ton of material furnished. Payment will be full compensation for furnishing, loading, hauling, placing, and spreading the stone, and for labor, and equipment required for shaping, excavating, and performing underwater operations necessary. B.Drainage Fabric: Drainage fabric will be paid for at the contract unit price per square yard. Payment will be full compensation for furnishing and installing the drainage fabric as specified. Payment will be for plan quantity unless changes are ordered in writing. 720 Page 479720 BANK AND CHANNEL PROTECTION GABIONS
720.1DESCRIPTION
This work consists of furnishing, assembling and filling woven wire gabions with stones as specified in the contract in conformance with the dimensions, lines, and grades shown on the plans or established by the Engineer.
720.2MATERIALS
Materials will conform to the following requirements and Sections. A.Stone: The stone will be durable stone or ledge rock, free of seams, cracks, and defects. Slabby stone pieces will not be acceptable. The stone will range in size from a minimum of 4 inches to a maximum of 8 inches in the greatest dimension. The majority of the stones will be in the 5 to 6 inch range and cubical or rounded in shape. Stone will not have an L.A. Abrasion of more than 40%. B.Gabions: Gabions will conform to the plans and Section 1030 . C.PVC Coating: When specified, the wire used in the fabrication of the bank and channel protection will be PVC coated. After zinc coating, the PVC coating will be extrusion bonded on the wire. The PVC coating will have a nominal thickness of 0.02165 inches and a minimum thickness of 0.015 inches. The lacing wire will also be PVC coated. The PVC coating will not crack, peel, blister, split, or have any other defects. The coating material will be resistant to the effects of weather and exposure to ultraviolet rays. D.Drainage Fabric: Drainage fabric will conform to Section 831, Type B. E.Lacing and Internal Connecting Wire: Lacing and internal connecting wire will be 0.0866 inch diameter steel wire ASTM A641 Class 3 soft temper measured after galvanizing and for PVC coated baskets will be 0.0866 inch diameter steel wire measured after galvanizing but before PVC coating. F.Interlocking Fasteners: Interlocking fasteners will conform to Section 1030 .
720.3CONSTRUCTION REQUIREMENTS
Slopes to be protected by gabions will be free of brush, trees, stumps and other objectionable material and will be dressed to a smooth surface. Soft or spongy material will be removed to the specified depth and replaced with suitable material. Filled areas will be thoroughly compacted. The bank and channel protection will be assembled individually by erecting the sides, ends and diaphragm(s) with all creases in the correct position and the top of all sides satisfactorily level. Lacing wire, fasteners, or both will be used to assemble the units and to join the units together. A.Lacing: The lacing procedure is as follows: 1.Cut a length of lacing wire approximately 1½ times the distance to be laced but not exceeding 5 feet.