6-3 obtain a monolithic structure. Care shall be taken to maintain a uniform surface on the bedding material. If the mattresses are to be placed underwater, they may be lac ed together, filled in the dry, and then placed in final position. If the mattresses are polyvinyl chloride coated, they shall no t be dragged, but shall be placed in a manner so as not to damage the coating. 601.052 Filter Fabric A filter fabric in accordance with Secti on 722.02 - Drainage Geotextile, shall be placed on the subgrade, backslope, and sid es of the excavation. If earthfill is to be placed over the gabions, filter fabric shall be placed top of the gabions before earthfill placement.
601.06 Filling Gabions and mattresses shall be filled in stri ct accordance with the
manufacturer’s recommendations, one copy of these recommendatio ns will be supplied to the Resident. Care shall be taken when placing stones inside gabions and mattresses in an effort to prevent distortion and ensure proper alignment. Care shall be taken when placing fill material to assure that the sheathing on coated units will not be broken or damaged. Gabions shall be filled in layers, 1 ft at a time. Two connec ting wires shall be placed between each layer in all cells along all exposed faces of the gabion structure. All connecting wires shall be looped around two mesh openings and t he wire terminals shall be securely twisted to prevent their loosening. The cells in any row shall be filled in stages so that local d eformation will be avoided. At no time shall any cell be filled to a depth exceed ing 1 ft more than the adjoining cell. Along all exposed gabion faces, the outer layer of stone shall be carefully placed and packed by hand to ensure proper alignment and a neat, compact, square appearance. No sharp edges of stone shall prot rude through the wire mesh. The last layer of stone shall be leveled with the top of the gabion or mattress to allow proper closing of the lid and provide an even surface for the next course. Gabions and mattresses shall be well packed and full without e xcessive bulging. 601.061 Filling of Hand Filled Gabions The assembled gabion u nits shall be placed in the proper location. A form shall then be placed along the front face and any side face not adjacent to an already placed gabion, and anchored to formwork on the back face to provide a rigid frame rectangle before filling with stone. The forms shall be sufficiently braced and tied to prevent dis tortion while the stones are being placed. 6-4 On all exposed gabion faces, the outer layer of stone shall be carefully placed and packed by hand to ensure proper alignment and a neat, compact, square appearance. No sharp edges of stone shall protrude through the wire mesh. Care shall be taken when placing fill material to assure that the sheathing on coated units will not be broken or damaged. Gabions shall be filled by hand in 1 ft layers. Two connectin g wires shall be placed between each layer in all cells along all exposed faces of the gabion structure. All connecting wires shall be looped around two mesh openings and t he wire terminals shall be securely twisted to prevent their loosening. The cells in any row shall be filled in stages so that local d eformation will be avoided. At no time shall any cell be filled to a depth exceed ing 1 ft more than the adjoining cell. The last layer of stone shall be leveled with the top of the g abion or mattress to allow proper closing of the lid and provide an even surface for the n ext course. At no time will any stones be placed by machine. Complete gabions shall have a maximum deviation from the desig nated shape of 1 inch in 3 ft. Gabions not meeting this tolerance will be empti ed, adjustments made, and refilled.
601.07 Lid Closing The lids shall be stretched tightly over t he filling, using
crowbars or lid closing tools, until the lid meets the perimete r edges of the front and end panels. The lid shall then be tightly laced along all edges, e nds, and diaphragms in the same manner as described above for assembly.
601.08 Cutting and Folding Mesh Where shown on the drawings o r when otherwise
directed, the mesh shall be cut , folded, and wired together to suit existing site conditions. The mesh must be cleanly cut and the surplus mesh cut out compl etely or folded back and neatly wired to an adjacent face. The cut edges of the mesh sh all be securely laced together with lacing wire in the manner as described above for assemblin g.
601.09 Method of Measurement Gabions and mattresses will be m easured for
payment by the cubic yard to the neat line dimensions shown on the plans.
601.10 Basis of Payment Payment for gabions and mattresses wi ll be made at the
contract unit price per cubic yard in place. Payment will be f ull compensation for excavating to place gabions and backfill material, for preparin g and fine grading the foundations area, for furnishing and placing backfill material under and behind the gabions and for furnishing and placing all necessary gabion units inclu ding wire mesh baskets, lacing wire, rock fill and all labor and equipment necessary to complete the work. 6-5 P a y I t e m P a y U n i t
601.21 Gabions, Galvanized C u b i c Y a r d
601.211 Gabions, Galvanized and Hand Filled Cubic Yard 601.22 Gabions, PVC Coated C u b i c Y a r d 601.221 Gabions, PVC Coated and Hand Filled Cubic Yard 601.23 Mattresses, Galvanized: ________ C u b i c Y a r d
601.24 Mattresses, PVC Coated: _______ C u b i c Y a r d
SECTION 602 - PIPE LINING Reserved SECTION 603 - PIPE CULVERTS AND STORM DRAINS
603.01 Description This work shall consist of constructing or reconstructing pipe
culverts and storm drains, in accordance with these specificati ons, the Standard Detail plans and in reasonably close conformity with the lines and grades sh own on the plans or established. The word "pipe" in these specifications shall include both rou nd pipe and pipe arches.
603.02 Materials Meet Sections:
J o i n t M o r t a r 705.02 F l e x i b l e G a s k e t s 705.03 F l e x i b l e C u l v e r t P o l y v i n y l c h l o r i d e ( P V C ) P i p e 706.08 Polypropylene Pipe 706.10 Corrugated Steel, Metallic Coated Pipe 707.02 Corrugated Aluminum Alloy Pipe & Pipe Arches 707.06 Polymer Precoated, Galvanized Corrugated Steel 707.07 Pipe & Pipe Arches Aluminum Coated (Type 2) Corrugated Steel Pipe 707.10 Zinc-Coated (Galvanized) Corrugated Steel Pipe 707.11 Rigid Culvert R e i n f o r c e d C o n c r e t e P i p e 706.02 C o r r u g a t e d P o l y e t h y l e n e P i p e 706.06